不同格式的json解析

一、基本数据格式

给服务端发送请求后，服务端会返回一连串的数据，这些数据在大部分情况下都是XML格式或者JSON格式。然后JSON相对XML来说解析相对方便一些，所以先说说JSON的解析。

JSON的基本数据格式有这几种：

1. 一个JSON对象

JSONObject

{
    "name": "胡小威",
    "age": 20,
    "male": true
}

2.一个JSON数组

JSONArray

[
    {
        "name": "胡小威",
        "age": 20,
        "male": true
    },
    {
        "name": "赵小亮",
        "age": 22,
        "male": false
    }
]
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3.复杂JSONObject

{
    "name": "胡小威",
    "age": 20,
    "male": true,
    "address": {
        "street": "岳麓山南",
        "city": "长沙",
        "country": "中国"
    }
}
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4. 复杂JSONArray

[
    {
        "name": "胡小威",
        "age": 20,
        "male": true,
        "address": {
            "street": "岳麓山南",
            "city": "长沙",
            "country": "中国"
        }
    },
    {
        "name": "赵小亮",
        "age": 22,
        "male": false,
        "address": {
            "street": "九州港",
            "city": "珠海",
            "country": "中国"
        }
    }
]
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5.更复杂的json

爱帮公交上扒取的数据

{
    "buses": {
        "bus": [
            {
                "last_foot_dist": "0",
                "time": "37",
                "segments": {
                    "segment": [
                        {
                            "line_name": "立珊专线(中南大学学生公寓-长沙火车站)",
                            "foot_dist": "362",
                            "stat_xys": "",
                            "stats": "岳麓山南;湖南师大;二里半;岳麓山北;市四医院;华图教育(太平街口);牛耳教育(南阳街口);韭菜园;曙光路口;长岛路口;长沙火车站",
                            "end_stat": "长沙火车站",
                            "line_xys": "",
                            "line_dist": "7535",
                            "start_stat": "岳麓山南"
                        }
                    ]
                },
                "foot_dist": "362",
                "dist": "7897"
            },
            {
                "last_foot_dist": "0",
                "time": "41",
                "segments": {
                    "segment": [
                        {
                            "line_name": "旅1路(科教新村-长沙火车站)",
                            "foot_dist": "337",
                            "stat_xys": "",
                            "stats": "岳麓山南;湖南师大;二里半;岳麓山北;市四医院;华图教育(太平街口);蔡锷中路口;韭菜园;乔庄;曙光路口;长岛路口;五一东村;车站路口;长沙火车站",
                            "end_stat": "长沙火车站",
                            "line_xys": "",
                            "line_dist": "7822",
                            "start_stat": "岳麓山南"
                        }
                    ]
                },
                "foot_dist": "337",
                "dist": "8159"
            }
        ]
    }
}
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二、解析

2.1. JSONObject解析

{
    "name": "胡小威",
    "age": 20,
    "male": true
}

package com.gblfy;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.JSONObject;
import com.gblfy.utils.FastJsonUtil;
import org.junit.Test;

import java.util.List;

public class JsonApplicationTests {

    //把JSON数据转换成指定的java对象
    @Test
    public void fastJsonTest() {
        Student st = new Student().builder()
                .name("雨昕")
                .age(2)
                .build();

        String json = FastJsonUtil.getBeanToJson(st);
        System.out.println("********对象转Json*********");
        System.out.println("json ::" + json);
        System.out.println("********Json转对象*********");
        Student newst = FastJsonUtil.getJsonToBean(json, Student.class);
        System.out.println("Name ::" + newst.getName());
        System.out.println("Age ::" + newst.getAge());
    }


    //解析JsonObject
    @Test
    public void parseJsonObject() {
        try {
            String json = "{\n" +
                    "    \"name\": \"胡小威\",\n" +
                    "    \"age\": 20,\n" +
                    "    \"male\": true\n" +
                    "}";

