Struts2_20_ResultWithParameter

来源：互联网发布：几米软件编辑：程序博客网时间：2024/06/12 21:53

1,一次请求，不管经过多少个Action，都只有一个值栈。所以如果客户端向Aaction发出请求，struts.xml执行服务器端跳转，Aaction跳转到Baction，那么Aaction和Baction是共享一个值栈的，所以这两个Action定义的属性可以互相使用，不用传参数。

2，但是如果客户端向Aaction发出请求，struts.xml执行客户端跳转即redirect时，就是两次请求了，那么就需要传递参数了。

小例子：

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">

<constant name="struts.devMode" value="true" />

<constant name="struts.i18n.encoding" value="GBK"></constant>

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

<action name="user" class="com.awei.struts2.action.UserAction">

<result type="redirect">/user_success.jsp?t=${type}</result>

</action>

</package>

</struts>

com.awei.struts2.action.UserAction：

package com.awei.struts2.action;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport{

private String type;

public String getType() {

return type;

}

public void setType(String type) {

this.type = type;

}

public String execute(){

return SUCCESS;

}

index.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>

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>

<title>My JSP 'index.jsp' starting page</title>

<!--

-->

</head>

<body>

<<a href="user/user?type=3">进入</a><br>

</body>

</html>

重点：user_success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>

<%@ taglib uri="/struts-tags" prefix="s" %>

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>

<title>My JSP 'user_success.jsp' starting page</title>

<!--

-->

</head>

<body>

from ValueStack:<s:property value="t"/>

from ActionContext:<s:property value="#parameters.t"/>

<s:debug></s:debug>

</body>

</html>

显示结果：

from ValueStack: from ActionContext:3

[Debug]

Struts ValueStack Debug

Value Stack Contents

ObjectProperty NameProperty Valuecom.opensymphony.xwork2.DefaultTextProvidertextsnull

