Struts 2 - Interceptor重置响应JSON对象 [英] Struts 2 - Interceptor reset the response JSON Object

问题描述

我在我的网络应用程序中使用Struts 2。我编写代码来检查用户会话到拦截器但是当我返回 net.sf.json.JSONObject 作为响应时，它重置响应对象并将null设置为对象。
请检查我的代码。

I am using Struts 2 in my web application. I write code to check user session into interceptor but while I am returning net.sf.json.JSONObject as response, its reset the response object and set null to the object. Please check my code.

import net.sf.json.JSONObject;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class AuthorizationInterceptor implements Interceptor {

JSONObject response = new JSONObject();

public String intercept(ActionInvocation invocation) {
 try { 
      Map session = invocation.getInvocationContext().getSession();
        if (session.get("userId") == null) {
           response.put("errorCode", "SESSION_OUT");                
            return ActionSupport.ERROR;
        } else {
            System.out.println("Session found");
            Object action = invocation.getAction();
            return invocation.invoke();
        }
    } catch (Exception e) {
        return ActionSupport.ERROR;
    }
}

public JSONObject getResponse() {
    return response;
}

public void setResponse(JSONObject response) {
    this.response = response;
}

}

如何从拦截器获取JSON对象作为响应。
请帮我解决这个问题。

How can I get the JSON Object as response from interceptor. Please help me to resolve this issue.

推荐答案

有多个错误你的代码。

• 回应是 HttpServletResponse ，您不应该将该名称赋予JSONObject。


• 拦截器不是线程安全的，这意味着你应该在方法中定义JSONObject，以防止多个用户同时更新它，一个在另一个上面


• 你应该使用statusCode或errorCode 如JSON插件文档中所述，将其配置为您要返回的错误结果：

• Response is HttpServletResponse, you should not give that name to a JSONObject.
• Interceptors are NOT THREAD-SAFE, that means that you should define the JSONObject inside the method, to prevent multiple users to update it concurrently, one over the other
• You should use statusCode or errorCode as described in the JSON plugin documentation, by configuring it as the Error result you are returning:

使用statusCode设置响应的状态：

Use statusCode to set the status of the response:

<result name="error" type="json">
  <param name="statusCode">304</param>
</result>

并且errorCode发送错误（服务器可能最终发送一些东西到不是序列化JSON的客户端：

And errorCode to send an error(the server might end up sending something to the client which is not the serialized JSON):

 <result name="error" type="json">
  <param name="errorCode">404</param>
</result>

然后在AJAX回调函数的客户端读取它。

and then read it client-side in the AJAX callback function.

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