json数据解析

[{"name":"音箱狂欢",imgUrl":"http://7mno4h.com2.z0.glb.qiniucdn.com/5608f3b5Nc8d90151.jpg","type":1},{"name":"手机国庆礼","imgUrl":"http://7mno4h.com2.z0.glb.qiniucdn.com/5608eb8cN9b9a0a39.jpg","type":1}]// 解析json方式:遇到{}就用JsonObject, 遇到[]就用JsonArray    如果json数据最外层是[]不是{} 用gson.jar解析就需要注意了

. 在使用Gson解析json字符串的时候，怎么建立JavaBean 是非常关键的。要注意一下三点， 
第一. 内部嵌套的类必须是static的，要不然解析会出错。
第二. 类里面的属性名必须跟json字段里面的key是一模一样的。
第三. 内部嵌套的用[]， 括起来的部分是一个List, 所以定义为public List<B> b. 而只用｛｝嵌套的就定义为public C c;
请看如下代码：
json字符串 :  
String json = {      "a":"100",      "b":[{"b1":"b_value1","b2":"b_value2"},            {"b1":"b_value1","b2":"b_value2"}]，    "c": {"c1":"c_value1","c2":"c_value2"}      }
方式一:原生解析法

 ArrayList<> mBanners = new ArrayList<>();   try {         JSONArray jsonArray = new JSONArray(string);       for (int i = 0; i < jsonArray.length(); i++) {            JSONObject jsonObject = jsonArray.getJSONObject(i);            BannerBean bean = new BannerBean();            bean.imgUrl = jsonObject.getString("imgUrl");           bean.name = jsonObject.getString("name");             mBanners.add(bean);                }      } catch (JSONException e) {              e.printStackTrace();    }

方式二:gson.jar解析法

Gson gson = new Gson();Type listType = new TypeToken<List<BannerBean2>>() {}.getType();ArrayList<BannerBean2> list = gson.fromJson(string, listType);for (int i = 0; i < list.size(); i++) {    BannerBean2 bannerBean2 = new BannerBean2();    bannerBean2.name = list.get(i).name;    Log.i(TAG, "name>>" + bannerBean2.name);}for (BannerBean2 bean2 : list) {    Log.i(TAG, "name=====>>" + bean2.name);    BannerBean2 b2= new BannerBean2();    b2.name = bean2.name;    Log.i(TAG, "name=====>>" + b2.name);}Type listType2 = new TypeToken<LinkedList<BannerBean2>>() {}.getType();LinkedList<BannerBean2> list2 = gson.fromJson(string, listType2);for (Iterator iterator = list2.iterator(); iterator.hasNext(); ) {    BannerBean2 bean2 = (BannerBean2) iterator.next();    Log.i(TAG, "bean2name>>" + bean2.name);}
public class BannerBean2 {        public  String name;        public  String imgUrl;}
Gson解析json，单独以及数组  这样的json数据，String myjson 如下：[{"id":"3","title":"\u56fe\u72473","pic":"\/Uploads\/201311\/5281ef5bdb576.jpg","lang":"1"},{"id":"2","title":"\u56fe\u72472","pic":"\/Uploads\/201402\/52fb27b0f08b0.jpg","lang":"1"},{"id":"1","title":"\u56fe\u72471","pic":"\/Uploads\/201402\/52fb27d992890.jpg","lang":"1"}]先建一个model：package com.zztt.model;public class ImageInfo { private String id; private String title; private String pic;  private String lang; public String getId() {  return id; } public void setId(String id) {  this.id = id; } public String getTitle() {  return title; } public void setTitle(String title) {  this.title = title; } public String getPic() {  return pic; } public void setPic(String pic) {  this.pic = pic; } public String getLang() {  return lang; } public void setLang(String lang) {  this.lang = lang; } } 然后，导包，不要倒错了 import java.lang.reflect.Type;import com.google.gson.Gson;import com.google.gson.reflect.TypeToken; 单个的这样：Gson gson = new Gson();ImageInfo imageInfo = gson.fromJson(myjson, ImageInfo.class); 数组这样：Type listType = new TypeToken<ArrayList<ImageInfo>>() {     }.getType();     Gson gson = new Gson();     ArrayList<ImageInfo> imageInfo = gson.fromJson(myjson, listType);