标签：
web.xml:
<web-app id="WebApp_9" version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
struts.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.multipart.maxSize" value="20971520000"></constant>
<package name="default" namespace="/" extends="json-default">
<action name="excelAction" class="com.huawei.s2.action.ExcelAction" method="excelTest">
<result name="excelTest" type="stream">
<param name="contentDisposition">attachment;filename=${fileName}</param>
</result>
</action>
</package>
</struts>
WebContent下的jsp(1.jsp):
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>测试struts2</title>
</head>
<body>
<a href="excelAction">生成excel</a>
</body>
</html>
action:
public class ExcelAction {
private String fileName;
private InputStream inputStream;
public String excelTest() throws Exception{
Person p1 = new Person(1,"aaa",Date.valueOf("2012-12-12"),2000.0);
Person p2 = new Person(2,"bbb",Date.valueOf("2012-12-12"),2000.0);
Person p3 = new Person(3,"张三",Date.valueOf("2012-02-12"),2000.0);
List<Person> personList = new ArrayList<Person>();
personList.add(p1);
personList.add(p2);
personList.add(p3);
//excel表格浏览器下载时显示的名字
fileName = "测试表格.xls";
//创建生成excel 数据的对象
XLSExport xls = new XLSExport();
String[] tabHeadContent = new String[]{"编号","姓名","入职日期","工资"};
xls.createTable(true, personList, tabHeadContent);
//导出excel
inputStream = xls.exportXLSByStruts();
return "excelTest";
}
public String getFileName() throws Exception{
return new String(fileName.getBytes("gbk"),"iso-8859-1");
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
public InputStream getInputStream() {
return inputStream;
}
public void setInputStream(InputStream inputStream) {
this.inputStream = inputStream;
}
}
po:
public class Person {
private Integer pid;
private String pname;
private Date hiredate;
private Double sal;
public Person(Integer pid, String pname, Date hiredate, Double sal) {
super();
this.pid = pid;
this.pname = pname;
this.hiredate = hiredate;
this.sal = sal;
}
public Date getHiredate() {
return hiredate;
}
public void setHiredate(Date hiredate) {
this.hiredate = hiredate;
}
public Double getSal() {
return sal;
}
public void setSal(Double sal) {
this.sal = sal;
}
public Integer getPid() {
return pid;
}
public void setPid(Integer pid) {
this.pid = pid;
}
public String getPname() {
return pname;
}
public void setPname(String pname) {
this.pname = pname;
}
}
util:
public class XLSExport {
// 定制日期格式
private static final String DATE_FORMAT = "m/d/yy h:mm" ; // "m/d/yy h:mm"
// 定制浮点数格式
private static final String NUMBER_FORMAT = " #,##0.00 " ;
private String xlsFileName;
private HSSFWorkbook workbook;
private HSSFSheet sheet;
private HSSFRow row;
/**
* 初始化Excel
*
* @param fileName
* 导出文件名
*/
public XLSExport(String fileName) {
this .xlsFileName = fileName;
this .workbook = new HSSFWorkbook();
this .sheet = workbook.createSheet();
}
public XLSExport() {
this .workbook = new HSSFWorkbook();
this .sheet = workbook.createSheet();
}
public void createTabHeader(String...tabHeadContent){
createRow(0);
for(int i = 0;i<tabHeadContent.length;i++){
setCell(i, tabHeadContent[i]);
}
}
public void createTable(boolean flag,List list,String...tabHeadContent) throws Exception{
if(flag){//如果有表头就创建表头
createTabHeader(tabHeadContent);
}
for(int i = 0;i<list.size();i++){
createRow(flag?i+1:i);//每条数据对应一行
Object obj = list.get(i);
Class clazz = obj.getClass();
Field[] fields = clazz.getDeclaredFields();
for(int j=0;j<fields.length;j++){
Class type = fields[j].getType();
String fieldName = fields[j].getName();
String getter = (type==boolean.class?"is":"get")+fieldName.substring(0,1).toUpperCase()+fieldName.substring(1);
Method method = clazz.getDeclaredMethod(getter);
Object fieldValue = method.invoke(obj);
if(fieldValue!=null){
if(type==Integer.class||type==int.class){
setCell(j, (Integer)fieldValue);
}else if(type==Double.class||type==double.class){
