编程操作Jar文件
支持把单个文件或者文件夹压缩成JAR文件， 支持把单个文件添加到已存在的JAR文件中， 支持读取JAR文件中的任何一个entry.
1. 环境
jdk1.6
2. 代码
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
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.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarOutputStream;
import java.util.zip.Deflater;
import java.util.zip.ZipEntry;
import org.apache.log4j.Logger;
public class JarTool {
private static final Integer BUFFER_SIZE = 512;
/**
* Logger for this class
*/
private static final Logger logger = Logger.getLogger(JarTool.class);
/**
* 压缩文件夹及其子文件夹
* @param source String 源文件夹,如: d:/tmp
* @param dest String 目标文件,如: e:/tmp.jar
* @throws IOException
*/
public static void compressFolder(String source, String dest)throws IOException{
JarOutputStream jos = new JarOutputStream(new FileOutputStream(dest));
jos.setLevel(Deflater.BEST_COMPRESSION);
compressJarFolder(jos, new File(source),"");
jos.close();
}
private static void compressJarFolder(JarOutputStream jos, File f, String base)throws IOException{
if(f.isFile()){
compressJarFile(jos, f, base);
}else if(f.isDirectory()){
compressDirEntry(jos, f, base);
String[] fileList = f.list();
for(String file:fileList){
String newSource = f.getAbsolutePath() + File.separator + file;
File newFile = new File(newSource);
String newBase = base + "/" + f.getName()+"/"+newFile.getName();
if(base.equals("")){
newBase = newFile.getName();//f.getName()+"/"+newFile.getName();
}else{
newBase = base + "/" + newFile.getName();
}
logger.info("正在压缩文件从 "+newSource+" 到 "+newBase);
compressJarFolder(jos, newFile, newBase);
}//for
}//if
}
//压缩单个文件
private static void compressJarFile(JarOutputStream jos, File f, String base)throws IOException{
jos.putNextEntry(new ZipEntry(base));
BufferedInputStream bin = new BufferedInputStream(new FileInputStream(f));
byte[] data = new byte[JarTool.BUFFER_SIZE];
while ((bin.read(data)) != -1) {
jos.write(data);
}
bin.close();
jos.closeEntry();
}
public static void compressFile(String sourceFile)throws IOException{
String jarFile = sourceFile.substring(0, sourceFile.lastIndexOf('.')) + ".jar";
compressFile(sourceFile, jarFile);
}
//压缩单个文件到JAR文件中
public static void compressFile(String sourceFile, String jarFile)throws IOException{
File f = new File(sourceFile);
String base = f.getName();
JarOutputStream jos = new JarOutputStream(new FileOutputStream(jarFile));
jos.putNextEntry(new ZipEntry(base));
BufferedInputStream bin = new BufferedInputStream(new FileInputStream(f));
byte[] data = new byte[JarTool.BUFFER_SIZE];
while ((bin.read(data)) != -1) {
jos.write(data);
}
bin.close();
jos.closeEntry();
jos.close();
}
//压缩空文件夹
private static void compressDirEntry(JarOutputStream jos, File f, String base)throws IOException{
jos.putNextEntry(new ZipEntry(base + "/"));
jos.closeEntry();
}
public static byte[] readEntry(String jarFile, String entryName)throws IOException{
ByteArrayOutputStream baos = new ByteArrayOutputStream();
boolean existEntry = readEntry(jarFile, entryName, baos);
if(!existEntry){
return null;
}
return baos.toByteArray();
}
public static boolean readEntry(String jarFile, String entryName, OutputStream os)throws IOException{
JarFile jar = new JarFile(new File(jarFile));
JarEntry entry = jar.getJarEntry(entryName);
if(entry == null){
return false;
}
InputStream is = new BufferedInputStream(jar.getInputStream(entry));
int len = 0;
byte[] b = new byte[1024];
while ((len = is.read(b, 0, b.length)) != -1) {
os.write(b, 0, len);
}
is.close();
return true;
}
public static boolean existsEntry(String jarFile, String entryName)throws IOException{
JarFile jar = new JarFile(new File(jarFile));
JarEntry entry = jar.getJarEntry(entryName);
if(entry == null){
return false;
}
return true;
}
public static String readTextEntry(String jarFile, String entryName, String encoding)throws IOException{
String entryContent = "";
ByteArrayOutputStream baos = new ByteArrayOutputStream();
boolean existEntry = readEntry(jarFile, entryName, baos);
if(!existEntry){
return null;
}
byte[] content = baos.toByteArray();
baos.close();
if(encoding == null){//按平台默认编码
entryContent = new String(content);
}else{
entryContent = new String(content, encoding);
}
return entryContent;
}
public static String readTextEntry(String jarFile, String entryName)throws IOException{
return readTextEntry(jarFile, entryName, null);
}
public static void uncompress(String jarFile)throws IOException{
File f = new File(jarFile);
String path = f.getAbsolutePath();
int index = path.lastIndexOf(".");
if(index > 0){
path = path.substring(0, index);
}
uncompress(jarFile, path);
}
public static void uncompress(String jarFile, String outputDir)throws IOException{
if(!new File(outputDir).exists()){
new File(outputDir).mkdirs();
}
JarFile jar = new JarFile(new File(jarFile));
Enumeration
while(e.hasMoreElements()){
JarEntry entry = e.nextElement();
saveEntry(jar, entry, outputDir);
}
}
private static void saveEntry(JarFile jar, JarEntry entry, String outputDir)throws IOException{
logger.info("解压缩" + entry.getName() + " ... ... ");
File f = new File(new File(outputDir), entry.getName());
if(entry.isDirectory()){
f.mkdirs();
return ;
}else{
f.createNewFile();
}
FileOutputStream fos = new FileOutputStream(f);
InputStream is = new BufferedInputStream(jar.getInputStream(entry));
int len = 0;
byte[] b = new byte[1024];
while ((len = is.read(b, 0, b.length)) != -1) {
fos.write(b, 0, len);
}
is.close();
fos.close();
}
}
3. 测试代码
JarTool.compressFolder("d:\\test", "d:\\test.jar");
JarUtil.jarFile("d:/key.txt");
String text = readTextEntry("d:\\test.jar", "key.txt");
System.out.println(text);
JarTool.uncompress("d:\\test\\test-0.1.0.jar");