HarmonyOS开发实战：JSON组件使用方式-API

 JSON类组件

JSON组件使用API

1.JSONValue的解释

• 定义了JSON相关类的value的取值范围

2.JSONObject的方法

• parse json字符串转换为JSONObject对象

let userList = new Array<User>();
    userList.push(new User('2345', '测试用户1'));
    userList.push(new User('7844', '测试用户2'));
    let person = new Person('测试', 12, true, new Date(), new User("uuid", "打撒吃的是草动次打次"), userList);
    let j = JSONObject.toJSONString(person);
    let f = JSONObject.parse(j);

• parseObject json字符串转换为实体对象

let userList = new Array<User>();
    userList.push(new User('2345', '测试用户1'));
    userList.push(new User('7844', '测试用户2'));
    let person = new Person('测试', 12, true, new Date(), new User("uuid", "打撒吃的是草动次打次"), userList);
    let j = JSONObject.toJSONString(person);
    let o = JSONObject.parseObject<Person>(j);

• toJSONString Object对象换为json字符串

  let userList = new Array<User>();
    userList.push(new User('2345', '测试用户1'));
    userList.push(new User('7844', '测试用户2'));
    let person = new Person('测试', 12, true, new Date(), new User("uuid", "打撒吃的是草动次打次"), userList);
    let j = JSONObject.toJSONString(person);

• from 实体对象转换为JSONObject对象

 let userList = new Array<User>();
    userList.push(new User('2345', '测试用户1'));
    userList.push(new User('7844', '测试用户2'));
    let person = new Person('测试', 12, true, new Date(), new User("uuid", "打撒吃的是草动次打次"), userList);
    let j = JSONObject.from<Person>(person);

• toString 将本对象转换成json字符串

let jsonObj = new JSONObject();
    jsonObj.set("id", "100010");
    jsonObj.set("age", 27);
    jsonObj.set("sex", true);
    jsonObj.set("birth", new Date());
    let user = new JSONObject();
    user.set("uid", "121212");
    user.set("uName", "测试\\\"套对象");
    jsonObj.set("user", user);
    jsonObj.set("test", null);
    jsonObj.set("person", new User('实体id', '实体name'));
    jsonObj.set("name", "test字符串");
    let st = jsonObj.toString();

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3.JSONArray的方法

• parse json字符串转换为JSONArray对象

 let userList = new Array<User>();
    userList.push(new User('2345', '测试用户1'));
    userList.push(new User('7844', '测试用户2'));
    userList.push(new User('1314', '测试用户3'));
    userList.push(new User('5210', '测试用户4'));
    let s = JSONArray.toJSONString(userList);
    let jsArr = JSONArray.parse(s);

• toJSONString 集合对象转换为json字符串

let userList = new Array<User>();
    userList.push(new User('2345', '测试用户1'));
    userList.push(new User('7844', '测试用户2'));
    userList.push(new User('1314', '测试用户3'));
    userList.push(new User('5210', '测试用户4'));
    let s = JSONArray.toJSONString(userList);

• from 实体集合转换为JSONArray对象

let userList = new Array<User>();
    userList.push(new User('2345', '测试用户1'));
    userList.push(new User('7844', '测试用户2'));
    userList.push(new User('1314', '测试用户3'));
    userList.push(new User('5210', '测试用户4'));
    let jarr = JSONArray.from(userList);

• toString 将本对象转换成json字符串

let arr = new JSONArray();
    arr.push(1);
    arr.push("cccc");
    arr.push("123");
    arr.push("aaaaa\\\"34343434");
    arr.push("2223\"dasdass");
    arr.push(new Date());
    arr.push(true);
    arr.push(null);
    arr.push(new User("10010", "实体数据"));
    let str = arr.toString();

• parseArray json字符串转换为实体对象集合(1.1.12+)

class TestDDD {
      threeMonthRate?: string;
      moduleName?: string;
      productName?: string;
      marketPatter?: string;
      labelListJson?: site;
    }
    class site {
      site1?: site1;
    }
    class site1 {
      labelType?: string;
      labelValue?: string;
      labelName?: string;
      labelLocation?: string;
    }
    let str1 = '[{"threeMonthRate":null,"moduleName":"loan","productName":"网E贷","marketPatter":"随借随还，最高20万，利率低至8折起","labelListJson":{"site1":{"labelType":0,"labelValue":"网E贷","labelName":"产品名称:123","labelLocation":true}}},{"threeMonthRate":null,"moduleName":"loan","productName":"烟草贷","marketPatter":"无需抵押，无需担保，当天放款，随借随还","labelListJson":{"site1":{"labelType":12,"labelValue":"烟草贷","labelName":"产品名称","labelLocation":false}}}]';
    let array = JSONArray.parseArray<TestDDD>(str1);
    array.forEach(item => {
      this.msg += item.labelListJson?.site1?.labelName + " ";
    })

