POI 百万数据导出

标签：test   ica   sts   nal   名称   private   正则   date()   exp   

poi 导出主类

package test;

import java.io.File;
import java.io.FileOutputStream;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.streaming.SXSSFSheet;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;

public class ExcelExportSXXSSF {

    // 定义工作表
    private SXSSFWorkbook wb;

    /**
     * 定义工作表中的sheet
     */
    private Sheet sh;   /**
     * 定义保存在内存中的数量,-1表示手动控制
     */
    private int flushRows;
    /** 导出文件行数 */
    private int rownum;
    /** 导出文件列数 */
    private int colnum;

    /** 导出文件的存放路径 */
    private String filePath;
    /** 下载导出文件的路径 */
    private String fileWebPath;
    /**文件名称前缀*/
    private String filePrefix;
    /**导出文件全路径*/
    private String fileAllPath;
    /** 导出文件列标题 */
    private List<String> fieldNames;
    /**导出文件每列代码，用于反射获取对象属性值*/
    private List<String> fieldCodes;

    private ExcelExportSXXSSF() {

    }

    /**
     * 开始导出方法
     * 
     * @param filePath
     *            导出文件存放物理路径
     * @param fileWebPath
     *            导出文件web下载路径
     * @param filePrefix
     *            导出文件名的前缀          
     * @param flushRows
     *            存放在内存的数据量
     * @param fieldNames
     *            导出文件列标题
     * @param fieldCodes
     *            导出数据对象的字段名称     
     * @param flushRows
     *          写磁盘控制参数
     * @return
     */
    public static ExcelExportSXXSSF start(String filePath, String fileWebPath,String filePrefix,
            List<String> fieldNames,List<String> fieldCodes, int flushRows) throws Exception {
        ExcelExportSXXSSF excelExportSXXSSF = new ExcelExportSXXSSF();
        excelExportSXXSSF.setFilePath(filePath);
        excelExportSXXSSF.setFileWebPath(fileWebPath);
        excelExportSXXSSF.setFilePrefix(filePrefix);
        excelExportSXXSSF.setFieldNames(fieldNames);
        excelExportSXXSSF.setFieldCodes(fieldCodes);
        excelExportSXXSSF.setWb(new SXSSFWorkbook(flushRows));//创建workbook
        excelExportSXXSSF.setSh(excelExportSXXSSF.getWb().createSheet());//创建sheet
        excelExportSXXSSF.writeTitles();
        return excelExportSXXSSF;
    }

    /**
     * 设置导入文件的标题
     * 开始生成导出excel的标题
     * @throws Exception
     */
    private void writeTitles() throws Exception {
        rownum = 0;//第0行
        colnum = fieldNames.size();//根据列标题得出列数
        Row row = sh.createRow(rownum);
        for (int cellnum = 0; cellnum < colnum; cellnum++) {
            Cell cell = row.createCell(cellnum);
            cell.setCellValue(fieldNames.get(cellnum));
        }
    }

    /**
     * 向导出文件写数据
     * 
     * @param datalist
     *            存放Object对象，仅支持单个自定义对象，不支持对象中嵌套自定义对象
     * @return
     */
    public void writeDatasByObject(List datalist) throws Exception {

        for (int j = 0; j < datalist.size(); j++) {
            rownum = rownum + 1;
            Row row = sh.createRow(rownum);
            for (int cellnum = 0; cellnum < fieldCodes.size(); cellnum++) {
                Object owner = datalist.get(j);
                Object value = invokeMethod(owner, fieldCodes.get(cellnum),
                        new Object[] {});
                Cell cell = row.createCell(cellnum);
                cell.setCellValue(value!=null?value.toString():"");
            }

        }

    }
    /**
     * 向导出文件写数据
     * 
     * @param datalist
     *            存放字符串数组
     * @return
     */
    public void writeDatasByString(List<String> datalist) throws Exception {
            rownum = rownum + 1;
            Row row = sh.createRow(rownum);
            int datalist_size = datalist.size();
            for (int cellnum = 0; cellnum < colnum; cellnum++) {
                Cell cell = row.createCell(cellnum);
                if(datalist_size>cellnum){
                    cell.setCellValue(datalist.get(cellnum));
                }else{
                    cell.setCellValue("");
                }
                
            }
    }

    /**
     * 手动刷新方法,如果flushRows为-1则需要使用此方法手动刷新内存
     * 
     * @param flushRows
     * @throws Exception
     */
    public void flush(int flushNum) throws Exception {
        ((SXSSFSheet) sh).flushRows(flushNum);
    }

