index.jsp文件
----------------------------------------
<body>
<font color="red">
<%=session.getAttribute("message")==null ? "" :session.getAttribute("message") %>
</font>
<form action="<%=path%>/CheckCodes" method="post">
name:<input type="text" name="name" />
checkCode:<input type="text" name="CHECK_CODE_PARAM_NAME"/>
<img alt="" src="<%=path%>/Checkcode">
<input type="submit" value="Submit" />
</form>
</body>
Checkcode.java的servlet文件
---------------------------------------------------
<body>
<font color="red">
<%=session.getAttribute("message")==null ? "" :session.getAttribute("message") %>
</font>
<form action="<%=path%>/CheckCodes" method="post">
name:<input type="text" name="name" />
checkCode:<input type="text" name="CHECK_CODE_PARAM_NAME"/>
<img alt="" src="<%=path%>/Checkcode">
<input type="submit" value="Submit" />
</form>
</body>
CheckCodes.java的servlet文件
------------------------------------------------------
package com.checkcode;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class CheckCodes extends HttpServlet {
protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException ,IOException{
String paramCode = request.getParameter("CHECK_CODE_PARAM_NAME");
String sessionCode = (String)request.getSession().getAttribute("CHECK_CODE_KEY");
if(!(paramCode!=null && paramCode.equals(sessionCode))){
request.getSession().setAttribute("message", "验证码不同");
response.sendRedirect(request.getContextPath()+"/index.jsp");
return;
}
}
}
web.xml配置文件
---------------------------------------------------------------
<?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">
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>Checkcode</servlet-name>
<servlet-class>com.checkcode.Checkcode</servlet-class>
</servlet>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>CheckCodes</servlet-name>
<servlet-class>com.checkcode.CheckCodes</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Checkcode</servlet-name>
<url-pattern>/Checkcode</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>CheckCodes</servlet-name>
<url-pattern>/CheckCodes</url-pattern>
</servlet-mapping>