java使用jxls导出excel功能

在java的开发里,导出excel功能会经常遇到的,而jxls框架提供了很大的方便.

jxls官网:http://jxls.sourceforge.net/,官网的下载包里面也提供详细的文档说明.

下文提供思路,主要以web项目导出excel来举例jxls用法,文末也贴一下java项目导出excel功能(这个简单一点)

直接贴关键代码(其它关于怎么用java config方式的spring mvc不做说明)

1.引用jxls依赖

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<dependency>

<groupId>net.sf.jxls</groupId>

<artifactId>jxls-core</artifactId>

<version>1.0.5</version>

</dependency>

2.EmployeeController.java

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package com.exam.web;

import com.exam.domain.Employee;

import net.sf.jxls.transformer.XLSTransformer;

import org.apache.poi.openxml4j.exceptions.InvalidFormatException;

import org.apache.poi.ss.usermodel.Workbook;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.*;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

@Controller

@RequestMapping("/employee")

public class EmployeeController {

/**

* 这里接管了response,我们自己把response flush出去,所以返回类型是void(不要用什么String,否则会报响应已提交过的异常哦)

*/

@RequestMapping("/export")

public void export(HttpServletRequest request,HttpServletResponse response){

String templateFileName= request.getServletContext().getRealPath("/") + "/resources/templateFileName.xls";

String destFileName= "destFileName.xls";

//模拟数据

List<Employee> staff = new ArrayList<Employee>();

staff.add(new Employee("Derek", 35, 3000, 0.30));

staff.add(new Employee("Elsa", 28, 1500, 0.15));

staff.add(new Employee("Oleg", 32, 2300, 0.25));

Map<String,Object> beans = new HashMap<String,Object>();

beans.put("employees", staff);

XLSTransformer transformer = new XLSTransformer();

InputStream in=null;

OutputStream out=null;

//设置响应

response.setHeader("Content-Disposition", "attachment;filename=" + destFileName);

response.setContentType("application/vnd.ms-excel");

try {

in=new BufferedInputStream(new FileInputStream(templateFileName));

Workbook workbook=transformer.transformXLS(in, beans);

out=response.getOutputStream();

//将内容写入输出流并把缓存的内容全部发出去

workbook.write(out);

out.flush();

} catch (InvalidFormatException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

if (in!=null){try {in.close();} catch (IOException e) {}}

if (out!=null){try {out.close();} catch (IOException e) {}}

}

}

}

3.templateFileName.xls(内容是二进制,不容易贴出来)



这个JEXL语法和JSTL语法十分相似.

这里我们自己处理了Response,没必要交给spring的视图解析器.在返回响应前我们设置了响应的Header和ContentType以便客户端的浏览器解析为弹出下载.这里调用了transformer.transformXLS(in, beans)方法得到一个Workbook,这方法会把模板(至于模板怎么写,详细看官方文档)先读入到输入流再处理,再把Workbook的内容写入到输出流发送出去.

上文源码:http://download.csdn.net/detail/xiejx618/7836191

如果不想使用上面的模板，还有一种更灵活自定义的方法(比如编码定义excel样式,动态增加多个sheet等等),也可以在Controller方法直接返回AbstractXlsView.下面是一个例子:

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@RequestMapping(value = "listXls",method = RequestMethod.GET)

public View listXls() {

List<User> list = getUsers();

return new AbstractXlsView() {

@Override

protected void buildExcelDocument(Map<String, Object> model, Workbook workbook, HttpServletRequest request, HttpServletResponse response) throws Exception {

addSheet(workbook.createSheet("UserStatistics1"), list.subList(0, 50));//不包括第50个

addSheet(workbook.createSheet("UserStatistics2"), list.subList(50,list.size()));

}

};

}

private List<User> getUsers() {

List<User> list = new ArrayList<>();

for (int i = 0; i < 103; i++) {

User user = new User();

user.setUsername("name" + i);

user.setPassword("pwd" + i);

user.setId((long) i);

list.add(user);

}

return list;

}

private void addSheet(Sheet sheet, List<User> list) {

int rowNum=0;

Row row0 = sheet.createRow(rowNum++);

row0.createCell(0).setCellValue("ID");

row0.createCell(1).setCellValue("Username");

row0.createCell(2).setCellValue("Password");

row0.createCell(3).setCellValue("Height");

for (User user : list) {

Row row = sheet.createRow(rowNum++);

row.createCell(0).setCellValue(user.getId());

row.createCell(1).setCellValue(user.getUsername());

row.createCell(2).setCellValue(user.getPassword());

row.createCell(3).setCellValue(user.getHeight());

}

}

顺便贴一下java项目(不是web项目)的例子源码:http://download.csdn.net/detail/xiejx618/7836227