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Struts开发框架实例 及注意事项

2017-06-04 12:44 477 查看

在刚开始写第一个框架案例时:

    一.注意各个类型的文件的存储位置:

   二.特别注意web.xml和struts.xml的文件配置不能出错,下面是我配置的两个代码片:

            web.xml:               
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>
struts2
</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
<filter>
<filter-name>
struts2-cleanup
</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ActionContextCleanUp
</filter-class>
</filter>
<filter-mapping>
<filter-name>
struts2
</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>
struts2-cleanup
</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
             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">
<struts>
<constant name="struts.ui.theme" value="simple" />
<package name="test" extends="struts-default">
<action name="sayWelcome" class="myActions.sayHello">
<result name="success">/welcome.jsp</result>
<result name="input">/index.jsp</result>
</action>
</package>
</struts>
 另外的几个.jsp文件和.java文件如下                       index.jsp:    
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags" %>
<!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>第一个Struts 2应用</title>
</head>
<body>
<s:form action="sayWelcome">
请输入用户名:<s:textfield name="username" size="20"/>
<s:submit value="确定"/>
<s:reset value="重写"/>
</s:form>
<s:if test="hasFieldErrors()">
<s:fielderror/>
</s:if>
</body>
</html>
                                           welcome.jsp: 
<%@ 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>登录成功</title>
</head>
<body>
${username} ,欢迎光临!
</body>
</html>
                                                   sayHello.java:
package myActions;
import com.opensymphony.xwork2.ActionSupport;
public class sayHello extends ActionSupport {
private String username;
String getUsername(){return username;}
public void setUsername(String username){this.username=username;}
public String execute() throws Exception{
return SUCCESS;
}
public void validate(){
if(username==null||username.trim().length()<5){
addFieldError("username","用户名错误!");
}
}
}
 
  
                                            
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