SpringMVC(十七-二十) ModelAttribute 注解

有点难理解。

修饰方法是表示在该控制器的所有目标方法执行前都执行该modelattribute注解的方法。

修饰参数是表示什么？修饰参数时@modelattributes(value="xxxx") User user 中的value值需要和@modelattribute修改的方法加入的键的值一致。

Controller Code:

package com.tiekui.springmvc.handlers;

import java.util.Map;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.ModelAttribute;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestParam;

import com.tiekui.springmvc.pojo.Address;

import com.tiekui.springmvc.pojo.User;

import com.tiekui.springmvc.pojo.UserNew;

@Controller

public class ModelAttributes {

    @RequestMapping("testModelAttribute")

    public String targetMethod(UserNew user){

        System.out.println("Target method" + user);

        return "afterModelAttributes";

    }

    @ModelAttribute

    public void getuser(@RequestParam(value="id") String id,Map<String, UserNew> map) {

        if ((id != null)) {

            UserNew user = new UserNew("tiekui","1234","zhoutiekui@huawei.com",30,1, new Address("guangzhou", "zhenzhen"));

            System.out.println("Get an object" + user);

            map.put("userNew", user);

        }

    }

}

Response View:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"

    pageEncoding="ISO-8859-1"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">

<title>Insert title here</title>

</head>

<body>

    userAge: ${requestScope.userNew.age}

</body>

</html>

View:

    <form action="testModelAttribute">

        <br>

        password : <input type="text" name="username" value="tiekui">

        <br>

        password : <input type="password" name="password" value="1234">

        <br>

        email : <input type="text" name="email" value="zhoutiekui@huawei.com">

        <br>

        age : <input type="text" name="age" value="18">

        <br>

        <input type="hidden" name="id" value="1">

        <br>

        Address Province: <input type="text" name="address.province" value="guangzhou">

        <br>

        Address City: <input type="text" name="address.city" value="shenzhen">

        <br>

        <input type="submit" value="Test ModelAttributes">

    </form>

POJO userNew:

POJO Address:

package com.tiekui.springmvc.pojo;

public class Address {

    private String province;

    private String city;

    public Address() {

        super();

    }

    public Address(String province, String city) {

        super();

        this.province = province;

        this.city = city;

    }

    @Override

    public String toString() {

        return "Address [province=" + province + ", city=" + city + "]";

    }

    public String getProvince() {

        return province;

    }

    public void setProvince(String province) {

        this.province = province;

    }

    public String getCity() {

        return city;

    }

    public void setCity(String city) {

        this.city = city;

    }

}

巴特西

SpringMVC(十七-二十) ModelAttribute 注解

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