            System.out.println("*********单纯的从json数据中获取对应的值*********");
            JSONObject jb = JSON.parseObject(json);
            String name = jb.getString("name");
            int age = jb.getInteger("age");
            boolean male = jb.getBoolean("male");

            System.out.println("name:" + name);
            System.out.println("age:" + age);
            System.out.println("male:" + male);

            System.out.println("*********把JSON数据转换成指定的java对象*********");
            Student st = FastJsonUtil.getJsonToBean(json, Student.class);
            System.out.println("*********Student*********");

            System.out.println("name:" + st.getName());
            System.out.println("age:" + st.getAge());
            System.out.println("male:" + st.isMale());

            //接下来该干嘛干嘛
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    //解析JSONArray
    @Test
    public void parseJSONArray() {
        String json = "[\n" +
                "    {\n" +
                "        \"name\": \"胡小威\",\n" +
                "        \"age\": 20,\n" +
                "        \"male\": true\n" +
                "    },\n" +
                "    {\n" +
                "        \"name\": \"赵小亮\",\n" +
                "        \"age\": 22,\n" +
                "        \"male\": false\n" +
                "    }\n" +
                "]";
        try {

            System.out.println("*********把JSON数据转换成指定的java对象列表*********");
            List<Student> jsonToList = FastJsonUtil.getJsonToList(json, Student.class);
            for (Student st : jsonToList) {
                System.out.println("name: " + st.getName());
                System.out.println("age: " + st.getAge());
                System.out.println("male: " + st.isMale());
            }

            System.out.println("*********解析JSONArray*********");
            JSONArray jsonArray = JSON.parseArray(json);
            for (Object o : jsonArray) {
                Student st = (Student) o;
                System.out.println("name: " + st.getName());
                System.out.println("age: " + st.getAge());
                System.out.println("male: " + st.isMale());
            }

            //接下来该干嘛干嘛
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    //解析复杂JSONObject
    @Test
    public void parseJsonPerson() {
        String json = "{\n" +
                "    \"name\": \"胡小威\",\n" +
                "    \"age\": 20,\n" +
                "    \"male\": true,\n" +
                "    \"address\": {\n" +
                "        \"street\": \"岳麓山南\",\n" +
                "        \"city\": \"长沙\",\n" +
                "        \"country\": \"中国\"\n" +
                "    }\n" +
                "}";
        try {
            JSONObject jb = JSON.parseObject(json);
            String name = jb.getString("name");
            int age = jb.getInteger("age");
            boolean male = jb.getBoolean("male");

            JSONObject addressJSON = jb.getJSONObject("address");
            String street = addressJSON.getString("street");
            String city = addressJSON.getString("city");
            String country = addressJSON.getString("country");

            Address address = new Address(street, city, country);
            Student student = new Student(name, age, male, address);

            System.out.println("name: " + name);
            System.out.println("age: " + age);
            System.out.println("male: " + male);

            System.out.println("street: " + street);
            System.out.println("city: " + city);
            System.out.println("country: " + country);

        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    //解析复杂JSONArray
    @Test
    public void parseJsonArrayPerson() {
        String json="[\n" +
                "    {\n" +
                "        \"name\": \"胡小威\",\n" +
                "        \"age\": 20,\n" +
                "        \"male\": true,\n" +
                "        \"address\": {\n" +
                "            \"street\": \"岳麓山南\",\n" +
                "            \"city\": \"长沙\",\n" +
                "            \"country\": \"中国\"\n" +
                "        }\n" +
                "    },\n" +
                "    {\n" +
                "        \"name\": \"赵小亮\",\n" +
                "        \"age\": 22,\n" +
                "        \"male\": false,\n" +
                "        \"address\": {\n" +
                "            \"street\": \"九州港\",\n" +
                "            \"city\": \"珠海\",\n" +
                "            \"country\": \"中国\"\n" +
                "        }\n" +
                "    }\n" +
                "]";
        try {
            System.out.println("*********把JSON数据转换成指定的java对象列表*********");
            List<Student> jsonToList = FastJsonUtil.getJsonToList(json, Student.class);
            for (Student st : jsonToList) {
                System.out.println("name: " + st.getName());
                System.out.println("age: " + st.getAge());
                System.out.println("male: " + st.isMale());