    /**
     * 导出文件
     * 
     * @throws Exception
     */
    public String exportFile() throws Exception {
        String filename = filePrefix+"_"+MyUtil.getCurrentTimeStr() + ".xlsx";
        File tmp = new File(filePath);
        if (!tmp.exists()) {         //判断文件是否存在
            tmp.mkdirs();
        }
        FileOutputStream out = new FileOutputStream(tmp+filename);
        wb.write(out);
        out.flush();
        out.close();
        setFileAllPath(fileWebPath + filename); //设置路径
        return fileWebPath + filename; //返回路径
    }

    /**
     * 反射方法，通过get方法获取对象属性
     * 
     * @param owner
     * @param fieldname
     * @param args
     * @return
     * @throws Exception
     */
    private Object invokeMethod(Object owner, String fieldname, Object[] args)
            throws Exception {

        String methodName = "get" + fieldname.substring(0, 1).toUpperCase()
                + fieldname.substring(1);
        Class ownerClass = owner.getClass();

        Class[] argsClass = new Class[args.length];

        for (int i = 0, j = args.length; i < j; i++) {
            argsClass[i] = args[i].getClass();
        }

        Method method = ownerClass.getMethod(methodName, argsClass);
        return method.invoke(owner, args);
    }

    public SXSSFWorkbook getWb() {
        return wb;
    }

    public void setWb(SXSSFWorkbook wb) {
        this.wb = wb;
    }

    public Sheet getSh() {
        return sh;
    }

    public void setSh(Sheet sh) {
        this.sh = sh;
    }   public int getFlushRows() {
        return flushRows;
    }

    public void setFlushRows(int flushRows) {
        this.flushRows = flushRows;
    }

    public String getFilePath() {
        return filePath;
    }

    public void setFilePath(String filePath) {
        this.filePath = filePath;
    }

    public String getFileWebPath() {
        return fileWebPath;
    }

    public void setFileWebPath(String fileWebPath) {
        this.fileWebPath = fileWebPath;
    }

    public List<String> getFieldNames() {
        return fieldNames;
    }

    public void setFieldNames(List<String> fieldNames) {
        this.fieldNames = fieldNames;
    }

    public List<String> getFieldCodes() {
        return fieldCodes;
    }

    public void setFieldCodes(List<String> fieldCodes) {
        this.fieldCodes = fieldCodes;
    }

    public int getRownum() {
        return rownum;
    }

    public String getFilePrefix() {
        return filePrefix;
    }

    public void setFilePrefix(String filePrefix) {
        this.filePrefix = filePrefix;
    }

    public int getColnum() {
        return colnum;
    }

    public String getFileAllPath() {
        return fileAllPath;
    }

    public void setFileAllPath(String fileAllPath) {
        this.fileAllPath = fileAllPath;
    }
    
    public static void main(String[] args) throws Exception {
        /**            导出文件存放物理路径
         * @param fileWebPath
         *            导出文件web下载路径
         * @param filePrefix
         *            导出文件名的前缀          
         * @param flushRows
         *            存放在内存的数据量
         * @param fieldNames
         *            导出文件列标题
         * @param fieldCodes
         *            导出数据对象的字段名称     
         * @param flushRows*/
        //导出文件存放的路径，并且是虚拟目录指向的路径
        String filePath = "d:/upload/linshi/";
        //导出文件的前缀
        String filePrefix="ypxx";
        //-1表示关闭自动刷新，手动控制写磁盘的时机，其它数据表示多少数据在内存保存，超过的则写入磁盘
        int flushRows=100;
        
        //定义导出数据的title
        List<String> fieldNames=new ArrayList<String>();
        fieldNames.add("流水号");
        fieldNames.add("通用名");
        fieldNames.add("价格");
        
        //告诉导出类数据list中对象的属性，让ExcelExportSXXSSF通过反射获取对象的值
        List<String> fieldCodes=new ArrayList<String>();
        fieldCodes.add("bm");//药品流水号
        fieldCodes.add("mc");//通用名
        fieldCodes.add("price");//价格
        
        //注意：fieldCodes和fieldNames个数必须相同且属性和title顺序一一对应，这样title和内容才一一对应
        
        
        //开始导出，执行一些workbook及sheet等对象的初始创建
        ExcelExportSXXSSF excelExportSXXSSF = ExcelExportSXXSSF.start(filePath, "/upload/", filePrefix, fieldNames, fieldCodes, flushRows);
        
        //准备导出的数据，将数据存入list，且list中对象的字段名称必须是刚才传入ExcelExportSXXSSF的名称
        List<Ypxx> list = new ArrayList<Ypxx>();
        for (int i=0; i<=1048574; i++) {
            Ypxx ypxx1 = new Ypxx("001"+i, "青霉素"+i, i);
            list.add(ypxx1);
        }   
        //执行导出
        excelExportSXXSSF.writeDatasByObject(list);
        //输出文件，返回下载文件的http地址
        String webpath = excelExportSXXSSF.exportFile();
        
        System.out.println(webpath);
        
