#文件下载#

download.java

//注意要点
//1.文件格式的设置
//2.文件名中中文的设置
//3.文件大小的设置
//4.设置一个相应的头 Servlet download file:搜  键：文件的描述   值：对应的文件
      response.setContentType("application/pdf");//设置文件格式
    
  	String fileName = "第一章.pdf";
  	File file = new File("I:/test/upload","第一章.pdf");//下载文件的路径及名称
  	response.setContentLength(new Long(file.length()).intValue());//进度条的操作，提示完成进度
  	
  	response.setHeader("Content-Disposition",
            "attachment;filename="+new String(fileName.getBytes("UTF-8"),"ISO8859-1"));//中英文的切换
  	InputStream inputStream = new FileInputStream(file);//输入到客户
  	
  	OutputStream oStream = response.getOutputStream();//从内存输出
  	
  	BufferedInputStream bis = new BufferedInputStream(inputStream);
  	BufferedOutputStream bos =new BufferedOutputStream(oStream);
  	
  	int len = -1;
  	byte[] buffer = new byte[1024];
  	
  	while((len=bis.read(buffer))!=-1){
  		bos.write(buffer, 0, len);
  	}
  	
  	bos.flush();
  	bis.close();
  	bos.close();