Struts2.2 Results Types

视图返回类型详细的信息可以查看 struts2-core-2.1.8.1.jar 包下的 struts-default.xml 里，这个我在拦截器那块已经贴出来了。下面我们就简单介绍各自的作用：

类型	描述	使用的类
chain	用来处理Action 链，被跳转的action 中仍能获取上个页面的值，如request 信息。	com.opensymphony.xwork2.ActionChainResult
dispatcher	用来转向页面，通常处理JSP	org.apache.struts2.dispatcher.ServletDispatcherResult
freemaker	处理FreeMarker 模板	org.apache.struts2.views.freemarker.FreemarkerResult
httpheader	控制特殊HTTP 行为的结果类型	org.apache.struts2.dispatcher.HttpHeaderResult
stream	向浏览器发送InputSream 对象，通常用来处理文件下载，还可用于返回AJAX 数据	org.apache.struts2.dispatcher.StreamResult
velocity	处理Velocity 模板	org.apache.struts2.dispatcher.VelocityResult
xslt	处理XML/XLST 模板	org.apache.struts2.views.xslt.XSLTResult
plainText	显示原始文件内容，例如文件源代码	org.apache.struts2.dispatcher.PlainTextResult
redirect	重定向到一个URL ，被跳转的页面中丢失传递的信息，如request	org.apache.struts2.dispatcher.ServletRedirectResult
redirectAction	重定向到一个Action ，跳转的页面中丢失传递的信息，如request	org.apache.struts2.dispatcher.ServletActionRedirectResult

1 、 Chain:

<package name="public" extends="struts-default">
    <!-- Chain creatAccount to login, using the default parameter -->
    <action name="createAccount" class="...">
        <result type="chain">login</result>
    </action>

    <action name="login" class="...">
        <!-- Chain to another namespace -->
        <result type="chain">
            <param name="actionName">dashboard</param>
            <param name="namespace">/secure</param>
        </result>
    </action>
</package>

<package name="secure" extends="struts-default" namespace="/secure">
    <action name="dashboard" class="...">
        <result>dashboard.jsp</result>
    </action>
</package>

2 、 Dispatcher ：

<result name="success" type="dispatcher">
  <param name="location">foo.jsp</param>
</result>

3 、 FreeMarker ：

<result name="success" type="freemarker">foo.ftl</result>

4 、 HttpHeader ：

<result name="success" type="httpheader">
  <param name="status">204</param>
  <param name="headers.a">a custom header value</param>
  <param name="headers.b">another custom header value</param>
</result>

<result name="proxyRequired" type="httpheader">
  <param name="error">305</param>
  <param name="errorMessage">this action must be accessed through a prozy</param>
</result>

5 、 Redirect ：

<result name="success" type="redirect">
  <param name="location">foo.jsp</param>
  <param name="parse">false</param>
  <param name="anchor">FRAGMENT</param>
</result>

<package name="passingRequestParameters" extends="struts-default" namespace="/passingRequestParameters">
   <-- Pass parameters (reportType, width and height) -->
   <!--
   The redirect-action url generated will be :
   /genReport/generateReport.jsp?reportType=pie&width=100&height=100
   -->
   <action name="gatherReportInfo" class="...">
      <result name="showReportResult" type="redirect">
         <param name="location">generateReport.jsp</param>
         <param name="namespace">/genReport</param>
         <param name="reportType">pie</param>
         <param name="width">100</param>
         <param name="height">100</param>
      </result>
   </action>
</package>

6 、 Redirect Action ：

<package name="public" extends="struts-default">
    <action name="login" class="...">
        <!-- Redirect to another namespace -->
        <result type="redirectAction">
            <param name="actionName">dashboard</param>
            <param name="namespace">/secure</param>
        </result>
    </action>
</package>

<package name="secure" extends="struts-default" namespace="/secure">
    <-- Redirect to an action in the same namespace -->
    <action name="dashboard" class="...">
        <result>dashboard.jsp</result>
        <result name="error" type="redirectAction">error</result>
    </action>

    <action name="error" class="...">
        <result>error.jsp</result>
    </action>
</package>

<package name="passingRequestParameters" extends="struts-default" namespace="/passingRequestParameters">
   <-- Pass parameters (reportType, width and height) -->
   <!--
   The redirectAction url generated will be :
   /genReport/generateReport.action?reportType=pie&width=100&height=100
   -->
   <action name="gatherReportInfo" class="...">
      <result name="showReportResult" type="redirectAction">
         <param name="actionName">generateReport</param>
         <param name="namespace">/genReport</param>
         <param name="reportType">pie</param>
         <param name="width">100</param>
         <param name="height">100</param>
         <param name="empty"></param>
         <param name="supressEmptyParameters">true</param>
      </result>
   </action>
</package>

7 、 Stream ：

<result name="success" type="stream">
  <param name="contentType">image/jpeg</param>
  <param name="inputName">imageStream</param>
  <param name="contentDisposition">attachment;filename="document.pdf"</param>
  <param name="bufferSize">1024</param>
</result>

8 、 Velocity ：

<result name="success" type="velocity">
  <param name="location">foo.vm</param>
</result>

9 、 XSL ：

<result name="success" type="xslt">
  <param name="location">foo.xslt</param>
  <param name="matchingPattern">^/result/[^/*]$</param>
  <param name="excludingPattern">.*(hugeCollection).*</param>
</result>

10 、 PlainText ：

<action name="displayJspRawContent" >
  <result type="plaintext">/myJspFile.jsp</result>
</action>


<action name="displayJspRawContent" >
  <result type="plaintext">
     <param name="location">/myJspFile.jsp</param>
     <param name="charSet">UTF-8</param>
  </result>
</action>

11 、 Tiles ：

<%@ taglib uri="http://tiles.apache.org/tags-tiles" prefix="tiles" %>
<%@ taglib prefix="s" uri="/struts-tags" %>

<%-- Show usage; Used in Header --%>
<tiles:importAttribute name="title" scope="request"/>
<html>
    <head><title><tiles:getAsString name="title"/></title></head>
<body>
    <tiles:insertAttribute name="header"/>

    <p id="body">
        <tiles:insertAttribute name="body"/>
    </p>

	<p>Notice that this is a layout made in JSP</p>
</body>
</html>

Struts2.2 Results Types

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