本文主要是介绍Java多个文件根据URL下载后打包zip导出，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
该示例框架为Spring Boot，根据Url把多个文件下载到指定的文件夹目录，然后再将文件夹目录打包成zip导出，有个简单的导出html页面，点击导出按钮下载zip
所需jar包commons-io
service层
package com.test.service;import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;public class Test {private static Logger logger = LoggerFactory.getLogger(Test.class);/*** 需要压缩的文件夹*/private final static String downloadDir = "download";/*** 打包后的文件夹*/private final static String downloadZip = "downloadZip";/*** 通过图片url下载图片到指定文件夹* @param downloadUrl 图片url*/public void downloadFile(String downloadUrl) {InputStream inputStream = null;OutputStream outputStream = null;try {//获取连接URL url=new URL(downloadUrl);HttpURLConnection connection=(HttpURLConnection)url.openConnection();connection.setConnectTimeout(3*1000);//设置请求头connection.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.110 Safari/537.36");//获取输入流inputStream=connection.getInputStream();File fileDir=new File(downloadDir);if(!fileDir.exists()){//如果文件夹不存在fileDir.mkdir();//创建文件夹}//截取文件名称，可以把 / 换成需要的规则String filePath = downloadDir+"/" + downloadUrl.substring(downloadUrl.lastIndexOf("/"));File file = new File(filePath);file.createNewFile();//创建文件，存在覆盖outputStream = new FileOutputStream(file);int len = 0;byte[] buf = new byte[1024];while ((len = inputStream.read(buf, 0, 1024)) != -1) {outputStream.write(buf, 0, len);}outputStream.flush();} catch (Exception e) {logger.error("文件下载出错：" + e);} finally {try {if (inputStream != null) {inputStream.close();}if (outputStream != null) {outputStream.close();}} catch (IOException e) {logger.error("关闭流出错：" + e);}}}/*** 下载压缩包*/public void downloadZip(HttpServletRequest request,HttpServletResponse res) throws IOException {OutputStream out = null;File zip = null;try{//多个文件进行压缩，批量打包下载文件 //创建压缩文件需要的空的zip包 String zipName = "测试压缩包.zip";String zipFilePath = downloadZip+File.separator+zipName; File fileDir=new File(downloadZip);if(!fileDir.exists()){//如果文件夹不存在fileDir.mkdir();//创建文件夹}//压缩文件zip = new File(zipFilePath); zip.createNewFile();//创建文件，存在覆盖//创建zip文件输出流 ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(zip));this.zipFile(downloadDir, zos);zos.close();//将打包后的文件写到客户端，输出的方法同上，使用缓冲流输出 BufferedInputStream bis = new BufferedInputStream(new FileInputStream(zipFilePath)); byte[] buff = new byte[bis.available()]; bis.read(buff);bis.close();//IO流实现下载的功能 res.setCharacterEncoding("UTF-8"); //设置编码字符res.setContentType("application/octet-stream;charset=UTF-8"); //设置下载内容类型application/octet-stream（二进制流，未知文件类型）；//防止文件名乱码String userAgent = request.getHeader("USER-AGENT");if (userAgent.contains("Firefox") || userAgent.contains("firefox")) {//火狐浏览器zipName = new String(zipName.getBytes(), "ISO8859-1");} else {zipName = URLEncoder.encode(zipName, "UTF-8");//其他浏览器}res.setHeader("Content-disposition", "attachment;filename="+zipName);//设置下载的压缩文件名称out = res.getOutputStream(); //创建页面返回方式为输出流，会自动弹出下载框 out.write(buff);//输出数据文件}catch(Exception e) {logger.error("压缩包下载出错：" + e);}finally {if(out != null){out.flush();//释放缓存out.close();//关闭输出流}//下载完后删除文件夹和压缩包
// File fileDir = new File(downloadDir);
// FileUtils.deleteDirectory(fileDir);
//
// if(zip != null){
// zip.delete();
