Json3种解析方式

1.导包

 implementation 'com.google.code.gson:gson:2.8.6'implementation 'com.alibaba:fastjson:1.2.73'

2.使用

package com.example.imageloader2;import androidx.appcompat.app.AppCompatActivity;
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.util.Log;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.widget.LinearLayout;import com.alibaba.fastjson.JSON;
import com.google.gson.Gson;
import com.google.gson.JsonObject;import org.json.JSONObject;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;public class ThirdActivity extends AppCompatActivity {private static final String TAG = "ThirdActivity";private LinearLayout linearLayout;String data = "{\n" +"  \"paramz\": {\n" +"    \"feeds\": [\n" +"      {\n" +"        \"id\": 299076,\n" +"        \"oid\": 288340,\n" +"        \"category\": \"article\",\n" +"        \"data\": {\n" +"          \"subject\": \"荔枝新闻3.0：不止是阅读\",\n" +"          \"summary\": \"江苏广电旗下资讯类手机应用“荔枝新闻”于近期推出全新升级换代的3.0版。\",\n" +"          \"cover\": \"/Attachs/Article/288340/3e8e2c397c70469f8845fad73aa38165_padmini.JPG\",\n" +"          \"pic\": \"\",\n" +"          \"format\": \"txt\",\n" +"          \"changed\": \"2015-09-22 16:01:41\"\n" +"        }\n" +"      }\n" +"    ],\n" +"    \"PageIndex\": 1,\n" +"    \"PageSize\": 20,\n" +"    \"TotalCount\": 53521,\n" +"    \"TotalPage\": 2677\n" +"  }\n" +"}\n";String data2 = "{\n" +"    \"homeadlist\": [\n" +"        {\n" +"            \"id\": 1,\n" +"            \"imgurl\": \"/img/homead/a73b3f1d-0f14-429d-9d0f-70643fb0f0eb.jpg\",\n" +"            \"jumpflag\": 0,\n" +"            \"jumpurl\": \"\",\n" +"            \"posflag\": 1,\n" +"            \"remark\": \"1111\",\n" +"            \"cityid\": 1\n" +"        },\n" +"        {\n" +"            \"id\": 12,\n" +"            \"imgurl\": \"/img/homead/eb442fbf-49db-4ba6-a102-d781505f426d.jpg\",\n" +"            \"jumpflag\": 0,\n" +"            \"jumpurl\": \"\",\n" +"            \"posflag\": 2,\n" +"            \"remark\": \"\",\n" +"            \"cityid\": 1\n" +"        },\n" +"        {\n" +"            \"id\": 14,\n" +"            \"imgurl\": \"/img/homead/68109460-635d-4c5c-8be8-64d7c7889d18.jpg\",\n" +"            \"jumpflag\": 0,\n" +"            \"jumpurl\": \"http://shiranlife.kuaizhan.com/\",\n" +"            \"posflag\": 4,\n" +"            \"remark\": \"\",\n" +"            \"cityid\": 1\n" +"        }\n" +"    ]\n" +"}\n";@SuppressLint("SetJavaScriptEnabled")@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);linearLayout = new LinearLayout(this);WebView webView = new WebView(this);WebSettings settings = webView.getSettings();//让webView支持JSsettings.setJavaScriptEnabled(true);//加载百度网页webView.loadUrl("https://www.baidu.com");LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);lp.setMargins(50, 50, 50, 50);webView.setLayoutParams(lp);linearLayout.addView(webView);setContentView(linearLayout);List<HashMap<String, Object>> dataList = JsonUtils.getJsonList(data);for(HashMap map : dataList) {Log.d(TAG, "subject:"+map.get("subject")+", summary:"+ map.get("summary")+", cover:"+ map.get("cover"));}List<DataModel> dataList2 =  JsonUtils.getJsonList2(data);for(DataModel model : dataList2) {Log.d(TAG, "22---subject:"+model.getSubject()+", summary:"+ model.getSummary()+", cover:"+ model.getCover());}//Gson解析Homead homead = new Gson().fromJson(data2, Homead.class);Log.d(TAG, "size-333:"+homead.getHomeadlist().size());for(Homead.HomeadlistBean bean : homead.getHomeadlist()) {Log.d(TAG, "getId:"+ bean.getId());}//fastJson解析Homead homead2 = JSON.parseObject(data2, Homead.class);Log.d(TAG, "size-444:"+homead.getHomeadlist().size());for(Homead.HomeadlistBean bean : homead.getHomeadlist()) {Log.d(TAG, "getId---222:"+ bean.getId());}Homead.HomeadlistBean bean1 = new Homead.HomeadlistBean(1, "q");Homead.HomeadlistBean bean2 = new Homead.HomeadlistBean(2, "w");Homead.HomeadlistBean bean3 = new Homead.HomeadlistBean(3, "e");Homead.HomeadlistBean bean4 = new Homead.HomeadlistBean(4, "r");List<Homead.HomeadlistBean> homeadlist  = new ArrayList<>();homeadlist.add(bean1);homeadlist.add(bean2);homeadlist.add(bean3);homeadlist.add(bean4);Homead homead1 = new Homead();homead1.setHomeadlist(homeadlist);String h = JSON.toJSONString(homead1);Log.d(TAG, "h---555:"+ h);}
}

