org.apache.tools.zip.*和org.apache.commons.httpclient.*实现远程文件打包下载，支持中文文件名

package com.kedacom.kdkk.controller.querymanager;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
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.net.URLEncoder;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.UUID;
import java.util.regex.Pattern;
import java.util.zip.CRC32;
import java.util.zip.CheckedOutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.GetMethod;

import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;

public class BatchDownload extends HttpServlet {
	
private static List list = new ArrayList();
Date date = null;
private static int BUF_SIZE = 40480;  
private static String ZIP_ENCODEING = "GBK";  


 public BatchDownload() {
  super();
 }

 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
	//设置编码
	request.setCharacterEncoding("utf-8");
	date =  new Date();
	//设置下载头信息
	response.setContentType("application/octet-stream");
	response.setHeader("Content-Disposition", "attachment; filename=\""+date.getTime()+".zip\"");
	//要打包下载的图片json参数
  	String cbxStr = request.getParameter("cbxStr");
  	if(cbxStr.length() > 0){
  		cbxStr = cbxStr.substring(0, cbxStr.length()-1);
  		String [] cbxs = cbxStr.split(";");
  	     HttpClient client = new HttpClient();
  	     GetMethod get = null;
		 //创建本地存储文件路径
  	     new File("d:/vehicleImgs/"+date.getTime()+"/").mkdir();
  	     for(int i = 0; i < cbxs.length; i ++){
  	    	 try {   
				 //构建远程服务的图片下载路径
  	    		 String cbxs2 [] = cbxs[i].split("z");
  	    		 String vid = cbxs2[0];
  	    		 String timestamp = cbxs2[1];
  	    		 String imgtype = cbxs2[2].split(",")[0];
  	    		 String imgName = cbxs2[3];
  	    		 imgName = imgName.replace(" ", "_").replace(":", "_");
  	    		 DateFormat format1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
  	    		 Long timeStamp = format1.parse(timestamp).getTime();
  	    		 String imgUrl = getServletContext().getInitParameter("opticmServer");                 
				 //此方法的参数可自行传入，参数值为远程服务的servlet(xxx.do),返回的值为文件流对象
  			     get = new GetMethod(imgUrl+"&contentId="+vid+"&imgType="+imgtype+"&imgOrder=0&timeStamp="+timeStamp);    
  			     int j = client.executeMethod(get);                               
  			     if (200 == j)//是否正确返回                                                    
  			      {                                                               
  			          File storeFile = new File("d:/vehicleImgs/"+date.getTime()+"/"+imgName+".jpg");
  			          FileOutputStream output = new FileOutputStream(storeFile);  
  			          // 得到网络资源的字节数组,并写入文件                        
  			          output.write(get.getResponseBody());                        
  			          output.close();      
  			      }else{                                                               
  			          System.out.println("no pic");                               
  			      }                                                           
  			  } catch ( Exception e ){                                                                   
  			      System.out.println("Exception no pic");                                   
  			  } finally{
  				  get.releaseConnection(); 
  			  }
  	     }
  	   try {
		   //开始压缩下载下来的本机图片
  		  zip("d:\\vehicleImgs\\"+date.getTime()+".zip", new File("d:\\vehicleImgs\\"+date.getTime()+"\\"));
		  //下载zip打包后的文件
  		  FileInputStream fis = new FileInputStream("d:\\vehicleImgs\\"+date.getTime()+".zip"); 
		  	 byte[] bytes=new byte[BUF_SIZE];
		  	 int r = 0;   
		  	 response.flushBuffer();
			 while((r=fis.read(bytes))>0) {
				response.getOutputStream().write(bytes,0,r);
			 }
			 fis.close(); 
			 response.getOutputStream().close();
	} catch (Exception e) {
		e.printStackTrace();
	}  
  	}
 }

 /** 
      * 压缩文件或文件夹 
      *  
      * @param zipFileName 
     * @param inputFile 
     * @throws Exception 
     */  
    public void zip(String zipFileName, File inputFile) throws Exception {  
        // 未指定压缩文件名，默认为"ZipFile"   
        if (zipFileName == null || zipFileName.equals(""))  
            zipFileName = "ZipFile";  
 
        // 添加".zip"后缀   
        if (!zipFileName.endsWith(".zip"))  
        	zipFileName += ".zip";  
  
        // 创建文件夹   
        File f = null;
	    String path = Pattern.compile("[\\/]").matcher(zipFileName).replaceAll(File.separator);  
	    int endIndex = path.lastIndexOf(File.separator);  
	    path = path.substring(0, endIndex);  
	    f = new File(path);
        f.mkdirs();  
        // 开始压缩   
       {  
             ZipOutputStream zos = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFileName)));  
             zos.setEncoding(ZIP_ENCODEING);  
             compress(zos, inputFile, "");
             zos.close();  
         }  
    }  
    /** 
         * 压缩一个文件夹或文件对象到已经打开的zip输出流 <b>不建议直接调用该方法</b> 
         *  
         * @param zos 
         * @param f 
         * @param fileName 
         * @throws Exception 
         */  
        public void compress(ZipOutputStream zos, File f, String fileName) throws Exception {  
            if (f.isDirectory()) {  
                // 压缩文件夹   
               File[] fl = f.listFiles();  
                zos.putNextEntry(new ZipEntry(fileName + "/"));  
                fileName = fileName.length() == 0 ? "" : fileName + "/";  
                for (int i = 0; i < fl.length; i++) {  
                    compress(zos, fl[i], fileName + fl[i].getName());  
                }  
            } else {  
                // 压缩文件   
                zos.putNextEntry(new ZipEntry(fileName));  
                FileInputStream fis = new FileInputStream(f);  
                this.inStream2outStream(fis, zos);  
                zos.flush();
                fis.close();  
                zos.closeEntry();  
            }  
        }  
      
        public void inStream2outStream(InputStream is, OutputStream os) throws IOException {  
            BufferedInputStream bis = new BufferedInputStream(is);  
            BufferedOutputStream bos = new BufferedOutputStream(os);  
            int bytesRead = 0;  
            for (byte[] buffer = new byte[BUF_SIZE]; ((bytesRead = bis.read(buffer, 0, BUF_SIZE)) != -1);) {  
                bos.write(buffer, 0, bytesRead); // 将流写入   
            }  
        }  

 
 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  this.doGet(request, response);
 }
} 

评论

1 楼 sunjunliangsunjun 2012-06-18