目前解析json有三种工具:org.json(Java常用的解析),fastjson(阿里巴巴工程师开发的),Gson(Google官网出的),解析速度最快的是Gson,下载地址:https://code.google.com/p/google-gson/
什么是JSON:
JSON即JavaScript Object Natation, 它是一种轻量级的数据交换格式, 与XML一样, 是广泛被采用的客户端和服务端交互的解决方案.
JSON对象:
JSON 中对象(Object)以"{"开始, 以"}"结束. 对象中的每一个item都是一个key-value对, 表现为"key:value"的形式, key-value对之间使用逗号分隔. 如:{"name":"coolxing", "age"=24, "male":true, "address":{"street":"huiLongGuan", "city":"beijing", "country":"china"}}. JSON对象的key只能是string类型的, 而value可以是string, number, false, true, null, Object对象甚至是array数组, 也就是说可以存在嵌套的情况.
JSON数组:
JSON 数组(array)以"["开始, 以"]"结束, 数组中的每一个元素可以是string, number, false, true, null, Object对象甚至是array数组, 数组间的元素使用逗号分隔. 如["coolxing", 24, {"street":"huiLongGuan", "city":"beijing", "country":"china"}].
Gson的基本使用方法:
通过获取JsonReader对象解析JSON数据:
String jsonData = "[{"username":"arthinking","userId":001},{"username":"Jason","userId":002}]"; try{ JsonReader reader = new JsonReader(new StringReader(jsonData)); reader.beginArray(); while(reader.hasNext()){ reader.beginObject(); while(reader.hasNext()){ String tagName = reader.nextName(); if(tagName.equals("username")){ System.out.println(reader.nextString()); } else if(tagName.equals("userId")){ System.out.println(reader.nextString()); } } reader.endObject(); } reader.endArray(); } catch(Exception e){ e.printStackTrace(); }
通过把JSON数据映射成一个对象,使用Gson对象的fromJson()方法获取一个对象数组进行操作:
创建JSON数据对应的一个POJO对象User.java:
public class User { private String username ; private int userId ; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public int getUserId() { return userId; } public void setUserId(int userId) { this.userId = userId; } }
使用Gson对象获取User对象数据进行相应的操作:
Type listType = new TypeToken<LinkedList<User>>(){}.getType(); Gson gson = new Gson(); LinkedList<User> users = gson.fromJson(jsonData, listType); for (Iterator iterator = users.iterator(); iterator.hasNext();) { User user = (User) iterator.next(); System.out.println(user.getUsername()); System.out.println(user.getUserId()); }
如果要处理的JSON字符串只包含一个JSON对象,则可以直接使用fromJson获取一个User对象:
String jsonData = "{"username":"arthinking","userId":001}"; Gson gson = new Gson(); User user = gson.fromJson(jsonData, User.class); System.out.println(user.getUsername()); System.out.println(user.getUserId());
解析复杂实例:
数据格式:
- {
- "data": {
- "partnerteamlist": [
- {
- "pteamId": 72825,
- "ptitle": "随摄影/共6套服装/准爸准妈共拍/免费肚画/底片全送。",
- "pteamprice": 288
- },
- {
- "pteamId": 72598,
- "ptitle": "随摄影/拍摄200张/4本相册/品质拍摄/送全新婚纱。",
- "pteamprice": 2888
- },
- {
- "pteamId": 72613,
- "ptitle": "随摄影/送全新婚纱/多外景拍摄/服装不限数量/绝无二次消费!",
- "pteamprice": 3699
- },
- {
- "pteamId": 72638,
- "ptitle": "随摄影/服装不限数量/高品质拍摄260张/送全新婚纱。",
- "pteamprice": 4299
- },
- {
- "pteamId": 72716,
- "ptitle": "随摄影/3组服装造型/内外景拍摄/完全透明消费!",
- "pteamprice": 388
- }
- ],
- "liketeamlist": [
- {
- "lteamId": 65886,
- "ltitle": "爱丽尔婚纱摄影/2本相册/6套服装造型/拍摄不限最低拍摄150张。",
- "limage": "http://img.pztuan.com/upfile/team/2013/0712/201307120257551465.jpg",
- "lteamprice": 518,
- "lmarketprice": 3999
- },
- {
- "lteamId": 57133,
- "ltitle": "陶冶摄影/婚纱闺蜜/6组服装造型/拍摄不低于120张!",
- "limage": "http://img.pztuan.com/upfile/team/2013/0628/201306281115249737.jpg",
- "lteamprice": 580,
- "lmarketprice": 3380
- }
- ],
- "feedbacks": {
- "feedbacklist": [
- {
- "comment": "5分",
- "createtime": "2014.07.08 13:38",
- "score": 5,
- "username": "l***2"
- }
- ],
- "totalcount": 1,
- "totalscore": 5
- }
- },
- "err": null,
- "state": 1
- }
实体类(里面的成员变量和接口的返回值名称一 一对应才能保证解析正确):
- package com.pztuan.entity;
- import java.util.List;
- public class OtherDetail {
- private int state;
- private List<err> err;
- private OtherDetail2 data;
- public int getState() {
- return state;
- }
- public void setState(int state) {
- this.state = state;
- }
- public List<err> getErr() {
- return err;
- }
- public void setErr(List<err> err) {
- this.err = err;
- }
- public OtherDetail2 getData() {
- return data;
- }
- public void setData(OtherDetail2 data) {