        
    }

}

poi 所需要的工具类

package test;

import java.io.UnsupportedEncodingException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MyUtil {
    private static final String CNUMBER_PATTERN = "^[0-9]*$";// 判断数字的正则表达式
    
    

    private static SimpleDateFormat bartDateFormat = new SimpleDateFormat(
            "yyyy-MM-dd");

    public static int getYear(Date date) {
        try {
            String form_date = bartDateFormat.format(date);
            return Integer.parseInt(form_date.substring(0, 4));
        } catch (Exception ex) {
            return Integer.parseInt(getCurrentTime().substring(0, 4));
        }
    }

    public static int getMonth(Date date) {
        try {
            String form_date = bartDateFormat.format(date);
            return Integer.parseInt(form_date.substring(5, form_date
                    .lastIndexOf("-")));
        } catch (Exception ex) {
            String currenttimel = getCurrentTime();
            return Integer.parseInt(currenttimel.substring(5, currenttimel
                    .lastIndexOf("-")));
        }
    }

    public static int getDay(Date date) {
        try {
            String form_date = bartDateFormat.format(date);
            return Integer.parseInt(form_date.substring(form_date
                    .lastIndexOf("-") + 1, form_date.length()));
        } catch (Exception ex) {
            String currenttimel = getCurrentTime();
            return Integer.parseInt(currenttimel.substring(5, currenttimel
                    .lastIndexOf("-")));
        }

    }

    public static String[] getMonth_days(Date date) {
        String[] month_day = { "31", "28", "31", "30", "31", "30", "31", "31",
                "30", "31", "30", "31" };
        int year = getYear(date);
        if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0))
            month_day[1] = "29";
        return month_day;
    }

    public static int getCount(String str, String sign) {
        if (str == null) {
            return 0;
        }
        StringTokenizer s = new StringTokenizer(str, sign);
        return s.countTokens();
    }

    public static String[] getArray(String str, String sign) {
        int count = getCount(str, sign);
        int j = 0;
        String[] arr = new String[count];
        for (int i = 0; i < count; i++) {
            if (str.indexOf(sign) != -1) {
                j = str.indexOf(sign);
                arr[i] = str.substring(0, j);
                str = str.substring(j + 1);
            } else {
                arr[i] = str;
            }
            // System.out.println(arr[i]);
        }
        return arr;
    }

    public static String getCurrentTime() {
        java.sql.Timestamp temp = new java.sql.Timestamp(System
                .currentTimeMillis());
        return (temp.toString()).substring(0, 19);
    }

    public static Date toDateType(String s) {
        DateFormat df = DateFormat.getDateInstance();
        df.setLenient(false);
        s = s.replace(‘/‘, ‘-‘);
        s = s.replace(‘.‘, ‘.‘);
        try {
            return df.parse(s);
        } catch (Exception e) {
            return null;
        }
    }

    public static String unicodeToGB(String strIn) {
        byte[] b;
        String strOut = null;
        if (strIn == null || (strIn.trim()).equals("")) {
            return strIn;
        }
        try {
            b = strIn.getBytes("GBK");
            strOut = new String(b, "ISO8859_1");
        } catch (UnsupportedEncodingException e) {
        }
        return strOut;
    }

    public static String GBToUnicode(String strIn) {
        String strOut = null;
        if (strIn == null || (strIn.trim().equals(""))) {
            return strIn;
        }
        try {
            byte[] b = strIn.getBytes("ISO8859_1");
            strOut = new String(b, "GBK");
        } catch (Exception e) {
        }
        return strOut;
    }

    public static String UTFToUnicode(String strIn) {
        String strOut = null;
        if (strIn == null || (strIn.trim().equals(""))) {
            return strIn;
        }
        try {
            byte[] b = strIn.getBytes("ISO8859_1");
            strOut = new String(b, "UTF-8");
        } catch (Exception e) {
        }
        return strOut;
    }

    public static String UTFToGBK(String strIn) {
        String strOut = null;
        if (strIn == null || (strIn.trim().equals(""))) {
            return strIn;
        }
        try {
            byte[] b = strIn.getBytes("GBK");
            strOut = new String(b, "UTF-8");
        } catch (Exception e) {
        }
        return strOut;
    }

    public static String buildURL(Map parameters) {
        StringBuffer url = new StringBuffer();
        if (parameters != null && parameters.size() > 0) {
            url.append("?");
            for (Iterator iter = parameters.keySet().iterator(); iter.hasNext();) {
                String key = (String) iter.next();
                String[] values = (String[]) parameters.get(key);
                for (int i = 0; i < values.length; i++) {
                    url.append(key).append("=").append(values[i]).append("&");
                }
            }
        }
        return url.toString();
    }

    /**
     * 获得当前时间(根据格式字符串)
     * 
     * @param format
     *            String 格式字符串
     * @return String
     */
    public static String getDateByFormat(String format) {
    
