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"%>            
     
    
      
               
        
                     
用户名:
         
                
                
                     
密码:
         
                
                
                     
性别:
                     
                男                      女               
                
                
                     
爱好：
                     
                看电视                打球                游泳            
                
                
                     
省：
         
                
                
                     
市:
         
                
                
                     
         
                
              
      
        
     
  

 

控制器类：

package com.proc;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;@Controllerpublic 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。