                Address address = st.getAddress();
                System.out.println("street: " + address.getStreet());
                System.out.println("city: " + address.getCity());
                System.out.println("country: " + address.getCountry());

                Student student = new Student(st.getName(), st.getAge(), st.isMale(), address);
                System.out.println("student"+student.toString());
            }
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    @Test
    public void parseJSON(){
        String json="{\n" +
                "    \"buses\": {\n" +
                "        \"bus\": [\n" +
                "            {\n" +
                "                \"last_foot_dist\": \"0\",\n" +
                "                \"time\": \"37\",\n" +
                "                \"segments\": {\n" +
                "                    \"segment\": [\n" +
                "                        {\n" +
                "                            \"line_name\": \"立珊专线(中南大学学生公寓-长沙火车站)\",\n" +
                "                            \"foot_dist\": \"362\",\n" +
                "                            \"stat_xys\": \"\",\n" +
                "                            \"stats\": \"岳麓山南;湖南师大;二里半;岳麓山北;市四医院;华图教育(太平街口);牛耳教育(南阳街口);韭菜园;曙光路口;长岛路口;长沙火车站\",\n" +
                "                            \"end_stat\": \"长沙火车站\",\n" +
                "                            \"line_xys\": \"\",\n" +
                "                            \"line_dist\": \"7535\",\n" +
                "                            \"start_stat\": \"岳麓山南\"\n" +
                "                        }\n" +
                "                    ]\n" +
                "                },\n" +
                "                \"foot_dist\": \"362\",\n" +
                "                \"dist\": \"7897\"\n" +
                "            },\n" +
                "            {\n" +
                "                \"last_foot_dist\": \"0\",\n" +
                "                \"time\": \"41\",\n" +
                "                \"segments\": {\n" +
                "                    \"segment\": [\n" +
                "                        {\n" +
                "                            \"line_name\": \"旅1路(科教新村-长沙火车站)\",\n" +
                "                            \"foot_dist\": \"337\",\n" +
                "                            \"stat_xys\": \"\",\n" +
                "                            \"stats\": \"岳麓山南;湖南师大;二里半;岳麓山北;市四医院;华图教育(太平街口);蔡锷中路口;韭菜园;乔庄;曙光路口;长岛路口;五一东村;车站路口;长沙火车站\",\n" +
                "                            \"end_stat\": \"长沙火车站\",\n" +
                "                            \"line_xys\": \"\",\n" +
                "                            \"line_dist\": \"7822\",\n" +
                "                            \"start_stat\": \"岳麓山南\"\n" +
                "                        }\n" +
                "                    ]\n" +
                "                },\n" +
                "                \"foot_dist\": \"337\",\n" +
                "                \"dist\": \"8159\"\n" +
                "            }\n" +
                "        ]\n" +
                "    }\n" +
                "}";
        try {
            JSONObject jb = JSON.parseObject(json);
            String buses = jb.getString("buses");
            JSONObject jb2 = JSON.parseObject(buses);
            String bus2 = jb2.getString("bus");
            List<BusChild> bus = JSON.parseArray(bus2, BusChild.class);
            for (BusChild busChild : bus) {
                List<Segment> segmentList = busChild.getSegments();
                for (Segment segment : segmentList) {
                    
                }
            }
            
            // String bus = jb.getString("bus");


            // Bus bus = FastJsonUtil.getJsonToBean(buses, Bus.class);
            // BusChild busChild = bus.getBusChild();
            // List<Segment> segments = busChild.getSegments();
            // for (Segment segment : segments) {
            //
            // }
            


