SpringMVC框架——数据绑定

使用POJO绑定参数

package com.sunjian.entity;

/**
 * @author sunjian
 * @date 2020/3/17 14:25
 */
public class User {
    private Integer id;
    private String name;
    private Integer age;
    private Address address;

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", address=" + address +
                '}';
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Address getAddress() {
        return address;
    }

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

package com.sunjian.entity;

/**
 * @author sunjian
 * @date 2020/3/17 14:26
 */
public class Address {
    private Integer id;
    private String name;

    @Override
    public String toString() {
        return "Address{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

package com.sunjian.controller;

import com.sunjian.entity.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @author sunjian
 * @date 2020/3/17 14:28
 */
@Controller
@RequestMapping(value = "/user")
public class UserHandler {
    @RequestMapping(value = "/add")
    public String add(User user){
        System.out.println(user);
        return "index";
    }
}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
<form action="/user/add" method="post">
    ID:<input type="text" name="id"/><br/>
    姓名:<input type="text" name="name"/><br/>
    年龄:<input type="text" name="age"/><br/>
    地址ID:<input type="text" name="address.id"/><br/>
    地址名:<input type="text" name="address.name"/><br/>
    <input type="submit" value="提交"/>
</form>
</body>
</html>

访问http://localhost:7777/add.jsp，输入人员信息后，点击提交按钮，打印结果

User{id=123, name='张三', age=31, address=Address{id=1234, name='12345'}}

基本数据类型

包装类

数组

List

Json

pom.xml

<dependency>
　　<groupId>com.alibaba</groupId>
　　<artifactId>fastjson</artifactId>
　　<version>1.2.18</version>
</dependency>

springmvc.xml

    <!-- 消息转换器 -->
    <mvc:annotation-driven>
        <mvc:message-converters register-defaults="true">
            <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"></bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

JSP

<!DOCTYPE html>
<html lang="en">
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<head>
    <title>Title</title>
    <script type="text/javascript" src="js/jquery-1.8.3.min.js"></script>
    <script type="text/javascript">
        $(function(){
            var user = {
                "id":1,
                "name":"张三"
            };
            $.ajax({
                url:"/data/json",
                data:JSON.stringify(user),
                type:"POST",
                contentType:"application/json;charset=UTF-8",
                dataType:"text",
                success:function(data){
                    alert(data);
                }
            })
        });
    </script>
</head>
<body>

</body>
</html>

controller

package com.sunjian.controller;

import com.sunjian.entity.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * @author sunjian
 * @date 2020/3/17 15:51
 */
@Controller
public class JsonController {
    @RequestMapping(value = "/json")
    @ResponseBody
    public String json(@RequestBody User user){
        System.out.println(user);
        return user.toString();
    }
}

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <!--中文乱码处理-->
  <filter>
    <filter-name>encodingFilter</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>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!--映射-->
  <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>
  </servlet>

  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
    
  <!-- js -->  
  <servlet-mapping>
    <servlet-name>default</servlet-name>
    <url-pattern>*.js</url-pattern>
  </servlet-mapping>
</web-app>

访问http://localhost:7777/json.jsp，打印

User{id=1, name='张三', age=null, address=null}

OK.

SpringMVC框架——数据绑定

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