java实现文件压缩成zip的工具类

package com.tax.core.util;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.util.ArrayList;import java.util.List;import java.util.zip.ZipEntry;import java.util.zip.ZipOutputStream;/*** ZipUtils* @author GDL* @date 2017年11月20日* @version v1.0*/public class ZipUtils {private static final int BUFFER_SIZE = 2 * 1024;/*** 压缩成ZIP 方法1* @param srcDir 压缩文件夹路径* @param out 压缩文件输出流* @param KeepDirStructure 是否保留原来的目录结构,true:保留目录结构;* false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)* @throws RuntimeException 压缩失败会抛出运行时异常*/public static void toZip(String srcDir, OutputStream out, boolean KeepDirStructure)throws RuntimeException{long start = System.currentTimeMillis();ZipOutputStream zos = null ;try {zos = new ZipOutputStream(out);File sourceFile = new File(srcDir);compress(sourceFile,zos,sourceFile.getName(),KeepDirStructure);long end = System.currentTimeMillis();System.out.println("压缩完成，耗时：" + (end - start) +" ms");} catch (Exception e) {throw new RuntimeException("zip error from ZipUtils",e);}finally{if(zos != null){try {zos.close();} catch (IOException e) {e.printStackTrace();}}}}/*** 压缩成ZIP 方法2* @param srcFiles 需要压缩的文件列表* @param out 压缩文件输出流* @throws RuntimeException 压缩失败会抛出运行时异常*/public static void toZip(List<File> srcFiles , OutputStream out)throws RuntimeException {long start = System.currentTimeMillis();ZipOutputStream zos = null ;try {zos = new ZipOutputStream(out);for (File srcFile : srcFiles) {byte[] buf = new byte[BUFFER_SIZE];zos.putNextEntry(new ZipEntry(srcFile.getName()));int len;FileInputStream in = new FileInputStream(srcFile);while ((len = in.read(buf)) != -1){zos.write(buf, 0, len);}zos.closeEntry();in.close();}long end = System.currentTimeMillis();System.out.println("压缩完成，耗时：" + (end - start) +" ms");} catch (Exception e) {throw new RuntimeException("zip error from ZipUtils",e);}finally{if(zos != null){try {zos.close();} catch (IOException e) {e.printStackTrace();}}}}/*** 递归压缩方法* @param sourceFile 源文件* @param zos zip输出流* @param name 压缩后的名称* @param KeepDirStructure 是否保留原来的目录结构,true:保留目录结构;* false:所有文件跑到压缩包根目录下(注意：不保留目录结构可能会出现同名文件,会压缩失败)* @throws Exception*/private static void compress(File sourceFile, ZipOutputStream zos, String name,boolean KeepDirStructure) throws Exception{byte[] buf = new byte[BUFFER_SIZE];if(sourceFile.isFile()){// 向zip输出流中添加一个zip实体，构造器中name为zip实体的文件的名字zos.putNextEntry(new ZipEntry(name));// copy文件到zip输出流中int len;FileInputStream in = new FileInputStream(sourceFile);while ((len = in.read(buf)) != -1){zos.write(buf, 0, len);}// Complete the entryzos.closeEntry();in.close();} else {File[] listFiles = sourceFile.listFiles();if(listFiles == null || listFiles.length == 0){// 需要保留原来的文件结构时,需要对空文件夹进行处理if(KeepDirStructure){// 空文件夹的处理zos.putNextEntry(new ZipEntry(name + "/"));// 没有文件，不需要文件的copyzos.closeEntry();}}else {for (File file : listFiles) {// 判断是否需要保留原来的文件结构if (KeepDirStructure) {// 注意：file.getName()前面需要带上父文件夹的名字加一斜杠,// 不然最后压缩包中就不能保留原来的文件结构,即：所有文件都跑到压缩包根目录下了compress(file, zos, name + "/" + file.getName(),KeepDirStructure);} else {compress(file, zos, file.getName(),KeepDirStructure);}}}}}public static void main(String[] args) throws Exception {/** 测试压缩方法1 */FileOutputStream fos1 = new FileOutputStream(new File("c:/mytest01.zip"));ZipUtils.toZip("D:/log", fos1,true);/** 测试压缩方法2 */List<File> fileList = new ArrayList<>();fileList.add(new File("D:/Java/jdk1.7.0_45_64bit/bin/jar.exe"));fileList.add(new File("D:/Java/jdk1.7.0_45_64bit/bin/java.exe"));FileOutputStream fos2 = new FileOutputStream(new File("c:/mytest02.zip"));ZipUtils.toZip(fileList, fos2);}}

if(userList.size() > 0){/** 下面为下载zip压缩包相关流程 */HttpServletRequest request = ServletActionContext.getRequest();FileWriter writer;/** 1.创建临时文件夹 */String rootPath = request.getSession().getServletContext().getRealPath("/");File temDir = new File(rootPath + "/" + UUID.randomUUID().toString().replaceAll("-", ""));if(!temDir.exists()){temDir.mkdirs();}/** 2.生成需要下载的文件，存放在临时文件夹内 */// 这里我们直接来10个内容相同的文件为例，但这个10个文件名不可以相同for (int i = 0; i < 10; i++) {dataMap.put("userList", userList);Map<String, String> endMap = new HashMap<>();endMap.put("user", "老王");endMap.put("time", "2017-10-10 10:50:55");dataMap.put("endMap", endMap);Configuration cfg = new Configuration(Configuration.VERSION_2_3_22);cfg.setServletContextForTemplateLoading(ServletActionContext.getServletContext(), "/ftl");Template template = cfg.getTemplate("exportExcel.ftl");writer = new FileWriter(temDir.getPath()+"/excel"+ i +".xls");template.process(dataMap, writer);writer.flush();writer.close();}/** 3.设置response的header */HttpServletResponse response = ServletActionContext.getResponse();response.setContentType("application/zip");response.setHeader("Content-Disposition", "attachment; filename=excel.zip");/** 4.调用工具类，下载zip压缩包 */// 这里我们不需要保留目录结构ZipUtils.toZip(temDir.getPath(), response.getOutputStream(),false);/** 5.删除临时文件和文件夹 */// 这里我没写递归，直接就这样删除了File[] listFiles = temDir.listFiles();for (int i = 0; i < listFiles.length; i++) {listFiles[i].delete();}temDir.delete();}