            // List<BusChild> busChildList = FastJsonUtil.getJsonToList(buses, BusChild.class);
            // for (BusChild busChild : busChildList) {
            //     List<Segment> segmentList = busChild.getSegments();
            //     for (Segment segment : segmentList) {
            //
            //     }
            // }
            //
            // JSONObject jb2 = JSON.parseObject(buses);
            //
            // String bus = jb2.getString("bus");

            // JSONObject jb3 = JSON.parseObject(bus);
            // String segments = jb3.getString("segments");
            //
            // List<Segment> jsonToList = FastJsonUtil.getJsonToList(segments, Segment.class);
            //
            // for (Segment segment : jsonToList) {
            //
            // }
            // for (BusChild busChild : jsonToList) {
            //     System.out.println(""+busChild.getLastFootDist());
            //     System.out.println(""+busChild.getTime());
            //     System.out.println(""+busChild.getFootDist());
            //     System.out.println(""+busChild.getDist());
            //
            //     List<Segments> segmentsList = busChild.getSegments();
            //     for (Segments segment : segmentsList) {
            //         System.out.println("line_name: "+segment.getLineName());
            //         System.out.println("foot_dist: "+segment.getFootDist());
            //         System.out.println("stat_xys: "+segment.getStatXys());
            //         System.out.println("stats: "+segment.getStats());
            //         System.out.println("end_stat: "+segment.getEndStat());
            //         System.out.println("line_xys: "+segment.getLineXys());
            //         System.out.println("line_dist: "+segment.getLineDist());
            //         System.out.println("start_stat: "+segment.getStartStat());
            //     }
            //
            // }
        } catch (JSONException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    //序列化时指定json的key值
    public static void main(String[] args) {
        Segment build = new Segment().builder()
                .foot_dist("123")
                .start_stat("456")
                .stats("https://files.jxasp.com/image/2").build();
        System.out.println("sss"+JSON.toJSONString(build));

    }
}

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`package com.gblfy.utils;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.TypeReference;

import java.util.List;
import java.util.Map;

public class FastJsonUtil {

/**
 * 功能描述：把JSON数据转换成指定的java对象
 *
 * @param jsonData JSON数据
 * @param clazz    指定的java对象
 * @return 指定的java对象
 */
public static <T> T getJsonToBean(String jsonData, Class<T> clazz) {
    return JSON.parseObject(jsonData, clazz);
}

/**
 * 功能描述：把java对象转换成JSON数据
 *
 * @param object java对象
 * @return JSON数据
 */
public static String getBeanToJson(Object object) {
    return JSON.toJSONString(object);
}

/**
 * 功能描述：把JSON数据转换成指定的java对象列表
 *
 * @param jsonData JSON数据
 * @param clazz    指定的java对象
 * @return List<T>
 */
public static <T> List<T> getJsonToList(String jsonData, Class<T> clazz) {
    return JSON.parseArray(jsonData, clazz);
}

/**
 * 功能描述：把JSON数据转换成较为复杂的List<Map<String, Object>>
 *
 * @param jsonData JSON数据
 * @return List<Map < String, Object>>
 */
public static List<Map<String, Object>> getJsonToListMap(String jsonData) {
    return JSON.parseObject(jsonData, new TypeReference<List<Map<String, Object>>>() {
    });
}

/**
 * List<T> 转 json 保存到数据库
 */
public static <T> String listToJson(List<T> ts) {
    String jsons = JSON.toJSONString(ts);
    return jsons;
}

/**
 * 两个类之间值的转换
 * 从object》》tClass
 *
 * @param object 有数据的目标类
 * @param tClass 转换成的类
 * @param <T>
 * @return 返回tClass类
 */
public static <T> T getObjectToClass(Object object, Class<T> tClass) {
    String json = getBeanToJson(object);
    return getJsonToBean(json, tClass);
}

/**
 * json 转 List<T>
 */
public static <T> List<T> jsonToList(String jsonString, Class<T> clazz) {
    @SuppressWarnings("unchecked")
    List<T> ts = JSONArray.parseArray(jsonString, clazz);
    return ts;
}
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}`、