Hi,
I wrote one simple struts program for login page.
struts-config.xml:--------------------------
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE struts-config SYSTEM "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">
<struts-config>
<form-beans >
<form-bean name="loginBean" type="com.sam.bean.loginBean" />
</form-beans>
<action-mappings>
<action path="/login" name = "loginBean" type = "com.sam.action.loginAction"
scope= "request" input="/login.jsp">
<forward name="success" path="/home.jsp"></forward>
<forward name="failure" path="/login.jsp"></forward>
</action>
</action-mappings>
<!-- <message-resources parameter="MessageResources" /> -->
</struts-config>
login.jsp:--------------------
<%@taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<!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=ISO-8859-1">
<title>Login Page</title>
</head>
<body>
<html:form action="/login.do">
<table>
<tr>
<td>User Id :</td>
<td><html:text property="text" name="userId"/></td>
</tr>
<tr>
<td>Password :</td>
<td><html:text property="password" name="password"/></td>
</tr>
<tr>
<td colspan="2" align="center">
<html:submit value= "login" ></html:submit>
</td>
</tr>
</table>
</html:form>
</body>
</html>
-----------------------------------------
home.jsp
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<!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=ISO-8859-1">
<title>Welcome Struts Project </title>
</head>
<body>
<h1>Welcome Struts Project </h1>
<h1>
Hi <bean:write name ="userId" scope = "request"/>
</h1>
</body>
</html>
------------------------------
loginAction.java
package com.sam.action;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import com.sam.bean.loginBean;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class loginAction extends Action{
public ActionForward execute(ActionMapping am , ActionForm af,
HttpServletRequest req, HttpServletResponse res) throws Exception
{
loginBean lb = (loginBean)af;
String userId = lb.getUserId();
String password = lb.getPassword();
String str = "failure";
if(userId.equals(password))
{
str = "success";
req.setAttribute("userId", userId);
}
ActionForward aFwd = am.findForward(str);
return aFwd;
}
}
-----------------------------------
loginBean.java
package com.sam.bean;
import org.apache.struts.action.ActionForm;
public class loginBean extends ActionForm{
private String userId;
private String password;
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
}
-----------------------------------------
web.xml:
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE web-app SYSTEM "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
<display-name>Struts Examples Application</display-name>
<!-- Standard Action Servlet Configuration (with debugging) -->
<servlet>
<servlet-name>action</servlet-name>
<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<!-- module configurations -->
<init-param>
<param-name>debug</param-name>
<param-value>2</param-value>
</init-param>
<init-param>
<param-name>detail</param-name>
<param-value>2</param-value>
</init-param>
<load-on-startup>2</load-on-startup>
</servlet>
<!-- Standard Action Servlet Mapping -->
<servlet-mapping>
<servlet-name>action</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<!-- The Usual Welcome File List -->
<!-- Struts Tag Library Descriptors -->
<taglib>
<taglib-uri>/tags/struts-bean</taglib-uri>
<taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/tags/struts-html</taglib-uri>
<taglib-location>/WEB-INF/struts-html.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/tags/struts-logic</taglib-uri>
<taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
</taglib>
<taglib>
<taglib-uri>/tags/struts-nested</taglib-uri>
<taglib-location>/WEB-INF/struts-nested.tld</taglib-location>
</taglib>
<!-- tiles not used here
<taglib>
<taglib-uri>/tags/struts-tiles</taglib-uri>
<taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
</taglib>
-->
</web-app>
---------------------------------
Error getting:
url:http://localhost:8080/StrutsProject/login.do
HTTP Status 500 -
--------------------------------------------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:516)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:423)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397)
javax.servlet.http.HttpServlet.service(HttpServlet.java:627)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
root cause
java.lang.NullPointerException
com.sam.action.loginAction.execute(loginAction.java:23)
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397)
javax.servlet.http.HttpServlet.service(HttpServlet.java:627)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.30 logs.
--------------------------------------------------------------------------------
Apache Tomcat/5.5.30
can anybody solve my problem?
Please tell me how to rum this program??
Thanks in advance
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