Java HttpURLConnection 小demo

可以写java小程序来访问Servlet或者JSP
用到的核心类就是HttpURLConnection

Servlet 接受通过 HttpURLConnection 传递来的数据

public class HttpUrlConnectionServletr extends HttpServlet {
       
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         response.getWriter().write("abc");//接受过来的数据
         String name=request.getParameter("name");//根据参数得到数据
         String header=request.getHeader("a");
         System.out.println(name);
         System.out.println(header);
    }

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

Main方法中定义api

    /**
         * 读取服务器的数据
         * @throws MalformedURLException
         * @throws IOException
         */
        private static void Test1() throws MalformedURLException, IOException {
            URL url=new URL("http://localhost:8080/JspDemo/HttpUrlConnectionServletr");
             HttpURLConnection con=(HttpURLConnection) url.openConnection();
             InputStream inputStrea = con.getInputStream();//字节流
             InputStreamReader inputStreamReader = new InputStreamReader(inputStrea);//转为字符流
             //通过bufferReader 读取
             BufferedReader bufferedReader=new BufferedReader(inputStreamReader);
            String content = bufferedReader.readLine();
            
            int responseCode = con.getResponseCode();//获得状态码
            String headerField=con.getHeaderField("Server");//获取消息头 名字为 Server的头   
            
            
            System.out.println(content);
            System.out.println(responseCode);
            System.out.println(headerField);
        }
        /**
         * 给服务器传输数据
         * @throws MalformedURLException
         * @throws IOException
         */
        private static void Test2() throws MalformedURLException, IOException {
            URL url=new URL("http://localhost:8080/JspDemo/HttpUrlConnectionServletr");
             HttpURLConnection con=(HttpURLConnection) url.openConnection();
             con.setDoOutput(true);//cannot write to a URLConnection if doOutput=false - call setDoOutput(true)
             //给服务器发送请求头
                con.setRequestMethod("POST");
                con.setRequestProperty("a", "tou");
            OutputStream out = con.getOutputStream();
            out.write("name=jibenmima".getBytes());
            con.getResponseCode();//表示 请求完成  一个请求是有来回的
            
        }

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