HarmonyOS开发实战：JSON组件使用方式-API

JSON类组件

模块	介绍
JSONValue	提供eftool中的JSON相关对象的类型定义
JSONObject	提供类Java的JSON对象的系列方法以及相互转换
JSONArray	提供类Java的JSON数组的系列方法以及相互转换
JSONArrayList	提供类Java的JSON数组的系列方法以及相互转换
JSONUtil	提供JSON转换一系列判断方法,废弃一部分方法

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-ddlet 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-ddlet 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);})