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。
1.定义需要的请求参数的实体
User.java
[Java]
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package com.study.springmvc.model;
public class User {
private String username;
private String password;
private String email;
private int age;
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 getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
@Override
public String toString() {
return "User [username=" + username + ", password=" + password + ", email=" + email + ", age=" + age
+ ", address=" + address + "]";
}
}
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Address.java
[Java]
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package com.study.springmvc.model;
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 + "]";
}
}
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2. 在index.jsp页面编写传参的表单
[HTML]
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<!--POJO测试 begin -->
<br>
<form action="pojoTest/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="age"/>
<br>
city: <input type="text" name="address.city"/>
<br>
province: <input type="text" name="address.province"/>
<br>
<input type="submit" value="Submit"/>
</form>
<!--POJO测试 end -->
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3.编写handler
PojoTest.java
[Java]
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package com.study.springmvc.handlers;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import com.study.springmvc.model.User;
@RequestMapping("/pojoTest")
@Controller
public class PojoTest {
public static final String SUCCESS="success";
/**
* 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。
*/
@RequestMapping("/testPojo")
public String testPojo(User user) {
System.out.println("testPojo: " + user);
return SUCCESS;
}
}
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