An example of java parsing json data:
json data demo1 :
{"errCode":"0","data":{"validDrawNumToday":0}}
json data demo2:
{"errCode":"0","data":{"validDrawNumToday":0,"drawQrcodeUrl":"http://h5.itv.cp21.ott.cibntv.net/lottery/draw/acceptqrcode.html?devId =test_x","prize":{"id":2,"name":"Doraemon Constellation","picTv":"http://i1.img.cp21.ott.cibntv.net/lc04_iscms/ 201607/28/10/39/f8aebd254c4c4a51903f56ea5a6dd4ec.png","picMobile":"http://i3.img.cp21.ott.cibntv.net/lc06_iscms/201607/29/11/22/c100737ff9af47ba86bebbc07e8216d3.png"}} } The access url of java parses the json content and saves the value of the specified field "prize" field
package tvguess;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.Iterator;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
public class changedevid {
public static String getWebContent(String Url) {
HttpGet httpGet = new HttpGet(Url);
CloseableHttpClient httpClient = HttpClients.createDefault();
CloseableHttpResponse httpResponse = null;
try {
httpResponse = httpClient.execute(httpGet);
} catch (IOException e) {
e.printStackTrace();
}
HttpEntity entity = httpResponse.getEntity();
if (entity != null)
try {
return EntityUtils.toString(entity, "UTF-8");
} catch (ParseException | IOException e) {
e.printStackTrace();
}
return null;
}
/**
* json中可以不带字prize字段
* @param strResult
* @return
*/
public static String parseJsonMulti(String strResult) {
System.out.println("parse start....");
String prize = "";
try {
JSONObject jobject = new JSONObject(strResult);
JSONObject jdata = jobject.getJSONObject("data");
System.out.println(jdata);
//循环查找出json属性值
Iterator<?> objkey=jdata.keys();
while (objkey.hasNext()){
String aa2 = (String) objkey.next().toString();
String bb2 = jdata.getString(aa2);
System.out.println(aa2+":"+bb2);
if(aa2.equals("prize")){
System.out.println("------------");
String prizeresult = bb2;
System.out.println("prizerresult:"+ prizeresult);
fileprize("prize.txt", prizeresult);
}else{
System.out.println("no prize");
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return prize;
}
/**
* json中必须带prize的字段
* @param strResult
* @return
*/
public static String parseJsonMulti01(String strResult) {
System.out.println("parse start....");
String prize = "";
try {
// 直接查找元素子元素
JSONObject jobject = new JSONObject(strResult);
JSONObject jdata = jobject.getJSONObject("data");
JSONObject jprize = jdata.getJSONObject("prize");
prize = jprize.getString("id") + "," + jprize.getString("name") + "/n";
System.out.println(prize);
} catch (JSONException e) {
e.printStackTrace();
}
return prize;
}
public static void fileprize(String fileName, String content) {
RandomAccessFile randomFile = null;
try {
randomFile = new RandomAccessFile(fileName, "rw");
long fileLength = randomFile.length();
randomFile.seek(fileLength);
randomFile.writeBytes(content);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (randomFile != null) {
try {
randomFile.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
public static void main(String[] args) throws IOException {
int x = (int) (Math.random() * 100000);
//String strUrl = "http://h5.itv.cp21.ott.cibntv.net/api/lottery/draw.json?devId=test_" + x;
String strUrl = "http://10.58.100.90/jsondatedemo.txt";
System.out.println(strUrl);
String strResult = getWebContent(strUrl);
System.out.println(strResult);
String prize = parseJsonMulti(strResult);
//String prize = parseJsonMulti01(strResult);
//fileprize("prize.txt", prize);
}
}
--------------------------------------------------------------------------------------
json lookup code for array
public String parseJsonMulti(String strResult) {
// public void parseJsonMulti(String strResult,TextView etContent) {
System.out.println("parse start....");
String channelid = "";
//List livelist = new ArrayList();
try {
//JSONArray jsonArray = new JSONArray(String.valueOf(msg.obj));
JSONObject jsonObject = new JSONObject(strResult.toString());
JSONArray arrayJson = jsonObject .getJSONArray("data");
// etContent.setText("parse start...");
String str = "urlconnect:";
for (int i=0;i<arrayJson.length();i++)
{
JSONObject tempJson = arrayJson.optJSONObject(i);
//JSONObject jsonObject2 = (JSONObject)jsonArray.opt(i);
str=str+"第"+i+"个,频道id:"+tempJson.getString("channelId")+"\n";
// etContent.setText(str);
// str2 = str2+"type:"+tempJson.getString("type")+"频道id:"+tempJson.getString("channelId")+"\n";
// str2 = str2+tempJson.getString("type")+tempJson.getString("channelId");
channelid=channelid+tempJson.getString("channelId")+",";
// livelist.add(i);
// etContent.setText(str2);
System.out.println(channelid);
// Log.v("zms", str);
}
System.out.print(str);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
// etContent.setText("error");
}
return channelid;
}