spring mvc-POJO传参方式

最新推荐文章于 2024-10-29 11:24:50 发布

转载最新推荐文章于 2024-10-29 11:24:50 发布 · 55 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/arrows/p/10523837.html

本文详细介绍了在Spring MVC框架下，如何使用级联属性和数组属性进行POJO对象的数据绑定，包括地址信息的级联注入和多选爱好的数组属性处理，展示了具体的Java代码实现及JSP页面元素。

https://www.cnblogs.com/caoyc/p/5635640.html

有两POJO类：

Address.java：

package com.proc;

public class Address {
    
    private String province;
    private String 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;
    }
    @Override
    public String toString() {
        return "Address [province=" + province + ", city=" + city + "]";
    }
}

User.java：

package com.proc;

public class User {
    
    private String username;
    private String password;
    private String gender;
    private String hobby;
    private Address address;
    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;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public String getHobby() {
        return hobby;
    }
    public void setHobby(String hobby) {
        this.hobby = hobby;
    }
    public Address getAddress() {
        return address;
    }
    public void setAddress(Address address) {
        this.address = address;
    }
    @Override
    public String toString() {
        return "User [username=" + username + ", password=" + password
                + ", gender=" + gender + ", hobby=" + hobby + ", address="
                + address + "]";
    }
}

jsp页面：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8" contentType="text/html; charset=utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>

  </head>
  
  <body>
    <form action="testPOJO" method="post">
    <table>
        <tr>
            <td>用户名:</td><td><input type="text" name="username"/></td>
        </tr>
        <tr>
            <td>密码:</td><td><input type="password" name="password"/></td>
        </tr>
        <tr>
            <td>性别:</td>
            <td>
                <input type="radio" checked="checked" name="gender" value="male"/>男   
                   <input type="radio" name="gender" value="female"/>女
               </td>
        </tr>
        <tr>
            <td>爱好：</td>
            <td>
                <input type="checkbox" name="hobby" value="tv">看电视
                <input type="checkbox" name="hobby" value="ball">打球
                <input type="checkbox" name="hobby" value="swimming">游泳
            </td>
        </tr>
        <tr>
            <td>省：</td><td><input type="text" name="address.province"/></td>
        </tr>
        <tr>
            <td>市:</td><td><input type="text" name="address.city"/></td>
        </tr>
        <tr>
            <td></td><td><input type="submit" value="提交"></td>
        </tr>

       </table>
    
    </form>
  </body>
</html>

控制器类：

package com.proc;

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

@Controller
public class Test {

    @RequestMapping("/testPOJO")
    public String testPOJO(User user){
        System.out.println(user);
        return "hello";
    }
    
}

测试：

1、进入jsp页面：

2、点击提交后，控制台输出：

User [username=caoyc, password=123456, gender=male, hobby=tv,swimming, address=Address [province=sichuan, city=chengdu]]

总结：

这里对应address属性使用的是级联属性。

POJO注入数组属性：

上面我们看到hobby是一个多选项。那么可以将hobby设为一个String[]类型的数组。设置后再次：

@RequestMapping("/testPOJO")
public String testPOJO(User user){
    System.out.println(user);
    System.out.println(Arrays.toString(user.getHobby()));
    return "hello";
}

输出结果：

User [username=caoyc, password=123456, gender=male, hobby=[Ljava.lang.String;@c3d34, address=Address [province=sichuan, city=chengdu]][tv, swimming]

上面如果输入中文，会出现乱码情况。

转载于:https://www.cnblogs.com/arrows/p/10523837.html