我的代码有问题。我想从编码JSON数组的PHP脚本中获取值;
我的PHP代码:<?php
$roro = array();
$roro[] = array(
'id' => '1',
'title' => 'title1'
);
$roro[] = array(
'id' => '2',
'title' => 'title2'
);
$out = array_values($roro);
echo json_encode($out);
?>
这是我的Java代码解码JSON:
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost("http://www.liliandgizmo.legtux.org/lilyCreation/getCategorie.php");
// post.setEntity(new UrlEncodedFormEntity(validateMessage(m)));
HttpResponse response = client.execute(post);
StatusLine status = response.getStatusLine();
if (status.getStatusCode() == 200) {
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
final Gson gson = new GsonBuilder().create();
try {
Reader read = new InputStreamReader(is);
mList = gson.fromJson(read, new TypeToken<List<Categorie>>() {
}.getType());
is.close();
} catch (Exception e) {
e.printStackTrace();
}
}
my category class:
public class Categorie {
/**
* Identifiant en DB.
*/
private int id;
/**
* Nom de la catégorie.
*/
private String title;
// + getter & setter
}
我的问题:
com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was STRING at line 1 column 1
at com.google.gson.Gson.fromJson(Gson.java:815)
at com.google.gson.Gson.fromJson(Gson.java:768)
at fr.gizmoichitzo.loisirsaurelie.upload.shared.LoisirGetCategory.test(LoisirGetCategory.java:50)
at fr.gizmoichitzo.loisirsaurelie.upload.client.Main.main(Main.java:22)
Caused by: java.lang.IllegalStateException: Expected BEGIN_ARRAY but was STRING at line 1 column 1
at com.google.gson.stream.JsonReader.beginArray(JsonReader.java:338)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:79)
at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60)
at com.google.gson.Gson.fromJson(Gson.java:803)
... 3 more
如果我理解我的问题，我认为JSON必须解码应该看起来像:
'[{...},{...}]'
但是…为什么没有'就不像[{...},{...}] ??
如果我在浏览器上播放脚本，我得到[{"id":"1","title":"title1"},{"id":"2","title":"title2"}]
我真的不懂PHP，但是用Java你可以添加一些"调试"到你的代码，像这样:
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost("http://www.liliandgizmo.legtux.org/lilyCreation/getCategorie.php");
// post.setEntity(new UrlEncodedFormEntity(validateMessage(m)));
HttpResponse response = client.execute(post);
StatusLine status = response.getStatusLine();
if (status.getStatusCode() == 200) {
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
final Gson gson = new GsonBuilder().create();
try {
Reader read = new InputStreamReader(is);
BufferedReader in = new BufferedReader(read); //added
String inputLine; //added
while ((inputLine = in.readLine()) != null) //added
System.out.println(inputLine); //added
in.close(); //added
//List<Categorie> mList = gson.fromJson(read, new TypeToken<List<Categorie>>() {
}.getType());
is.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
，你会看到脚本返回的字符串是:
[{"id":"1","title":"title1"},{"id":"2","title":"title2"}]
当然，这是一个无效的JSON，所以Gson会抛出异常。