setCell(j, (Double)fieldValue);
}else if(type==Date.class||type==java.sql.Date.class){
setCell(j, (Date)fieldValue);//一会测试测试
}else if(type==String.class){
setCell(j, (String)fieldValue);//一会测试测试
}
}else{
setCell(j, "");
}
}
}
}
public InputStream exportXLSByStruts()throws Exception{
ByteArrayOutputStream bos = new ByteArrayOutputStream();//这个类ByteArrayOutputStream在这里很重要
workbook.write(bos);
InputStream inputStream = new ByteArrayInputStream(bos.toByteArray());
return inputStream;
}
/**
* 导出Excel文件
*
* @throws XLSException
*/
public void exportXLS() throws XLSException {
try {
FileOutputStream fOut = new FileOutputStream(xlsFileName);
workbook.write(fOut);
fOut.flush();
fOut.close();
} catch (FileNotFoundException e) {
throw new XLSException( " 生成导出Excel文件出错! ");
} catch (IOException e) {
throw new XLSException( " 写入Excel文件出错! ");
}
}
/**
* 增加一行
*
* @param index
* 行号
*/
public void createRow( int index) {
this .row = this .sheet.createRow(index);
}
/**
* 设置单元格
*
* @param index
* 列号
* @param value
* 单元格填充值
*/
public void setCell( int index, String value) {
HSSFCell cell = this .row.createCell(index);
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
cell.setCellValue(value);
}
/**
* 设置单元格
*
* @param index
* 列号
* @param value
* 单元格填充值
*/
public void setCell( int index, Calendar value) {
HSSFCell cell = this .row.createCell(index);
cell.setCellValue(value.getTime());
HSSFCellStyle cellStyle = workbook.createCellStyle(); // 建立新的cell样式
cellStyle.setDataFormat(HSSFDataFormat.getBuiltinFormat(DATE_FORMAT)); // 设置cell样式为定制的日期格式
cell.setCellStyle(cellStyle); // 设置该cell日期的显示格式
sheet.setColumnWidth(index, 5000);
}
public void setCell( int index, Date utilDate) {
Calendar c = new GregorianCalendar();
c.setTimeInMillis(utilDate.getTime());
setCell(index,c);
}
/**
* 设置单元格
*
* @param index
* 列号
* @param value
* 单元格填充值
*/
public void setCell( int index, int value) {
HSSFCell cell = this .row.createCell(index);
cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
cell.setCellValue(value);
}
/**
* 设置单元格
*
* @param index
* 列号
* @param value
* 单元格填充值
*/
public void setCell( int index, double value) {
HSSFCell cell = this .row.createCell(index);
cell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
cell.setCellValue(value);
HSSFCellStyle cellStyle = workbook.createCellStyle(); // 建立新的cell样式
HSSFDataFormat format = workbook.createDataFormat();
cellStyle.setDataFormat(format.getFormat(NUMBER_FORMAT)); // 设置cell样式为定制的浮点数格式
cell.setCellStyle(cellStyle); // 设置该cell浮点数的显示格式
}
public String getXlsFileName() {
return xlsFileName;
}
public void setXlsFileName(String xlsFileName) {
this.xlsFileName = xlsFileName;
}
public HSSFWorkbook getWorkbook() {
return workbook;
}
public void setWorkbook(HSSFWorkbook workbook) {
this.workbook = workbook;
}
public HSSFSheet getSheet() {
return sheet;
}
public void setSheet(HSSFSheet sheet) {
this.sheet = sheet;
}
public HSSFRow getRow() {
return row;
}
public void setRow(HSSFRow row) {
this.row = row;
}
}
XLSException:
public class XLSException extends Exception{
public XLSException() {
}
public XLSException(String message) {
super(message);
}
}
XLSDemo:
public class XLSDemo {
/**
* 学习方法：
* 1：资料 先看懂 根据程序 测试数据
* 2：根据自己需要 做一些改动
* 3：再根据自己需要 做一些封装
* 4： 直接应用
*/
public static void main(String[] args) throws Exception {
Person p1 = new Person(1,"aaa",Date.valueOf("2012-12-12"),2000.0);
Person p2 = new Person(2,"bbb",Date.valueOf("2012-12-12"),2000.0);
Person p3 = new Person(3,"张三",Date.valueOf("2012-02-12"),2000.0);
List<Person> personList = new ArrayList<Person>();
personList.add(p1);
personList.add(p2);
personList.add(p3);
XLSExport xls = new XLSExport("D:/test2.xls");
//先搞一个表头
String[] tabHeadContent = new String[]{"编号","姓名","入职日期","工资"};
xls.createTable(true, personList, tabHeadContent);
//再生成文件
xls.exportXLS();
}
}
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原文地址：http://www.cnblogs.com/hwgok/p/5472522.html