Stack Context

These items are available using the #key notationKeyValuecom.opensymphony.xwork2.dispatcher.HttpServletRequestorg.apache.struts2.dispatcher.StrutsRequestWrapper@6c137capplication{org.apache.tomcat.InstanceManager=org.apache.catalina.core.DefaultInstanceManager@16b352c, org.apache.catalina.resources=org.apache.naming.resources.ProxyDirContext@1ad0d89, org.apache.catalina.jsp_classpath=/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/classes/;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/commons-fileupload-1.2.1.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/commons-io-1.3.2.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/commons-logging-1.0.4.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/freemarker-2.3.15.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/jsf-api.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/jsf-impl.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/jstl-1.2.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/ognl-2.7.3.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/struts2-core-2.1.8.1.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/xwork-core-2.1.6.jar;/F:/java/apache-tomcat-7.0.28/lib/;/F:/java/apache-tomcat-7.0.28/lib/activation.jar;/F:/java/apache-tomcat-7.0.28/lib/annotations-api.jar;/F:/java/apache-tomcat-7.0.28/lib/catalina-ant.jar;/F:/java/apache-tomcat-7.0.28/lib/catalina-ha.jar;/F:/java/apache-tomcat-7.0.28/lib/catalina-tribes.jar;/F:/java/apache-tomcat-7.0.28/lib/catalina.jar;/F:/java/apache-tomcat-7.0.28/lib/dom4j-1.6.1.jar;/F:/java/apache-tomcat-7.0.28/lib/ecj-3.7.2.jar;/F:/java/apache-tomcat-7.0.28/lib/el-api.jar;/F:/java/apache-tomcat-7.0.28/lib/jasper-el.jar;/F:/java/apache-tomcat-7.0.28/lib/jasper.jar;/F:/java/apache-tomcat-7.0.28/lib/jsmartcom_zh_CN.jar;/F:/java/apache-tomcat-7.0.28/lib/jsp-api.jar;/F:/java/apache-tomcat-7.0.28/lib/mail.jar;/F:/java/apache-tomcat-7.0.28/lib/servlet-api.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-api.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-coyote.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-dbcp.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-i18n-es.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-i18n-fr.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-i18n-ja.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-jdbc.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-util.jar;/F:/java/apache-tomcat-7.0.28/lib/xunzai.com_mysql-connector-java-5.1.7-bin.jar;/F:/java/apache-tomcat-7.0.28/bin/tomcat-juli.jar;/F:/java/apache-tomcat-7.0.28/bin/bootstrap.jar;/F:/各种软件/jdk/开发环境/lib/tools.jar;/F:/java/jarPackage/commons-lang-2.4.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/commons-fileupload-1.2.2.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/commons-io-2.2-javadoc.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/commons-io-2.2-sources.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/commons-io-2.2-test-sources.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/commons-io-2.2-tests.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/commons-io-2.2.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/dnsns.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/localedata.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/servlet-api.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/sunjce_provider.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/sunmscapi.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/sunpkcs11.jar, com.sun.faces.config.WebConfiguration=com.sun.faces.config.WebConfiguration@4276fd, org.apache.jasper.compiler.TldLocationsCache=org.apache.jasper.compiler.TldLocationsCache@cef147, org.apache.jasper.runtime.JspApplicationContextImpl=org.apache.jasper.runtime.JspApplicationContextImpl@15a4a77, org.apache.tomcat.JarScanner=org.apache.tomcat.util.scan.StandardJarScanner@53bbfa, freemarker.Configuration=freemarker.template.Configuration@16feee5, javax.servlet.context.tempdir=F:\java\apache-tomcat-7.0.28\work\Catalina\localhost\Struts2_0700_ResultWithParameter}com.opensymphony.xwork2.ActionContext.localezh_CNcom.opensymphony.xwork2.dispatcher.HttpServletResponseorg.apache.catalina.connector.ResponseFacade@13d4c49current.property.pathnullcom.opensymphony.xwork2.ActionContext.application{org.apache.tomcat.InstanceManager=org.apache.catalina.core.DefaultInstanceManager@16b352c, org.apache.catalina.resources=org.apache.naming.resources.ProxyDirContext@1ad0d89, org.apache.catalina.jsp_classpath=/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/classes/;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/commons-fileupload-1.2.1.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/commons-io-1.3.2.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/commons-logging-1.0.4.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/freemarker-2.3.15.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/jsf-api.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/jsf-impl.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/jstl-1.2.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/ognl-2.7.3.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/struts2-core-2.1.8.1.jar;/F:/java/apache-tomcat-7.0.28/webapps/Struts2_0700_ResultWithParameter/WEB-INF/lib/xwork-core-2.1.6.jar;/F:/java/apache-tomcat-7.0.28/lib/;/F:/java/apache-tomcat-7.0.28/lib/activation.jar;/F:/java/apache-tomcat-7.0.28/lib/annotations-api.jar;/F:/java/apache-tomcat-7.0.28/lib/catalina-ant.jar;/F:/java/apache-tomcat-7.0.28/lib/catalina-ha.jar;/F:/java/apache-tomcat-7.0.28/lib/catalina-tribes.jar;/F:/java/apache-tomcat-7.0.28/lib/catalina.jar;/F:/java/apache-tomcat-7.0.28/lib/dom4j-1.6.1.jar;/F:/java/apache-tomcat-7.0.28/lib/ecj-3.7.2.jar;/F:/java/apache-tomcat-7.0.28/lib/el-api.jar;/F:/java/apache-tomcat-7.0.28/lib/jasper-el.jar;/F:/java/apache-tomcat-7.0.28/lib/jasper.jar;/F:/java/apache-tomcat-7.0.28/lib/jsmartcom_zh_CN.jar;/F:/java/apache-tomcat-7.0.28/lib/jsp-api.jar;/F:/java/apache-tomcat-7.0.28/lib/mail.jar;/F:/java/apache-tomcat-7.0.28/lib/servlet-api.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-api.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-coyote.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-dbcp.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-i18n-es.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-i18n-fr.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-i18n-ja.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-jdbc.jar;/F:/java/apache-tomcat-7.0.28/lib/tomcat-util.jar;/F:/java/apache-tomcat-7.0.28/lib/xunzai.com_mysql-connector-java-5.1.7-bin.jar;/F:/java/apache-tomcat-7.0.28/bin/tomcat-juli.jar;/F:/java/apache-tomcat-7.0.28/bin/bootstrap.jar;/F:/各种软件/jdk/开发环境/lib/tools.jar;/F:/java/jarPackage/commons-lang-2.4.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/commons-fileupload-1.2.2.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/commons-io-2.2-javadoc.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/commons-io-2.2-sources.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/commons-io-2.2-test-sources.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/commons-io-2.2-tests.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/commons-io-2.2.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/dnsns.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/localedata.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/servlet-api.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/sunjce_provider.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/sunmscapi.jar;/F:/各种软件/jdk/开发环境/jre/lib/ext/sunpkcs11.jar, com.sun.faces.config.WebConfiguration=com.sun.faces.config.WebConfiguration@4276fd, org.apache.jasper.compiler.TldLocationsCache=org.apache.jasper.compiler.TldLocationsCache@cef147, org.apache.jasper.runtime.JspApplicationContextImpl=org.apache.jasper.runtime.JspApplicationContextImpl@15a4a77, org.apache.tomcat.JarScanner=org.apache.tomcat.util.scan.StandardJarScanner@53bbfa, freemarker.Configuration=freemarker.template.Configuration@16feee5, javax.servlet.context.tempdir=F:\java\apache-tomcat-7.0.28\work\Catalina\localhost\Struts2_0700_ResultWithParameter}last.property.accessednull__component_stack[org.apache.struts2.components.Debug@18df055]attrorg.apache.struts2.util.AttributeMap@19d96b1com.opensymphony.xwork2.dispatcher.ServletContextorg.apache.catalina.core.ApplicationContextFacade@1767553com.opensymphony.xwork2.ActionContext.containercom.opensymphony.xwork2.inject.ContainerImpl@369fdccom.opensymphony.xwork2.ActionContext.session{}com.opensymphony.xwork2.dispatcher.PageContextorg.apache.jasper.runtime.PageContextImpl@1961a84session{}com.opensymphony.xwork2.util.ValueStack.ValueStackcom.opensymphony.xwork2.ognl.OgnlValueStack@15a3a92__requestWrapper.getAttributefalselast.bean.accessednullrequest{.freemarker.RequestParameters=freemarker.ext.servlet.HttpRequestParametersHashModel@1a550f9, struts.valueStack=com.opensymphony.xwork2.ognl.OgnlValueStack@15a3a92, __cleanup_recursion_counter=1, .freemarker.Request=freemarker.ext.servlet.HttpRequestHashModel@bb5859}parameters{t=[Ljava.lang.String;@6745b9}com.opensymphony.xwork2.ActionContext.parameters{t=[Ljava.lang.String;@6745b9}__link[Ljava.lang.Object;@128340

来源： <My JSP 'user_success.jsp' starting page>

从上图中可以看出来，<s:property value="t"/>是无效的，而且从valuestack中可以看出根本没有t和type的属性。但是可以从stack context中看到有parameters，可以用These items are available using the #key notation 来取得：即<s:property value="#parameters.t"/>

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