1、新增jackson依賴

compile group: 'com.fasterxml.jackson.core', name: 'jackson-databind', version: '2.9.0'

2、開啟<mvc:annotation-driven /> 註解

3、編寫JavaBean

package cn.bjut.entity;

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class Person {
    private String name;
    private
 
 int age;

    public Person() {
    }

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return
 
 age;
    }

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

    @Override
    public String toString() {
        return "Person{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

4、編寫Controller

    @ResponseBody
    @RequestMapping
 
(value = "/json", method = RequestMethod.GET)
    public Person test1() {
        Person person = new Person();
        person.setAge(25);
        person.setName("你大爺");
        return person;
    }

• 如果沒有配置Person類的@XmlRootElement註解,那麼只會返回JSON資料,無論Accept是什麼
• 如果配置了Person類的XML註解,那麼如果Accept含有applicatin/xml, 就會返回xml資料
  因為瀏覽器預設包含了Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8 所以直接訪問會返回XML資料
• 如果改為accept: "application/json",即可返回JSON資料