压缩解压文件代码,Java代码库,德仔网

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【Java】压缩解压文件
作者:liangjw0504 / 发布于2015/9/22/ 737

	package com.util;
	
	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.URL;
	import java.util.Enumeration;
	import java.util.zip.CRC32;
	import java.util.zip.CheckedOutputStream;
	import java.util.zip.ZipEntry;
	import java.util.zip.ZipFile;
	import java.util.zip.ZipOutputStream;
	
	import javax.servlet.ServletContext;
	import javax.servlet.http.HttpServlet;
	
	
	/**
	* 解压缩文件
	*
	*/
	
	
	public class Zip extends HttpServlet {
	 /**
	 *
	 */
	 private static final long serialVersionUID = 5142373267185568029L;
	
	
	
	 /**
	 * 压缩文件为zip格式
	 *
	 * @paramzipFile 压缩文件后的文件名
	 * @paramsrcPathName 待压缩文件
	 * @throws IOException
	 * 文件不存在异常
	 */
	 public static void zipFile(String srcPathName) throws IOException {
	
	 File file = new File(srcPathName);
	 if (!file.exists())
	 throw new RuntimeException(srcPathName + "not exist!");
	 //System.out.println(srcPathName);
	 FileOutputStream fileOutputStream = new FileOutputStream(srcPathName+".zip");
	
	 CheckedOutputStream cos = new CheckedOutputStream(fileOutputStream, new CRC32());
	 ZipOutputStream out = new ZipOutputStream(cos);
	 String basedir = "";
	 compress(file, out, basedir);
	 out.flush();
	 out.close();
	 }
	
	 private static void compress(File file, ZipOutputStream out, String basedir) throws IOException {
	 if (file.isDirectory()) {
	 compressDirectory(file, out, basedir);
	 } else {
	 compressFile(file, out, basedir);
	 }
	 }
	
	 private static void compressDirectory(File dir, ZipOutputStream out, String basedir) throws IOException {
	 if (!dir.exists())
	 return;
	 File[] files = dir.listFiles();
	 for (int i = 0; i < files.length; i++) {
	 compress(files[i], out, basedir + dir.getName() + "/");
	 }
	 }
	
	 private static void compressFile(File file, ZipOutputStream out, String basedir) throws IOException {
	 if (!file.exists()) {
	 return;
	 }
	 BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
	 ZipEntry entry = new ZipEntry(basedir + file.getName());
	 out.putNextEntry(entry);
	 int len = 0;
	 byte data[] = new byte[1024];
	 while ((len = bis.read(data)) != -1) {
	 out.write(data, 0, len);
	 }
	 bis.close();
	 }
	
	 private static void createDir(String path) {
	 File dir = new File(path);
	 if (dir.exists() == false)
	 dir.mkdir();
	 }
	
	 private static String getSuffixName(String name) {
	 return name.substring(0, name.lastIndexOf("."));
	 }
	
	 /**
	 * 解压缩文件
	 * @throws IOException
	 * 文件读写异常
	 */
	 public static void unZip(String zipFilePath) throws IOException {
	 File file = new File(zipFilePath+".zip");
	 ZipFile zipFile = new ZipFile(file);
	
	 File unzipFile = new File(zipFilePath);
	 if (unzipFile.exists())
	 unzipFile.delete();
	 unzipFile.mkdirs();
	
	 Enumeration zipEnum = zipFile.entries();
	 InputStream input = null;
	 OutputStream output = null;
	 ZipEntry entry = null;
	 while (zipEnum.hasMoreElements()) {
	 entry = (ZipEntry) zipEnum.nextElement();
	 String entryName = new String(entry.getName());
	 String names[] = entryName.split("\\/");
	 int length = names.length;
	 String path = unzipFile.getAbsolutePath();
	 for (int v = 0; v < length; v++) {
	 if (v < length - 1) {
	 path += "/" + names[v] + "/";
	 createDir(path);
	 } else {
	 if (entryName.endsWith("/"))
	 createDir(unzipFile.getAbsolutePath() + "/" + entryName);
	 else {
	 input = zipFile.getInputStream(entry);
	 output = new FileOutputStream(new File(unzipFile.getAbsolutePath() + "/" + entryName));
	 byte[] buffer = new byte[1024 * 8];
	 int readLen = 0;
	 while ((readLen = input.read(buffer, 0, 1024 * 8)) != -1)
	 output.write(buffer, 0, readLen);
	 input.close();
	 output.flush();
	 output.close();
	 }
	 }
	 }
	 }
	 }
	
	
	
	
	 public static void main(String[] args) {
	
	 Zip zip=new Zip();
	
	 //String path=zip.getClassPath();//System.getProperty("user.dir");
	
	
	 try {
	 String path=zip.findServerPath();
	 //System.out.println(path);
	 //压缩
	 //zip.zipFile(path+"testzip");//路径+文件名
	 // 解压
	 //zip.unZip(path+"testzip");
	 } catch (Exception e) {
	 // TODO Auto-generated catch block
	 e.printStackTrace();
	 }
	
	 }
	
	
	 /**
	 * 获取服务器端的webapps路径
	 * @return
	 */
	 public String findServerPath() throws Exception{
	 String path=this.getServletContext().getRealPath("/");
	 return path;
	 }
	
	
	
	 /**
	 * 得到本类物理路径所在文件夹
	 * @return
	 */
	 private String getClassPath()throws Exception{
	 String strClassName = getClass().getName();
	 String strPackageName = "";
	 if(getClass().getPackage() != null) {
	 strPackageName = getClass().getPackage().getName();
	 }
	 String strClassFileName = "";
	 if(!"".equals(strPackageName)){
	 strClassFileName = strClassName.substring(strPackageName.length() + 1,strClassName.length());
	 }
	 else {
	 strClassFileName = strClassName;
	 }
	 URL url = null;
	 url = getClass().getResource(strClassFileName + ".class");
	 String strURL = url.toString();
	 //String middleString = System.getProperty("file.separator"); // 取得操作系统路径分割符
	 strURL = strURL.substring(strURL.indexOf( "/" ) + 1,strURL.lastIndexOf( "/" ));
	 return strURL;
	 }
	
	
	}
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