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Struts2的一个入门实例----登录功能

时间：2016-12-04 19:25:06      阅读：279      评论：0      收藏：0      [点我收藏+]

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一、搭建环境与测试

     1、web.xml文件，配置核心Filter

  1: <?xml version="1.0" encoding="UTF-8"?>

  2: <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

  3:      xmlns="http://java.sun.com/xml/ns/j2ee" 

  4:      xmlns:web="http://xmlns.jcp.org/xml/ns/javaee" 

  5:      xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" 

  6:      id="WebApp_9" version="2.4">

  7:   <filter>

  8:     <filter-name>struts2</filter-name>

  9:     <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

 10:   </filter>

 11:   <filter-mapping>

 12:     <filter-name>struts2</filter-name>

 13:     <url-pattern>/*</url-pattern>

 14:   </filter-mapping>

 15:   <filter>

 16:     <filter-name>struts-cleanup</filter-name>

 17:     <filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>

 18:   </filter>

 19:   <filter-mapping>

 20:     <filter-name>struts-cleanup</filter-name>

 21:     <url-pattern>/*</url-pattern>

 22:   </filter-mapping>

 23: </web-app>

     2、将框架的类库放在WEB-INF/lib路径下

         技术分享

     3、用户请求页面

  1: <%@ page language="java" contentType="text/html; charset=UTF-8"

  2:     pageEncoding="UTF-8"%>

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

  4: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  5: <html>

  6:     <head>

  7:         <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

  8:         <title>login</title>

  9:     </head>

 10:     <body>

 11:         <s:form action="login" align="center">

 12:           <s:textfield name="username" key="user" value="用户名"/>

 13:           <s:textfield name="password" key="pass" value="密    码"/>

 14:           <s:submit value="登录" key="login"/>

 15:         </s:form>

 16:     </body>

 17: </html>

     4、实现控制器类

         Action就是一个包含execute方法的普通java类。代码如下

         LoginAction.java

  1: package cc.openhome;

  2: 

  3: import com.opensymphony.xwork2.Action;

  4: import com.opensymphony.xwork2.ActionContext;

  6: 

  7: public class LoginAction implements Action {
  8:   private String username;

  9:   private String password;

 10:   public String getUsername() {

 11:     return username;

 12:   }

 13:   public void setUsername(String username) {

 14:     this.username = username;

 15:   }

 16:   public String getPassword() {

 17:     return password;

 18:   }

 19:   public void setPassword(String password) {

 20:     this.password = password;

 21:   }

 22:   

 23:   public String execute() throws Exception {

 24:     // TODO Auto-generated method stub

 25:     ActionContext ctx=ActionContext.getContext();  

 26:     if(getUsername().equals("nihao") && getPassword().equals("nihao")){

 27:       ctx.getSession().put("user", getUsername());

 28:       return SUCCESS;

 29:     }else{

 30:       return ERROR;

 31:     }

 32:   }

 33: }

 34:

    5、配置Action

        修改struts.xml如下：struts.xml

  1: <?xml version="1.0" encoding="UTF-8" ?>

  2: <!DOCTYPE struts PUBLIC

  3:   "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

  4:   "http://struts.apache.org/dtds/struts-2.3.dtd">

  5: 

  6: <struts>

  7:     <package name="struts2" extends="struts-default">

  8:     <action name="login" class="cc.openhome.LoginAction">          

  9:       <result name="success">/success.jsp</result>

 10:       <result name="error">/error.jsp</result>

 11:     </action>

 12: </struts>

    6、success.jsp页面

  1: <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

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

  3: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

  4: <html>

  5:   <head>

  6:       <title>success</title>

  7:   </head>

  8:   <body>

  9:     <%=request.getAttribute("username")%>:您已经登录！

 10:   </body>

 11: </html>

 12:

    7、error.jsp页面

  1: <%@ page language="java" contentType="text/html; charset=UTF-8"