4.JSONArrayList的方法

• parse json字符串转换为JSONArrayList对象

 let userList = new ArrayList<User>();
    userList.add(new User('2345', '测试用户1'));
    userList.add(new User('7844', '测试用户2'));
    userList.add(new User('1314', '测试用户3'));
    userList.add(new User('5210', '测试用户4'));
    let s = JSONArrayList.toJSONString(userList);
    let jsArr = JSONArrayList.parse(s);

• toJSONString 集合对象转换为json字符串

 let userList = new ArrayList<User>();
    userList.add(new User('2345', '测试用户1'));
    userList.add(new User('7844', '测试用户2'));
    userList.add(new User('1314', '测试用户3'));
    userList.add(new User('5210', '测试用户4'));
    let s = JSONArrayList.toJSONString(userList);

• from 实体集合转换为JSONArrayList对象

 let userList = new ArrayList<User>();
    userList.add(new User('2345', '测试用户1'));
    userList.add(new User('7844', '测试用户2'));
    userList.add(new User('1314', '测试用户3'));
    userList.add(new User('5210', '测试用户4'));
    let jarr = JSONArrayList.from(userList);

• toString 将本对象转换成json字符串

let arr = new JSONArrayList();
    arr.add(1);
    arr.add("cccc");
    arr.add("123");
    arr.add("aaaaa\\\"34343434");
    arr.add("2223\"dasdass");
    arr.add(new Date());
    arr.add(true);
    arr.add(null);
    arr.add(new User("10010", "实体数据"));
    let str = arr.toString();

• parseArrayList json字符串转换为实体对象集合(1.1.12+)

 class TestDDD {
      threeMonthRate?: string;
      moduleName?: string;
      productName?: string;
      marketPatter?: string;
      labelListJson?: site;
    }
    class site {
      site1?: site1;
    }
    class site1 {
      labelType?: string;
      labelValue?: string;
      labelName?: string;
      labelLocation?: string;
    }
    let str1 = '[{"threeMonthRate":null,"moduleName":"loan","productName":"网E贷","marketPatter":"随借随还，最高20万，利率低至8折起","labelListJson":{"site1":{"labelType":0,"labelValue":"网E贷","labelName":"产品名称:123","labelLocation":true}}},{"threeMonthRate":null,"moduleName":"loan","productName":"烟草贷","marketPatter":"无需抵押，无需担保，当天放款，随借随还","labelListJson":{"site1":{"labelType":12,"labelValue":"烟草贷","labelName":"产品名称","labelLocation":false}}}]';
    let array = JSONArrayList.parseArrayList<TestDDD>(str1);
    array.forEach(item => {
      this.msg += item.labelListJson?.site1?.labelName + " ";
    })

5.JSONUtil的方法

• toJSONString 将传入的json对象格式化成json字符串,第二个参数为如果数据有日期类型时是否传入转换格式,不传默认为yyyy-MM-dd

let userList = new Array<User>();
    userList.push(new User('2345', '测试用户1'));
    userList.push(new User('7844', '测试用户2'));
    let person = new Person('测试', 12, true, new Date(), new User("uuid", "打撒吃的是草动次打次"), userList);
    //第二个参数为如果数据有日期类型时是否传入转换格式,不传默认为yyyy-MM-dd
    let str1 = JSONUtil.toJSONString(person,DateConst.YMD_HLINE_HMS);

• parse 将传入的json字符串格式化为Object对象

 let person = new Person('测试', 12, new Date(), new User("101291021", "打撒吃的是草动次打次"));
    let str = JSONUtil.toJSONString(person);
    console.log(str)
    JSONUtil.parse(str);

• parseObject 将传入的json字符串格式化为指定的实体对象,如果实体中有日期类型可以传入格式化format,不传默认为yyyy-MM-dd

let userList = new Array<User>();
    userList.push(new User('2345', '测试用户1'));
    userList.push(new User('7844', '测试用户2'));
    let person = new Person('测试', 12, true, new Date(), new User("uuid", "打撒吃的是草动次打次"), userList);
    //第二个参数为如果数据有日期类型时是否传入转换格式,不传默认为yyyy-MM-dd
    let str1 = JSONUtil.toJSONString(person,DateConst.YMD_HLINE_HMS);
    let p = JSONUtil.parseObject<Person>(str1,DateConst.YMD_HLINE_HMS);

• parseArray 将传入的json字符串格式化为指定的实体对象集合,如果实体中有日期类型可以传入格式化format,不传默认为yyyy-MM-dd

 let listStr = JSONUtil.toJSONString(userList);
     let uList = JSONUtil.parseArray<User>(listStr);
     uList.forEach(item => {
       Logger.error(item.id, item.name);
     })

• parseStringArray 将字符串格式Array转换成Array数组

• isBoolean 判断传入的字符串是否是布尔类型

• isJSONStringArray 判断是否是字符串格式Array

• isJSONString 判断是否是字符串格式json

• isNumber 是否是字符串