POJO 对象绑定请求参数值

今天药忘吃喽~ 2022-06-17 14:08 171阅读 0赞

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。

ex:

添加如下的表单:

form action="springmvc/testPojo" method="post">
        username:<input type="text" name="username"/>
        <br>
        password:<input type="password" name="password"/>
        <br>
        email:<input type="text" name="email"/>
        <br>
        age:<input type="text" name="Submit">
        <br>
        city:<input type="text" name="address.city">
        <br>
        province:<input type="text" name="address.province">
        <br>
        <input type="submit" value="Submit">
    </form>

添加实体类:

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 + '\'' +
                    '}';
        }
    }

public class User {
        private String username;
        private String password;
        private String email;
        private int age;
        private Address address;
    
        public Address getAddress() {
            return address;
        }
    
        public void setAddress(Address address) {
            this.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 getEmail() {
            return email;
        }
    
        public void setEmail(String email) {
            this.email = email;
        }
    
        public int getAge() {
            return age;
        }
    
        public void setAge(int age) {
            this.age = age;
        }
    
        @Override
        public String toString() {
            return "User{" +
                    "username='" + username + '\'' +
                    ", password='" + password + '\'' +
                    ", email='" + email + '\'' +
                    ", age=" + age +
                    ", address=" + address +
                    '}';
        }
    }

@RequestMapping("/springmvc")
    @Controller
    public class HelloWorld {
     @RequestMapping("/testPojo")
        public String  testPojo(User user){
            System.out.println("testPojo:"+user);
            return "success";
        }
    }

当表单提交的时候，对象就被赋上了值

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[Center]: /images/20220617/7ba59ec6de484f128ef1e0eb5debdefc.png