  2:     pageEncoding="UTF-8"%>

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

  4: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  5: <html>

  6:   <head>

  7:     <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

  8:     <title>error</title>

  9:   </head>

 10:   <body>

 11:       <%=request.getAttribute("username")%>:登录失败，请重新登录！

 12:   </body>

 13: </html>

    8、运行结果

技术分享 技术分享 技术分享

二、运行机制处理流程

技术分享

三、定义国际化资源

     1、定义两个语言资源文件，并且命名为message_zh_CN.properties和message_en_US.properties

     message_zh_CN.properties

  1: successPage=\u767B\u5F55\u6210\u529F\u9875\u9762

  2: failPage=\u767B\u5F55\u5931\u8D25\u9875\u9762

  3: user=\u7528\u6237\u540D

  4: pass=\u5BC6\u7801

  5: login=\u767B\u5F55

  6: welcome=\u6B22\u8FCE\uFF0C

  7: fail=\u767B\u5F55\u5931\u8D25\uFF0C

     message_en_US.properties

  1: successPage=successPage

  2: failPage=failPage

  3: user=username

  4: pass=password

  5: login=login

  6: welcome=welcome, 

  7: fail=fail,

    2、修改success.jsp

    输出国际化信息的方式有两种:

          (1)、<s:text name=”welcome” />

          (2)、<s:property value=”%{getText(“welcome”)}” />

  1: <%@ page language="java" import="java.util.*" pageEncoding="gbk"%>

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

  3: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

  4: <html>

  5:   <head>

  6:       <title><s:text name="successPage"/></title>

  7:   </head>

  8:   <body>

  9:     <%=request.getAttribute("username")%>:<s:text name="welcome"/>

 10:     您已经登录！

 11:   </body>

 12: </html>

    3、修改error.jsp

  1: <%@ page language="java" contentType="text/html; charset=UTF-8"

  2:     pageEncoding="UTF-8"%>

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

  4: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  5: <html>

  6:   <head>

  7:     <title><s:text name="successPage"/></title>

  8:   </head>

  9:   <body>

 10:       <%=request.getAttribute("username")%>:<s:text name="fail"/>请重新登录！

 11:   </body>

 12: </html>

    4、在struts.xml中添加<constant name="struts.custom.i18n.resources" value="message"/>

  1: <?xml version="1.0" encoding="UTF-8" ?>

  2: <!DOCTYPE struts PUBLIC

  3:   "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

  4:   "http://struts.apache.org/dtds/struts-2.3.dtd">

  5: 

  6: <struts> 

  7:     <constant name="struts.custom.i18n.resources" value="message"/>

  8:     <action name="login" class="cc.openhome.LoginAction">          

  9:         <result name="success">/success.jsp</result>

 10:         <result name="error">/error.jsp</result>

 12:     </action>

 13: </struts>

    5、运行结果

                                   技术分享         技术分享

三、增加数据校验

     继承ActionSupport类，它是一个工具类，实现了Action接口，还实现了Validateable接口，提供了数据校验功能。在Validateable接口中，定义了一个validate()方法，如果校验表单输入域出现错误，则将错误添加到ActionSupport类的fieldErrors域中，通过OGNL表达式负责输出。则LoginAction修改后为：

     1、LoginAction.java

  1: package cc.openhome;

  2: 

  3: import com.opensymphony.xwork2.Action;

  4: import com.opensymphony.xwork2.ActionContext;

  5: import com.opensymphony.xwork2.ActionSupport;

  6: 

  7: public class LoginAction extends ActionSupport implements Action {

  8:   private String username;

  9:   private String password;

 10:   public String getUsername() {

 11:     return username;

 12:   }

 13:   public void setUsername(String username) {

 14:     this.username = username;

 15:   }

 16:   public String getPassword() {

 17:     return password;

 18:   }

 19:   public void setPassword(String password) {

 20:     this.password = password;

