+=======================

注意看红色字体，对你有帮助，吓到我赶紧去吃个苹果压压惊，果然问题出处在此！！！！

================================

在ssh和ajax结合实现异步传输时，经常会出现的一个问题是，json格式的数据从后台传递到页面后无法解析，下面的data即是回调函数中参数，在页面断点后会看到data接收到的是下面一堆数据，其实是异常信息。

------------------------------------------------------------------------------------------

data
"StrutsProblemReport
Strutshasdetectedanunhandledexception:

tacktraces
org.apache.struts2.json.JSONException:org.apache.struts2.json.JSONException:org.apache.struts2.json.JSONException:org.apache.struts2.json.JSONException:org.apache.struts2.json.JSONException:java.lang.reflect.InvocationTargetException
org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:243)
org.apache.struts2.json.JSONWriter.process(JSONWriter.java:165)
org.apache.struts2.json.JSONWriter.value(JSONWriter.java:131)
org.apache.struts2.json.JSONWriter.write(JSONWriter.java:99)
org.apache.struts2.json.JSONUtil.serialize(JSONUtil.java:112)
org.apache.struts2.json.JSONResult.execute(JSONResult.java:198)com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:362)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:266)com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
org.apache.struts2.dispatcher.dispatcher.serviceAction(dispatcher.java:488)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
java.lang.Thread.run(UnkNownSource)
----------------------------------------------------------------------------------------

那么，为什么会出现这个异常呢？

究其原因，竟然是Hibernate的懒加载引起的。一定是你传递的数据中有引用类型的数据采用了懒加载机制。

比如：我要从Action中向前台传送一个Collection，通过get方法

publicCollectiongetMenuitemList(){
returnthis.menuitemList;
}

而其中Menuitem类型的数据结构是：

publicclassMenuitem{
privateLongmid;
privateLongpid;//父节点
privateStringname;//树的节点的名称
privateBooleanisParent;//是否为父节点
privateStringicon;//图标的路径
privateBooleanchecked;//复选框是否被选中

privateSetusers;

//getter(),setter()方法

}

在映射文件Menuitem.hbm.xml中users属性的配置如下：

未设置lazy="false"，则默认采用懒加载模式。

当中间表user_menuitem中没有数据时，ok，不会牵涉到use表，也就不存在懒加载问题，运行一切正常。

但是当user_menuitem表中有数据，且数据与所传送的Menuitem对象有关时，就会有问题了（那么你就GGGG 了）

因为懒加载，这样在Action中获取的Menuitem对象中的users属性中的set集合中会存在user对象的引用，但是user的信息其实并未加载，

只有当用到时，容器才再次发出sql请求进行加载，但是在json插件对menuitemList进行处理以转换成json格式时，HibernateSession早已关闭，这样user信息便加载不成功，而它又无法对set集合中空的引用进行处理，所以便抛出了JSONException。

有人可能会有疑问，我在web.xml中配置了OpenSessionInViewFilter过滤器，为什么Session还会关闭呢！？

这个疑问问的好！！我也不知何故，在网上也没找到相关的解释，不知是不是ajax的XMLHttpRequest的问题，

总之，在struts2与ajax结合的过程中，OpenSessionInView模式不起作用了！请知道的朋友不吝赐教！

好！既然知道了问题的原因，那么解决方法就很明了了！

方法一：设置lazy="false"，即对user不采用懒加载。如

lazy="false">

不过这时要注意在User对象中有没有其他对象的引用，用过有，也要设置为非懒加载模式。

方法二：忽略setusers属性，（推荐使用）

如果在前台页面不需要使用该属性的话，就不要把他传到前台去，设置方法是在其getter方法上加一注解：@JSON(serialize=false)

@JSON(serialize=false)
publicSetgetUsers(){
returnusers;
}

这样json插件在转换数据时就会忽略该属性。

现在问题应该已经解决了！！

下面关于struts2和ajax的结合还有几点建议：

1、在页面用不到的数据最好不要传到前台（这也是之所以推荐第二种方法的原因，传的数据越大，效率越低不是吗！）

2、不是向前台传数据的方法最好不要以get开头，json插件会把所有get开头的方法当做属性，转为json格式数据

3、如果方法必须以get开头，然而又不是为了转为json格式，那么可以在该方法上加注解：@JSON(serialize=false)

4、需要传到前台的数据，一定要在dao中加载完毕，不能使用懒加载模式。

来自http://blog.sina.com.cn/s/blog_7c28bad401013qbe.html（谢谢这位大哥跟豪哥下午给我的一些思路）

ajax请求json格式的数据，在经过interceptor时出现JSONException

出现题目描述的问题的原因和对应的解决方法如下：

（1）json中有Date类型的数据，在进行json解析的时候出现改类型不能被正确解析。应该把属性的类定义为java.util.Date;

