Json オブジェクトと Json 文字列のシリアル化と逆シリアル化を解析する例

var person = {"name": "张三", age: 23, 'gender': true};var ps = [{"name": "张三", "age": 23, "gender": true},
          {"name": "李四", "age": 24, "gender": true},
          {"name": "王五", "age": 25, "gender": false}];

var b='{"name":"2323","sex":"afasdf","age":"6262"}';//json字符串
 console.log(b);//{"name":"2323","sex":"afasdf","age":"6262"}
  alert(typeof(b));//string

       <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.8.3</version>
        </dependency>

//类属性,

private static final ObjectMapper MAPPER = new ObjectMapper();

//序列化-----userMapList是List<user>的格式，现在我们需要将List集合序列化为json字符串

MAPPER.writeValueAsString(userMapList);

//反序列化---json格式的字符串要反序列化为对象

MAPPER.readValue(你要反序列化的json字符串,new TypeReference<要反序列化为什么对象类型，例如 User.class>() {});

var person = {
username: ‘luohao’,
password: 123456,
location: ‘whu’
}

var json = JSON.stringify(person, [‘username’, ‘password’]);
console.log(json);
{“username”:“luohao”,“password”:123456}

var person = {
username: ‘luohao’,
password: 123456,
location: ‘whu’,
hometown: ‘wuhan’,
}
var json = JSON.stringify(person, function filter(key, value) {
switch(key) {
case ‘location’: return undefined;
case ‘hometown’: return undefined;
default: return value;
}
});
console.log(json);

{“username”:“luohao”,“password”:123456}

var person = {
username: ‘luohao’,
password: 123456,
location: {
province: ‘hubei’,
city: ‘wuhan’,
county: ‘qichun’
},
hometown: ‘wuhan’,
}
var json = JSON.stringify(person, function filter(key, value) {
switch(key) {
case ‘hometown’: return undefined;
default: return value;
}
});
console.log(json);
{“username”:“luohao”,“password”:123456,“location”:{“province”:“hubei”,“city”:“wuhan”,“county”:“qichun”}}