Struts2 学习笔记 11 Result part2
之前学习了result type 和global result 我们现在来说一下
1.Dynamic Result动态结果集。先来看一下小项目的目录
首页的两个链接访问user/user?type=1 和user/user?type=2。来看一下struts.xml的配置
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>
<constant name="struts.devMode" value="true" />
<package name="default" namespace="/user" extends="struts-default">
<action name="user" class="com.tfj.struts2.action.UserAction">
<result>${r}
</result>
</action>
</package>
</struts>
这里的<result>${r}</result>就是一个动态结果集，那么是怎么调用的呢。在UserAction.java里定义了r字符串变量，实现get（） set（） 方法并给r复制来实现动态调用。
UserAction.java
package com.tfj.struts2.action;
import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport{
private String r;
public String getR() {
return r;
}
public void setR(String r) {
this.r = r;
}
private int type;
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
@Override
public String execute() throws Exception {
if(type==1) r="/success.jsp";
else if(type==2) r="/error.jsp";
return "success";
}
}
定义的r也成为action的一个属性，我们可以用debug查看到。
2.然后我们说一下带参数的结果集，先看一下小项目构成。
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> <constant name="struts.devMode" value="true" /> <package name="default" namespace="/user" extends="struts-default"> <action name="user" class="com.tfj.struts2.action.UserAction"> <result type="redirect"> /success.jsp?t=${type} </result> </action> </package> </struts>
result类型是redirect，传递的来type=1，我们要在success.jsp里接受type的值。我们看一下结果如下
success.jsp
<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'success.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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
Success. <br>
from valuestack: <s:property value="t"/><br>
from actioncontext: <s:property value="#parameters.t"/>
<s:debug></s:debug>
</body>
</html>
下图为关系图
资源下载：DynamicResult.rar
ResultWithParams.rar