JAVA导出Excel表格 一

利用java代码简单的导出Excel表格

POI简介:Apache POI是Apache软件基金会的开源项目,POI提供API给Java程序对Microsoft Office格式档案读和写的功能。 .NET的开发人员则可以利用NPOI (POI for .NET) 来存取 Microsoft Office文档的功能。

官方主页 http://poi.apache.org/index.html,
API文档 http://poi.apache.org/apidocs/index.html

现在用的比较多的都是用POI技术来导出或者导入Excel,所以我们就用POI吧,用POI导出Excel我们首先要下载所需的jar包然后导入到我们的项目中,用maven的同学只需找到相关依赖加入到pom.xml里面即可。

  1. 下载jar包:
    官方下载:http://poi.apache.org/download.html 这里可以下载到它的最新版本和文档

  2. 将jar包加入到项目中:
    如果是用maven的可自行到maven中央仓库搜索poi然后选择对应的版本即可,也可以直接将下面代码复制到pom.xml。

     
     
         org.apache.poi
         poi
         4.0.1
     
    
  3. Jakarta POI HSSF API组件:
    HSSF(用于操作Excel的组件)提供给用户使用的对象rg.apache.poi.hssf.usermodel包中,主要部分包括Excel对象,样式和格式,有以下几种常用的对象:

     常用组件:
     HSSFWorkbook     excel的文档对象
     HSSFSheet            excel的表单
     HSSFRow               excel的行
     HSSFCell                excel的格子单元
     HSSFFont               excel字体
     样式:
     HSSFCellStyle         cell样式
    

    4.基本操作步骤:
    首先,我们应该要知道的是,一个Excel文件对应一个workbook,一个workbook中有多个sheet组成,一个sheet是由多个行(row)和列(cell)组成。那么我们用poi要导出一个Excel表格的正确顺序应该是:

     	1、用HSSFWorkbook打开或者创建“Excel文件对象”
     	2、用HSSFWorkbook对象返回或者创建Sheet对象
     	3、用Sheet对象返回行对象,用行对象得到Cell对象
     	4、对Cell对象读写。
     	5、将生成的HSSFWorkbook放入HttpServletResponse中响应到前端页面
    

    5.编写工具类

     	package com.gs.java_poi_t1.util;
    
     	import org.apache.poi.hssf.usermodel.*;
     	
     	public class ExcelUtil {
     	    /**
     	     * 导出Excel
     	     * @param sheetName sheet名称
     	     * @param title 标题
     	     * @param values 内容
     	     * @param wb HSSFWorkbook对象
     	     * @return
     	     */
     	    public static HSSFWorkbook getHSSFWorkbook(String sheetName, String []title, String [][]values, HSSFWorkbook wb){
     	
     	        // 第一步,创建一个HSSFWorkbook,对应一个Excel文件
     	        if(wb == null){
     	            wb = new HSSFWorkbook();
     	        }
     	
     	        // 第二步,在workbook中添加一个sheet,对应Excel文件中的sheet
     	        HSSFSheet sheet = wb.createSheet(sheetName);
     	
     	        // 第三步,在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制
     	        HSSFRow row = sheet.createRow(0);
     	
     	        // 第四步,创建单元格,并设置值表头 设置表头居中
     	        HSSFCellStyle style = wb.createCellStyle();
     	        style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式
     	
     	        //声明列对象
     	        HSSFCell cell = null;
     	
     	        //创建标题
     	        for(int i=0;i

    6.控制层代码

     	package com.gs.java_poi_t1.controller;
    
     	import com.gs.java_poi_t1.bean.Employee;
     	import com.gs.java_poi_t1.util.ExcelUtil;
     	import org.apache.poi.hssf.usermodel.HSSFWorkbook;
     	import org.springframework.stereotype.Controller;
     	import org.springframework.web.bind.annotation.RequestMapping;
     	import org.springframework.web.bind.annotation.ResponseBody;
     	
     	import javax.servlet.http.HttpServletRequest;
     	import javax.servlet.http.HttpServletResponse;
     	import java.io.OutputStream;
     	import java.io.UnsupportedEncodingException;
     	import java.util.ArrayList;
     	import java.util.List;
     	
     	@Controller
     	@RequestMapping(value = "/report")
     	public class ExcelController {
     	
