日记

今天做了顿饭
有西红柿炒鸡蛋
青椒炒鸡胸肉
油焖茄子（切太大了没熟。）
青菜炒火腿肠
感觉这个阶段的同学们都很多态
不过大体上都是在学习
有的四个小时
有的八个小时
有的十二个小时
太离谱了

在游览器中打印信息

package com.example.Servlet.controller;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;
import java.io.PrintWriter;

public class ThreeServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String result = "java<br>mysql<br>html";
        String result2 = "<br>红烧排骨<br>糖醋里脊";
        //设置打印信息的格式
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        out.println(result);
        out.println(result2);
    }

}

url uri Method

关键语句：

        String url = request.getRequestURL().toString();
        String uri = request.getRequestURI();
        String Method = request.getMethod();
        System.out.println(url);
        System.out.println(uri);
        System.out.println(Method);

package com.example.Servlet.controller;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;
import java.io.PrintWriter;

public class ThreeServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String url = request.getRequestURL().toString();
        String uri = request.getRequestURI();
        String Method = request.getMethod();
        System.out.println(url);
        System.out.println(uri);
        System.out.println(Method);
                        
    }

}

重定向

关键语句：

String result3 = "http://www.baidu.com";
	response.sendRedirect(result3);

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;
import java.io.PrintWriter;

public class ThreeServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String result3 = "http://www.baidu.com";
        response.sendRedirect(result3);
}

获取请求对象的名称和内容

首先创建页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
  <a href="/MyWeb/four?userName=user&Password=123">four</a>
</body>
</html>

在页面中将请求名称和内容写进url中

然后创建servlet接收请求
使用request.getparameterNames()方法来获取枚举对象
用循环遍历出name
使用request.getparameter(name)方法来获取请求参数

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

public class fourServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //通过请求对象获取【请求头】中【所有请求参数名】
        Enumeration enumeration = request.getParameterNames();//将所有请求参数名称保存到一个枚举对象进行返回
        while(enumeration.hasMoreElements()){
            String name = (String) enumeration.nextElement();
            //通过请求参数名称获取请求参数内容
            String body = request.getParameter(name);
            System.out.println("请求参数名称 " +name+ " 请求参数内容 " +body);
        }
    }
}