前端页面

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>登录</title>
</head>
<body>
    <form action="/SpringMVC5_pojo_param/login.action">
        姓名：<input type="text" name="name"> <br />
        国家：<input type="text" name="address.country"> <br />
        城市：<input type="text" name="address.city"> <br />
        <button type="submit">登录</button> <br />
    </form>
</body>
</html>

Bean对象

UserBean :

package com.project.bean;

public class UserBean {

    private String name;
    private AddressBean address;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public AddressBean getAddress() {
        return address;
    }

    public void setAddress(AddressBean address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "UserBean [name=" + name + ", address=" + address + "]";
    }

}

AddressBean :

package com.project.bean;

public class AddressBean {
    private String country;
    private String city;

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    @Override
    public String toString() {
        return "AdressBean [country=" + country + ", city=" + city + "]";
    }

}

action

package com.project.action;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.project.bean.UserBean;

@Controller // sping容器要加载这个注解，才能将当前类识别为控制器
public class LoginAction{
    
    // 配置映射关系
    @RequestMapping("/login.action")
    public String login(UserBean user) {  // 参数课按需求自定义
        System.out.println("访问到 login ");
        System.out.println(user);
        // 跳转的页面
        return "index.jsp";
    }
}

前端 name 属性的值，与参数对象的属性一致，spring会自动转型并赋值（只是简单类型会自动转换）

简单参数获取

前端

<body>
    <form action="/SpringMVC4_param/login.action">
        <input type="text" name="id"> <br />
        <input type="text" name="name"> <br />
        <input type="password" name="pwd"> <br />
        <button type="submit">登录</button> <br />
    </form>
</body>

action


@Controller // sping容器要加载这个注解，才能将当前类识别为控制器
public class LoginAction{
    
    // 配置映射关系
    @RequestMapping("/login.action")
    public String login(String name, String pwd, int id) {  // 参数课按需求自定义
        System.out.println("访问到 login ");
        System.out.printf("name=%s, pwd=%s, id=%s", name, pwd, id);
        // 跳转的页面
        return "index.jsp";
    }
}