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;/*** 壓縮成ZIP 方法1* @param srcDir 壓縮文件夾路徑* @param out 壓縮文件輸出流* @param KeepDirStructure 是否保留原來的目錄結構,true:保留目錄結構;* false:所有文件跑到壓縮包根目錄下(注意：不保留目錄結構可能會出現同名文件,會壓縮失敗)* @throws RuntimeException 壓縮失敗會拋出運行時異常*/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("壓縮完成，耗時：" + (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();}}}}/*** 壓縮成ZIP 方法2* @param srcFiles 需要壓縮的文件列表* @param out 壓縮文件輸出流* @throws RuntimeException 壓縮失敗會拋出運行時異常*/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("壓縮完成，耗時：" + (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();}}}}/*** 遞歸壓縮方法* @param sourceFile 源文件* @param zos zip輸出流* @param name 壓縮后的名稱* @param KeepDirStructure 是否保留原來的目錄結構,true:保留目錄結構;* false:所有文件跑到壓縮包根目錄下(注意：不保留目錄結構可能會出現同名文件,會壓縮失敗)* @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輸出流中添加一個zip實體，構造器中name為zip實體的文件的名字zos.putNextEntry(new ZipEntry(name));// copy文件到zip輸出流中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){// 需要保留原來的文件結構時,需要對空文件夾進行處理if(KeepDirStructure){// 空文件夾的處理zos.putNextEntry(new ZipEntry(name + "/"));// 沒有文件，不需要文件的copyzos.closeEntry();}}else {for (File file : listFiles) {// 判斷是否需要保留原來的文件結構if (KeepDirStructure) {// 注意：file.getName()前面需要帶上父文件夾的名字加一斜杠,// 不然最后壓縮包中就不能保留原來的文件結構,即：所有文件都跑到壓縮包根目錄下了compress(file, zos, name + "/" + file.getName(),KeepDirStructure);} else {compress(file, zos, file.getName(),KeepDirStructure);}}}}}public static void main(String[] args) throws Exception {/** 測試壓縮方法1 */FileOutputStream fos1 = new FileOutputStream(new File("c:/mytest01.zip"));ZipUtils.toZip("D:/log", fos1,true);/** 測試壓縮方法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){/** 下面為下載zip壓縮包相關流程 */HttpServletRequest request = ServletActionContext.getRequest();FileWriter writer;/** 1.創建臨時文件夾 */String rootPath = request.getSession().getServletContext().getRealPath("/");File temDir = new File(rootPath + "/" + UUID.randomUUID().toString().replaceAll("-", ""));if(!temDir.exists()){temDir.mkdirs();}/** 2.生成需要下載的文件，存放在臨時文件夾內 */// 這里我們直接來10個內容相同的文件為例，但這個10個文件名不可以相同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.設置response的header */HttpServletResponse response = ServletActionContext.getResponse();response.setContentType("application/zip");response.setHeader("Content-Disposition", "attachment; filename=excel.zip");/** 4.調用工具類，下載zip壓縮包 */// 這里我們不需要保留目錄結構ZipUtils.toZip(temDir.getPath(), response.getOutputStream(),false);/** 5.刪除臨時文件和文件夾 */// 這里我沒寫遞歸，直接就這樣刪除了File[] listFiles = temDir.listFiles();for (int i = 0; i < listFiles.length; i++) {listFiles[i].delete();}temDir.delete();}