实现前端一键后台生成csv文件以及csv下载功能

后台生成csv文件，完成前端下载功能

后台java代码
package com.jzt.mdsl.core.utils;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.beanutils.BeanUtils;

/**
* 文件操作
*/
public class CSVUtils {

  /**
   * 生成为CVS文件
   * @param exportData
   *       源数据List
   * @param map
   *       csv文件的列表头map
   * @param outPutPath
   *       文件路径
   * @param fileName
   *       文件名称
   * @return
* @throws IOException
   */
  @SuppressWarnings("rawtypes")
  public static void createCSVFile(HttpServletResponse response,List exportData, LinkedHashMap map, String outPutPath,
                   String fileName) throws IOException {
    File csvFile = null;
    BufferedWriter csvFileOutputStream = null;
    try {
      File file = new File(outPutPath);
      if (!file.exists()) {
        file.mkdir();
      }
      //定义文件名格式并创建
      csvFile = File.createTempFile(fileName, ".csv", new File(outPutPath));
      // UTF-8使正确读取分隔符","
      csvFileOutputStream = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(
        csvFile), "UTF-8"), 1024);
      // 写入文件头部
      for (Iterator propertyIterator = map.entrySet().iterator(); propertyIterator.hasNext();) {
        java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator.next();
        csvFileOutputStream
          .write(""+ (String) propertyEntry.getValue() != null ? (String) propertyEntry.getValue() : "");
        if (propertyIterator.hasNext()) {
          csvFileOutputStream.write(",");
        }
      }
      csvFileOutputStream.newLine();
      // 写入文件内容
      for (Iterator iterator = exportData.iterator(); iterator.hasNext();) {
        Object row = (Object) iterator.next();
        for (Iterator propertyIterator = map.entrySet().iterator(); propertyIterator
          .hasNext();) {
          java.util.Map.Entry propertyEntry = (java.util.Map.Entry) propertyIterator
            .next();
          if((String) BeanUtils.getProperty(row,(String) propertyEntry.getKey())!=null){
              csvFileOutputStream.write((String) BeanUtils.getProperty(row,(String) propertyEntry.getKey()));
          }
          if (propertyIterator.hasNext()) {
            csvFileOutputStream.write(",");
          }
        }
        if (iterator.hasNext()) {
          csvFileOutputStream.newLine();
        }
      }
      csvFileOutputStream.flush();
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        csvFileOutputStream.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
   
    /*
     *
     */
    response.setContentType("application/csv;charset=UTF-8");
    response.setHeader("Content-Disposition",
      "attachment; filename=" + URLEncoder.encode(fileName+".csv", "UTF-8"));
    InputStream in = null;
    try {
      in = new FileInputStream(csvFile.getPath());
      int len = 0;
      byte[] buffer = new byte[1024];
      response.setCharacterEncoding("UTF-8");
      OutputStream out = response.getOutputStream();
      while ((len = in.read(buffer)) > 0) {
        out.write(new byte[] { (byte) 0xEF, (byte) 0xBB, (byte) 0xBF });
        out.write(buffer, 0, len);
      }
      return ;
    } catch (FileNotFoundException e) {
      System.out.println(e);
    } finally {
      if (in != null) {
        try {
          in.close();
        } catch (Exception e) {
          throw new RuntimeException(e);
        }
      }
    }
  }

  /**
   * 下载文件
   * @param response
   * @param csvFilePath
   *       文件路径
   * @param fileName
   *       文件名称
* @return
   * @throws IOException
   */
  public static void exportFile(HttpServletResponse response, String csvFilePath, String fileName)
                                                  throws IOException {
    response.setContentType("application/csv;charset=UTF-8");
    response.setHeader("Content-Disposition",
      "attachment; filename=" + URLEncoder.encode(fileName+".csv", "UTF-8"));
    File file = new File(csvFilePath);
    //判断文件是否存在
    if (file.exists()) {
      File[] files = file.listFiles();
      for (int i = 0; i < files.length; i++) {
        if (files[i].isFile()) {
          if (files[i].getName().indexOf(fileName)!=-1) {
    InputStream in = null;
    try {
      in = new FileInputStream(files[i].getPath());
      int len = 0;
      byte[] buffer = new byte[1024];
      response.setCharacterEncoding("UTF-8");
      OutputStream out = response.getOutputStream();
      while ((len = in.read(buffer)) > 0) {
        out.write(new byte[] { (byte) 0xEF, (byte) 0xBB, (byte) 0xBF });
        out.write(buffer, 0, len);
      }
      return ;
    } catch (FileNotFoundException e) {
      System.out.println(e);
    } finally {
      if (in != null) {
        try {
          in.close();
        } catch (Exception e) {
          throw new RuntimeException(e);
        }
      }
    }
          }
        }
      }
    }
  }

