jar文件的复制和解压(JarInputStream,JarOutputStream和JarFile)

package test;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarInputStream;
import java.util.jar.JarOutputStream;
import java.util.jar.Manifest;
import java.util.zip.ZipEntry;

import org.apache.log4j.Logger;
import org.junit.Test;

public class Util_Jar_Test {

Logger log = Logger.getLogger(this.getClass());

//复制jar
public static void copyJar(File src , File des) throws FileNotFoundException, IOException{
JarInputStream jarIn = new JarInputStream(new BufferedInputStream(new FileInputStream(src)));
Manifest manifest = jarIn.getManifest();
JarOutputStream jarOut = null;
if(manifest == null){
jarOut = new JarOutputStream(new BufferedOutputStream(new FileOutputStream(des)));
}else{
jarOut = new JarOutputStream(new BufferedOutputStream(new FileOutputStream(des)),manifest);
}

byte[] bytes = new byte[1024];
while(true){
//重点
ZipEntry entry = jarIn.getNextJarEntry();
if(entry == null)break;
jarOut.putNextEntry(entry);

int len = jarIn.read(bytes, 0, bytes.length);
while(len != -1){
jarOut.write(bytes, 0, len);
len = jarIn.read(bytes, 0, bytes.length);
}
//            log.info("Copyed: " + entry.getName());
//            jarIn.closeEntry();
//            jarOut.closeEntry();
String a = new String();
a.length();
}
jarIn.close();
jarOut.finish();
jarOut.close();
}

//解压jar
public void unJar(File src , File desDir) throws FileNotFoundException, IOException{
JarInputStream jarIn = new JarInputStream(new BufferedInputStream(new FileInputStream(src)));
if(!desDir.exists())desDir.mkdirs();
byte[] bytes = new byte[1024];

while(true){
ZipEntry entry = jarIn.getNextJarEntry();
if(entry == null)break;

File desTemp = new File(desDir.getAbsoluteFile() + File.separator + entry.getName());

if(entry.isDirectory()){    //jar条目是空目录
if(!desTemp.exists())desTemp.mkdirs();
log.info("MakeDir: " + entry.getName());
}else{    //jar条目是文件
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(desTemp));
int len = jarIn.read(bytes, 0, bytes.length);
while(len != -1){
out.write(bytes, 0, len);
len = jarIn.read(bytes, 0, bytes.length);
}

out.flush();
out.close();

log.info("Copyed: " + entry.getName());
}
jarIn.closeEntry();
}

//解压Manifest文件
Manifest manifest = jarIn.getManifest();
if(manifest != null){
File manifestFile = new File(desDir.getAbsoluteFile()+File.separator+JarFile.MANIFEST_NAME);
if(!manifestFile.getParentFile().exists())manifestFile.getParentFile().mkdirs();
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(manifestFile));
manifest.write(out);
out.close();
}

//关闭JarInputStream
jarIn.close();
}

//复制jar by JarFile
public void copyJarByJarFile(File src , File des) throws IOException{
//重点
JarFile jarFile = new JarFile(src);
Enumeration<JarEntry> jarEntrys = jarFile.entries();
JarOutputStream jarOut = new JarOutputStream(new BufferedOutputStream(new FileOutputStream(des)));
byte[] bytes = new byte[1024];

while(jarEntrys.hasMoreElements()){
JarEntry entryTemp = jarEntrys.nextElement();
jarOut.putNextEntry(entryTemp);
BufferedInputStream in = new BufferedInputStream(jarFile.getInputStream(entryTemp));
int len = in.read(bytes, 0, bytes.length);
while(len != -1){
jarOut.write(bytes, 0, len);
len = in.read(bytes, 0, bytes.length);
}
in.close();
jarOut.closeEntry();
log.info("Copyed: " + entryTemp.getName());
}

jarOut.finish();
jarOut.close();
jarFile.close();
}

//解压jar文件by JarFile
public void unJarByJarFile(File src , File desDir) throws FileNotFoundException, IOException{
JarFile jarFile = new JarFile(src);
Enumeration<JarEntry> jarEntrys = jarFile.entries();
if(!desDir.exists())desDir.mkdirs(); //建立用户指定存放的目录
byte[] bytes = new byte[1024];

while(jarEntrys.hasMoreElements()){
ZipEntry entryTemp = jarEntrys.nextElement();
File desTemp = new File(desDir.getAbsoluteFile() + File.separator + entryTemp.getName());

if(entryTemp.isDirectory()){    //jar条目是空目录
if(!desTemp.exists())desTemp.mkdirs();
log.info("makeDir" + entryTemp.getName());
}else{    //jar条目是文件
//因为manifest的Entry是"META-INF/MANIFEST.MF",写出会报"FileNotFoundException"
File desTempParent = desTemp.getParentFile();
if(!desTempParent.exists())desTempParent.mkdirs();

BufferedInputStream in = new BufferedInputStream(jarFile.getInputStream(entryTemp));
BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(desTemp));

int len = in.read(bytes, 0, bytes.length);
while(len != -1){
out.write(bytes, 0, len);
len = in.read(bytes, 0, bytes.length);
}

in.close();
out.flush();
out.close();

log.info("Copyed: " + entryTemp.getName());
}
}

jarFile.close();
}

/*实验结论:
* 1.JarInputStream的getNextJarEntry()和jarOutputStream的putNextJarEntry()中没有包括"META-INF/MANIFEST.MF"这一项,因此复制和解压都	要注意
* 2.JarFile的entries()方法包含了全部Entry,也包括"META-INF/MANIFEST.MF",没有"META-INF/"这一项,因此在解压的时候要先检测父文件存不存在
* 4.复制jar文件有3中方法, A是直接用BufferedInputStream和BufferedOutputStream复制,
*                      B是用JarInputStream的getNextJarEntry()和jarOutputStream的putNextJarEntry()
*                      C是用JarFile的entries()方法,遍寻JarEntry的InputStream,以此写出
* 5.解压jar的话推荐使用JarFile,当前实例方法只支持解压jar文件
* 6.在复制的时候,src文件只可以是jar文件,但des文件可以是带zip或rar后缀的文件
*/

public static void testCopyJar(){
File src = new File("C:\\Documents and Settings\\Administrator\\桌面\\ESB新版本\\新建文件夹\\win32.win32.x86\\eclipse\\plugins\\xmlEditor.jar");
File des = new File("C:\\Documents and Settings\\Administrator\\桌面\\ESB新版本\\新建文件夹\\win32.win32.x86\\eclipse\\workspace\\j\\lib/1.jar");
//实验表明只运行复制和解压jar文件
//        File src = new File("C:/rtf.zip");
//        File des = new File("C:/testCopy.zip");
try {
copyJar(src,des);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void main(String[] args) {
testCopyJar();
}

public void testUnJar(){
File src = new File("C:/a.jar");
//        File src = new File("C:/b.rar");    //不支持rar解压
String desFile = "aa";
File desDir = new File(src.getParent()+File.separator+desFile);
try {
unJar(src, desDir);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public void testCopyJarByJarFile(){
File src = new File("C:/a.jar");
File des = new File("C:/testCopy.zip");
try {
copyJarByJarFile(src,des);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public void testUnJarByJarFile(){
File src = new File("C:/a.jar");
//        File src = new File("C:/b.rar");    //不支持rar解压
String desFile = "aa";
File desDir = new File(src.getParent()+File.separator+desFile);
try {
unJarByJarFile(src, desDir);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}