我正在一个项目中工作，从URL中检索JSON后，我需要操作JSON文件。我从以下链接检索了我的JSON文件：
http://api.openeventdatabase.org/event/b2e7df60-3f25-4d80-b7ac-cffc10dd5313
该JSON文件包含有关法国特定服务站的信息，例如：
为此，我尝试按照其他用户在stackoverflow上给出的解决方案来解决类似的问题。你可以看到：
Android JSON parsing of multiple JSONObjects inside JSONObject
这是我的代码（完整方法）：
@GET
@Path("/DecouvrirJSONInfo/{stationServiceInfo}")
public StationService DecouvrirJSON(@PathParam ("stationServiceInfo") String jsonString) throws JSONException
{
JSONObject myResponse = new JSONObject(jsonString);
String nom;
String carburantGazole, carburantSP95, carburantSP98, carburantGPL;
float prixCarburantGazole, prixCarburantSP95, prixSP98, prixGPL;
Date dtActGazole, dtActSP98, dtActSP95,dtActGPL;
StationService actuelStationService = new StationService();
Carburant carburant = new Carburant();
List<Carburant> carburants = new ArrayList<Carburant>();
try
{
//nom = myResponse.getString("nom");
Iterator<String> keysRoot = myResponse.keys();
while (keysRoot.hasNext())
{
String rootKey = keysRoot.next();
if(rootKey == "properties")
{
JSONObject innerZeroJObject = myResponse.getJSONObject(rootKey);
Iterator<String> keys = innerZeroJObject.keys();
while( keys.hasNext() )
{
String key = keys.next();
//Log.v("**********", "**********");
//Log.v("category key", key);
if(key=="carburant")
{
JSONObject innerJObject = myResponse.getJSONObject(key);
Iterator<String> innerKeys = innerJObject.keys();
while( innerKeys.hasNext() )
{
String innerKkey = keys.next();
if(innerKkey == "1") // gazole
{
JSONObject innerIIJObject = myResponse.getJSONObject(innerKkey);
Iterator<String> innerIKeys = innerIIJObject.keys();
while( innerIKeys.hasNext() )
{
carburantGazole = innerIIJObject.getString("carburant");
dtActGazole = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSSSSS")
.parse(innerIIJObject.getString("maj"));
prixCarburantGazole = Float.parseFloat( innerIIJObject.getString("prix"));
carburant.DefinirNomCarburant(carburantGazole);
carburant.DefinirPrixCarburant(prixCarburantGazole);
carburants.add(carburant);
carburant = new Carburant();
}
}
else if(innerKkey == "2") // Sp95
{
JSONObject innerIIJObject = myResponse.getJSONObject(innerKkey);
Iterator<String> innerIKeys = innerIIJObject.keys();
while( innerIKeys.hasNext() )
{
carburantSP95 = innerIIJObject.getString("carburant");
dtActSP95 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSSSSS")
.parse(innerIIJObject.getString("maj"));
prixCarburantSP95 = Float.parseFloat( innerIIJObject.getString("prix"));
carburant.DefinirNomCarburant(carburantSP95);
carburant.DefinirPrixCarburant(prixCarburantSP95);
carburants.add(carburant);
carburant = new Carburant();
}
}
else if(innerKkey == "3") // SP98
{
JSONObject innerIIJObject = myResponse.getJSONObject(innerKkey);
Iterator<String> innerIKeys = innerIIJObject.keys();
while( innerIKeys.hasNext() )
{
carburantSP98 = innerIIJObject.getString("carburant");
dtActSP98 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSSSSS")
.parse(innerIIJObject.getString("maj"));
prixSP98 = Float.parseFloat( innerIIJObject.getString("prix"));
carburant.DefinirNomCarburant(carburantSP98);
carburant.DefinirPrixCarburant(prixSP98);
carburants.add(carburant);
carburant = new Carburant();
}
}
//String value = innerJObject.getString(innerKkey);
//Log.v("key = "+key, "value = "+value);
}
}
}
}
}
//actuelStationService.DefinirNomStationService(nom);
actuelStationService.DefinirCarburants(carburants);
}
catch(Exception ex)
{
}
return actuelStationService;
}
你能帮助我并找到错误吗？请参阅第一个包含JSON响应的链接。
答案 0 :(得分：0)
我建议使用像JsonPath这样的库来搜索json而不是手动迭代。如果您可以在项目中使用JsonPath，可以使用以下方法：
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;
import com.jayway.jsonpath.Configuration;
import com.jayway.jsonpath.JsonPath;
public class SearchJson {
public static void main(String[] args) throws Exception {
URL url = new URL("http://api.openeventdatabase.org/event/b2e7df60-3f25-4d80-b7ac-cffc10dd5313");
URLConnection connection = url.openConnection();
String jsonString = toString(new InputStreamReader(connection.getInputStream()));
Object document = Configuration.defaultConfiguration().jsonProvider().parse(jsonString);
Integer nbDesCarburants = (Integer) JsonPath.read(document, "$.properties.carburants.length()");
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
List<Carburant> carburants = new ArrayList<>();
for (int i = 0; i < nbDesCarburants; i++) {
Map<String, Object> carburantMap = (Map<String, Object>) JsonPath.read(document,
"$.properties.carburants[" + i + "]");
String nom = (String) carburantMap.get("carburant");
Date maj = simpleDateFormat.parse(carburantMap.get("maj").toString());
float prix = Float.parseFloat(carburantMap.get("prix").toString());
Carburant carburant = new Carburant(nom, maj, prix);
carburants.add(carburant);
}
for (Carburant carburant : carburants) {
System.out.println(carburant);
}
}
static class Carburant {
private final String nom;
private final Date date;
private final float prix;
public Carburant(String nom, Date date, float prix) {
super();
this.nom = nom;
this.date = date;
this.prix = prix;
}
@Override
public String toString() {
return "Carburant [nom=" + nom + ", date=" + date + ", prix=" + prix + "]";
}
}
public static String toString(InputStreamReader reader) throws IOException {
char[] charBuf = new char[1024];
int read = reader.read(charBuf, 0, 1024);
StringBuilder sb = new StringBuilder();
while (read != -1) {
sb.append(new String(charBuf));
charBuf = new char[1024];
read = reader.read(charBuf, 0, 1024);
}
sb.append(new String(charBuf));
return sb.toString();
}
}
要运行该示例，请确保您的类路径中有JsonPath jar，或者如果您使用maven构建项目，请在依赖项中添加json-path。
<dependency>
<groupId>com.jayway.jsonpath</groupId>
<artifactId>json-path</artifactId>
<version>2.3.0</version>
</dependency>