  /**
   * 删除该目录filePath下的所有文件
   * @param filePath
   *      文件目录路径
   */
  public static void deleteFiles(String filePath) {
    File file = new File(filePath);
    if (file.exists()) {
      File[] files = file.listFiles();
      for (int i = 0; i < files.length; i++) {
        if (files[i].isFile()) {
          files[i].delete();
        }
      }
    }
  }

  /**
   * 删除单个文件
   * @param filePath
   *     文件目录路径
   * @param fileName
   *     文件名称
   */
  public static void deleteFile(String filePath, String fileName) {
    File file = new File(filePath);
    //判断文件是否存在
    if (file.exists()) {
      File[] files = file.listFiles();
      for (int i = 0; i < files.length; i++) {
        if (files[i].isFile()) {
          if (files[i].getName().indexOf(fileName)!=-1) {
            files[i].delete();
            return;
          }
        }
      }
    }
  }

}

前端代码：
exportOrders : function() {
var createTimeStart=$("input[name='createTimeStart']").val();
var createTimeEnd=$("input[name='createTimeEnd']").val();
var ordCd=$("input[name='ordCd']").val();
var thirdpartCd=$("input[name='thirdpartCd']").val();
var finshTimeStart=$("input[name='finshTimeStart']").val();
var finshTimeEnd=$("input[name='finshTimeEnd']").val();
var courierName=$("input[name='courierName']").val();
var promCd=$("input[name='promCd']").val();
var orderTypes=$("select[name='orderTypes'] option:selected").text();
var pharmProv=$("select[name='pharmProv'] option:selected").text();
var pharmCity=$("select[name='pharmCity'] option:selected").text();
var pharmCounty=$("select[name='pharmCounty'] option:selected").text();
var pharmacy=$("input[name='pharmacy']").val();
var currStatus=$("select[name='currStatus'] option:selected").text();


pharmProv =window.encodeURI(window.encodeURI(pharmProv));
pharmCity =window.encodeURI(window.encodeURI(pharmCity));
pharmCounty =window.encodeURI(window.encodeURI(pharmCounty));

// alert(createTimeStart);
// alert(createTimeEnd);
// alert(ordCd);
// alert(thirdpartCd);
// alert(finshTimeStart);
// alert(finshTimeEnd);
// alert(courierName);
// alert(promCd);
// alert(orderTypes);
// alert(pharmProv);
// alert(pharmCity);
// alert(pharmCounty);
// alert(pharmacy);
// alert(currStatus);

var url="/logistic/modules/order/csvGenerate?createTimeStart="+createTimeStart+"&createTimeEnd="+createTimeEnd+
            "&ordCd="+ordCd+"&thirdpartCd="+thirdpartCd+"&finshTimeStart="+finshTimeStart+"&finshTimeEnd="+finshTimeEnd+"&courierName="+courierName+"&promCd="+promCd+
            "&orderTypes="+orderTypes+"&pharmProv="+pharmProv+"&pharmCity="+pharmCity+"&pharmCounty="+pharmCounty+"&pharmacy="+pharmacy+"&asdcurrStatus="+currStatus;
//location.href=url;
$("#csvDown").attr("href",url);
        $("#csvdowns").click();
//         $.ajax({
//             type:"GET",
//             url:"/logistic/modules/order/csvGenerate?createTimeStart="+createTimeStart+"&createTimeEnd="+createTimeEnd+
//             "&ordCd="+ordCd+"&thirdpartCd="+thirdpartCd+"&finshTimeStart="+finshTimeStart+"&finshTimeEnd="+finshTimeEnd+"&courierName="+courierName+"&promCd="+promCd+
//             "&orderTypes="+orderTypes+"&pharmProv="+pharmProv+"&pharmCity="+pharmCity+"&pharmCounty="+pharmCounty+"&pharmacy="+pharmacy+"&asdcurrStatus="+currStatus,
//             dataType:"json",     
//             contentType:"application/json",              
//             success:function(msg){
//             $("#csvdown").click();
//           $.ajax({
//                    type:"GET",
//                  url:"/logistic/modules/order/csvDelete",
//                     dataType:"json",     
//                    contentType:"application/json",              
//                    success:function(msg){
//                    
//                    }
//                });
//             }
//          });
},


注意统一编码格式，改方法唯一缺陷为，下载 文件后，使用wps打开会有部分中文乱码，是有office则没问题


写的有点乱，仅供学习参考，谢谢