android平台上的文件下载,文件和文件的操作(4)

                    reader.close(); 
                if(in!=null) 
                    in.close(); 
                 
            } catch (IOException e) { 
                // TODO Auto-generated catch block 
                e.printStackTrace(); 
            } 
             
        } 
        return result.toString(); 
    } 
    /*将文件写入SD卡
     * @return -1 写入失败 0存在 1写入成功
     * @param urlStr 本机测试是不是ip不是localhost和127.0.0.1,这是指android的IP,电脑是10.0.2.2
     * */ 
     
     
    public int downloadFile(String urlStr,String toPath,String fileName){ 
        try { 
            URL url=new URL(urlStr); 
        URLConnection con=url.openConnection(); 
        InputStream in=con.getInputStream(); 
        FileUtil fileUtil=new FileUtil(); 
        if(fileUtil.isFileExist(toPath+fileName)){ 
             
            return 0; 
        } 
         
        File file=fileUtil.writeToSDFromInputStream(toPath, fileName, in); 
             
        if(file==null){ 
            return -1; 
        } 
         
        } catch (MalformedURLException e) {