12.Struts2重定向Action

最新推荐文章于 2018-11-10 13:13:21 发布

NewJerseySautan

最新推荐文章于 2018-11-10 13:13:21 发布

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文章标签： struts action encoding ajax redirect 浏览器

在这章中,你将熟悉一下Struts2重定向Action并学习如何在Struts2程序中使用它.

Post之后的重定向 : 该post模式由Struts2提供.这web程序中是常见的模式.由一个action转发到另一个action.这是常见的用法转发action显示页面.

转发Action结果 : 重定向模式由Struts2提供.ActionMapperFactory提供的ActionMapper用来转发浏览器到URL指定的Action.在下面的Struts2程序中你能看到一个简单的实现.

重定向动态参数 : Action重定向结果带有下面的参数

actionName
namespace
method
encode
parse
location
prependServletContext

仿照下面的步骤创建一个重定向Action例子 :

第一步 : 创建struts.xml文件

<?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="false" />
 <constant name="struts.devMode" value="true" />
<include file="struts-default.xml"/>
 <package name="roseindia" namespace="/roseindia" extends="struts-default">

 

 <action name="showAjaxLoginCancelForm">
 <result>/pages/ajaxloginCancel.jsp</result>
 </action>

 <action name="ajaxloginCancel" class="net.roseindia.Login">
 <result name="input">/pages/ajaxloginCancel.jsp</result>
 <result name="error">/pages/ajaxloginCancel.jsp</result>
 <result name="cancel" type="redirect">/pages/ajaxloginCancel.jsp</result>
 <result>/pages/ajaxloginsuccess.jsp</result>
 </action>

 
 </package>

 

</struts>

第二步 : 创建一个输入表单 : ajaxloginCancel.jsp

<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
 <head>
 <s:head theme="ajax" debug="true"/>
 </head>
 <body>
 <s:div id="loginDiv" theme="ajax">
 <div style="width: 300px;border-style: solid">
 <s:form action="ajaxloginCancel" validate="true">
 <tr>
 <td colspan="2">
 Login
 </td>
 </tr>
 <tr>
 <td colspan="2">
 <s:actionerror />
 <s:fielderror />
 </td>
 <s:textfield name="username" label="Login name"/>
 <s:password name="password" label="Password"/>
 <s:submit value="Submit" theme="ajax" targets="loginDiv" notifyTopics="/ajaxloginCancel"/>
 <s:submit action="showAjaxLoginCancelForm" value="Cancel" οnclick="form.οnsubmit=null"/>

 </s:form>
 </div>
 </s:div>
 </body>
</html>

第三步 : 创建一个Action类：Login.java

package net.roseindia;
import com.opensymphony.xwork2.ActionSupport;
import java.util.Date;

/**
* Validate a user login. 
*/
public class Login extends ActionSupport {

 public String execute() throws Exception {
 if(!getUsername().equals("Admin") || !getPassword().equals("Admin")){
 addActionError("Invalid user name or password! Please try again!");
 return ERROR;
 }
 if(getUsername().equals("Admin") || getPassword().equals("Admin")){
 return SUCCESS;
 }else{
 return NONE;
 }
 }

 // ---- Username property ----

 /**
 * Field to store User username.
 * 
 */
 private String username = null;

 /**
 * Provide User username.
 *
 * @return Returns the User username.
 */
 public String getUsername() {
 return username;
 }

 /**
 * Store new User username
 *
 * @param value The username to set.
 */
 public void setUsername(String value) {
 username = value;
 }

 // ---- Username property ----

 /**
 * Field to store User password.
 * 
 */
 private String password = null;

 /**
 * Provide User password.
 *
 * @return Returns the User password.
 */
 public String getPassword() {
 return password;
 }

 /**
 * Store new User password
 *
 * @param value The password to set.
 */
 public void setPassword(String value) {
 password = value;
 }

}

创建一个适当的校验器 :

validation.xml的格式要么是<Action名>-validation.xml或者<Aaction名>-<Action别名>-validation.xml.

Login-validation.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE validators PUBLIC
 "-//OpenSymphony Group//XWork Validator 1.0.2//EN"
 "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">

<validators>
 <field name="username">
 <field-validator type="requiredstring">
 <param name="trim">true</param>
 <message>Login name is required</message>
 </field-validator>
 </field>
 <field name="password">
 <field-validator type="requiredstring">
 <param name="trim">true</param>
 <message>Password is required</message>
 </field-validator>
 </field>
</validators>

当输入正确的用户名和密码,用户会得到ajaxloginsuccess.jsp页面显示的输入信息

<html>
 <head>
 <title>Login Success</title>
 </head>
 <body>
 Login Successful !
 <h1> Welcome to <%=request.getParameter("username")%> </h1>
 </body>
</html>