- this.data = data;
- }
- public class OtherDetail2 {
- private List<partnerteamlist> partnerteamlist;
- private List<liketeamlist> liketeamlist;
- private List<feedbacks> feedbacks;
- public List<liketeamlist> getLiketeamlist() {
- return liketeamlist;
- }
- public void setLiketeamlist(List<liketeamlist> liketeamlist) {
- this.liketeamlist = liketeamlist;
- }
- public List<feedbacks> getFeedbacks() {
- return feedbacks;
- }
- public void setFeedbacks(List<feedbacks> feedbacks) {
- this.feedbacks = feedbacks;
- }
- public class partnerteamlist {
- private int pteamId;
- private String ptitle;
- private Double pteamprice;
- public int getPteamId() {
- return pteamId;
- }
- public void setPteamId(int pteamId) {
- this.pteamId = pteamId;
- }
- public String getPtitle() {
- return ptitle;
- }
- public void setPtitle(String ptitle) {
- this.ptitle = ptitle;
- }
- public Double getPteamprice() {
- return pteamprice;
- }
- public void setPteamprice(Double pteamprice) {
- this.pteamprice = pteamprice;
- }
- }
- public class liketeamlist {
- private int lteamId;
- private String ltitle;
- private String limage;
- private Double lteamprice;
- private Double lmarketprice;
- public int getLteamId() {
- return lteamId;
- }
- public void setLteamId(int lteamId) {
- this.lteamId = lteamId;
- }
- public String getLtitle() {
- return ltitle;
- }
- public void setLtitle(String ltitle) {
- this.ltitle = ltitle;
- }
- public String getLimage() {
- return limage;
- }
- public void setLimage(String limage) {
- this.limage = limage;
- }
- public Double getLteamprice() {
- return lteamprice;
- }
- public void setLteamprice(Double lteamprice) {
- this.lteamprice = lteamprice;
- }
- public Double getLmarketprice() {
- return lmarketprice;
- }
- public void setLmarketprice(Double lmarketprice) {
- this.lmarketprice = lmarketprice;
- }
- }
- public class feedbacks {
- private int totalcount;
- private Double totalscore;
- private List<feedbacklist> feedbacklist;
- public int getTotalcount() {
- return totalcount;
- }
- public void setTotalcount(int totalcount) {
- this.totalcount = totalcount;
- }
- public Double getTotalscore() {
- return totalscore;
- }
- public void setTotalscore(Double totalscore) {
- this.totalscore = totalscore;
- }
- public List<feedbacklist> getFeedbacklist() {
- return feedbacklist;
- }
- public void setFeedbacklist(List<feedbacklist> feedbacklist) {
- this.feedbacklist = feedbacklist;
- }
- public class feedbacklist {
- private String username;
- private String comment;
- private String createtime;
- private Double score;
- public String getUsername() {
- return username;
- }
- public void setUsername(String username) {
- this.username = username;
- }
- public String getComment() {
- return comment;
- }
- public void setComment(String comment) {
- this.comment = comment;
- }
- public String getCreatetime() {
- return createtime;
- }
- public void setCreatetime(String createtime) {
- this.createtime = createtime;
- }
- public Double getScore() {
- return score;
- }
- public void setScore(Double score) {
- this.score = score;
- }
- }
- }
- public List<partnerteamlist> getPartnerteamlist() {
- return partnerteamlist;
- }
- public void setPartnerteamlist(List<partnerteamlist> partnerteamlist) {
- this.partnerteamlist = partnerteamlist;
- }
- }
- public class err {
- private int code;
- private String msg;
- public int getCode() {
- return code;
- }
- public void setCode(int code) {
- this.code = code;
- }
- public String getMsg() {
- return msg;
- }
- public void setMsg(String msg) {
- this.msg = msg;
- }
- }
- }
注意上面内部类的运用。
解析:
- Gson gson = new Gson();
- OtherDetail d = gson.fromJson(jsonString,Detail.class);//取值的时候就从父类一层一层调子类成员(重要)
若出现引用异常,请查看Java内部类设计原则。
转自:http://blog.csdn.net/rain_butterfly/article/details/38404293?utm_source=tuicool&utm_medium=referral
参考:http://www.itzhai.com/android-to-parse-json-data-using-gson.html