SpringMVC(七)：@RequestMapping下使用POJO對象綁定請求參數值

Spring MVC會按照請求參數名和POJO屬性名進行自動匹配，自動為該對象填充屬性值，支持級聯屬性。

如：address.city.dept.address.province等。

步驟一：定義Account.java，Address.java類：

package com.dx.springlearn.entities;

public class Account {
    private String username;
    private String password;
    private Integer 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 Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "Account [username=" + username + ", password=" + password + ", age=" + age + ", address=" + address
                + "]";
    }

}

package com.dx.springlearn.entities;

public class Address {
    private String province;
    private String city;
    private String details;

    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;
    }

    public String getDetails() {
        return details;
    }

    public void setDetails(String details) {
        this.details = details;
    }

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

}

步驟二：在HelloWord.java控制類內添加testPojo方法：

package com.dx.springlearn.handlers;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import com.dx.springlearn.entities.Account;

@Controller
@RequestMapping("class_requestmapping")
public class HelloWord {
    private static String SUCCESS = "success";

    @RequestMapping("/testPojo")
    public String testPojo(Account account) {
        System.out.println("testPojo: account:" + account);
        return SUCCESS;
    }
}

步驟三：在index.jsp中添加表單提交html腳本：

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

步驟四：測試

提交表單后，打印結果：

testPojo: account:Account [username=abc123, password=123456, age=28, address=Address [province=zhejiang, city=hangzhou, details=hangzhou huo che zhan]]