（2）Action中定义的方法不是要返回前台定义的属性，可是方法的名称是getXxx,jsonplugins把这个方法当作属性用反射的方式调用了，这样就会出行JSONexception。这种情况的解决方法有两种，一种是把方法名不要定义为getXxx,也可以再方法名前加@JSON(serialize=false)。

android – 从url解析JSON,异常：解析数据时出错org.json.JSONException：字符115处的未终止数组

我正在解析这个url,我有一个例外,不知道如何跳过它……我只需要获得100个最受欢迎的应用程序的名称.有一个关键的“im：name”,里面有一个键“lebel”,但是我认为它是无效的JsonArray,所以我需要找到通过键“im：name”获取名字的方法…有smb任何想法我该如何解决这个问题？

这是我的AsyncTask.class

    public class AsyncTaskParseJson extends AsyncTask<String, String, String> {

    String jsonStringUrl = "https://itunes.apple.com/br/RSS/topfreeapplications/limit=100/json";
    JSONArray dataJsonArr = null;

    @Override
    protected void onPreExecute() {}

    @Override
    protected String doInBackground(String... arg0) {

        try {
            // instantiate our json parser
            JsonParser jParser = new JsonParser();
            // get json string from url
            JSONObject json = jParser.getJSONFromUrl(jsonStringUrl);
            // get the array of users
//HERE I NEED TO CHANGE SOMETHING
            dataJsonArr = json.getJSONArray("Feed"); // probably wrong
            // loop through all users
            for (int i = 0; i < dataJsonArr.length(); i++) {
                JSONObject c = dataJsonArr.getJSONObject(i);
                // Storing each json item in variable
                String name = c.getString("im:name");//probably wrong
            }
        } catch (JSONException e) {
            e.printstacktrace();
        }
        return null;
    }
}

