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struts2的框架解析第5篇action中result的各种转发类型

2017-12-05 01:16 519 查看
result配置类似于struts1中的forward，但struts2中提供了多种结果类型，常用的类型有：dispatcher（默认值，内部转发）、redirect（重定向到某个路径）、redirectAction（重定向到某个action）、plainText（输出页面的源代码）。

在result中可以用${属性名}表达式【ognl表达式】访问action中的属性，表达式中的属性名对应action中的属性，如下：

<result type = "redirect">/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">
<param name = "actionName">hello world</param>
<param name = "namespace">/test</param>
</result>


plaintText: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，就可以使用此类型。

<result name = "source" type = "plainText">
<param name = "localtion">/xxx.jsp</param>
<param name = "charSet">UTF-8</param><!--指定读取文件的编码-->
</result>


代码如下：

package com.gz.action;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

public class HelloWorldAction {

private String mes;
private String userName;

public String getMessage() {
return mes;
}

public String execute() throws UnsupportedEncodingException {
mes = "hello world!";
this.userName = URLEncoder.encode("你好，世界！","UTF-8");//进行编码
return "success";
}

public String addGlob() {
return "message";
}

public String getUserName() {
return userName;
}

public void setUserName(String userName) {
this.userName = userName;
}

}


adds.jsp的代码如下：

<%@page import="java.util.*,java.net.URLDecoder"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
${param.userName}
<%-- <%= URLDecoder.decode(new String(request.getParameter("userName").getBytes("ISO8859-1"),"UTF-8"),"UTF-8") %> --%>
</body>
</html>


struts.xml文件的代码版本一：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
"http://struts.apache.org/dtds/struts-2.5.dtd">

<!-- START SNIPPET: xworkSample -->
<struts>

<!-- http://localhost:8080/struts/test/helloworld -->
<package name="hello" extends="struts-default" namespace="/test">
<action name="helloworld" class="com.gz.action.HelloWorldAction" method="execute">
<!-- <result name = "success">/WEB-INF/test/hello.jsp</result> -->
<!-- 重定向到WEB-INF外面到jsp页面 -->
<result name = "success" type = "redirect">/adds.jsp?userName=${userName}</result>
</action>
<action name = "add">
<result>/WEB-INF/test/add.jsp</result>
</action>
<!--  http://localhost:8080/struts/test/redirect.action -->
<action name="redirect">
<result type="redirect">/adds.jsp</result>
</action>

<!-- 重定向到其他action -->
<!--  http://localhost:8080/struts/test/redirectAction.action -->
<action name="redirectAction">
<result type = "redirectAction">helloworld</result>
</action>

<!--  http://localhost:8080/struts/test/plainText.action -->
<action name="plainText">
<result type="plainText">
<param name="location">/adds.jsp</param>
<param name="charset">UTF-8</param><!-- 指定读取文件的编码 -->
</result>
</action>

<!-- 重定向到其他包到action -->
<!--  http://localhost:8080/struts/test/redirectOtherAtion.action -->
<action name="redirectOtherAtion">
<result type = "redirectAction">
<param name="actionName">xx</param>
<param name="namespace">/other</param>
</result>
</action>
</package>

<package name="other" namespace="/other" extends="struts-default">

<!-- 包内的全局视图 -->
<!--  http://localhost:8080/struts/other/mange.action -->
<global-results>
<result name = "message">/WEB-INF/test/message.jsp</result>
</global-results>
<action name="mange" class = "com.gz.action.HelloWorldAction" method="addGlob"></action>

<action name="xx">
<result>/WEB-INF/test/hello.jsp</result>
</action>
</package>

</struts>

<!-- END SNIPPET: xworkSample -->


struts.xml文件的代码版本二：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
"http://struts.apache.org/dtds/struts-2.5.dtd">

<!-- START SNIPPET: xworkSample -->
<struts>

<package name="base" extends="struts-default">
<global-results>
<result name = "message">/WEB-INF/test/message.jsp</result>
</global-results>
</package>

<!-- http://localhost:8080/struts/test/helloworld -->
<package name="hello" extends="base" namespace="/test">
<action name="helloworld" class="com.gz.action.HelloWorldAction" method="execute">
<!-- <result name = "success">/WEB-INF/test/hello.jsp</result> -->
<!-- 重定向到WEB-INF外面到jsp页面 -->
<result name = "success" type = "redirect">/adds.jsp?userName=${userName}</result>
</action>
<action name = "add">
<result>/WEB-INF/test/add.jsp</result>
</action>
<!--  http://localhost:8080/struts/test/redirect.action -->
<action name="redirect">
<result type="redirect">/adds.jsp</result>
</action>

<!-- 重定向到其他action -->
<!--  http://localhost:8080/struts/test/redirectAction.action -->
<action name="redirectAction">
<result type = "redirectAction">helloworld</result>
</action>

<!--  http://localhost:8080/struts/test/plainText.action -->
<action name="plainText">
<result type="plainText">
<param name="location">/adds.jsp</param>
<param name="charset">UTF-8</param><!-- 指定读取文件的编码 -->
</result>
</action>

<!-- 重定向到其他包到action -->
<!--  http://localhost:8080/struts/test/redirectOtherAtion.action -->
<action name="redirectOtherAtion">
<result type = "redirectAction">
<param name="actionName">xx</param>
<param name="namespace">/other</param>
</result>
</action>
</package>

<package name="other" namespace="/other" extends="base">

<!-- 内部转发到整个struts.xml的全局视图 -->
<!--  http://localhost:8080/struts/other/mange.action -->
<action name="mange" class = "com.gz.action.HelloWorldAction" method="addGlob"></action>

<action name="xx">
<result>/WEB-INF/test/hello.jsp</result>
</action>
</package>

</struts>

<!-- END SNIPPET: xworkSample -->
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