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<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>Example</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>GetPic</display-name>
<servlet-name>GetPic</servlet-name>
<servlet-class>GetPic</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>GetPic</servlet-name>
<url-pattern>/GetPic</url-pattern>
</servlet-mapping>
<servlet>
<description></description>
<display-name>Login</display-name>
<servlet-name>Login</servlet-name>
<servlet-class>Login</servlet-class>
<init-param>
<param-name>userName</param-name>
<param-value>guest</param-value>
</init-param>
<init-param>
<param-name>userPwd</param-name>
<param-value>123456</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>Login</servlet-name>
<url-pattern>/Login</url-pattern>
</servlet-mapping>
<filter>
<display-name>ValidLogin</display-name>
<filter-name>ValidLogin</filter-name>
<filter-class>ValidLogin</filter-class>
</filter>
<filter-mapping>
<filter-name>ValidLogin</filter-name>
<url-pattern>/admin/*</url-pattern>
</filter-mapping>
</web-app>
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
* Servlet Filter implementation class ValidLogin
*/
public class ValidLogin implements Filter {
/**
* Default constructor.
*/
public ValidLogin() {
// TODO Auto-generated constructor stub
}
/**
* @see Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
}
/**
* @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
// place your code here
HttpServletRequest hsr=(HttpServletRequest)request;
HttpSession session=hsr.getSession();
if(session.getAttribute("UserName")!=null)
{
// pass the request along the filter chain
chain.doFilter(request, response);
}
else
{
HttpServletResponse hresponse=(HttpServletResponse)request;
hresponse.sendRedirect("../index.jsp");
}
}
/**
* @see Filter#init(FilterConfig)
*/
public void init(FilterConfig fConfig) throws ServletException {
// TODO Auto-generated method stub
}
}
import java.io.IOException;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
* Servlet implementation class Login
*/
public class Login extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Login() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doPost(request,response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
String userName=request.getParameter("loginName");
String userPwd=request.getParameter("loginPwd");
String userCode=request.getParameter("loginCode");
ServletConfig sc= this.getServletConfig();
String saveUserName=sc.getInitParameter("userName");
String saveUserPwd=sc.getInitParameter("userPwd");
HttpSession session=request.getSession();
String saveUserCode=session.getAttribute("validCode").toString();
if(userName.equals(saveUserName)&& userPwd.equals(saveUserPwd)&& userCode.equals(saveUserCode))
{
session.setAttribute("UserName", userName);
response.sendRedirect("./admin/index.jsp");
}
else
{
response.sendRedirect("./index.jsp");
}
}
}
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
* Servlet implementation class GetPic
*/
public class GetPic extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public GetPic() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("image/jpeg");
BufferedImage image=new BufferedImage(60,30,BufferedImage.TYPE_INT_RGB);
Graphics g=(Graphics)image.getGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, 120, 80);
String validCode=funGetRandNum();
HttpSession session=request.getSession();
session.setAttribute("validCode", validCode);
g.setColor(Color.RED);
g.setFont(new Font("黑体",24,20));
g.drawString(validCode, 10, 20);
ServletOutputStream out=response.getOutputStream();
try{
ImageIO.write(image, "jpg", out);
}catch(IOException ex){}
}
private String funGetRandNum()
{
String source="1234567890abcdefghiklmvysz";
String retStr="";
Random rnd=new Random();
for(int i=0;i<4;i++)
{
int k=Math.abs(rnd.nextInt());
k=k%source.length();
retStr=retStr+source.charAt(k);
}
return retStr;
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request,response);
}
}