多文件打包下载以及单文件下载

今天项目中需要多文件打包下载和单文件下载的功能，以下做一些总结。

原代码：

  1 package com.hlbj.utils;
  2
  3 import java.io.File;
  4 import java.io.FileInputStream;
  5 import java.io.FileOutputStream;
  6 import java.io.InputStream;
  7 import java.io.OutputStream;
  8 import java.util.ArrayList;
  9 import java.util.List;
 10 import java.util.zip.ZipEntry;
 11 import java.util.zip.ZipOutputStream;
 12 import javax.servlet.http.HttpServletResponse;
 13 import org.apache.commons.lang3.StringUtils;
 14
 15 import com.app.core.common.Config;
 16 import com.hlbj.pdf.component.GeneratePdf;
 17
 18 public class DownLoadUitls {
 19         //图片地址
 20     private static String physicalPath = "";        //多文件压缩下载
 21     public static boolean downLoadPic(String filePathstr, String fileNamestr, HttpServletResponse response) {
 22         boolean isgood = false;
 23
 24         if (StringUtils.isBlank(filePathstr) || StringUtils.isBlank(fileNamestr)) {
 25             return isgood;
 26         }
 27
 28         String[] filePaths = filePathstr.split(",");
 29         String[] fileNames = fileNamestr.split(",");
 30
 31         if (filePaths == null || filePaths.length == 0 || fileNames == null || fileNames.length == 0) {
 32             return isgood;
 33         }
 34
 35         String classpath = "";
 36         if (StringUtils.isNoneBlank(physicalPath)) {
 37             classpath = physicalPath;
 38         } else {
 39             classpath = GeneratePdf.class.getClassLoader().getResource("").getPath();
 40             classpath = classpath.substring(0, classpath.lastIndexOf("hlbj_api") - 1);
 41         }
 42
 43         List<FileInputStream> inputs = new ArrayList<FileInputStream>();
 44         try {
 45             for (String path : filePaths) {
 46                 String str = classpath + path.substring(path.indexOf("/s4m3files"));
 47                 File file = new File(str);
 48                 if (file.exists()) {
 49                     FileInputStream input = new FileInputStream(file);
 50                     inputs.add(input);
 51                 }
 52             }
 53
 54             // ZIP打包图片
 55             String downPath = classpath + "/images.zip";
 56             File zipFile = new File(downPath);
 57             byte[] buf = new byte[1024];
 58             int len;
 59             ZipOutputStream zout = new ZipOutputStream(new FileOutputStream(zipFile));
 60             for (int i = 0; i < inputs.size(); i++) {
 61                 FileInputStream in = inputs.get(i);
 62                 zout.putNextEntry(new ZipEntry(fileNames[i]));
 63                 while ((len = in.read(buf)) > 0) {
 64                     zout.write(buf, 0, len);
 65                 }
 66                 zout.closeEntry();
 67                 in.close();
 68             }
 69             zout.close();
 70
 71             // 下载图片
 72             FileInputStream zipInput = new FileInputStream(zipFile);
 73             OutputStream out = response.getOutputStream();
 74             response.setContentType("application/octet-stream");
 75             response.setHeader("Content-Disposition", "attachment; filename=images.zip");
 76             while ((len = zipInput.read(buf)) != -1) {
 77                 out.write(buf, 0, len);
 78             }
 79             zipInput.close();
 80             out.flush();
 81             out.close();
 82             // 删除压缩包
 83             zipFile.delete();
 84             isgood = true;
 85         } catch (Exception e) {
 86             // TODO Auto-generated catch block
 87             e.printStackTrace();
 88         }
 89
 90         return isgood;
 91     }
 92     //单文件下载
 93     public static void downLoadPdf(String filePathstr, HttpServletResponse response) {
 94         String classpath = "";
 95         if (StringUtils.isNoneBlank(physicalPath)) {
 96             classpath = physicalPath;
 97         } else {
 98             classpath = GeneratePdf.class.getClassLoader().getResource("").getPath();
 99             classpath = classpath.substring(0, classpath.lastIndexOf("hlbj_api") - 1);
100         }
101         filePathstr= classpath + filePathstr.substring(filePathstr.indexOf("/pdf"));
102         // 下载本地文件
103         // path是指欲下载的文件的路径。
104         File file = new File(filePathstr);
105         // 取得文件名。
106         String filename = file.getName();
107         // 读到流中
108         InputStream inStream;
109
110
111         try {
112             inStream = new FileInputStream(filePathstr);
113             // 设置输出的格式
114             response.reset();
115             response.setContentType("bin");
116             response.addHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
117             // 循环取出流中的数据
118             byte[] b = new byte[100];
119             int len;
120             while ((len = inStream.read(b)) > 0){
121                 response.getOutputStream().write(b, 0, len);
122             }
123             inStream.close();
124         } catch (Exception e1) {
125             // TODO Auto-generated catch block
126             e1.printStackTrace();
127         } // 文件的存放路径
128     }
129 }

原文地址：https://www.cnblogs.com/huanlingjisi/p/9082607.html