        Calendar date = Calendar.getInstance();
        //System.out.print("date.getTime()==="+date.getTime());
        java.text.SimpleDateFormat sim = new java.text.SimpleDateFormat(format);
        String str = sim.format(date.getTime());
        return str;

    }

    /**
     * 获得当前时间
     * 
     * @return String
     */
    public static String getDate() {
        Calendar date = Calendar.getInstance();
        java.text.SimpleDateFormat sim = new java.text.SimpleDateFormat(
                "yyyy-MM-dd HH:mm:ss");
        String str = sim.format(date.getTime());
        return str;

    }
    
    
    /**
     * 获得当前时间
     * 
     * @return Date
     */
    public static Date getNowDate() {
        /*Calendar date = Calendar.getInstance();
        return date.getTime();*/
        return getDate(getDate());
    }

    /**
     * 字符串转换为时间
     * 
     * @param date
     *            String
     * @return Date
     */
    public static Date getDate(String date) {

        try {
            SimpleDateFormat localTime = new SimpleDateFormat(
                    "yyyy-MM-dd HH:mm:ss");
            Date date1 = localTime.parse(date);
            return date1;
        }

        catch (ParseException ex) {
            ex.printStackTrace();
        }
        return null;

    }

    /**
     * 字符串转换为时间2
     * 
     * @param date
     *            String
     * @return Date
     */
    public static Date getDate2(String date) {

        try {
            SimpleDateFormat localTime = new SimpleDateFormat("yyyy-MM-dd");
            Date date1 = localTime.parse(date);
            return date1;
        }

        catch (ParseException ex) {
            ex.printStackTrace();
        }
        return null;

    }

    /**
     * 字符串转换为时间3
     * 
     * @param date
     *            String
     * @return Date
     */
    public static Date getDate3(String date) {

        try {
            SimpleDateFormat localTime = new SimpleDateFormat("yyyy-MM");
            Date date1 = localTime.parse(date);
            return date1;
        }

        catch (ParseException ex) {
            ex.printStackTrace();
        }
        return null;

    }
    
    /**
     * 字符串转换为时间3
     * 
     * @param date
     *            String
     * @return Date
     */
    public static Date getDateByHHMM(String date) {

        try {
            SimpleDateFormat localTime = new SimpleDateFormat("HH:mm");
            Date date1 = localTime.parse(date);
            return date1;
        }

        catch (ParseException ex) {
            ex.printStackTrace();
        }
        return null;

    }

    /**
     * 字符串转换为时间3
     * 
     * @param date
     *            String
     * @return Date
     */
    public static Date getDate4(String date) {

        try {
            SimpleDateFormat localTime = new SimpleDateFormat("yyyy");
            Date date1 = localTime.parse(date);
            return date1;
        }

        catch (ParseException ex) {
            ex.printStackTrace();
        }
        return null;

    }

    /**
     * 取得秒数
     */
    public static Long getDateDiff_Second(Date d1, Date d2) {
        return (d2.getTime() - d1.getTime()) / 1000;
    }

    /**
     * 取得分钟
     * 
     * @param d1
     *            Date
     * @param d2
     *            Date
     * @return Long
     */
    public static Long getDateDiff_Minute(Date d1, Date d2) {
        return (d2.getTime() - d1.getTime()) / (1000 * 60);
    }

    /**
     * 取得小时
     * 
     * @param d1
     *            Date
     * @param d2
     *            Date
     * @return Long
     */
    public static Long getDateDiff_Hour(Date d1, Date d2) {
        return (d2.getTime() - d1.getTime()) / (1000 * 3600);
    }

    public static Long getDateDiff_Hour(String d1, String d2) {
        return (getDate(d2).getTime() - getDate(d1).getTime()) / (1000 * 3600);
    }

    /**
     * 取得天数
     * 
     * @param d1
     *            Date
     * @param d2
     *            Date
     * @return Long
     */
    public static Long getDateDiff_Day(Date d1, Date d2) {
        return (d2.getTime() - d1.getTime()) / (1000 * 3600 * 24);
    }

    public static Long getDateDiff_Day(String d1, String d2) {
        return (getDate(d2).getTime() - getDate(d1).getTime())
                / (1000 * 3600 * 24);
    }

    /**
     * 取得星期间隔
     * 
     * @param d1
     *            Date
     * @param d2
     *            Date
     * @return Long
     */
    public static Long getDateDiff_Week(Date d1, Date d2) {
        return (d2.getTime() - d1.getTime()) / (1000 * 3600 * 24 * 7);
    }

    /**
     * 取得当前时间的 间隔多少小时之后的时间
     * 
     * @param hour
     *            int
     * @return String
     */
    public static String getDateAdd(int hour) {

