JAR解壓縮方法

JAR解壓縮方法
作者：hunhun1981
出自：http://blog.csdn.net/hunhun1981/

        下面這些代碼，是用來解壓jar檔案的（我自己寫了一個打包工具，專門用於修改設定檔並對原始JAR進行二次發布）。

第一種是使用JarFile類來完成功能，大家可以稍加修改，整合ClassLoader既可以實現一個自解壓的JAR包。

package otheri;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.Enumeration;import java.util.jar.JarEntry;import java.util.jar.JarFile;/** * * @author hunhun1981 <hunhun1981@hotmail.com> */public class JARDecompressionTool {    public static synchronized void decompress(String fileName, String outputPath) throws IOException {        if (!outputPath.endsWith(File.separator)) {            outputPath += File.separator;        }        File dir = new File(outputPath);        if (!dir.exists()) {            dir.mkdir();        }        JarFile jf = new JarFile(fileName);        for (Enumeration e = jf.entries(); e.hasMoreElements();) {            JarEntry je = (JarEntry) e.nextElement();            String outFileName = outputPath + je.getName();            File f = new File(outFileName);            if (outFileName.endsWith("/") || outFileName.endsWith("//") || outFileName.endsWith(File.separator)) {                f.mkdir();            } else {                InputStream in = jf.getInputStream(je);                OutputStream out = new BufferedOutputStream(new FileOutputStream(f));                byte[] buffer = new byte[2048];                int nBytes = 0;                while ((nBytes = in.read(buffer)) > 0) {                    out.write(buffer, 0, nBytes);                }                out.flush();                out.close();                in.close();            }        }    }}

 

第二種是使用ant，代碼中還附帶了jar的打包和wtk簽名的方法。使用前請先整合ant和antenna。

package otheri.j2mePackageTools;import de.pleumann.antenna.WtkSign;import java.io.File;import org.apache.tools.ant.Project;import org.apache.tools.ant.taskdefs.Expand;import org.apache.tools.ant.taskdefs.Jar;import org.apache.tools.ant.types.FileSet;/** * * @author hunhun1981 <hunhun1981@hotmail.com> */public class JARUtils {    public static void jarPackage(File srcPath, File manifest, String manifestEncoding, File output) {        Project prj = new Project();        Jar jar = new Jar();        jar.setProject(prj);        jar.setDestFile(output);        FileSet fileSet = new FileSet();        fileSet.setProject(prj);        fileSet.setDir(srcPath);        fileSet.setIncludes("**/*.*");        jar.addFileset(fileSet);        jar.setManifest(manifest);        jar.setManifestEncoding(manifestEncoding);        jar.execute();    }    public static void jarExpand(File jarFile, File outputPath) {        Project prj = new Project();        Expand expand = new Expand();        expand.setProject(prj);        expand.setSrc(jarFile);        expand.setOverwrite(true);        expand.setDest(outputPath);        expand.execute();    }    public static void wtkSign(File jadFile, File jarFile, File keyStoreFile, String storePass, String cerAlias, String cerPass) {        Project prj = new Project();        WtkSign wtk = new WtkSign();        wtk.setProject(prj);        wtk.setJadFile(jadFile);        wtk.setJarFile(jarFile);        wtk.setKeyStore(keyStoreFile);        wtk.setStorePass(storePass);        wtk.setCertAlias(cerAlias);        wtk.setCertPass(cerPass);        wtk.execute();    }}

 

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