扩展struts2的结果集StrutsResultSupport

最新推荐文章于 2020-03-22 18:07:24 发布

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#struts #扩展 #string #action #class #exception

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本文介绍了一个自定义的Struts2结果类型StringResultType，用于直接输出字符串内容。通过配置struts.xml文件，该类型可以将Action中的字符串变量直接响应到客户端。

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代码如下：

package commons.struts2; import java.io.PrintWriter; import javax.servlet.http.HttpServletResponse; import org.apache.struts2.dispatcher.StrutsResultSupport; import com.opensymphony.xwork2.ActionInvocation; /** * result type for output string in action * * @author songwei,yaolei <b>Example:</b> * * <pre> *  * <result name="success" type="string"> * <param name="stringName">stringName</param> * </result> *  * </pre> * */ public class StringResultType extends StrutsResultSupport { private static final long serialVersionUID = 1L; private String contentTypeName; private String stringName = ""; public StringResultType() { super(); } public StringResultType(String location) { super(location); } protected void doExecute(String finalLocation, ActionInvocation invocation) throws Exception { HttpServletResponse response = (HttpServletResponse) invocation .getInvocationContext().get(HTTP_RESPONSE); // String contentType = (String) // invocation.getStack().findValue(conditionalParse(contentTypeName, // invocation)); String contentType = conditionalParse(contentTypeName, invocation); if (contentType == null) { contentType = "text/plain; charset=UTF-8"; } response.setContentType(contentType); PrintWriter out = response.getWriter(); // String result = conditionalParse(stringName, invocation); String result = (String) invocation.getStack().findValue(stringName); out.println(result); out.flush(); out.close(); } public String getContentTypeName() { return contentTypeName; } public void setContentTypeName(String contentTypeName) { this.contentTypeName = contentTypeName; } public String getStringName() { return stringName; } public void setStringName(String stringName) { this.stringName = stringName; } }

使用的方法：

package test; import com.opensymphony.xwork2.ActionSupport; public class MyAction extends ActionSupport{ String result="abc"; public String ajax() { return "ajaxResponse"; } // getter && setter public String getResult() { return result; } public void setResult(String result) { this.result = result; } }

定义struts.xml :

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="test" extends="struts-default"> <result-types> <result-type name="string" class="test.StringResultType"></result-type> </result-types> <action name="myAction" class="test.MyAction" > <result name="ajaxResponse" type="string"> <param name="stringName">result</param> </result> </action> </package> </struts>

无非也就是将string结果集进行申明，然后给返回“ajaxResponse”的结果绑定变量名。这里定义返回Action的String result变量，即“abc”。