        Calendar calendar = Calendar.getInstance();
        java.text.SimpleDateFormat sd = new SimpleDateFormat(
                "yyyy-MM-dd HH:mm:ss");
        calendar.set(Calendar.HOUR, hour + calendar.get(Calendar.HOUR));
        String enddate = sd.format(calendar.getTime());
        return enddate;

    }

    /**
     * 取得当前时间的 间隔多少小时之后的时间
     * 
     * @param hour
     *            int
     * @return String
     */
    public static String getDateAdd(String starttime, int hour) {

        Calendar calendar = Calendar.getInstance();

        java.text.SimpleDateFormat sd = new SimpleDateFormat(
                "yyyy-MM-dd HH:mm:ss");
        calendar.setTime(getDate(starttime));
        calendar.set(Calendar.HOUR, hour + calendar.get(Calendar.HOUR));
        String date = sd.format(calendar.getTime());
        return date;

    }
    public static Date getDateAdd(Date starttime, int hour) {

        Calendar calendar = Calendar.getInstance();

        java.text.SimpleDateFormat sd = new SimpleDateFormat(
                "yyyy-MM-dd HH:mm:ss");
        calendar.setTime(starttime);
        calendar.set(Calendar.HOUR, hour + calendar.get(Calendar.HOUR));
        return calendar.getTime();

    }

    /**
     * 取得当前时间的 间隔多少小时之后的时间
     * 
     * @param hour
     *            int
     * @return String
     */
    public static String getDateAdd2(String starttime, int hour) {

        Calendar calendar = Calendar.getInstance();

        java.text.SimpleDateFormat sd = new SimpleDateFormat("yyyy-MM-dd");
        calendar.setTime(getDate2(starttime));
        calendar.set(Calendar.HOUR, hour + calendar.get(Calendar.HOUR));
        String date = sd.format(calendar.getTime());
        return date;

    }

    /**
     * 取得当前时间的 间隔多少秒之后的时间
     * 
     * @param hour
     *            int
     * @return String
     */
    public static String getDateAddSecond(String starttime, long second) {

        Calendar calendar = Calendar.getInstance();

        java.text.SimpleDateFormat sd = new SimpleDateFormat(
                "yyyy-MM-dd HH:mm:ss");
        calendar.setTime(getDate2(starttime));
        calendar.set(Calendar.SECOND, (int) (second + calendar
                .get(Calendar.SECOND)));
        String date = sd.format(calendar.getTime());
        return date;

    }

    /**
     * 获得时间格式的文件名称
     * 
     * @return String
     */
    public static String getFileName() {
        Calendar date = Calendar.getInstance();
        java.text.SimpleDateFormat sim = new java.text.SimpleDateFormat(
                "yyyyMMdd_hhmmss");
        String str = sim.format(date.getTime());
        return str;
    }

    // 获得月日
    public static String get_MM_DD(String s) {
        java.text.SimpleDateFormat sim = new java.text.SimpleDateFormat(
                "yyyy-MM-dd HH:mm:ss");
        Date date;
        String str = "";
        try {
            date = sim.parse(s);
            sim = new java.text.SimpleDateFormat("[MM-dd]");
            str = sim.format(date.getTime());
        } catch (ParseException e) {
            e.printStackTrace();
        } finally {
            return str;

        }
    }

    // 获得年月日

    public static String get_YYYY_MM_DD(String s) {
        java.text.SimpleDateFormat sim = new java.text.SimpleDateFormat(
                "yyyy-MM-dd HH:mm:ss");
        Date date;
        String str = "";
        try {
            date = sim.parse(s);
            sim = new java.text.SimpleDateFormat("yyyy-MM-dd");
            str = sim.format(date.getTime());
        } catch (ParseException e) {
            e.printStackTrace();
        } finally {
            return str;

        }
    }

    // 获得年月

    public static String get_YYYY_MM(String s) {
        java.text.SimpleDateFormat sim = new java.text.SimpleDateFormat(
                "yyyy-MM-dd HH:mm:ss");
        Date date;
        String str = "";
        try {
            date = sim.parse(s);
            sim = new java.text.SimpleDateFormat("yyyy-MM");
            str = sim.format(date.getTime());
        } catch (ParseException e) {
            e.printStackTrace();
        } finally {
            return str;

        }
    }

    // 获得年

    public static String get_YYYY(String s) {
        java.text.SimpleDateFormat sim = new java.text.SimpleDateFormat(
                "yyyy-MM-dd HH:mm:ss");
        Date date;
        String str = "";
        try {
            date = sim.parse(s);
            sim = new java.text.SimpleDateFormat("yyyy");
            str = sim.format(date.getTime());
        } catch (ParseException e) {
            e.printStackTrace();
        } finally {
            return str;