3.解析类
1）DataModel

package com.example.imageloader2;public class DataModel{public  String subject;public  String summary;public  String cover;public  String pic;public  String format;public  String changed;public void setSubject(String subject) {this.subject = subject;}public String getSubject() {return subject;}public void setSummary(String summary) {this.summary = summary;}public String getSummary() {return summary;}public void setCover(String cover) {this.cover = cover;}public String getCover() {return cover;}public void setPic(String pic) {this.pic = pic;}public String getPic() {return pic;}public void setFormat(String format) {this.format = format;}public String getFormat() {return format;}public void setChanged(String changed) {this.changed = changed;}public String getChanged() {return changed;}}

2）Homead

package com.example.imageloader2;import java.io.Serializable;
import java.util.List;public class Homead {public List<HomeadlistBean> getHomeadlist() {return homeadlist;}private List<HomeadlistBean> homeadlist;public void setHomeadlist(List<HomeadlistBean> homeadlist) {this.homeadlist = homeadlist;}public static class HomeadlistBean {public HomeadlistBean() {}public String getRemark() {return remark;}public HomeadlistBean(int id, String remark) {this.id = id;this.remark = remark;}public int getId() {return id;}/*** id : 1* imgurl : /img/homead/a73b3f1d-0f14-429d-9d0f-70643fb0f0eb.jpg* jumpflag : 0* jumpurl :* posflag : 1* remark : 1111* cityid : 1*/private int id;private String imgurl;private int jumpflag;private String jumpurl;private int posflag;private String remark;private int cityid;}
}

4.工具类

package com.example.imageloader2;import android.util.Log;import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;public class JsonUtils {private static final String TAG = "JsonUtils";/*** 系统的JSONObject， JSONArray*/public static List<HashMap<String, Object>> getJsonList(String json) {List<HashMap<String, Object>> dataList;dataList = new ArrayList<>();try {JSONObject rootObject = new JSONObject(json);JSONObject paramzObject = rootObject.getJSONObject("paramz");JSONArray feedsArray = paramzObject.getJSONArray("feeds");for (int i = 0; i < feedsArray.length(); i++) {JSONObject sonObject = feedsArray.getJSONObject(i);JSONObject dataObject = sonObject.getJSONObject("data");String subjectStr = dataObject.getString("subject");String summaryStr = dataObject.getString("summary");String coverStr = dataObject.getString("cover");HashMap<String, Object> map = new HashMap<>();map.put("subject", subjectStr);map.put("summary", summaryStr);map.put("cover", coverStr);dataList.add(map);}return dataList;} catch (JSONException e) {e.printStackTrace();}return null;}/*** Gson解析*/public static List<DataModel> getJsonList2(String json) {List<DataModel> dataList;dataList = new ArrayList<>();try {JSONObject rootObject = new JSONObject(json);JSONObject paramzObject = rootObject.getJSONObject("paramz");JSONArray feedsArray = paramzObject.getJSONArray("feeds");for (int i = 0; i < feedsArray.length(); i++) {JSONObject sonObject = feedsArray.getJSONObject(i);Log.d(TAG, "DATA:"+sonObject.getString("data"));DataModel model = new Gson().fromJson(sonObject.getString("data"), new TypeToken<DataModel>(){}.getType());dataList.add(model);}return dataList;} catch (JSONException e) {e.printStackTrace();}return null;}public static Homead getJsonList3(String json) {Homead homead = new Gson().fromJson(json, Homead.class);return homead;}
}

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