我想将json数据转换为字符串
import java.io.BufferedReader;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import org.json.JSONArray;
import org.json.JSONObject;
public static void main(String[] args) throws Exception
{
URL url = new URL("http://192.168.1.13/test/ProductWb.php?productId=9");
HttpURLConnection conn ;
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setReadTimeout(60);
conn.setRequestProperty("Accept", "application/json");
String json="";
json = readUrl(conn);
System.out.println(json);
JSONObject jsonObject=new JSONObject(json);
JSONArray jarray=jsonObject.getJSONArray("modeles");
JSONObject modele= jarray.getJSONObject("modele");
for (int i=0;i<modele.length();i++) {
System.out.println(modele(i).getString("id_product"));
System.out.println(modele(i).getString("meta_title"));
System.out.println("*********");
}
}
它告诉我json数据,但给我这个错误:
{"modeles":[{"modele":{"id_product":"9","id_shop":"1","id_lang":"4","description":null,"description_short":"<pre>Peugeot 208<\/pre>","info_prix":"","info_1":null,"info_2":null,"info_3":null,"info_4":null,"info_5":null,"link_rewrite":"208","meta_description":"Peugeot 208","meta_keywords":"peugeot 208","meta_title":"Peugeot 208","name":"208","available_now":"","available_later":""}}]}
Exception in thread "main" java.lang.IllegalStateException: This is not a JSON Array.
at com.google.gson.JsonElement.getAsJsonArray(JsonElement.java:106)
at com.autoreduc.services.TestProduct.main(TestProduct.java:59)
如果您有任何解决方案,请帮助我。提前致谢
在您的代码中,您从URL读取json数据。我刚刚复制了您的数据并将其粘贴到一个文件中,并在您的网址已关闭时读取该文件。我一步一步地展示了如何解析你的json对象和内容。为此,我使用了java-json-schema.jar
。
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Iterator;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;
public class Tets {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
JSONParser parser = new JSONParser();
try{
/* URL url = new URL("http://192.168.1.13/test/ProductWb.php?productId=9");
HttpURLConnection conn ;
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setReadTimeout(60);
conn.setRequestProperty("Accept", "application/json");*/
String json="";
Object obj = parser.parse(new FileReader("C:\\XXX\\XX\\src\\javapackage\\t.json"));
JSONObject jsonObject = (JSONObject) obj;
System.out.println(jsonObject.toJSONString()); //modeles object
JSONArray name = (JSONArray) jsonObject.get("modeles");
System.out.println(name.toJSONString());//array inside modeles array
for (Object o : name)
{
JSONObject person = (JSONObject) o;
JSONObject person1 = (JSONObject)person.get("modele");
System.out.println(person.get("modele"));//modele object
System.out.println(person1.get("id_lang"));//modele attribute
}
}catch(Exception e){e.printStackTrace();}
}
}
产量
你的Json对象
{"modeles":[{"modele":{"id_lang":"4","info_5":null,"info_4":null,"link_rewrite":"208","meta_keywords":"peugeot 208","info_3":null,"info_2":null,"info_1":null,"available_now":"","meta_description":"Peugeot 208","id_product":"9","description_short":"<pre>Peugeot 208<\/pre>","description":null,"name":"208","info_prix":"","meta_title":"Peugeot 208","available_later":"","id_shop":"1"}}]}
您的Json数组包含在json对象中
[{"modele":{"id_lang":"4","info_5":null,"info_4":null,"link_rewrite":"208","meta_keywords":"peugeot 208","info_3":null,"info_2":null,"info_1":null,"available_now":"","meta_description":"Peugeot 208","id_product":"9","description_short":"<pre>Peugeot 208<\/pre>","description":null,"name":"208","info_prix":"","meta_title":"Peugeot 208","available_later":"","id_shop":"1"}}]
你的Json对象在数组中
{"id_lang":"4","info_5":null,"info_4":null,"link_rewrite":"208","meta_keywords":"peugeot 208","info_3":null,"info_2":null,"info_1":null,"available_now":"","meta_description":"Peugeot 208","id_product":"9","description_short":"<pre>Peugeot 208<\/pre>","description":null,"name":"208","info_prix":"","meta_title":"Peugeot 208","available_later":"","id_shop":"1"}
您的Json对象添加了lang属性值= 4
4
您的JSON不是数组。
它是一个带有一个属性的JSON对象:modeles
,其值为数组。
将根解析为JsonObject
。
{
->表示JSONObject,[
->表示JSONArray,首先获取jsonObject然后获取其中的数组。
我尝试用jsonObject
包导入jar
JSONObject jsonObject=new JSONObject(yourstring);
JSONArray jarray=jsonObject.getJSONArray("modeles");
JSONObject modele= jarray.getJSONObject("modele");
for (int i=0;i<modele.length();i++) {
System.out.println(modele(i).getString("id_product"));
System.out.println(modele(i).getString("meta_title"));
System.out.println("*********");
}