一、result配置:
result - name 就是前面返回的值,success,error等。
type:
dispatcher. 默认是这个,底层是jsp的forward;
redirect:重定向;
chain:比如在aAction里面请求的东西,返回的时候到另一个Action里面继续执行,并且数据可以共享;相当于内部转发到了一个新的Action
redirectAction:重定向到一个Action;例子中从hello action中的数据,重定向到hello2,这里面的数据是带不过去的(name的值带不过去);
freemarker:一种模板技术;
velocity:也是一种模板;
1.result中的type类型:
com.cy.action.HelloAction.java:
package com.cy.action; import com.opensymphony.xwork2.ActionSupport; public class HelloAction extends ActionSupport{ /** * */ private static final long serialVersionUID = 1L; private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String execute() throws Exception { return SUCCESS; } //redirect public String r() throws Exception { return "r"; } //chain public String c() throws Exception { return "c"; } //redirectAction public String ra() throws Exception { return "ra"; } }
com.cy.action.HelloAction2.java:
package com.cy.action; import com.opensymphony.xwork2.ActionSupport; public class HelloAction2 extends ActionSupport{ /** * */ private static final long serialVersionUID = 1L; private String name2; public String getName2() { return name2; } public void setName2(String name2) { this.name2 = name2; } @Override public String execute() throws Exception { this.name2 = "你好啊"; return SUCCESS; } }
struts.xml:
<?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> <constant name="struts.enable.DynamicMethodInvocation" value="true" /> <package name="manage" namespace="/" extends="struts-default"> <action name="hello" class="com.cy.action.HelloAction"> <result name="success" type="dispatcher">success.jsp</result> <result name="r" type="redirect">success.jsp</result> <result name="c" type="chain">hello2</result> <result name="ra" type="redirectAction">hello2</result> </action> <action name="hello2" class="com.cy.action.HelloAction2"> <result name="success" type="dispatcher">success.jsp</result> </action> </package> </struts>
index.jsp:
<body> <a href="hello?name=struts2" target="_blank">默认转发_dispatcher</a><br> <a href="hello!r?name=struts2" target="_blank">重定向_redirect</a><br> <a href="hello!c?name=struts2" target="_blank">链条_chain</a><br> <a href="hello!ra?name=struts2" target="_blank">重定向到Action_redirectAction</a><br> </body>
success.jsp:
<body> name: ${name}<br> name2:${name2 } </body>
测试结果:
1)默认转发-dispatcher:
name的值取到了;url中地址不变;
2)重定向-redirect:
name的值取不到;不是同一个request了,所以数据没法共享;
url地址栏变了;
3)链条-chain:
name的数据能取,内部转发到了一个新的Action,这个数据可以共享;
name2的数据能取,是hello2Action自己设进去的,肯定能取;
url地址:不变;
4)重定向到action - redirectAction:
name的值取不到:从一个action中重定向到另一个action继续执行,这里面数据带不过去,不是一个request;客户端重新请求hello2.action:那么:
name2的值是hello2Action自己设进去的,肯定能取;
url:已经变成了hello2.action;说明客户端重新请求了hello2.action;
2.result全局配置:
比如result为error,几乎是所有的action都要共用到的;这时我们就可以把它配置为全局的;
执行过程:
首先在hello的action配置中找result name为error的;
如果没有找到,就去global-result中找;
如果hello action中已经有了,就不会到其他地方去找了;
下面是例子:
HelloAction.java:
package com.cy.action; import com.opensymphony.xwork2.ActionSupport; public class HelloAction extends ActionSupport{ /** * */ private static final long serialVersionUID = 1L; private String name; private String error; public String getError() { return error; } public void setError(String error) { this.error = error; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String execute() throws Exception { if(name==null || name.length()==0){ error = "name是空的"; return ERROR; } return SUCCESS; } //redirect public String r() throws Exception { return "r"; } //chain public String c() throws Exception { return "c"; } //redirectAction public String ra() throws Exception { return "ra"; } }
struts.xml配置:
<struts> <constant name="struts.enable.DynamicMethodInvocation" value="true" /> <package name="manage" namespace="/" extends="struts-default"> <global-results> <result name="error">error.jsp</result> </global-results> <action name="hello" class="com.cy.action.HelloAction"> <result name="success" type="dispatcher">success.jsp</result> <result name="r" type="redirect">success.jsp</result> <result name="c" type="chain">hello2</result> <result name="ra" type="redirectAction">hello2</result> </action> <action name="hello2" class="com.cy.action.HelloAction2"> <result name="success" type="dispatcher">success.jsp</result> </action> </package> </struts>
error.jsp:
<body> 错误信息:${error } </body>
index.jsp:
<body> <a href="hello" target="_blank">全局result配置</a><br> </body>
测试:
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