// }}}/*** 压缩文件* @param filePath 需要压缩的文件夹* @param zos zip文件输出流 */private void zipFile(String filePath,ZipOutputStream zos) throws IOException {File inputFile = new File(filePath); //根据文件路径创建文件 if(inputFile.exists()) { //判断文件是否存在 if (inputFile.isFile()) { //判断是否属于文件，还是文件夹 //创建输入流读取文件 BufferedInputStream bis = new BufferedInputStream(new FileInputStream(inputFile)); //将文件写入zip内，即将文件进行打包 zos.putNextEntry(new ZipEntry(inputFile.getName())); //写入文件的方法，同上 int size = 0; byte[] buffer = new byte[1024]; //设置读取数据缓存大小while ((size = bis.read(buffer)) > 0) { zos.write(buffer, 0, size); } //关闭输入输出流 zos.closeEntry(); bis.close(); } else { //如果是文件夹，则使用穷举的方法获取文件，写入zip try { File[] files = inputFile.listFiles(); for (File fileTem:files) { zipFile(fileTem.toString(),zos);} } catch (Exception e) { logger.error("压缩文件出错：" + e);} } } }
}
controller层
package com.test.controller;import java.io.IOException;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;import com.test.service.Test;@RestController
@RequestMapping("/test")
public class TestController {@Autowiredprivate HttpServletRequest request;@Autowiredprivate HttpServletResponse response;@RequestMapping(value = "dc", method = RequestMethod.GET)public void syncAll() {try {//模拟从数据库查出多张图片路径String[] urlArr = new String[]{"https://ss2.bdstatic.com/70cFvnSh_Q1YnxGkpoWK1HF6hhy/it/u=2069658043,3652854281&fm=26&gp=0.jpg","https://ss1.bdstatic.com/70cFuXSh_Q1YnxGkpoWK1HF6hhy/it/u=1569705026,760128093&fm=26&gp=0.jpg"};Test test = new Test();for (String url : urlArr) {//下载查出的图片test.downloadFile(url);}//把下载的图片文件夹压缩test.downloadZip(request, response);} catch (IOException e) {e.printStackTrace();}}}
maven
<dependency><groupId>org.apache.commons</groupId><artifactId>commons-io</artifactId><version>1.3.2</version></dependency>html测试导出页面
<!DOCTYPE html>
<html><head><title>测试文件压缩导出</title><meta name="keywords" content="keyword1,keyword2,keyword3"><meta name="description" content="this is my page"><meta name="content-type" content="text/html; charset=UTF-8"></head><body style="font-size: 3em;"><a href="http://localhost:8080/test/dc">导出</a></body>
</html>
源码下载：https://download.csdn.net/download/u011974797/16685844
分割线--------------------------------------------------------------------------------------------------------------------------
扩展：前面的是压缩目录下的所有文件，如果需要压缩目录下的子目录和文件，可以参考下面的代码
package com.test.service;import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;/*** 压缩子目录和文件*/
public class FileTest {private static Logger logger = LoggerFactory.getLogger(FileTest.class);/*** 需要压缩的文件夹*/private final static String downloadDir = "download";/*** 打包后的文件夹*/private final static String downloadZip = "downloadZip";/*** 通过图片url下载图片到指定文件夹* @param downloadUrl 图片url*/public void downloadFile(String downloadUrl, String fileName) {InputStream inputStream = null;OutputStream outputStream = null;try {//获取连接URL url=new URL(downloadUrl);HttpURLConnection connection=(HttpURLConnection)url.openConnection();connection.setConnectTimeout(3*1000);//设置请求头connection.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.110 Safari/537.36");//获取输入流inputStream=connection.getInputStream();File fileDir=new File(downloadDir);if(!fileDir.exists()){//如果文件夹不存在fileDir.mkdir();//创建文件夹}//截取文件名称，可以把 / 换成需要的规则String filePath = downloadDir+"/" + fileName+downloadUrl.substring(downloadUrl.lastIndexOf("."));File file = new File(filePath);file.createNewFile();//创建文件，存在覆盖outputStream = new FileOutputStream(file);int len = 0;byte[] buf = new byte[1024];while ((len = inputStream.read(buf, 