        }
    }

    /**
     * 检查IP是否合法
     * 
     * @param value
     * @return
     */

    public static boolean ipValid(String s) {
        String regex0 = "(2[0-4]\\d)" + "|(25[0-5])";
        String regex1 = "1\\d{2}";
        String regex2 = "[1-9]\\d";
        String regex3 = "\\d";
        String regex = "(" + regex0 + ")|(" + regex1 + ")|(" + regex2 + ")|("
                + regex3 + ")";
        regex = "(" + regex + ").(" + regex + ").(" + regex + ").(" + regex
                + ")";
        Pattern p = Pattern.compile(regex);
        Matcher m = p.matcher(s);
        return m.matches();
    }

    /**
     * 将java.util.Date 格式转换为字符串格式‘yyyy-MM-dd HH:mm:ss‘(24小时制)<br>
     * 如Sat May 11 17:24:21 CST 2002 to ‘2002-05-11 17:24:21‘<br>
     * 
     * @param time
     *            Date 日期<br>
     * @return String 字符串<br>
     */

    public static String dateToString(Date time) {
        SimpleDateFormat formatter;
        formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String ctime = formatter.format(time);
        return ctime;
    }
    public static String dateToString2(Date time) {
        SimpleDateFormat formatter;
        formatter = new SimpleDateFormat("yyyy-MM-dd");
        String ctime = formatter.format(time);
        return ctime;
    }
    public static String yymmdddateToString(Date time) {
        SimpleDateFormat formatter;
        formatter = new SimpleDateFormat("yyyyMMdd");
        String ctime = formatter.format(time);
        return ctime;
    }

    public static String hhmmssdateToString(Date time) {
        SimpleDateFormat formatter;
        formatter = new SimpleDateFormat("hhmmss");
        String ctime = formatter.format(time);
        return ctime;
    }

    /**
     * 将java.util.Date 格式转换为字符串格式‘yyyy-MM-dd HH:mm:ss a‘(12小时制)<br>
     * 如Sat May 11 17:23:22 CST 2002 to ‘2002-05-11 05:23:22 下午‘<br>
     * 
     * @param time
     *            Date 日期<br>
     * @param x
     *            int 任意整数如：1<br>
     * @return String 字符串<br>
     */
    public static String dateToString(Date time, int x) {
        SimpleDateFormat formatter;
        formatter = new SimpleDateFormat("yyyy-MM-dd KK:mm:ss a");
        String ctime = formatter.format(time);

        return ctime;
    }

    // 判断字符串是否为Null或“”
    public static boolean isNotNullAndEmpty(String str) {
        if (null != str && !str.equals("")) {
            return true;
        }
        return false;
    }

    // 判断列表是否为Null或大小为0
    public static boolean isNotNullAndZero(List list) {
        if (null != list && list.size() > 0) {
            return true;
        }
        return false;
    }
    
    // 判断字符串是否为Null，trim之后判断是否为空
    public static boolean isNotNullAndEmptyByTrim(String str) {
        if (null != str && !str.trim().equals("")) {
            return true;
        }
        return false;
    }

    // 删除ArrayList中重复元素
    public static List removeDuplicate(List list) {
        HashSet h = new HashSet(list);
        list.clear();
        list.addAll(h);
        return list;
    }

    // 判断当前天是否为月末时间即加一天是否为下个月
    public static boolean isTheLastMonthDAY() {
        String curtime = getDate();
        String nexttime = getDateAdd(curtime, 24);
        if (!get_YYYY_MM(curtime).equals(get_YYYY_MM(nexttime))) {
            return true;
        }
        return false;
    }

    /**
     * 编码转换
     * 
     * @param str
     * @return
     */
    public static String getReadStr(String str) {
        try {
            String temp_p = str;
            byte[] temp_t = temp_p.getBytes("ISO-8859-1");
            String unicode = new String(temp_t, "gb2312");
            return unicode;
        } catch (Exception e) {
            return "null";
        }
    }

    public static String isoTOUTF(String str) {
        try {
            String temp_p = str;
            byte[] temp_t = temp_p.getBytes("ISO-8859-1");
            String unicode = new String(temp_t, "UTF-8");
            return unicode;
        } catch (Exception e) {
            return "null";
        }
    }

    public static String utfTOISO(String str) {
        try {
            String temp_p = str;
            byte[] temp_t = temp_p.getBytes("UTF-8");
            String unicode = new String(temp_t, "ISO-8859-1");
            return unicode;
        } catch (Exception e) {
            return "null";
        }
    }

    public static String toHtml(String str) {
        if (str == null) {
            return "";
        } else {
            str = str.replaceAll("<", "<");
            str = str.replaceAll(">", ">");
            str = str.replaceAll("‘", "‘‘");
            str = str.replaceAll(" ", " ");
            str = str.replaceAll("\n", "<br>");
        }
        return str;
    }

    public static String toText(String str) {
        if (str == null) {
            return "";
        } else {
            str = str.replaceAll("<", "<");
            str = str.replaceAll(">", ">");
            str = str.replaceAll("‘‘", "‘");
            str = str.replaceAll(" ", " ");
            str = str.replaceAll("<br>", "\n");
        }
        return str;
    }

