（1）<s:fielderror />放在JSP中，如果没在web.xml中配置filter相关内容，会有The Struts dispatcher cannot be found.从而显示报错。
HTTP Status 500 - An exception occurred processing JSP page /regist.jsp at line 36
主要还是因为缺乏导入的包，对于console中的missing,not found和add这些关键字都需要注意，会提示需要导入的包。
（2）需要导入的包
（3）struts2.5.5，其web.xml的配置如下。
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name></display-name>
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
其中filter-class的值在struts2中配置如下，否则出错：
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
（4）struts.xml的配置如下：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<constant name="struts.i18n.encoding" value="gb2312"></constant>
<package name="shop" namespace="/" extends="struts-default">
<action name="login" class="com.wss.action.LoginAction">
<result name="success" type="chain">show</result>
<result name="error">/login.jsp</result>
</action>
<action name="regist" class="com.wss.action.RegistAction">
<result name="success">/login.jsp</result>
<result name="error">/resist.jsp</result>
</action>
<action name="show" class="com.wss.action.ShowAction">
<result name="success">/suc.jsp</result>
<result name="error">/error.jsp</result>
</action>
<action name="car" class="com.wss.action.CarAction">
<result name="success">/car.jsp</result>
</action>
</package>
</struts>
（5）还有log4j2.xml的配置，但是我现在还不知道这个是做什么用的额。
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
</Console>
</Appenders>
<Loggers>
<Logger name="com.demo.NamedHierarchy" level="trace">
<AppenderRef ref="Console"/>
</Logger>
<Logger name="com.demo" level="debug">
<AppenderRef ref="Console"/>
</Logger>
<Root level="error">
<AppenderRef ref="Console"/>
</Root>
</Loggers>
</Configuration>
（6）整个项目代码的布局结构是如下：
（7）一个Action的实例：
package com.wss.action;
import com.opensymphony.xwork2.ActionSupport;
import com.wss.Dao.School;
import com.wss.Dao.User;
import com.wss.Dao.UserDao;
public class RegistAction extends ActionSupport{
public RegistAction()
{
System.out.println("Initialization RegistAction....");
}
private User user =new User();
//private User user;
public User getUser() {
System.out.println("Getting the getUser");
return user;
}
public void setUser(User user) {
System.out.println("Setting the setUser");
this.user = user;
}
private School school;
public School getSchool() {
System.out.println("Getting the getSchool");
return school;
}
public void setSchool(School school) {
System.out.println("Setting the setSchool");
this.school = school;
}
private String company;
public void setCompany(String company)
{
System.out.println("Setting the company");
this.company=company;
}
public String execute() throws Exception{
UserDao ud =new UserDao();
System.out.println("The company is "+this.company+" The name is "+this.user.getName()+" The phone is "+this.user.getAddress());
System.out.println("The school name is "+this.school.getName()+" The city is "+this.school.getCity()+" The department is "+ this.school.getDepartment());
//if(ud.regist(user)!=0){
this.addFieldError("success", "注册成功");
return SUCCESS;
//}
//this.addFieldError("error", "注册失败");
//return ERROR;
}
}
（8）其中regist.sjp的代码如下：
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%@ page contentType="text/html;charset=gbk"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<%
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>
<base href="<%=basePath%>">
<title>京东商城注册页面</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<%
request.setCharacterEncoding("gbk");
%>
</head>
<body>
<center>
<form action="regist" method="post">
用户名：<input type="text" name="user.name"/><br>
密 码:<input type="password" name="user.password"/><br>
手 机：<input type="text" name="user.phone" /><br>
地 址：<input type="text" name="user.address"/><br>
公 司： <input type="text" name="company"/> <br>
学 校：<input type="text" name="school.name"/>
城 市：<input type="text" name="school.city" />
院 系：<input type="text" name="school.department" />
<table>
<tr>
<td><input type="submit" value="注册"/></td>
<td><input type="reset" value="重置" ></td>
</tr>
</table>
</form>
<s:fielderror />
</center>
</body>
</html>
时间： 2024-08-23 11:40:10