第三十三节（java-操作Excel实现企业级批量处理大数据）

package com.tanzhou.aduio;//创始一个包
import java.io.File;//引入类
import java.io.IOException;
import java.util.Scanner;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.format.UnderlineStyle;
//import jxl.read.biff.BiffException;
import jxl.write.DateFormat;
import jxl.write.DateTime;
import jxl.write.Label;
import jxl.write.NumberFormat;
import jxl.write.WritableCellFormat;
import jxl.write.WritableFont;
//import jxl.write.WritableImage;
import jxl.write.WritableSheet;
import jxl.write.WritableWorkbook;
//import jxl.write.WriteException;
//import jxl.write.biff.RowsExceededException;

public class TextOperatorExcel {// 操作Excel文件的类
    /**
     * 生成一个Excel文件
     */
    public static void writeExcel(String fileName) {
        WritableWorkbook wwb = null;
        try {
            //创建一个可写入的工作薄(Workbook)对象
            wwb = Workbook.createWorkbook(new File(fileName));
        } catch (IOException e) {// 捕获流异常
            e.printStackTrace();
        }
        if (wwb != null) {
            // 创建一个可写入的工作表
            // Workbook的createSheet方法有两个参数，第一个是工作表的名称，第二个是工作表在工作薄中的位置
            WritableSheet ws = wwb.createSheet("sheet1", 0);
            for (int i = 0; i < 10; i++) {// 循环添加单元格
                for (int j = 0; j < 5; j++) {
                    Label labelC = new Label(j, i, "这是第" + (i + 1) + "行，第"
                            + (j + 1) + "列");
                    try {
                        ws.addCell(labelC);// 将生成的单元格添加到工作表中
                    } catch (Exception e) {// 捕获异常
                        e.printStackTrace();
                    }

                }
            }
            try {
                wwb.write();// 从内存中写入文件中
                wwb.close();// 从内存中写入文件中
            } catch (Exception e) {// 捕获异常
                e.printStackTrace();
            }
        }
        System.out.println("生成一个Excel文件："+fileName+"成功!");
    }
    
    /**
     * 将内容写入
     * @param fileName
     * @throws Exception
     */
    public static void writeContentToExcel(String fileName) throws Exception{
        File tempFile=new File(fileName);
        WritableWorkbook workbook = Workbook.createWorkbook(tempFile);
        WritableSheet sheet = workbook.createSheet("TestCreateExcel", 0); 
        //一些临时变量，用于写到excel中
        Label l=null;
        jxl.write.Number n=null;
        jxl.write.DateTime d=null;

        //预定义的一些字体和格式，同一个Excel中最好不要有太多格式  字形  大小  加粗 倾斜  下划线 颜色
        WritableFont headerFont = new WritableFont(WritableFont.ARIAL, 12, WritableFont.BOLD, false, UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.BLUE); 
        WritableCellFormat headerFormat = new WritableCellFormat (headerFont); 

        WritableFont titleFont = new WritableFont(WritableFont.ARIAL, 10, WritableFont.NO_BOLD, false, UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.RED); 
        WritableCellFormat titleFormat = new WritableCellFormat (titleFont); 

        WritableFont detFont = new WritableFont(WritableFont.ARIAL, 10, WritableFont.NO_BOLD, false, UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.BLACK); 
        WritableCellFormat detFormat = new WritableCellFormat (detFont); 

        NumberFormat nf=new NumberFormat("0.00000");  //用于Number的格式
        WritableCellFormat priceFormat = new WritableCellFormat (detFont, nf); 

        DateFormat df=new DateFormat("yyyy-MM-dd");//用于日期的
        WritableCellFormat dateFormat = new WritableCellFormat (detFont, df); 

        l=new Label(0, 0, "用于测试的Excel文件", headerFormat);//创建一些单元格，再加到sheet中
        sheet.addCell(l);
        //添加标题
        int column=0;
        l=new Label(column++, 2, "标题", titleFormat);
        sheet.addCell(l);
        l=new Label(column++, 2, "日期", titleFormat);
        sheet.addCell(l);
        l=new Label(column++, 2, "货币", titleFormat);
        sheet.addCell(l);
        l=new Label(column++, 2, "价格", titleFormat);
        sheet.addCell(l);
        //添加内容
        int i=0;
        column=0;
        l=new Label(column++, i+3, "标题 "+i, detFormat);
        sheet.addCell(l);
        d=new DateTime(column++, i+3, new java.util.Date(), dateFormat);
        sheet.addCell(d);
        l=new Label(column++, i+3, "CNY", detFormat);
        sheet.addCell(l);
        n=new jxl.write.Number(column++, i+3, 5.678, priceFormat);
        sheet.addCell(n);
        i++;
        column=0;
        l=new Label(column++, i+3, "标题 "+i, detFormat);
        sheet.addCell(l);
        d=new DateTime(column++, i+3, new java.util.Date(), dateFormat);
        sheet.addCell(d);
        l=new Label(column++, i+3, "SGD", detFormat);
        sheet.addCell(l);
        n=new jxl.write.Number(column++, i+3, 98832, priceFormat);
        sheet.addCell(n);
        //设置列的宽度
        column=0;
        sheet.setColumnView(column++, 20);
        sheet.setColumnView(column++, 20);
        sheet.setColumnView(column++, 10);
        sheet.setColumnView(column++, 20);
        workbook.write();
        workbook.close();
        System.out.println("内容写入"+fileName+"成功");
    }

    public static void readExcelInfo(String fileName) 
        throws Exception {// 获得Excel文件多少行多少列
        Workbook book = Workbook.getWorkbook(new File(fileName));// 构造Workbook（工作薄）对象
        Sheet sheet = book.getSheet(0);
        // 得到第一列第一行的单元格// 获得第一个工作表对象
        int columnum = sheet.getColumns(); // 得到列数
        int rownum = sheet.getRows(); // 得到行数
        System.out.println(columnum);
        System.out.println(rownum);
        for (int i = 0; i < rownum; i++) // 循环进行读写
        {
            for (int j = 0; j < columnum; j++) {
                Cell cell1 = sheet.getCell(j, i);
                String result = cell1.getContents();
                System.out.print(result);
                System.out.print(" \t ");
            }
            System.out.println();
        }
        book.close();//关闭（工作薄）对象
    }
    
    public static void main(String[] args) {// java程序主入口处
        try {
            System.out.println("1.创建Excel文件，输入Excel文件名称（包括路径和后缀）");
            Scanner scan = new Scanner(System.in);
            final String fileName = scan.next();//获得键盘值
            writeExcel(fileName);//调用生成Excel方法
            
            System.out.println("2.将内容写入Excel文件");
            writeContentToExcel(fileName);//调用将内容写入Excel方法
            
            System.out.println("3.读取Excel文件");
            readExcelInfo(fileName);
        } catch (Exception e) {//捕获异常
            e.printStackTrace();
        }
    }
}