    /**
     * 去掉字符串的html代码
     * 
     * @param htmlStr
     *            字符串
     * @return 结果
     */
    public static String htmlToStr(String htmlStr) {
        String result = "";
        boolean flag = true;
        if (htmlStr == null) {
            return null;
        }
        char[] a = htmlStr.toCharArray();
        int length = a.length;
        for (int i = 0; i < length; i++) {
            if (a[i] == ‘<‘) {
                flag = false;
                continue;
            }
            if (a[i] == ‘>‘) {
                flag = true;
                continue;
            }
            if (flag == true) {
                result += a[i];
            }
        }
        return result.toString().replaceAll(" ", " ");
    }

    /**
     * 去掉字符串里面的html代码。<br>
     * 要求数据要规范，比如大于小于号要配套,否则会被集体误杀。
     * 
     * @paramcontent 内容
     * @return去掉后的内容
     */
    public static String stripHtml(String content) {
        content = content.replaceAll("<p.*?>", "rn");
        content = content.replaceAll("<brs*/?>", "rn");
        content = content.replaceAll("<.*?>", "");
        content = content.replaceAll(" ", " ");
        return content;
    }

    /**
     * 判断某个数据是否在已知的List中存在的方法 存在则返回true否则返回faluse
     * 
     * @param List
     *            已知的List集合
     * @param Strng
     *            已知的字符串
     * @return boolean true/false
     */

    public static boolean theDateIsInThelist(List thelist, String thestring) {

        if (null != thelist && thelist.size() > 0) {
            if (null != thestring) {
                for (int i = 0; i < thelist.size(); i++) {
                    String curstring = (String) thelist.get(i);
                    if (thestring.equals(curstring)) {
                        return true;
                    }
                }
            }
        }
        return false;
    }

    /**
     * 将短时间格式字符串转换为时间 yyyy-MM-dd
     * 
     * @param strDate
     * @return
     */
    public static Date strToDate(String strDate) throws Exception {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
        ParsePosition pos = new ParsePosition(0);
        Date strtodate = formatter.parse(strDate, pos);
        return strtodate;
    }

    /**
     *@param ms
     *            为要转换的秒数
     *@return 返回h m s数组
     */
    public static long[] toHMS(long ms) {
        long d;// 天
        long s;// 秒
        long h;// 小时
        long m;// 分钟
        d = ms / 3600 / 24;
        h = (ms - d * 24 * 3600) / 3600;
        m = (ms - h * 60 * 60 - d * 24 * 3600) / 60;
        s = ms - h * 60 * 60 - m * 60 - d * 24 * 3600;
        return new long[] { d, h, m, s };
    }
    
    /**
     * 获取当前时间的字符串 格式为"yyyyMMddHHmmss"
     * @return 返回获取的当前时间
     */
    public static String getCurrentTimeStr() {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        String curDate = sdf.format(new Date());
        
        return curDate;
    }
    
    /**
     * 
     * @return
     */
    public static String getStartTimeStr(){
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
        String startDate = sdf.format(new Date(0));
        
        return startDate;
    }

    public static boolean isInteger(String value){
      /*Pattern p = Pattern.compile(CNUMBER_PATTERN);
      Matcher m = p.matcher(value);
      return m.find();*/
        try{
            java.lang.Integer.parseInt(value);
        }catch(Exception e){
            return false;
        }
        return true;
  }
    public static boolean isFlost(String value){
        try{
            java.lang.Float.parseFloat(value);
        }catch(Exception e){
            return false;
        }
        return true;
      }
    
    public static boolean isDate(String value,String formatstr){
        try{
            SimpleDateFormat formatter = new SimpleDateFormat(formatstr);
            formatter.setLenient(false);
            formatter.parse(value);
            return true;
        }catch(Exception e){
            e.printStackTrace();
            return false;
        }
        
      }
    
    public static void main(String[] args) {

        
/*      BigDecimal b1 = new BigDecimal("4315813000");
        BigDecimal b2 = new BigDecimal(1000);

        BigDecimal b3 = b1.divide(b2, 0, BigDecimal.ROUND_HALF_UP);
        System.out.println("b3===" + b3);
        long[] hms = toHMS(b3.longValue());
        System.out.println(hms[0] + "   D   " + hms[1] + "   H   " + hms[2]
                + "M" + hms[3] + "S");*/
        /*
        ArrayList list = new ArrayList();
        String mib = "1.2.3";
        list.add("1.2.3.1.0");
        list.add("1.2.3.5");
        list.add("1.2.3.3.0");
        list.add("1.2.3.8");
        list.add("1.2.3.12");
        List lastvaluelt=  new ArrayList();
        List lostlist = new ArrayList();
        for(int i = 0;i<list.size();i++){
         String curmib = (String) list.get(i);
         String curvalue_andend = curmib.substring(mib.length() + 1,
                    curmib.length());
         String curvalue="";
         if(curvalue_andend.indexOf(".")!=-1){
             curvalue = curvalue_andend.substring(0, curvalue_andend
                    .indexOf("."));
             System.out.println("teststst=="+curvalue);
         }else{
             curvalue=curvalue_andend;
         }
         lastvaluelt.add(curvalue);
        } 
        
