java 导出excel到客户端（本地）例子 用poi和servlet实现的

最近做java的web项目，用到了excel导出到客户端（本地），通过IE可以实现用浏览器保存、另存为、取消。我使用的是POI来完成的，poi架包是poi-3.7-20101029.jar这个架包在网上很容易找到。话不多说，进入实战demo。
项目结构：

第一步用MyEclipse创建一个web项目，名称：excelExport
第二步将下载的poi架包放到lib目录下，并添加到Build Path中：右击架包--》Build Path--》Add to Build Path.
第三步创建一个servlet，名称为：ExcelExportServlet.java，其代码如下：

package com.lujinyong.servlet;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;

public class ExcelExportServlet extends HttpServlet {
	//访问网址：http://localhost:8080/excelExport/servlet/ExcelExportServlet
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("octets/stream");
//		response.addHeader("Content-Disposition", "attachment;filename=test.xls");
		String excelName = "学生信息表";
		//转码防止乱码
		response.addHeader("Content-Disposition", "attachment;filename="+new String( excelName.getBytes("gb2312"), "ISO8859-1" )+".xls");
		String[] headers = new String[]{"编号","姓名","年龄","性别"};
		try {
			OutputStream out = response.getOutputStream();
			exportExcel(excelName,headers, getList(), out,"yyyy-MM-dd");
			out.close();
			System.out.println("excel导出成功！");
		} catch (FileNotFoundException e) {
				e.printStackTrace();
		} catch (IOException e) {
				e.printStackTrace();
		}
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		 doGet(request, response);
	}
	/**
	 * 
	 * @Description: 模拟从数据库中查询出来的数据，一般是数据表中的几列
	 * @Auther: lujinyong
	 * @Date: 2013-8-22 下午2:53:58
	 */
	public List<Map<String,Object>> getList(){
		List<Map<String,Object>> list = new ArrayList<Map<String,Object>>();
		for(int i = 0; i<100;i++){
			Map<String,Object> map = new HashMap<String, Object>();
			map.put("number",1000+i);
			map.put("name", "张三"+i);
			int age = (int)(Math.random()*100);
			do{
				age = (int)(Math.random()*100);
			}while(age<10||age>15);
			map.put("age", age);
			map.put("sex", age%2==0?0:1);//获得随机性别
			list.add(map);
		}
		return list;
	}
	/**
	 * 
	 * @Description: 生成excel并导出到客户端（本地）
	 * @Auther: lujinyong
	 * @Date: 2013-8-22 下午3:05:49
	 */
	protected void exportExcel(String title,String[] headers,List mapList,OutputStream out,String pattern){
		//声明一个工作簿
		HSSFWorkbook workbook = new HSSFWorkbook();
		//生成一个表格
		HSSFSheet sheet = workbook.createSheet(title);
		//设置表格默认列宽度为15个字符
		sheet.setDefaultColumnWidth(20);
		//生成一个样式，用来设置标题样式
		HSSFCellStyle style = workbook.createCellStyle();
		//设置这些样式
		style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
		style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		//生成一个字体
		HSSFFont font = workbook.createFont();
		font.setColor(HSSFColor.VIOLET.index);
		font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
		//把字体应用到当前的样式
		style.setFont(font);
		// 生成并设置另一个样式,用于设置内容样式
		HSSFCellStyle style2 = workbook.createCellStyle();
		style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
		style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
		// 生成另一个字体
		HSSFFont font2 = workbook.createFont();
		font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
		// 把字体应用到当前的样式
		style2.setFont(font2);
		//产生表格标题行
		HSSFRow row = sheet.createRow(0);
		for(int i = 0; i<headers.length;i++){
			HSSFCell cell = row.createCell(i);
			cell.setCellStyle(style);
			HSSFRichTextString text = new HSSFRichTextString(headers[i]);
			cell.setCellValue(text);
		}
		for (int i=0;i<mapList.size();i++) {
			Map<String,Object> map = (Map<String, Object>) mapList.get(i);
			row = sheet.createRow(i+1);
			int j = 0;
			Object value = null;
			value=map.get("number");
			if(value instanceof Integer){
				row.createCell(j++).setCellValue(String.valueOf(value));
			}
			row.createCell(j++).setCellValue(map.get("name").toString());
			value=map.get("age");
			if(value instanceof Integer){
				row.createCell(j++).setCellValue(String.valueOf(value));
			}
			row.createCell(j++).setCellValue("0".equals(map.get("sex").toString())?"女":"男");
		}
		try {
			workbook.write(out);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
}

第四步：将工程发布的tomcat中，运行，打开浏览器访问。如何知道访问的地址呢？打开WEB-INF下面的web.xml文件，我的是MyEclipse创建servlet时自动配置好的，代码如下，红色部分很关键,就是你访问网址最后面的两个excelExport是你的项目名称：
[url]
http://localhost:8080/excelExport/servlet/ExcelExportServlet
[/url]

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>ExcelExportServlet</servlet-name>
    <servlet-class>com.lujinyong.servlet.ExcelExportServlet</servlet-class>
  </servlet>
    <servlet-name>ExcelExportServlet</servlet-name>
    <url-pattern>[color=red]/servlet/ExcelExportServlet[/color]</url-pattern>
  </servlet-mapping>	
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

在浏览器中打开即可该网址就可以将“学生信息表.xls”下载下来。




转载请注明出处:http://kevin12.iteye.com/blog/1929341