Jackson

maven依赖

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.9.9</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.9.9</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.9.9</version>
</dependency>

控制器方法: 返回对象和List, 都会自动进行json转换

@Getmapping("/person")
@ResponseBody
public Person findByPersonId(Integer id){
    Person p=new Person();
    if(id==1){
        p.setName("lily");
        p.setAge(23);
    }else if(id==2){
        p.setName("smith");
        p.setAge(22);
    }
    return p;
}

@GetMapping("/persons")
public List<Person> findPerson(){
    List list=new ArrayList();
    Person p1=new Person();
    p1.setName("lily");
    p1.setAge(23);
    Person p2=new Person();
    p2.setName("smith");
    p2.setAge(22); 
    list.add(p1);
    list.add(p2);
}

Date对象怎么格式化

publlic class Person{
    private String name;
    private Integer age;
    @JsonFormat(pattern="yyyy-MM-dd HH:mm:ss",timezone="GMT+8")
    private Date birthday;
    ...setter getter
}