Jsp页面实现文件上传下载

     * @param fileName
     */
    public void setDisFileName(String fileName){
        this.disFileName = fileName;
    }
   
    /**
     * set zip file path
     * @param fileNames
     */
    public void setZipFilePath( String path ){
        this.zipFilePath = path;
    }
   
    public void setZipDelFlag(boolean b){
        this.zipDelFlag = b;
    }
   
    /**
     * set zip file names
     * @param fileNames
     */
    public void setZipFileNames(String[] fileNames){
        this.zipFileNames = fileNames;
    }
   
    /**
     * set download file name
     * @param fileName
     */
    public void setDownFileName(String fileName){
        this.downFileName = fileName;
    }
   
    /**
     * set file content
     * @param fileContent
     */
    public int setFileContent(String fileContent){   
        try{   
            byte[] buffs = fileContent.getBytes("UTF-8");
            response.getOutputStream().write(buffs);
        }catch(IOException e){
            return IO_EXCEPTION;
        }
        return PROCESS_OK;
    }
   
    /**
     * set file content
     * @param fileContent
     */
    public int setFileContent(byte[] fileContent){
        try{
            response.getOutputStream().write(fileContent);
        }catch(IOException e){
            return IO_EXCEPTION;
        }
        return PROCESS_OK;
    }
   
    /**
     * set file content end
     *
     */
    public int setFileContentEnd(){
        try{
            response.getOutputStream().close();
        }catch(IOException e){
            return IO_EXCEPTION;
        }
        return PROCESS_OK;
    }
   
    /**
     * main process
     * @return
     */
    public int process(){
        int status = PROCESS_OK;
       
        status = preCheck();
        if ( status != PROCESS_OK )
            return status;
           
        String fileName = disFileName;
       
        response.setContentType("APPLICATION/OCTET-STREAM");  
        response.setHeader("Content-Disposition","attachment;filename=\"" + fileName + "\"");
        int BUFSIZE = 1024 * 8;       
        int rtnPos = 0;
        byte[] buffs = new byte[ BUFSIZE ];

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