 21:   }

 22:   

 23:   public String execute() throws Exception {

 24:     // TODO Auto-generated method stub

 25:     ActionContext ctx=ActionContext.getContext();

 26:     

 27:     if(getUsername().equals("nihao") && getPassword().equals("nihao")){

 28:       ctx.getSession().put("user", getUsername());

 29:       return SUCCESS;

 30:     }else{

 31:       return ERROR;

 32:     }

 33:   }

 34:   public void validate(){

 35:     if(getUsername()!=null || getUsername().trim().equals("")){

 36:       addFieldError("username", "user.required");

 37:     }

 38:     if(getPassword()!=null || getPassword().trim().equals("")){

 39:       addFieldError("password", "pass.required");

 40:     }

 41:   }

 42: }

 43:

     2、修改struts.xml

  1: <?xml version="1.0" encoding="UTF-8" ?>

  2: <!DOCTYPE struts PUBLIC

  3:   "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

  4:   "http://struts.apache.org/dtds/struts-2.3.dtd">

  5: 

  6: <struts> 

  7:     <constant name="struts.custom.i18n.resources" value="message"/>

  8:     <action name="login" class="cc.openhome.LoginAction">          

  9:         <result name="success">/success.jsp</result>

 10:         <result name="error">/error.jsp</result>

 11:         <result name="input">/denglu.jsp</result>

 12:     </action>

 13: </struts>

     3、运行结果

技术分享     4、校验信息的国际化

    (1)、message_zh_CN.properties

  1: successPage=\u767B\u5F55\u6210\u529F\u9875\u9762

  2: failPage=\u767B\u5F55\u5931\u8D25\u9875\u9762

  3: user.required=\u7528\u6237\u540D\u5FC5\u987B\u6B63\u786E\u8F93\u5165

  4: pass.required=\u5BC6\u7801\u5FC5\u987B\u6B63\u786E\u8F93\u5165

  5: user=\u7528\u6237\u540D

  6: pass=\u5BC6\u7801

  7: login=\u767B\u5F55

  8: welcome=\u6B22\u8FCE\uFF0C

  9: fail=\u767B\u5F55\u5931\u8D25\uFF0C

    (2)、message_en_US.properties

  1: successPage=successPage

  2: user.required=user.required

  3: pass.required=pass.required

  4: failPage=failPage

  5: user=username

  6: pass=password

  7: login=login

  8: welcome=welcome, 

  9: fail=fail,

     (3)、修改validate()方法

  1: public void validate(){

  2:     if(getUsername()!=null || getUsername().trim().equals("")){

  3:       addFieldError("username", getText("user.required"));

  4:     }

  5:     if(getPassword()!=null || getPassword().trim().equals("")){

  6:       addFieldError("password", getText("pass.required"));

  7:     }

  8:   }

    (4)、运行结果

技术分享

    5、使用Struts2的校验框架

        如果不需要写大量代码，可以用基于XWork的validator框架，新建一个校验规则文件即可。把文件命名为: LoginAction-validation.xml

    LoginAction-validation.xml

  1: <?xml version="1.0" encoding="UTF-8"?>

  2: <!DOCTYPE validators PUBLIC 

  3:   "-//Apache Struts//XWork Validator 1.0//EN"

  4:   "http://struts.apache.org/dtds/xwork-validator-1.0.dtd">

  5: <validators>

  6:   <field name="username">

  7:     <field-validator type="requiredstring">

  8:       <message key="user.required"/>

  9:     </field-validator>

 10:   </field>

 11:   <field name="password">

 12:     <field-validator type="requiredstring">

 13:       <message key="pass.required"/>

 14:     </field-validator>

 15:   </field>

 16: </validators>

Struts2的一个入门实例----登录功能

标签：line   ted   order   工具类   ant   新建   prefix   ognl   except   

原文地址：http://www.cnblogs.com/liuzhongfeng/p/6131039.html
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