搭建spring mvc 实现select类似操作以及出现的404错误解决办法

2023-12-24 17:21:28

新建maven工程

选择下一步

修改名称

完成即可

在java路径下新建包并且添加mycontroller类

java类中输入

package com.lll.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.ServletException;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

/**
* 控制类
*/
@Controller
class Mycontroller {
@RequestMapping("demo")
@ResponseBody
public String demo(HttpServletRequest request) throws ServletException, IOException {

String name=request.getParameter("name");
String password=request.getParameter("password");

Map map=new HashMap();
map.put("name",name);
map.put("password",password);

request.setAttribute("map",map);
System.out.println(map);
return null;
}
@RequestMapping("demo2")
@ResponseBody
public String demo2() {
System.out.println("我是单元方法demo2");
return "demo2";
}
@RequestMapping("demo3")
@ResponseBody
public String demo3(String name){
return "demo3_name="+name;
}

private class HttpServletRequest {
public String getParameter(String name) {
return name;
}

public void setAttribute(String map, Map map1) {
}
}
}

在main文件下的resources中创建jsp，xml，xml文件

配置web.xml文件

<!-- springmvc的前端控制器 -->
<servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

在springmvc.xml创建代码

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-3.0.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <!--自动扫描目录下所有的类文件 -->
    <context:component-scan base-package="com.lll.controller" />
    <!--默认注解映射的支持 -->
    <mvc:annotation-driven />

</beans>

在jsp中显示输出

<%--
  Created by IntelliJ IDEA.
  User: lenovo
  Date: 2021/9/19
  Time: 16:42
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<table >
    <form method="post" action="demo">
        <tr>
            <td>姓名：</td>
            <td><input type="text" name="name"/></td>
        </tr>
        <tr>
            <td>密码：</td>
            <td><input type="text" name="password"/></td>
        </tr>
        <tr>
            <td colspan="2"><input type="submit" value="提交"/></td>
        </tr>
    </form>
</table>
</body>
</html>