JSON_解析器Jackson_java对象转json_注解与JSON_解析器Jackson_java对象转json_List&Map

JSON_解析器Jackson_java对象转json_注解

　　　　1. 注解：

　　　　　　1. @JsonIgnore：排除属性。

　　　　　　2. @JsonFormat：属性值得格式化
　　　　　　　　@JsonFormat(pattern = "yyyy-MM-dd")

JSON_解析器Jackson_java对象转json_List&Map

　　1. 复杂java对象转换
　　　　1. List：数组

  @Test
    public void test3() throws Exception {
        //1.创建Person对象
        Person p = new Person();
        p.setName("张三");
        p.setAge(23);
        p.setGender("男");
        p.setBirthday(new Date());

        Person p1 = new Person();
        p1.setName("张三");
        p1.setAge(23);
        p1.setGender("男");
        p1.setBirthday(new Date());

        Person p2 = new Person();
        p2.setName("张三");
        p2.setAge(23);
        p2.setGender("男");
        p2.setBirthday(new Date());


        //创建List集合
        List<Person> ps = new ArrayList<Person>();
        ps.add(p);
        ps.add(p1);
        ps.add(p2);


        //2.转换
        ObjectMapper mapper = new ObjectMapper();
        String json = mapper.writeValueAsString(ps);
        // [{},{},{}]
        //[{"name":"张三","age":23,"gender":"男","birthday":"2018-07-07"},{"name":"张三","age":23,"gender":"男","birthday":"2018-07-07"},{"name":"张三","age":23,"gender":"男","birthday":"2018-07-07"}]
        System.out.println(json);
    }

　　　　2. Map：对象格式一致

@Test
    public void test4() throws Exception {
        //1.创建map对象
        Map<String,Object> map = new HashMap<String,Object>();
        map.put("name","张三");
        map.put("age",23);
        map.put("gender","男");


        //2.转换
        ObjectMapper mapper = new ObjectMapper();
        String json = mapper.writeValueAsString(map);
        //{"name":"张三","age":23,"gender":"男"}
        System.out.println(json);//{"gender":"男","name":"张三","age":23}
    }

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