        Comparator comp = new ContentComparator();
        Collections.sort(lastvaluelt,comp); 
        int theMaxValue = Integer.valueOf((String) lastvaluelt.get(lastvaluelt.size()-1));
        for(int i = 1;i<theMaxValue;i++){
            boolean flag = false;
            for(int j = 0;j<lastvaluelt.size();j++){
                String curval = (String) lastvaluelt.get(j);
                if(Integer.parseInt(curval)==i){
                    flag = true;
                    break;
                }
                
            }
            if(!flag){
                lostlist.add(i);
            }
            
        }
        
        for (int i = 0; i < lostlist.size(); i++) {
            System.out.println(lostlist.get(i));
        }
        */
        //MyUtil.getStartTimeStr();

    }

}

实体类（需要的数据封装在这里）

package test;

import java.util.Date;

public class Ypxx {
    private String bm;
    private String mc;
    private float price;
    private String kkk;
    private String pzwh;

    private Date pzwhyxq;

    private String jky;

    private String bzcz;

    private String bzdw;

    private Double lsjg;

    private String lsjgcc;

    private String zlcc;

    private String zlccsm;

    private String ypjybg;

    private String ypjybgbm;

    private Date ypjybgyxq;

    private String jyzt;

    private String vchar1;
    public Ypxx(String bm,String mc,float price){
        this.bm = bm;
        this.mc = mc;
        this.price = price;
    }
    public String getKkk() {
        return kkk;
    }
    public void setKkk(String kkk) {
        this.kkk = kkk;
    }
    public String getPzwh() {
        return pzwh;
    }
    public void setPzwh(String pzwh) {
        this.pzwh = pzwh;
    }
    public Date getPzwhyxq() {
        return pzwhyxq;
    }
    public void setPzwhyxq(Date pzwhyxq) {
        this.pzwhyxq = pzwhyxq;
    }
    public String getJky() {
        return jky;
    }
    public void setJky(String jky) {
        this.jky = jky;
    }
    public String getBzcz() {
        return bzcz;
    }
    public void setBzcz(String bzcz) {
        this.bzcz = bzcz;
    }
    public String getBzdw() {
        return bzdw;
    }
    public void setBzdw(String bzdw) {
        this.bzdw = bzdw;
    }
    public Double getLsjg() {
        return lsjg;
    }
    public void setLsjg(Double lsjg) {
        this.lsjg = lsjg;
    }
    public String getLsjgcc() {
        return lsjgcc;
    }
    public void setLsjgcc(String lsjgcc) {
        this.lsjgcc = lsjgcc;
    }
    public String getZlcc() {
        return zlcc;
    }
    public void setZlcc(String zlcc) {
        this.zlcc = zlcc;
    }
    public String getZlccsm() {
        return zlccsm;
    }
    public void setZlccsm(String zlccsm) {
        this.zlccsm = zlccsm;
    }
    public String getYpjybg() {
        return ypjybg;
    }
    public void setYpjybg(String ypjybg) {
        this.ypjybg = ypjybg;
    }
    public String getYpjybgbm() {
        return ypjybgbm;
    }
    public void setYpjybgbm(String ypjybgbm) {
        this.ypjybgbm = ypjybgbm;
    }
    public Date getYpjybgyxq() {
        return ypjybgyxq;
    }
    public void setYpjybgyxq(Date ypjybgyxq) {
        this.ypjybgyxq = ypjybgyxq;
    }
    public String getJyzt() {
        return jyzt;
    }
    public void setJyzt(String jyzt) {
        this.jyzt = jyzt;
    }
    public String getVchar1() {
        return vchar1;
    }
    public void setVchar1(String vchar1) {
        this.vchar1 = vchar1;
    }
    public String getBm() {
        return bm;
    }
    public void setBm(String bm) {
        this.bm = bm;
    }
    public String getMc() {
        return mc;
    }
    public void setMc(String mc) {
        this.mc = mc;
    }
    public float getPrice() {
        return price;
    }
    public void setPrice(float price) {
        this.price = price;
    }
    @Override
    public String toString() {
        return "Ypxx [bm=" + bm + ", mc=" + mc + ", price=" + price + "]";
    }
    
    
}

POI 百万数据导出

标签：test   ica   sts   nal   名称   private   正则   date()   exp   

原文地址：https://www.cnblogs.com/qixidi/p/10213603.html