调用一个Struts 2的动作用ajax，直接写一个字符串的响应不会返回字符串 [英] Call a Struts 2 action using ajax, which write a string directly to the response does not return the string

问题描述

在一个struts2的应用程序，我呼吁在一个Ajax请求，并直接写一个字符串到响应如下，并返回空在动作的执行方法。

In a struts2 application I am calling a Ajax request in and write a string directly to the response as below and return null in the execute method of the action.

ServeletActionContext.getResponse().getOutputStream().print("sample string");
return null;

在的struts.xml 我有以下声明，（以下为应用程序如何声明与工作正常结果类型的动作。在我的情况，因为我不吨需要结果调用JSP或其他操作，我没加的结果标签）

In struts.xml I have the below declaration, (below is how the application declares the actions with result types which are working fine. In my case since I don't need result to invoke a JSP or another action, I did not add the result tag)

<action name="controller" class="controller">

和我映射了部分类的应用程序的context.xml

<bean id="controller" class="com.test.ControllerAction" scope="prototype">

然后，我有如下的Ajax调用，

Then I have the ajax call as below,

$.ajax({url:"/root/me/controller.action",success:function(result){
    alert(result);
}});

但问题是在上面，而不是提醒我写了响应样本字符串，它会提醒整个JSP页面，上面Ajax调用所在。我缺少的是在这里吗？

But the problem is in above instead of alerting the "sample string" which I wrote for the response, it alerts the whole JSP page where the above Ajax call resides. What am I missing here?

推荐答案

返回的结果类型流默认情况下，它输出的文本。

Return result type stream by default it outputs text.

<action name="controller" class="ControllerAction">
  <result type="stream">
    <param name="contentType">text/html</param>
    <param name="inputName">stream</param>
  </result>
</action

流应的属性类型 ImputStream ;

public class ControllerAction extends ActionSupport {

  private InputStream stream;

  //getter here
  public InputStream getStream() {
    return stream;
  }

  public String execute() throws Exception {
    String str = "sample string";
    stream = new ByteArrayInputStream(str.getBytes());
    return SUCCESS;
  }
}    

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