java解压zip rar文件实例

摘要: java解压zip rar文件实例

package com.tservice.mrn.common;

import java.io.*;
import java.util.Enumeration;

import org.apache.tools.ant.Project;
import org.apache.tools.ant.taskdefs.Expand;
import org.apache.tools.zip.*;

import com.github.junrar.Archive;
import com.github.junrar.rarfile.FileHeader;

public abstract class ZipUtils {

private static final int BUFFEREDSIZE = 1024;

/**
* @SuppressWarnings({ "rawtypes", "resource" }) public static String
* unzip(File zipFile, String unzipDir, String
* zipFileName) throws IOException { ZipFile zf = new
* ZipFile(zipFile); Enumeration enu = zf.entries();
* String result = ""; while (enu.hasMoreElements()) {
* ZipEntry entry = (ZipEntry) enu.nextElement(); String
* name = entry.getName(); //
* 如果解压entry是目录，直接生成目录即可，不用写入，如果是文件，要将文件写入 String
* pathParent = unzipDir + "/" + zipFileName; if (!(new
* File(pathParent).exists())) new
* File(pathParent).mkdirs(); String path = pathParent +
* "/" + name; result = result + path + "<br/>
* "; File file = new File(path); if
* (entry.isDirectory()) { file.mkdir(); } else { //
* 
3ff0
; 建议使用如下方式创建流和读取字节，不然会有乱码 InputStream is =
* zf.getInputStream(entry); byte[] buf1 = new
* byte[1024]; int len; if (!file.exists()) {
* file.getParentFile().mkdirs(); file.createNewFile();
* } OutputStream out = new FileOutputStream(file);
* while ((len = is.read(buf1)) > 0) { String buf = new
* String(buf1, 0, len); out.write(buf1, 0, len); } } }
* result = "文件解压成功，解压文件：/n" + result; return result; }
**/

/**
* 解压zip或者rar包的内容到指定的目录下，可以处理其文件夹下包含子文件夹的情况
*
* @param zipFilename
* 要解压的zip或者rar包文件
* @param outputDirectory
* 解压后存放的目录
*
*/
public static void unzipZipRar(String zipFilename, String outputDirectory)
throws Exception {
File outFile = new File(outputDirectory);
if (!outFile.exists()) {
outFile.mkdirs();
}

ZipFile zipFile = new ZipFile(zipFilename);
@SuppressWarnings("rawtypes")
Enumeration en = zipFile.getEntries();
ZipEntry zipEntry = null;
while (en.hasMoreElements()) {
zipEntry = (ZipEntry) en.nextElement();
if (zipEntry.isDirectory()) {
// mkdir directory
String dirName = zipEntry.getName();
// System.out.println("=dirName is:=" + dirName + "=end=");
dirName = dirName.substring(0, dirName.length() - 1);
File f = new File(outFile.getPath() + File.separator + dirName);
f.mkdirs();
} else {
// unzip file
String strFilePath = outFile.getPath() + File.separator
+ zipEntry.getName();
File f = new File(strFilePath);

// 判断文件不存在的话，就创建该文件所在文件夹的目录
if (!f.exists()) {
String[] arrFolderName = zipEntry.getName().split("/");
String strRealFolder = "";
for (int i = 0; i < (arrFolderName.length - 1); i++) {
strRealFolder += arrFolderName[i] + File.separator;
}
strRealFolder = outFile.getPath() + File.separator
+ strRealFolder;
File tempDir = new File(strRealFolder);
// 此处使用.mkdirs()方法，而不能用.mkdir()
tempDir.mkdirs();
}
// the codes remedified by can_do on 2010-07-02 =end=
f.createNewFile();
InputStream in = zipFile.getInputStream(zipEntry);
FileOutputStream out = new FileOutputStream(f);
try {
int c;
byte[] by = new byte[BUFFEREDSIZE];
while ((c = in.read(by)) != -1) {
out.write(by, 0, c);
}
// out.flush();
} catch (IOException e) {
throw e;
} finally {
out.close();
in.close();
}
}
}
}

/**
/**
* 解压zip格式压缩包 对应的是ant.jar
*/
private static void unzip(String sourceZip, String destDir)
throws Exception {
try {
Project p = new Project();
Expand e = new Expand();
e.setProject(p);
e.setSrc(new File(sourceZip));
e.setOverwrite(false);
e.setDest(new File(destDir));
/*
* ant下的zip工具默认压缩编码为UTF-8编码， 而winRAR软件压缩是用的windows默认的GBK或者GB2312编码
* 所以解压缩时要制定编码格式
*/
e.setEncoding("gbk");
e.execute();
} catch (Exception e) {
throw e;
}
}

/**
* 解压rar格式压缩包。
* 对应的是java-unrar-0.3.jar，但是java-unrar-0.3.jar又会用到commons-logging-1.1.1.jar
*/
private static void unrar(String sourceRar, String destDir)
throws Exception {
Archive a = null;
FileOutputStream fos = null;
try {
a = new Archive(new File(sourceRar));
FileHeader fh = a.nextFileHeader();
while (fh != null) {
if (!fh.isDirectory()) {
// 1 根据不同的操作系统拿到相应的 destDirName 和 destFileName
String compressFileName = fh.getFileNameString().trim();
String destFileName = "";
String destDirName = "";
// 非windows系统
if (File.separator.equals("/")) {
destFileName = destDir
+ compressFileName.replaceAll("\\\\", "/");
destDirName = destFileName.substring(0,
destFileName.lastIndexOf("/"));
// windows系统
} else {
destFileName = destDir
+ compressFileName.replaceAll("/", "\\\\");
destDirName = destFileName.substring(0,
destFileName.lastIndexOf("\\"));
}
// 2创建文件夹
File dir = new File(destDirName);
if (!dir.exists() || !dir.isDirectory()) {
dir.mkdirs();
}
// 3解压缩文件
fos = new FileOutputStream(new File(destFileName));
a.extractFile(fh, fos);
fos.close();
fos = null;
}
fh = a.nextFileHeader();
}
a.close();
a = null;
} catch (Exception e) {
throw e;
} finally {
if (fos != null) {
try {
fos.close();
fos = null;
} catch (Exception e) {
e.printStackTrace();
}
}
if (a != null) {
try {
a.close();
a = null;
} catch (Exception e) {
e.printStackTrace();
}
}
}
}

/**
* 解压缩
*/
public static void deCompress(String sourceFile, String destDir)
throws Exception {
// 保证文件夹路径最后是"/"或者"\"
char lastChar = destDir.charAt(destDir.length() - 1);
if (lastChar != '/' && lastChar != '\\') {
destDir += File.separator;
}
// 根据类型，进行相应的解压缩
String type = sourceFile.substring(sourceFile.lastIndexOf(".") + 1);
if (type.equals("zip")) {
ZipUtils.unzip(sourceFile, destDir);
} else if (type.equals("rar")) {
ZipUtils.unrar(sourceFile, destDir);
} else {
throw new Exception("只支持zip和rar格式的压缩包！");
}
}

}