JSON解析&JSON

JSONObject解析对象的类构造方法：|--JSONObject(Stringsource)：把一个字符串映射成对应的JSONObject对象。|--JSONObject(Mapmap)：把一个map集合映射成对应的JSONObject对象|--JSONObject()：构造一个空的JSONObject对象|--JSONObject(Objectbean)：把任意对象转变成json对象----bean必须定义在自己的文件中常用方法：|--get***(Stringname)：根据name获得对应的值，如果不存在则抛出异常(***代表booleandoubleintlongstring)|--opt***(Stringname)：根据name获得对应的值，如果不存在则返回null,0,false(***代表booleandoubleintlongstring)|--opt***(Stringname,***value)：根据name获得对应的值，如果不存在则返回value(***代表booleandoubleintlongstring)|--put(Stringkey,***value):设置对象中的键值对，如果已经存在key则覆盖|--getJSONObject(Stringname)：根据name获得对应的JSONObject对象|--getJSONArray(Stringname)：根据name获得相应的JSONArray对象JSONArray解析数组的类构造方法：|--JSONArray(Collectioncollection)：把集合映射成对应的JSONArray对象|--JSONArray(Stringsource)：把字符串转成一个JSON对象常用方法：|--getJSONObject(intindex)：根据对应的下标返回一个JSONObject对象|--getJSONArray(intindex)：根据对应的下标返回一个JSONArray对象|--length()：返回当前JSONArray里面对象的个数|--get|opt***()：同上代码示意：解析字符串代码:

importjava.util.ArrayList;

importjava.util.List;

importorg.json.JSONArray;

importorg.json.JSONObject;

/**

*利用JSON解析

*

*@authorMixm

*@date2015年10月10日上午11:37:45

*/

publicclassTest02{

publicstaticvoidmain(String[]args)throwsException{

Stringsource="{'name':'Mixm','gender':'男','age':21,'hobby':[{'name':'basketball'},{'name':'football'}]}";

JSONObjectjObject=newJSONObject(source);

System.out.println(jObject);

Personp=newPerson();

p.setName(jObject.getString("name"));

p.setGender(jObject.getString("gender"));

p.setAge(jObject.getInt("age"));

JSONArrayjArray=jObject.getJSONArray("hobby");

Hobbyhobby=newHobby();

List<String>list=newArrayList<>();

for(inti=0;i<jArray.length();i++){

JSONObjectobj=jArray.getJSONObject(i);

list.add(obj.getString("name"));

}

hobby.setList(list);

p.setHobby(hobby);

System.out.println(p);

}

}

Person里自定义的属性:

privateStringname;

privateStringgender;

privateintage;

privateHobbyhobby;

Hobby类属性：

privateList<String>list;

解析网络上的JSON：1、先利用网络请求获得字符串2、解析字符串

importjava.io.BufferedReader;

importjava.io.InputStreamReader;

importjava.net.HttpURLConnection;

importjava.net.URL;

importjava.util.ArrayList;

importjava.util.List;

importorg.json.JSONArray;

importorg.json.JSONException;

importorg.json.JSONObject;

publicclassJSONParser{

publicstaticvoidmain(String[]args)throwsException{

Stringpath="http://api2.hichao.com/new_forum/status?ga/new_forum/status&forum_ids=&gv=72&gi=e4b6f3f836bdb59c&access_token=&gos=5.5.2&p=Galaxy+S2+-+4.1.1+-+API+16+-+480x800_1&gc=wandoujia&gn=mxyc_adr&gf=android&gs=";

JSONDjd=getData(path);

System.out.println(jd);

}

publicstaticJSONDgetData(Stringpath)throwsJSONException{

JSONObjectjsonObject1=newJSONObject(getJSON(path));

JSONDjd=newJSOND();

jd.setMessage(jsonObject1.getString("message"));

Datasdata=newDatas();

JSONObjectjsonObject2=jsonObject1.getJSONObject("data");

List<Item>list=newArrayList<>();

JSONArrayjArray=jsonObject2.getJSONArray("items");

for(inti=0;i<jArray.length();i++){

Itemitem=newItem();

JSONObjectjsonObject3=jArray.getJSONObject(i);

item.setCommentCount(jsonObject3.getString("commentCount"));

item.setId(jsonObject3.getString("id"));

item.setName(jsonObject3.getString("name"));

item.setOnline(jsonObject3.getString("online"));

item.setPicUrl(jsonObject3.getString("picUrl"));

item.setThreadCount(jsonObject3.getString("threadCount"));

list.add(item);

}

data.setList(list);

data.setAppApi(jsonObject2.getString("appApi"));

jd.setData(data);

returnjd;

}

publicstaticStringgetJSON(Stringpath){

URLurl;

Stringstr="";

try{

url=newURL(path);

HttpURLConnectionconnection=(HttpURLConnection)url.openConnection();

BufferedReaderbr=newBufferedReader(newInputStreamReader(connection.getInputStream()));

Stringtemp=null;

while((temp=br.readLine())!=null){

str+=temp;

temp=null;

}

}catch(Exceptione){

e.printStackTrace();

}

returnstr;

}

}

JSOND类定义的属性:

privateStringmessage;

privateDatasdatas;

Datas类定义的属性：

privateList<Item>list;

privateStringappApi;

Items类定义的属性：

privateStringname;

privateStringthreadCount;

privateStringcommentCount;

privateStringpicUrl;

privateStringonline;

privateStringid;

利用JSON类得到JSON字符串:1、使用JSONObject，对javabean和map生成

importjava.util.HashMap;

importjava.util.Map;

importorg.json.JSONObject;

publicclassCreateJson01{

publicstaticvoidmain(String[]args){

TrainInfoti=newTrainInfo("mixm","2012-10-01","forever","guess","never","closed");

JSONObjectjObject1=newJSONObject(ti);

System.out.println(jObject1);

Map<Integer,TrainInfo>maps=newHashMap<>();

maps.put(1,ti);

maps.put(2,ti);

maps.put(3,ti);

maps.put(4,ti);

JSONObjectjObject2=newJSONObject(maps);

System.out.println(jObject2);

}

}

2、使用JSONArray，对list集合生成

importjava.util.ArrayList;

importjava.util.List;

importorg.json.JSONArray;

importorg.json.JSONObject;

publicclassCreateJson02{

publicstaticvoidmain(String[]args){

TrainInfoti1=newTrainInfo("mixm1","2012-10-01","forever","guess","never","closed");

TrainInfoti2=newTrainInfo("mixm2","2013-10-01","forever","guess","never","closed");

TrainInfoti3=newTrainInfo("mixm3","2014-10-01","forever","guess","never","closed");

TrainInfoti4=newTrainInfo("mixm4","2015-10-01","forever","guess","never","closed");

JSONObjectjObject1=newJSONObject(ti1);

System.out.println(jObject1);

List<TrainInfo>list=newArrayList<>();

list.add(ti1);

list.add(ti2);

list.add(ti3);

list.add(ti4);

JSONArrayjObject2=newJSONArray(list);

System.out.println(jObject2);

}

}