SpringMVC POI导出EXCEL

             当今，J2EE企业级开发中SpringMVC无疑占据着举足轻重的地位，而POI又很好的支持了Excel操作，这两者的结合很好的支持了企业级报表系统的开发，废话不多说了，直接进入主题；

          1、首先，在项目的lib目录下导入SpringMVC相关的Jar包，同时，导入

        

       2、创建entity对象：

     

package com.entity;

import java.io.Serializable;

public class PersonEntity implements Serializable {

	private static final long serialVersionUID = 6916427667499861702L;
	private Integer id;
	private String name;
	private Integer age;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Integer getAge() {
		return age;
	}
	public void setAge(Integer age) {
		this.age = age;
	}
	
}

        3、创建dao接口和对应的实现类：

package com.dao;

import java.util.List;

import com.entity.PersonEntity;

public interface PersonEntityDao {
	List<PersonEntity> getList();
}

      dao接口的实现类

package com.dao.impl;
import com.dao.PersonEntityService;
import java.util.List;

import com.entity.PersonEntity;
@Repository
public class PersonEntityDaoImpl implements PersonEntityDao {

	@Override
	public List<PersonEntity> getList() {
		//操作数据库
		return null;
	}

}

       4、建立service接口和对应的实现类

package com.service;

import java.util.List;

import com.entity.PersonEntity;

public interface PersonEntityService {
	List<PersonEntity> getList();
}

     service实现类

package com.service.impl;

import java.util.List;
import com.dao.PersonEntityDao;

import com.entity.PersonEntity;
import com.service.PersonEntityService;
@Service
public class PersonEntityServiceImpl implements PersonEntityService {
	@Resource
        private PersonEntityDao personDao;
	@Override
	public List<PersonEntity> getList() {
		// TODO Auto-generated method stub
		return personDao.getList();
	}

}

      5、创建处理下载中文名称Excel的工具类（防止生成的Excel名称中有中文而出现乱码的现象）

package com.poi;
import java.net.URLEncoder;

import javax.mail.internet.MimeUtility;
import javax.servlet.http.HttpServletRequest;

import com.sinever.util.StringUtils;


public class MyUtils {
	/** 
     * 设置下载文件中文件的名称 
     *  
     * @param filename 
     * @param request 
     * @return 
     */  
    public static String encodeFilename(String filename, HttpServletRequest request) {  
      /** 
       * 获取客户端浏览器和操作系统信息 
       * 在IE浏览器中得到的是：User-Agent=Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; Alexa Toolbar) 
       * 在Firefox中得到的是：User-Agent=Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.7.10) Gecko/20050717 Firefox/1.0.6 
       */  
      String agent = request.getHeader("USER-AGENT");  
      try {  
        if ((agent != null) && (-1 != agent.indexOf("MSIE"))) {  
          String newFileName = URLEncoder.encode(filename, "UTF-8");  
          newFileName = StringUtils.replace(newFileName, "+", "%20");  
          if (newFileName.length() > 150) {  
            newFileName = new String(filename.getBytes("GB2312"), "ISO8859-1");  
            newFileName = StringUtils.replace(newFileName, " ", "%20");  
          }  
          return newFileName;  
        }  
        if ((agent != null) && (-1 != agent.indexOf("Mozilla")))  
          return MimeUtility.encodeText(filename, "UTF-8", "B");  
    
        return filename;  
      } catch (Exception ex) {  
        return filename;  
      }  
    } 
}

     6、创建ViewExcel类，此类要继承AbstractExcelView类，覆写AbstractExcelView类中的buildExcelDocument方法

         

package com.sinever.poi;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import com.entity.PersonEntity;
public class ViewExcel extends AbstractExcelView {
	@Override
	protected void buildExcelDocument(Map<String, Object> obj,
			HSSFWorkbook workbook, HttpServletRequest request, HttpServletResponse response)
			throws Exception {
        // map的key，在对应的controller中设置
         List<PersonEntity> list = (List<PersonEntity>) obj.get("list");
         HSSFSheet sheet = workbook.createSheet("list");  
        sheet.setDefaultColumnWidth((short) 12);  
        HSSFCell cell = getCell(sheet, 0, 0);  
        setText(cell, "ID");  
        cell = getCell(sheet, 0, 1);  
        setText(cell, "姓名");  
        cell = getCell(sheet, 0, 2);  
        setText(cell, "年龄");
        
        for (short i = 0; i < list.size(); i++) {  
        	HSSFRow sheetRow = sheet.createRow(i+1); 
        	PersonEntity entity = list.get(i);
        	sheetRow.createCell(0).setCellValue(entity.getId());  
            sheetRow.createCell(1).setCellValue(entity.getName());  
            sheetRow.createCell(2).setCellValue(entity.getAge());  
        } 
       //设置下载时客户端Excel的名称   
        String filename = new SimpleDateFormat("yyyy-MM-dd").format(new Date())+".xls";
      //处理中文文件名
        filename = MyUtils.encodeFilename(filename, request);
        response.setContentType("application/vnd.ms-excel");   
        response.setHeader("Content-disposition", "attachment;filename=" + filename);   
        OutputStream ouputStream = response.getOutputStream();   
        workbook.write(ouputStream);   
        ouputStream.flush();   
        ouputStream.close();   
	}
}

        7、创建相应的controller类

package com.controller;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.rmi.entity.PersonEntity;
import com.service.PersonEntityService;
import com.sinever.poi.ViewExcel;

@Controller
@RequestMapping(value="/person")
public class PersonEntityController {
	@Resourse
	private PersonEntityService personEntityService;
	
	@RequestMapping(value ="/export",method=RequestMethod.GET)
	public ModelAndView export(ModelMap model, HttpServletRequest request){
		List<PersonEntity> list = personEntityService.getList()
		ViewExcel viewExcel = new ViewExcel();  
               //将查询出的list集合存入ModelMap 对象中，此时的key就是ViewExcel类中Map所对应的key
                model.put("list", list);
                return new ModelAndView(viewExcel, model); 
	}
} 

        至此，整个过程结束，效果如下图：