Struts2_Action中result的各种转发类型

清疚 2022-06-16 13:37 241阅读 0赞

Action中result的各种转发类型：

<action name="helloworld" class="cn.itcast.action.HelloWorldAction"
    		method="execute">
    		<result name="success">/WEB-INF/page/hello.jsp</result>
    	</action>
    	
    	result配置类似于struts2中的forward,但struts2中提供了多种结果类型,常用的类型有：dispatche(默认值)
    	、redirect、redirectAction、plainText。
    	
    	在result中还可以使用${属性名}表达式访问action中的属性,表达式里的属性名对应action中的属性。如下：
    	<result type="redired">/view.jsp?id=${id}</result>
    	
    	下面是redirectAction结果类型的例子,如果重定向的action中同一个包下：
    	<result type="redirectAction">helloworld</result>
    	如果重定向的action在别的命名空间下：
    	<result type="redirectAction">
    		<param name="actionName">helloworld</param>
    		<param name="namespace">/test</param>
    	</result>
    	plaintext:显示原始文件内容,例如:当我们需要原样显示jsp文件源代码的时候,我们可以使用此类型。
    	
    	<action name="plainText">
    		<result type="plainText">
    			<param name="location">/index.jsp</param>
    			<param name="charSet">UTF-8</param>
    		</result>
    	</action>

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE struts PUBLIC
    	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    	"http://struts.apache.org/dtds/struts-2.3.dtd">
    <struts>
    	<package name="bese" extends="struts-default">
    		
    		<global-results>
    			<result name="message">/WEB-INF/page/msessage.jsp</result>
    		</global-results>
    	</package>
    
    	<package name="itcast" namespace="/test" extends="bese">
    
    		<action name="list" class="cn.itcast.action.HelloWorldAction"
    			method="execute">
    			<result name="success" type="redirect">/employeeAdd.jsp?username=${username}
    			</result>
    		</action>
    
    		<action name="message" class="cn.itcast.action.HelloWorldAction"
    			method="add">
    		</action>
    
    		<action name="addUI">
    			<result>/WEB-INF/page/employeeAdd.jsp</result>
    		</action>
    
    		
    		<action name="redirect">
    			<result type="redirect">/employeeAdd.jsp</result>
    		</action>
    
    		
    		
    		<action name="redirectAction">
    			
    			<result type="redirectAction">
    				<param name="actionName">xxx</param>
    				<param name="namespace">/department</param>
    			</result>
    		</action>
    
    		
    		<action name="plainText">
    			<result type="plainText">
    				<param name="location">/index.jsp</param>
    				<param name="charSet">UTF-8</param>
    			</result>
    		</action>
    	</package>
    
    	<package name="other" namespace="/department" extends="bese">
    		<action name="message" class="cn.itcast.action.HelloWorldAction"
    			method="add">
    		</action>
    
    		<action name="xxx">
    			<result>/WEB-INF/page/hello.jsp</result>
    		</action>
    	</package>
    </struts>

HelloWorldAction.java

package cn.itcast.action;
    
    import java.net.URLEncoder;
    
    public class HelloWorldAction {
    	private String msg;
    	private String username;
    
    	public String getUsername() {
    		return username;
    	}
    
    	public void setUsername(String username) {
    		this.username = username;
    	}
    
    	public String getMessage() {
    		return msg;
    	}
    
    	public String execute() throws Exception {
    		this.username = URLEncoder.encode("中国人民万岁", "utf-8");
    		msg = "我的第一个struts2应用";
    		return "success";
    	}
    
    	public String add() {
    		return "message";
    	}
    }

jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
    
    <title>My JSP 'msessage.jsp' starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    
    
    </head>
    
    <body>
    	结果
    	<br/>
    </body>
    </html>

<%@ page language="java" import="java.util.*,java.net.URLDecoder"
    	pageEncoding="utf-8"%>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
    <title>My JSP 'employeeAdd.jsp' starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    </head>
    
    <body>
    	<%=URLDecoder.decode(new String(request.getParameter("username").getBytes("ISO8859-1"),"utf-8"), "utf-8")%>
    	<form action="/xxx">
    		姓名:<input type="text" name="xxxx" />
    	</form>
    </body>
    </html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
    <title>My JSP 'employeeAdd.jsp' starting page</title>
    
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    </head>
    
    <body>
    	<form action="/xxx">
    		姓名:<input type="text" name="xxxx" />
    	</form>
    </body>
    </html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>
        <base href="<%=basePath%>">
        
        <title>My JSP 'index.jsp' starting page</title>
    	<meta http-equiv="pragma" content="no-cache">
    	<meta http-equiv="cache-control" content="no-cache">
    	<meta http-equiv="expires" content="0">    
    	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    	<meta http-equiv="description" content="This is my page">
    	
      </head>
      
      <body>
        	<%=new Date() %>中国
      </body>
    </html>