将文件夹中的文件压缩到zip

import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
//dir2zip:文件夹路径，zipName:zip文件名
public void zipDir(String dir2zip, String zipName) throws Exception
        {
	        try 
	        { 
	            //create a ZipOutputStream to zip the data to 
	            ZipOutputStream zos = new 
	                   ZipOutputStream(new FileOutputStream(zipName)); 
	            //assuming that there is a directory named inFolder (If there 
	            //isn't create one) in the same directory as the one the code 
	            //runs from, 
	            //call the zipDir method 
	            String rootPath = dir2zip;
	            zipDir(dir2zip, zos, rootPath); 
	            //close the stream 
	            zos.close(); 
	        } 
	        catch(Exception e) 
	        { 
	        	logger.info("SM315-Exception in FileBean.zipDir() 115 "+e);
	            throw e;
	        }
        }
        public void zipDir(String dir2zip, ZipOutputStream zos, String rootPath) throws Exception 
        { 
            try 
           { 
                //create a new File object based on the directory we 
               // have to zip File    
                 File zipDir = new File(dir2zip);
                 
                //get a listing of the directory content 
                String[] dirList = zipDir.list(); 
                byte[] readBuffer = new byte[2156]; 
                int bytesIn = 0; 
                //loop through dirList, and zip the files 
                for(int i=0; i<dirList.length; i++) 
                { 
                    File f = new File(zipDir, dirList[i]); 
                if(f.isDirectory()) 
                { 
                        //if the File object is a directory, call this 
                        //function again to add its content recursively 
                    String filePath = f.getPath(); 
                    zipDir(filePath, zos, rootPath); 
                        //loop again 
                    continue; 
                } 
                    //if we reached here, the File object f was not 
                   	// a directory 
                    //create a FileInputStream on top of f 
                    FileInputStream fis = new FileInputStream(f); 
                    //create a new zip entry 
                ZipEntry anEntry = new ZipEntry(f.getPath().substring(rootPath.length()+1)); 
                    //place the zip entry in the ZipOutputStream object 
                zos.putNextEntry(anEntry); 
                    //now write the content of the file to the ZipOutputStream 
                    while((bytesIn = fis.read(readBuffer)) != -1) 
                    { 
                        zos.write(readBuffer, 0, bytesIn); 
                    } 
                   //close the Stream 
                   fis.close(); 
                } 
           } 
     	  catch(Exception e) 
     	  { 
	        	logger.info("SM315-Exception in FileBean.zipDir() 116 "+e);
	            throw e;
     	  } 
        }