在我的应用程序中,如果设置了另一个SelectOneMenu,我正在尝试设置/更新SelectOneMenu.我们正在使用primefaces,所以我检查了primefaces展示,找到了我正在寻找的东西.不幸的是它不起作用.事件没有解雇,我不知道为什么.希望你能帮助我

Link to the Example of the primefaces showcase

– >如果设置了语言,它应该自动重新加载带有称呼的列表,但事实并非如此.我必须按F5重新加载.有任何想法吗？

我的xHTML代码

<h:form id="addressBasicsForm">
  <p:growl id="growl" sticky="true" showDetail="true"/>
  <p:tabView id="tabView">
    <p:tab id="stammdaten" title="#{msg.adr_basics_tabtitle}">
  <table>
        <tr>
          <td>
    <p:panel toggleable="false">
      <table>
        <tr>
          <td>
            <p:selectOneMenu id="somLang" value="#AddressBasics_m.languageId}">
              <f:selectItems value="#{AddressBasics_m.languageItems}"/>
                      <p:ajax update="somAnrede" listener="#{AdressBasics_m.handleLanguageChange}"/>
            </p:selectOneMenu>
          </td>
        </tr>
        <tr>
          <td>
            <p:selectOneMenu id="somAnrede" value="#AddressBasics_m.salutationId}">
              <f:selectItems value="#{AddressBasics_m.salutationItems}" />
            </p:selectOneMenu>
          </td>

我的豆

@Named("AddressBasics_m")
@ConversationScoped
public class AddressBasicsView implements Serializable{
private static final long serialVersionUID = -4034697810438325785L;

public List<SelectItem> getSalutationItems(){
    if(firstrun)
        languageId = 21L;

    firstrun = false;
    if(salutationItems == null || lastLanguageId != languageId){
        salutationItems = addressService.getAllSalutationsByLangId(languageId);
        setLastLanguageId(languageId);
    }
    return salutationItems;
}

public void handleLanguageChange(){
    this.salutationItems = getSalutationItems();
}

我相信问题出在您的Ajax调用上.
Ajax可能非常棘手,我会推荐两种不同的方法：

<p:ajax render="@form" listener="#{AdressBasics_m.handleLanguageChange}"/>

要么

<p:ajax update=":addressBasicsForm:tabView:stammdaten:somAnrede" listener="#{AdressBasics_m.handleLanguageChange}"/>

在这里,我想使用API​​密钥显示 JSON内容.但我无法获得身份验证.

我在JsonObject中收到错误：

org.json.JSONException: Value Authorization of type java.lang.String cannot be converted to JSONObject

在我的Android应用程序中,我只是传递API密钥和URL id以获取以下URL中的JSON响应.我使用JSON数组显示JSON内容.

但如果我：

public class AndroidAPiActivity extends Activity {

/*
 * FlickrQuery = FlickrQuery_url
 * + FlickrQuery_per_page
 * + FlickrQuery_nojsoncallback
 * + FlickrQuery_format
 * + FlickrQuery_tag + q
 * + FlickrQuery_key + FlickrApiKey
 */

String FlickrQuery_url = "http://192.138.11.9/api/interests/";
String FlickrQuery_per_page = "&per_page=1";
String FlickrQuery_nojsoncallback = "&nojsoncallback=1";
String FlickrQuery_format = "&format=json";
String FlickrQuery_tag = "&tags=";
String FlickrQuery_key = "&api_key=";

// Apply your Flickr API:
// www.flickr.com/services/apps/create/apply/?
   String FlickrApiKey = "f65215602df8f8af";

   EditText searchText;
   Button searchButton;
   TextView textQueryResult,textJsonResult;
   ImageView imageFlickrPhoto;
   Bitmap bmFlickr;

