java 用 io 输出流 进行文件下载！

使用io输出流下载：直接上java 代码，

html 界面只需要一个<a href="xxxxx/xxx/xx">下载</a> 地址直接写对应的java 地址就好。

方法一：

	@RequestMapping("domload.it")
	public void domload(HttpServletResponse response, HttpServletRequest request) throws IOException  {
		 //获得请求文件名 
		String path = request.getServletContext().getRealPath("/resource/pdf/enquiry.pdf");
		System.out.println(path);
		//以下载方式打开
		response.setHeader("Content-Disposition", "attachment;filename=java.pdf");
		File file = new File(path);
		FileInputStream fis =  new FileInputStream(file);
		//写出
		 ServletOutputStream out = response.getOutputStream();
		//定义读取缓冲区
		byte buffer[] = new byte[1024];
		//定义读取长度
		int len = 1024;
		//循环读取
		while((len = fis.read(buffer))!=-1){
			out.write(buffer,0,len);
		}
		
		//释放资源
		fis.close();
		out.flush();
		out.close();
	}	
	

方法2：
	
	@RequestMapping("domload1.it")
	public void domload1(HttpServletResponse response, HttpServletRequest request) throws IOException  {
		 //获得请求文件名 
		String path = request.getServletContext().getRealPath("/resource/pdf/enquiry.pdf");
		System.out.println(path);
		File file = new File(path);
		//以下载方式打开
		response.setHeader("Content-Disposition", "attachment;filename="+URLEncoder.encode(file.getName(),"UTF-8"));
		
		//创建刘对象
		FileReader reader = new FileReader(file);
		//写出
		PrintWriter out = response.getWriter();
		//定义读取缓冲区
		char buffer[] = new char[1024];
		//定义读取长度
		int len = 1024;
		//循环读取
		while((len = reader.read(buffer))!=-1){
			out.write(buffer,0,len);
		}
		
		//释放资源
		reader.close();
		out.flush();
		out.close();
		
	}