这是日志

    09-10 20:04:03.013  18211-18241/com.yuretsrodik.top100apps E/JsonParser.java﹕ Error parsing data org.json.JSONException: Unterminated array at character 115 of {"Feed":{"author":{"name":{"label":"iTunes Store"}, "uri":{"label":"http://www.apple.com/br/itunes/"}}, "entry":[n{"im:name":{"label":"Messenger"}, "im:image":[n{"label":"http://a474.phobos.apple.com/us/r30/Purple4/v4/78/1f/f9/781ff9ea-bf94-5309-4c32-4b901279e54a/mzl.rairyzma.53x53-50.png", "attributes":{"height":"53"}}, n{"label":"http://a990.phobos.apple.com/us/r30/Purple4/v4/78/1f/f9/781ff9ea-bf94-5309-4c32-4b901279e54a/mzl.rairyzma.75x75-65.png", "attributes":{"height":"75"}}, n{"label":"http://a1675.phobos.apple.com/us/r30/Purple4/v4/78/1f/f9/781ff9ea-bf94-5309-4c32-4b901279e54a/mzl.rairyzma.100x100-75.png", "attributes":{"height":"100"}}], "summary":{"label":"lcance instantaneamente as pessoas na sua vida, gratuitamente. O Messenger é como mensagens de texto, mas você não precisa pagar por cada mensagem (funciona com o seu plano de dados). \n\nNão é só para amigos no Facebook: envie mensagens para as pessoas na sua agenda de contatos e basta inserir um número de telefone para adicionar um novo contato.\n\nBate-papos em grupo: crie grupos para as pessoas a quem você mais envia mensagens. Dê um nome a eles, defina fotos para o grupo e os mantenha em um só lugar.\n\nFotos e vídeos: grave vídeos e tire selfies ou outras fotos diretamente do aplicativo e envie-os com um toque.\n\nLigações gratuitas: fale por quanto tempo quiser, mesmo com pessoas em outros países. (Ligações são gratuitas somente através do Wi-Fi. Do contrário, cobranças de dados padrão são aplicáveis).\n\nMais formas de enviar mensagens: \nDê vida às suas conversas com as figurinhas. \nVeja uma prévia das suas fotos e vídeos no rolo da câmera sem sair da conversa, e escolha as melhores para enviar.\nGrave mensagens de voz quando tiver mais para dizer\n\nRecursos adicionais:\nSaiba quando as pessoas viram suas mensagens.\nEncaminhe mensagens ou fotos para as pessoas que não estavam na conversa.\nProcure pessoas e grupos para entrar em contato com eles rapidamente.\nAtive a localização para que as pessoas saibam que você está nas imediações.\nVeja quem está disponível no Messenger e quem está on-line no Facebook. \nDesative as notificações quando você estiver trabalhando, dormindo ou se precisar dar um tempo.\nFique conectado para nunca perder uma mensagem."}, "im:price":{"label":"Grátis", "attributes":{"amount":"0.00000", "currency":"USD"}}, "im:contentType":{"attributes":{"term":"Application", "label":"Aplicativo"}}, "rights":{"label":"© Facebook, Inc."}, "title":{"label":"Messenger - Facebook, Inc."}, "link":{"attributes":{"rel":"alternate", "type":"text/html", "href":"https://itunes.apple.com/br/app/messenger/id454638411?mt=8&uo=2"}}, "id":{"label":"https://itunes.apple.com/br/app/messenger/id454638411?mt=8&uo=2", "attributes":{"im:id":"454638411", "im:bundleId":"com.facebook.Messenger"}}, "im:artist":{"label":"Facebook, Inc.", "attributes":{"href":"https://itunes.apple.com/br/artist/facebook-inc./id284882218?mt=8&uo=2"}}, "category":{"attributes":{"im:id":"6005", "term":"Social Networking", "scheme":"https://itunes.apple.com/br/genre/ios-redes-sociais/id6005?mt=8&uo=2", "label":"Redes sociais"}}, "im:releaseDate":{"label":"2011-10-19T15:39:30-07:00", "attributes":{"label":"19/10/2011"}}}, n{"im:name":{"label":"WhatsApp Messenger"}, "im:image":[n{"label":"http://a1554.phobos.apple.com/us/r30/Purple1/v4/1f/94/ff/1f94ffd9-159e-a247-2c0f-059f86b6c6c9/mzl.ivmblqpq.53x53-50.png", "attributes":{"height":"53"}}, n{"label":"http://a422.phobos.apple.com/us/r30/Purple1/v4/1f/94/ff/1f94ffd9-159e-a247-2c0f-059f86b6c6c9/mzl.ivmblqpq.75x75-65.png", "attributes":{"height":"75"}}, n{"label":"http://a1251.phobos.apple.com/us/r30/Purple1/v4/1f/94/ff/1f94ffd9-159e-a247-2c0f-059f86b6c6c9/mzl.ivmblqpq.100x100-75.png", "attributes":{"height":"100"}}], "summary":{"label":"O WhatsApp Messenger é um mensageiro para smartphone
09-10 20:04:03.013  18211-18241/com.yuretsrodik.top100apps W/dalvikvm﹕ threadid=11: thread exiting with uncaught exception (group=0x42044e48)
09-10 20:04:03.023  18211-18241/com.yuretsrodik.top100apps E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
    Process: com.yuretsrodik.top100apps, PID: 18211
    java.lang.RuntimeException: An error occured while executing doInBackground()
            at android.os.AsyncTask$3.done(AsyncTask.java:300)
            at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
            at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
            at java.util.concurrent.FutureTask.run(FutureTask.java:242)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)
     Caused by: java.lang.NullPointerException
            at com.yuretsrodik.top100apps.AsyncTaskParseJson.doInBackground(AsyncTaskParseJson.java:32)
            at com.yuretsrodik.top100apps.AsyncTaskParseJson.doInBackground(AsyncTaskParseJson.java:10)
            at android.os.AsyncTask$2.call(AsyncTask.java:288)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)

将非常非常感谢帮助!!因为我真的堆叠(

解决方法:

首先,您进行调用将结果转换为名为json的字符串.
然后你必须将字符串转换为Json对象

          String json = null;  
        JSONObject jsonObj = null;  JSONObject FeedsObject = null;


     json = jParser.getJSONFromUrl(jsonStringUrl);
       if (json != null) {
    try {
         jsonObj = new JSONObject(json);

        FeedObject = jsonObj.getJSONObject("Feed");

为了更好地理解,请访问http://json.parser.online.fr/beta/并在那里粘贴您的json数据.
在右边你有一个设置按钮—>显示类型
您可以找到对象,字符串和数组

见下图.你试图获得一个不是数组的对象

com.alibaba.fastjson.JSONException: syntax error, pos 6, json : 这个 json 报错怎么整？？

com.alibaba.fastjson.JSONException: syntax error, pos 6, json : 

代码写了 ，但是报错了

    JSONObject querySql = JSON.parseArray(ccont).getJSONObject(0).getJSONObject("reader")
                    .getJSONObject("parameter").getJSONObject("querySql");;
            

要解析的 json 是  [{"reader":{"parameter":{"querySql":"SELECT * FROM  `t_rsd_model_history`t  WHERE  t.`status` = '' 正在执行 '' ;","readsource":""},"name":"mysqlreader"},"writer":{"parameter":{"writersource":"","column":["model_name"],"writeMode":"insert","batchSize":["22"],"table":["t_rsd_model_history"],"preSql":["SELECT * FROM  `t_rsd_model_history`t  WHERE  t.`status` = '' 正在执行 '' ;"]},"name":"mysqlwriter"}}]