JavaWeb-POI实现excel表格下载

页面效果

• 功能概述:

  选中要需要导出到excel的列(也可以是获取一些id)然后后台查找数据生成excel,用户点击导出到Excel就下载excle文件

前端页面

<%@ page pageEncoding="UTF-8"%>
<%@ taglib prefix="isperp" uri="/WEB-INF/tlds/isperp.tld"%>



    
    
        
        

    
    

    
    

        

            

                
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        特采单号"  align="center">合同编号" width="100" align="center">担当" width="100" align="center">创建时间" width="100" align="center">
    

• 1.这个页面使用了前端框架的封装,普通的 也是可以定义click事件
• 2.window.location = url是可以发送GET请求的

Java控制器

package itsm.isperp.module.controller.constract;

import com.fr.web.core.A.E;
import itsm.isperp.framework.web.controller.BaseController;
import itsm.isperp.module.entity.constract.TmcConstract;
import itsm.isperp.module.response.AaaRes;
import itsm.isperp.module.response.ExcelModel;
import itsm.isperp.module.service.constract.TmcConstractService;
import itsm.isperp.module.utils.ExcelUtils;
import org.apache.http.HttpRequest;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.InvocationTargetException;
import java.util.*;

/**
 * 控制器
 * 
 * @author lizx
 * @date 2020-05-18 16:45
 */
@Controller
@RequestMapping("constract/tmc")
public class TmcConstractController extends BaseController {

    @Autowired
    protected TmcConstractService tmcConstractService;

    @Override
    public TmcConstractService getService() {
        return this.tmcConstractService;
    }
    
    @Override
    public String getPageTitle() {
        return "TMC合同";
    }

    @RequestMapping(value = "export/excel", method = RequestMethod.GET)
    @ResponseBody
    public Map exportExcel(@RequestParam(value="aaa") String ids[],
          HttpServletRequest request, HttpServletResponse response) throws NoSuchMethodException,
          IllegalAccessException, InvocationTargetException, IOException {

        Map map= new HashMap<>();
        map.put("statusCode","200");
        map.put("message","导出成功！");

        String[] idss = request.getParameterValues("aaa");
        System.out.println(Arrays.toString(idss));

        AaaRes a2 = new AaaRes();
        a2.setId("111");
        a2.setName("人从众");

        AaaRes a1 = new AaaRes();
        a1.setId("111");
        a1.setName("又双叒叕");
        ExcelModel excelModel = new ExcelModel<>();

        List ths = new ArrayList();
        ths.add("编号");
        ths.add("姓名");

        List aaaRes = new ArrayList<>();
        aaaRes.add(a1);
        aaaRes.add(a2);
        excelModel.setThs(ths);
        excelModel.setTrs(aaaRes);


        // TODO 调用Excel生成工具类,返回流数据
        Workbook workbook = ExcelUtils.excelStream(excelModel);
        String fileName = "aaa"+System.currentTimeMillis()+".xlsx";
        setResponseHeader(response, fileName);
        OutputStream os = response.getOutputStream();
        workbook.write(os);

        os.flush();
        os.close();~~~~
        return map;
    }

    // 封装请求数据
    public void setResponseHeader(HttpServletResponse response, String fileName) {
        response.setContentType("application/octet-stream;charset=ISO8859-1");
        response.setHeader("Content-Disposition", "attachment;filename="+ fileName);
        response.addHeader("Pargam", "no-cache");
        response.addHeader("Cache-Control", "no-cache");
    }

}

ExcelUtil

package utils;

import itsm.isperp.module.response.AaaRes;
import itsm.isperp.module.response.ExcelModel;
import itsm.isperp.module.utils.ExcelUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.junit.Test;

import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;

/**
 * @Description
 * @Project isperp-itss
 * @Author ZhiYue
 * @Date 2020/5/27 13:27
 */
public class ExcelUtilTest {

    @Test
    public void test() throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
        AaaRes a2 = new AaaRes();
        a2.setId("111");
        a2.setName("人从众");

        AaaRes a1 = new AaaRes();
        a1.setId("111");
        a1.setName("又双叒叕");
        ExcelModel excelModel = new ExcelModel<>();

        List ths = new ArrayList();
        ths.add("编号");
        ths.add("姓名");

        List aaaRes = new ArrayList<>();
        aaaRes.add(a1);
        aaaRes.add(a2);
        excelModel.setThs(ths);
        excelModel.setTrs(aaaRes);

        Workbook workbook = ExcelUtils.excelStream(excelModel);
    }
}

ExcelModel

package itsm.isperp.module.response;

import itsm.isperp.module.base.Model;

import java.util.List;

/**
 * @Description
 * @Project isperp-itss
 * @Author ZhiYue
 * @Date 2020/5/26 17:39
 */
public class ExcelModel extends Model {

    private Integer columnWidth;

    private Integer columnHeight;

    private List ths;

    private List trs;

    public List getTrs() {
        return trs;
    }

    public void setTrs(List trs) {
        this.trs = trs;
    }

    public List getThs() {
        return ths;
    }

    public void setThs(List ths) {
        this.ths = ths;
    }

    public Integer getColumnWidth() {
        return columnWidth;
    }

    public void setColumnWidth(Integer columnWidth) {
        this.columnWidth = columnWidth;
    }

    public Integer getColumnHeight() {
        return columnHeight;
    }

    public void setColumnHeight(Integer columnHeight) {
        this.columnHeight = columnHeight;
    }
}

AaaRes

package itsm.isperp.module.response;

/**
 * @Description 测试
 * @Project isperp-itss
 * @Author ZhiYue
 * @Date 2020/5/26 17:48
 */
public class AaaRes extends ExcelModel{

    private String id;

    private String name;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

后记: 下班了先这样