springmvc后端接收前端数据的四种方式

前端登录页面代码 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <h1>登录页面</h1>
    <form action="login.do" method="post">
      username:<input type="text" name="username"></br>
      password:<input type="password" name="password"></br>
      <input type="submit">
    </form>
</body>
</html>

配置springmvc.xml 
<?xml version="1.0" encoding="UTF-8"?>

<beans
        xmlns="http://www.springframework.org/schema/beans"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:p="http://www.springframework.org/schema/p"
        xmlns:mvc="http://www.springframework.org/schema/mvc"
        xsi:schemaLocation="
		http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
		http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
		http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.3.xsd
		http://www.springframework.org/schema/aop
		http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
		">
<!--开启mvc-->
    <mvc:annotation-driven />
<!--开启注解依赖-->
    <context:annotation-config></context:annotation-config>
    <!--自动扫描包-->
    <context:component-scan base-package="com.bh"></context:component-scan>

</beans>
配置web.xml文件 
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <!--  配置编码 -->
    <filter>
        <filter-name>characterfilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterfilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!--springmvc的核心控制器-->
    <servlet>
        <servlet-name>disp</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--配置初始化参数-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>disp</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

</web-app>
controller类 
package com.bh.controller;

import com.bh.po.User;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@Controller
public class LoginController {

    /*
    * 方式一：原始方式
    * */
/*    @RequestMapping("/login")

    public String login1(HttpServletRequest request, HttpServletResponse response){
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        System.out.println(username);
        System.out.println(password);
        return "/result.html";


    }*/
    /*
    * 方式二：restful方式
    * */
    /*@RequestMapping("/login")
    public String login2(@RequestParam("username") String name,@RequestParam("password") String pwd){
        System.out.println(name);
        System.out.println(pwd);
        return "/result.html";
    }*/

    /*
    * 方式三：普通方式
    * */
/*    @RequestMapping("/login")
    public String login3(String username,String password){

        System.out.println(username);
        System.out.println(password);

        return "/result.html";
    }*/


    /*
    * 方式四：对象方式
    * */
    @RequestMapping("/login")
    public String login4(User user){
        String username = user.getUsername();
        String password = user.getPassword();
        System.out.println(username);
        System.out.println(password);
        return "/result.html";
    }


}
方式四的实体类 
package com.bh.po;

public class User {
    private String username;
    private String password;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}
posted @ 2023-06-05 14:19  liangkuan  阅读(277)  评论(0)    收藏  举报