StrutsResultSupport的利用详解编程语言

package commons.struts2;   
import <a href="http://lib.csdn.net/base/java" class='replace_word' title="Java 常识库" target='_blank' style='color:#df3434; font-weight:bold;'>Java</a>.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>  
 *   
 * 
  
 * <!-- START SNIPPET: example -->  
 * <result name="success" type="string">  
 *   <param name="stringName">stringName</param>  
 * </result>  
 * <!-- END SNIPPET: example -->  
 * 
 *
 */
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;
    }
} 

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;   
    }   
       
} 

<?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>