1 package com.charmyin.cmstudio.common.utils; 2  3 import java.io.BufferedInputStream; 4 import java.io.BufferedOutputStream; 5 import java.io.File; 6 import java.io.FileInputStream; 7 import java.io.IOException; 8 import java.io.InputStream; 9 import java.io.OutputStream;10 11 import javax.servlet.http.HttpServletResponse;12 13 public class DownLoadExcelUtil {14 15     16     public static void downLoadFile(String filePath, HttpServletResponse response, String fileName, String fileType)17             throws Exception {18             File file = new File(filePath);  //根据文件路径获得File文件19             //设置文件类型(这样设置就不止是下Excel文件了，一举多得)20             if("pdf".equals(fileType)){21                response.setContentType("application/pdf;charset=GBK");22             }else if("xls".equals(fileType)){23                response.setContentType("application/msexcel;charset=GBK");24             }else if("doc".equals(fileType)){25                response.setContentType("application/msword;charset=GBK");26             }27             //文件名28             response.setHeader("Content-Disposition", "attachment;filename=\""29                 + new String(fileName.getBytes(), "ISO8859-1") + "\"");30             response.setContentLength((int) file.length());31             byte[] buffer = new byte[4096];// 缓冲区32             BufferedOutputStream output = null;33             BufferedInputStream input = null;34             try {35               output = new BufferedOutputStream(response.getOutputStream());36               input = new BufferedInputStream(new FileInputStream(file));37               int n = -1;38               //遍历，开始下载39               while ((n = input.read(buffer, 0, 4096)) > -1) {40                  output.write(buffer, 0, n);41               }42               output.flush();   //不可少43               response.flushBuffer();//不可少44             } catch (Exception e) {45               //异常自己捕捉       46             } finally {47                //关闭流，不可少48                if (input != null)49                     input.close();50                if (output != null)51                     output.close();52             }53         }54     55      public static HttpServletResponse download(String path, HttpServletResponse response) {56             try {57                 // path是指欲下载的文件的路径。58                 File file = new File(path);59                 // 取得文件名。60                 String filename = file.getName();61                 // 取得文件的后缀名。62                 String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();63 64                 // 以流的形式下载文件。65                 InputStream fis = new BufferedInputStream(new FileInputStream(path));66                 byte[] buffer = new byte[fis.available()];67                 fis.read(buffer);68                 fis.close();69                 // 清空response70                 response.reset();71                 // 设置response的Header72                 response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));73                 response.addHeader("Content-Length", "" + file.length());74                 OutputStream toClient = new BufferedOutputStream(response.getOutputStream());75                 response.setContentType("application/octet-stream");76                 toClient.write(buffer);77                 toClient.flush();78                 toClient.close();79             } catch (IOException ex) {80                 ex.printStackTrace();81             }82             return response;83         }84 }