   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);

       searchText = (EditText)findViewById(R.id.searchtext);
       searchButton = (Button)findViewById(R.id.searchbutton);
       textQueryResult = (TextView)findViewById(R.id.queryresult);
       textJsonResult = (TextView)findViewById(R.id.jsonresult);
       imageFlickrPhoto = (ImageView)findViewById(R.id.flickrPhoto);
       searchButton.setonClickListener(searchButtonOnClickListener);
   }

   private Button.OnClickListener searchButtonOnClickListener
   = new Button.OnClickListener(){

 public void onClick(View arg0) {
  // Todo Auto-generated method stub
  String searchQ = searchText.getText().toString();
  String searchResult = QueryFlickr(searchQ);
  textQueryResult.setText(searchResult);
  String jsonResult = ParseJSON(searchResult);
  textJsonResult.setText(jsonResult);

  if (bmFlickr != null){
   imageFlickrPhoto.setimageBitmap(bmFlickr);
  }
 }};

   private String QueryFlickr(String q){

    String qResult = null;

    String qString =
      FlickrQuery_url
      + FlickrQuery_per_page
      + FlickrQuery_nojsoncallback
      + FlickrQuery_format
      + FlickrQuery_tag + q 
      + FlickrQuery_key + FlickrApiKey;

    HttpClient httpClient = new DefaultHttpClient();
       HttpGet httpGet = new HttpGet(qString);

       try {
  httpentity httpentity = httpClient.execute(httpGet).getEntity();

  if (httpentity != null){
   InputStream inputStream = httpentity.getContent();
   Reader in = new InputStreamReader(inputStream);
   BufferedReader bufferedreader = new BufferedReader(in);
   StringBuilder stringBuilder = new StringBuilder();

   String stringReadLine = null;

   while ((stringReadLine = bufferedreader.readLine()) != null) {
    stringBuilder.append(stringReadLine + "\n");
    }

   qResult = stringBuilder.toString();

  }

 } catch (ClientProtocolException e) {
  // Todo Auto-generated catch block
  e.printstacktrace();
 } catch (IOException e) {  
  // Todo Auto-generated catch block
  e.printstacktrace();
 }

       return qResult;
   }

   private String ParseJSON(String json){

    String jResult = null;
    bmFlickr = null;
    String key_id;
    String category;
    String subcategory;
    String title;
    String icon_image;

    try
     {
  JSONObject JsonObject = new JSONObject(json);
  JSONObject Json_photos = JsonObject.getJSONObject("interests");
  JSONArray JsonArray_photo = Json_photos.getJSONArray("interest");

  //We have only one photo in this exercise
  JSONObject FlickrPhoto = JsonArray_photo.getJSONObject(0);

  key_id = FlickrPhoto.getString("row_key");
  category = FlickrPhoto.getString("category");
  subcategory = FlickrPhoto.getString("subcategory");
   title = FlickrPhoto.getString("title");

  jResult = "\n key_id: " + key_id + "\n"
    + "category: " + category + "\n"
    + "subcategory: " + subcategory + "\n"
    + "title: " + title + "\n";

  bmFlickr = LoadPhotoFromFlickr(key_id,category,subcategory,title);

 } catch (JSONException e) {
  // Todo Auto-generated catch block
  e.printstacktrace();
 }

    return jResult;
   }

   private Bitmap LoadPhotoFromFlickr(
     String key_id,String category,String subcategory,String title){
    Bitmap bm= null;

    String icon_image = null;
 //   String FlickrPhotoPath ="";
   String FlickrPhotoPath ="http://182.72.180.34/media/"+icon_image+".jpg";

    URL FlickrPhotoUrl = null;

    try {

  FlickrPhotoUrl = new URL(FlickrPhotoPath);

  HttpURLConnection httpconnection = (HttpURLConnection) FlickrPhotoUrl.openConnection();
  httpconnection.setDoInput(true);
  httpconnection.connect();
  InputStream inputStream = httpconnection.getInputStream();
  bm = BitmapFactory.decodeStream(inputStream);

 } catch (MalformedURLException e) {
  // Todo Auto-generated catch block
  e.printstacktrace();
 } catch (IOException e) {
  // Todo Auto-generated catch block
  e.printstacktrace();
 }

    return bm;
   }
}

更新：

基于HTML响应,我可以告诉你这不是JSON.该响应告诉我您的Web服务的URL不正确.

您需要检查您的网址.

额外信息/上一个答案：

看起来简单的答案是正确的 – 您的结果不是有效的JSON字符串.有关JSON应该是什么样的详细信息,请参见JSON.org网站.

查看JSON Parser Online – 我发现它在使用JSON时非常有用.

很奇怪你正在请求JSON,它没有正确地返回它 – 也许我错过了一些东西.