修改Jar自述文件

public class ModifyManifest extends AbstractCmdTest{// private String jarPath="E:\\xxx\\junit-4.8.1.jar"; //要修改自述文件的Jar包路径// private String jarPath2="E:\\xxx\\junit.jar"; //jar包零时存放路径@Overridepublic boolean execute() {String jarPath=this.getInputInfo("jarPath").toString(); //获取需要修改自述文件的Jar包路径String jarPath2=this.getInputInfo("jarPath2").toString();//获取Jar零时存放路径Map manifestMap=(Map) this.getInputInfo("manifest"); //获取带有描述信息的Maptry {JarFile jarFile = new JarFile(jarPath); //得到要修改的Jar包Manifest mf=jarFile.getManifest(); //得到其自述文件StringBuffer attributes=new StringBuffer(); //存放描述信息的StringBufferSet maniSet=manifestMap.keySet();for(Object obj:maniSet){ //向StringBuffer中添加Map中的信息String key=obj.toString();String value=(String)manifestMap.get(obj);attributes.append(key+value+"\n");}//把Map中的信息以UTF-8的形式放到流InputStream mfStream = new ByteArrayInputStream(attributes.toString().getBytes("UTF-8"));Manifest newmf=new Manifest(mfStream); //用包含Map信息的流生成ManifestSoftReference<Manifest> manifest=new SoftReference(newmf); //得到Manifest 软引用 Field filed=JarFile.class.getDeclaredField("manRef"); //得到SoftReference<Manifest>反射filed.setAccessible(true);filed.set(jarFile, manifest);//*************输出信息确认修改正确*********Attributes a=jarFile.getManifest().getMainAttributes();Set i=a.keySet();for(Object o:i){System.out.println(o.toString()+a.getValue(o.toString()));}//生成修改后的文件JarOutputStream jarOutput=new JarOutputStream(new FileOutputStream(jarPath2),newmf);//用新的Manifest文件生成Jar输出流JarInputStream jarInput = new JarInputStream(new FileInputStream(jarPath)); //jar文件输入流 JarEntry jarEntry=null;byte[] jarByte=new byte[4096];while((jarEntry=jarInput.getNextJarEntry())!=null){jarOutput.putNextEntry(jarEntry);int length;while((length=jarInput.read(jarByte))!=-1){jarOutput.write(jarByte, 0, length);}jarOutput.closeEntry();}jarOutput.flush();jarOutput.close();jarInput.close();//用新生成的jar包覆盖原来的jar包FileInputStream fileInput=new FileInputStream(jarPath2); FileOutputStream fileOutput=new FileOutputStream(jarPath);byte[] fileByte=new byte[4096];int fileLength;while((fileLength=fileInput.read(fileByte))>0){fileOutput.write(fileByte, 0,fileLength);}fileOutput.flush();fileOutput.close();fileInput.close();File f=new File(jarPath2);f.delete();return true; //返回true} catch (IOException e) {e.printStackTrace();} catch (SecurityException e) {e.printStackTrace();} catch (NoSuchFieldException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} return false;}public static void main(String[] args){//输入参数Map manifest=new HashMap();manifest.put("Manifest-Version:", " 123456789.0");manifest.put("Ant-Version:", " Apache Ant 1.789.1");manifest.put("Created-By:", " 1.5.0_20-141 (Apple Inc.)");manifest.put("guga:", " gaaaaa");M