SpringMVC系列（四）使用 POJO 对象绑定请求参数值-白红宇

SpringMVC系列（四）使用 POJO 对象绑定请求参数值

阅读量：7089 次

发布时间：2019-06-28

本文共 2980 字，大约阅读时间需要 9 分钟。

在实际开发中如果参数太多就不能使用@RequestParam去一个一个的映射了，需要定义一个实体参数对象(POJO)来映射请求参数。Spring MVC 会按请求参数名和 POJO 属性名进行自动匹配，自动为该对象填充属性值。支持级联属性。如：address.province、address.city等。

具体步骤如下：

1.定义需要的请求参数的实体

User.java

1 package com.study.springmvc.model; 2  3 public class User { 4      5     private String username; 6     private String password; 7  8     private String email; 9     private int age;10     11     private Address address;12 13     public String getUsername() {14         return username;15     }16 17     public void setUsername(String username) {18         this.username = username;19     }20 21     public String getPassword() {22         return password;23     }24 25     public void setPassword(String password) {26         this.password = password;27     }28 29     public String getEmail() {30         return email;31     }32 33     public void setEmail(String email) {34         this.email = email;35     }36 37     public int getAge() {38         return age;39     }40 41     public void setAge(int age) {42         this.age = age;43     }44 45     public Address getAddress() {46         return address;47     }48 49     public void setAddress(Address address) {50         this.address = address;51     }52 53     @Override54     public String toString() {55         return "User [username=" + username + ", password=" + password + ", email=" + email + ", age=" + age56                 + ", address=" + address + "]";57     }58 59 }

Address.java

1 package com.study.springmvc.model; 2  3 public class Address { 4  5     private String province; 6     private String city; 7  8     public String getProvince() { 9         return province;10     }11 12     public void setProvince(String province) {13         this.province = province;14     }15 16     public String getCity() {17         return city;18     }19 20     public void setCity(String city) {21         this.city = city;22     }23 24     @Override25     public String toString() {26         return "Address [province=" + province + ", city=" + city + "]";27     }28     29 }

2. 在index.jsp页面编写传参的表单

1 
       2 
 3 
     
       4     username: 
       5     
      
 6     password: 
       7     
      
 8     email: 
       9     
      
10     age: 
      11     
      
12     city: 
      13     
      
14     province: 
      15     
      
16     
      17 
     
18

3.编写handler

PojoTest.java

1 package com.study.springmvc.handlers; 2  3 import org.springframework.stereotype.Controller; 4 import org.springframework.web.bind.annotation.RequestMapping; 5  6 import com.study.springmvc.model.User; 7  8 @RequestMapping("/pojoTest") 9 @Controller10 public class PojoTest {11 12     public static final String SUCCESS="success";13     14     /**15      * Spring MVC 会按请求参数名和 POJO 属性名进行自动匹配，16      * 自动为该对象填充属性值。支持级联属性。17      * 如：address.province、address.city等。18      */19     @RequestMapping("/testPojo")20     public String testPojo(User user) {21         System.out.println("testPojo: " + user);22         return SUCCESS;23     }24 }

转载地址：http://gkfql.baihongyu.com/

你可能感兴趣的文章