java解析器之Json解析

package sample.org.jasen.learn10.testJson;

import sample.org.json.JSONArray;
import sample.org.json.JSONObject;


public class TestJson {
    public static void main(String[] args) {
        JSONObject object = new JSONObject();
        object.put("firstName","John");
        object.put("lastName","Jack");
        object.put("age",13);
        object.put("sex","male");
        JSONObject address = new JSONObject();
        address.put("streetAddress", "宝盛北里西区28号");
        address.put("city", "北京");
        address.put("state", "北京");
        address.put("postalCode", "100019");
        object.put("address",address);
        JSONArray phoneNumber = new JSONArray();
        JSONObject number1 = new JSONObject();
        number1.put("type", "home");
        number1.put("number", " 10086");
        phoneNumber.put(number1);
        JSONObject number2 = new JSONObject();
        number2.put("type", "fax");
        number2.put("number", " 10010");
        phoneNumber.put(number2);
        object.put("phoneNumber", phoneNumber);
        System.out.println(object);
    }
}

运行结果：{"firstName":"John","lastName":"Jack","address":{"streetAddress":"宝盛北里西区28号","city":"北京","postalCode":"100019","state":"北京"},"phoneNumber":[{"number":" 10086","type":"home"},{"number":" 10010","type":"fax"}],"sex":"male","age":13}

解析代码：

package sample.org.jasen.learn10.testJson;

import sample.org.json.JSONArray;
import sample.org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;


public class TestJson2 {
    public static void main(String[] args) {
        String str = "{\"firstName\":\"John\",\"lastName\":\"Smith\",\"address\":{\"streetAddress\":\"宝盛北里西区28号\",\"city\":\"北京\",\"postalCode\":\"100019\",\"state\":\"北京\"},\"phoneNumber\":[{\"number\":\" 10086\",\"type\":\"home\"},{\"number\":\" 10010\",\"type\":\"fax\"}],\"sex\":\"male\",\"age\":25}\n";
        User user = parserUser(str);
        System.out.println(toJSONString(user));
    }
    private static String toJSONString(User user){//将对象转化成Json格式
        JSONObject object = new JSONObject();
        object.put("firstName",user.getFirstName());
        object.put("lastName",user.getLastName());

        JSONObject object1 = new JSONObject();
        Address address = new Address();
        object1.put("streetAddress",address.getStreetAddress());
        object1.put("city",address.getCity());

        JSONArray objects = new JSONArray();
        List phonelist = user.getPhonelist();
        for (Phone p:
             phonelist) {
            JSONObject object2 = new JSONObject();
            object2.put("type",p.getType()).put("number",p.getNum());
            objects.put(object2);
        }
        object.put("phoneNumber",objects);
        return  object.toString();

    }
    private static User parserUser(String str){
        JSONObject object = new JSONObject(str);//解析时注意将文件放入参数中
        User user = new User();
        user.setFirstName(object.optString("firstName"));
        user.setLastName(object.optString("lastName"));
        user.setAge(object.optInt("age"));

        JSONObject object1 = object.optJSONObject("address");
        Address address  =  new Address();
        address.setStreetAddress(object1.optString("streetAddress"));
        address.setCity(object1.optString("city"));
        address.setPostalCode(object1.optString("postalCode"));
        address.setState(object1.optString("state"));
        user.setAddress(address);

        List phones = new ArrayList<>();
        JSONArray phoneNumber = object.optJSONArray("phoneNumber");
        for (int i = 0; i < phoneNumber.length(); i++) {
            JSONObject object2 = phoneNumber.optJSONObject(i);
            Phone phone = new Phone();
            phone.setNum( object2.optString("type"));
            phone.setType( object2.optString("number"));
            phones.add(phone);
        }
        user.setPhonelist(phones);
    return user;
    }
}