0, 1024)) != -1) {outputStream.write(buf, 0, len);}outputStream.flush();} catch (Exception e) {logger.error("文件下载出错：" + e);} finally {try {if (inputStream != null) {inputStream.close();}if (outputStream != null) {outputStream.close();}} catch (IOException e) {logger.error("关闭流出错：" + e);}}}/*** 下载压缩包*/public void downloadZip(HttpServletRequest request,HttpServletResponse res) throws IOException {OutputStream out = null;File zip = null;try{//多个文件进行压缩，批量打包下载文件 //创建压缩文件需要的空的zip包 String zipName = "测试压缩包.zip";String zipFilePath = downloadZip+File.separator+zipName; File fileDir=new File(downloadZip);if(!fileDir.exists()){//如果文件夹不存在fileDir.mkdir();//创建文件夹}//压缩文件zip = new File(zipFilePath); zip.createNewFile();//创建文件，存在覆盖//创建zip文件输出流 ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(zip));File inputFile = new File(downloadDir); //根据文件路径创建文件 File[] fileLists = inputFile.listFiles(); // 如果是目录，获取该目录下的内容集合//压缩这个目录下所有内容，包括文件夹和文件，只压缩下级目录，下下级需要自己扩展for (int i = 0; i < fileLists.length; i++) { // 循环遍历这个集合内容if (fileLists[i].isDirectory()) { //判断元素是不是一个目录//如果存在目录，压缩子目录this.zipFile(fileLists[i], zos, fileLists[i].getName());}else{//压缩文件，不需要目录名称传空this.zipFile(fileLists[i], zos, "");}}zos.close();//将打包后的文件写到客户端，输出的方法同上，使用缓冲流输出 BufferedInputStream bis = new BufferedInputStream(new FileInputStream(zipFilePath)); byte[] buff = new byte[bis.available()]; bis.read(buff);bis.close();//IO流实现下载的功能 res.setCharacterEncoding("UTF-8"); //设置编码字符res.setContentType("application/octet-stream;charset=UTF-8"); //设置下载内容类型application/octet-stream（二进制流，未知文件类型）；//防止文件名乱码String userAgent = request.getHeader("USER-AGENT");if (userAgent.contains("Firefox") || userAgent.contains("firefox")) {//火狐浏览器zipName = new String(zipName.getBytes(), "ISO8859-1");} else {zipName = URLEncoder.encode(zipName, "UTF-8");//其他浏览器}res.setHeader("Content-disposition", "attachment;filename="+zipName);//设置下载的压缩文件名称out = res.getOutputStream(); //创建页面返回方式为输出流，会自动弹出下载框 out.write(buff);//输出数据文件}catch(Exception e) {logger.error("压缩包下载出错：" + e);}finally {if(out != null){out.flush();//释放缓存out.close();//关闭输出流}//下载完后删除文件夹和压缩包
// File fileDir = new File(downloadDir);
// FileUtils.deleteDirectory(fileDir);
//
// if(zip != null){
// zip.delete();
// }}}/*** 压缩文件* @param filePath 需要压缩的文件夹* @param zos zip文件输出流 * @param folderName 文件夹名称，用于压缩子目录*/private void zipFile(File inputFile,ZipOutputStream zos,String folderName) throws IOException {if(inputFile.exists()) { //判断文件是否存在 if (inputFile.isFile()) { //判断是否属于文件，还是文件夹 //创建输入流读取文件 BufferedInputStream bis = new BufferedInputStream(new FileInputStream(inputFile)); //将文件写入zip内，即将文件进行打包 zos.putNextEntry(new ZipEntry(folderName+inputFile.getName())); //写入文件的方法，同上 int size = 0; byte[] buffer = new byte[1024]; //设置读取数据缓存大小while ((size = bis.read(buffer)) > 0) { zos.write(buffer, 0, size); } //关闭输入输出流 zos.closeEntry(); bis.close(); } else { //如果是文件夹，则使用穷举的方法获取文件，写入zip try { File[] files = inputFile.listFiles(); for (File fileTem:files) { zipFile(fileTem, zos, folderName + "/");} } catch (Exception e) { logger.error("压缩文件出错：" + e);} } } }
}
关键代码部分
//将文件写入zip内，即将文件进行打包
zos.putNextEntry(new ZipEntry(folderName+inputFile.getName())); 前面加了个folderName文件夹名称，比如之前是：图片.jpg，那么 图片.jpg 就会压缩到根目录下，如果加上文件夹名称：test/图片.jpg，那么 图片.jpg 就会压缩到子目录test下面
如果需要压缩一级、二级、三级所有层级目录，那么需要先遍历出来，然后同理压缩即可
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