java解压缩文件

package com.kingschan.util.zip;   
  
import java.io.File;   
import java.io.FileOutputStream;   
import org.apache.tools.ant.Project;   
import org.apache.tools.ant.taskdefs.Expand;   
import de.innosystec.unrar.Archive;   
import de.innosystec.unrar.rarfile.FileHeader;   
  /**
   * DeCompress Util class
   * @author kingschan
   *date:2013-6-9
   */
public class DeCompressUtil {   
	 /**  
	    * 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")||type.equals("jar")){   
	           DeCompressUtil.unzip(sourceFile, destDir);   
	        }else if(type.equals("rar")){   
	            DeCompressUtil.unrar(sourceFile, destDir);   
	        }else{   
	            throw new Exception("only support jar zip or rar file ...");   
	        }   
	    }   
	   
	  
}