     	//    @Resource(name = "reportService")
     	//    private ReportManager reportService;
     	    @RequestMapping("/index")
     	    public String toindex(){
     	        return "/index";
     	    }
     	    /**
     	     * 导出报表
     	     *
     	     * @return
     	     */
     	    
     	    @RequestMapping(value = "/export")
     	    @ResponseBody
     	    public void export(HttpServletRequest request, HttpServletResponse response) throws Exception {
     	        //获取数据
     	//        List list = reportService.bookList(page);
     	        List list = new ArrayList();
     	        list.add(new Employee(10001,"张三","18890123456",2,"1.jpg"));
     	        list.add(new Employee(10002,"李四","15678129025",4,"2.jpg"));
     	        list.add(new Employee(10003,"王五","13921403367",1,"3.jpg"));
     	        list.add(new Employee(10001,"张三","18890123456",2,"1.jpg"));
     	        list.add(new Employee(10002,"李四","15678129025",4,"2.jpg"));
     	        list.add(new Employee(10003,"王五","13921403367",1,"3.jpg"));
     	
     	        //excel标题
     	        String[] title = {"编号", "名称", "头像", "号码", "部门编号"};
     	
     	        //excel文件名
     	        String fileName = "学生信息表" + System.currentTimeMillis() + ".xls";
     	
     	        //sheet名
     	        String sheetName = "学生信息表";
     	        //长度为  多少个字段
     	//        Integer index=title.length;
     	        //定义二维数组
     	        String content[][] = new String[list.size()][title.length];
     	        
     	        for (int i = 0; i < list.size(); i++) {
     	//            content[i]= new String[title.length];
     	            Employee obj = (Employee) list.get(i);
     	            System.out.println();
     	            content[i][0] = obj.getEid()+"";
     	            content[i][1] = obj.getEname();
     	            content[i][2] = obj.getFace();
     	            content[i][3] = obj.getPhone();
     	            content[i][4] = obj.getDid()+"";
     	        }
    
             //创建HSSFWorkbook 
             HSSFWorkbook wb = ExcelUtil.getHSSFWorkbook(sheetName, title, content, null);
     
             //响应到客户端
             try {
                 this.setResponseHeader(response, fileName);
                 OutputStream os = response.getOutputStream();
                 wb.write(os);
                 os.flush();
                 os.close();
             } catch (Exception e) {
                 e.printStackTrace();
             }
         }
    
         //发送响应流方法
         public void setResponseHeader(HttpServletResponse response, String fileName) {
             try {
                 try {
                     fileName = new String(fileName.getBytes(), "utf-8");
                 } catch (UnsupportedEncodingException e) {
                     // TODO Auto-generated catch block
                     e.printStackTrace();
                 }
                 response.setContentType("application/octet-stream;charset=utf-8");
                 response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
                 response.addHeader("Pargam", "no-cache");
                 response.addHeader("Cache-Control", "no-cache");
             } catch (Exception ex) {
                 ex.printStackTrace();
             }
         }
     }
    

    7.javabean实体类

     package com.gs.java_poi_t1.bean;
     
     public class Employee {
         private Integer eid;
         private String ename;
         private String phone;
         private Integer did;
         private String face;
     
         public Employee() {
         }
     
         public Employee(Integer eid, String ename, String phone, Integer did, String face) {
             this.eid = eid;
             this.ename = ename;
             this.phone = phone;
             this.did = did;
             this.face = face;
         }
     
         @Override
         public String toString() {
             return "Employee{" +
                     "eid=" + eid +
                     ", ename='" + ename + '\'' +
                     ", phone='" + phone + '\'' +
                     ", did=" + did +
                     ", face='" + face + '\'' +
                     '}';
         }
     
         public Integer getEid() {
             return eid;
         }
     
         public void setEid(Integer eid) {
             this.eid = eid;
         }
     
         public String getEname() {
             return ename;
         }
     
         public void setEname(String ename) {
             this.ename = ename;
         }
     
         public String getPhone() {
             return phone;
         }
     
         public void setPhone(String phone) {
             this.phone = phone;
         }
     
         public Integer getDid() {
             return did;
         }
     
         public void setDid(Integer did) {
             this.did = did;
         }
     
         public String getFace() {
             return face;
         }
     
         public void setFace(String face) {
             this.face = face;
         }
     }
    

    8.页面跳转
    JAVA导出Excel表格 一_第1张图片
    好啦,到此大功告成,谢谢大家耐心看完,喜欢的可以支持一下,有了大家的鼓励我会更有动力!!!

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