public UserDatabaseServlet() { super(); } public void destroy() { getServletContext().removeAttribute(Contants.DATABASE_KEY);
} public int getDebug(){ return this.debug; }
public void addUser(UserBean user){ database.put(user.getUserName(),user);
} /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); out.println("<HTML>"); out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); out.println(" <BODY>"); out.print(" This is "); out.print(this.getClass()); out.println(", using the GET method"); out.println(" </BODY>"); out.println("</HTML>"); out.flush(); out.close(); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); out.println("<HTML>"); out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); out.println(" <BODY>"); out.print(" This is "); out.print(this.getClass()); out.println(", using the POST method"); out.println(" </BODY>"); out.println("</HTML>"); out.flush(); out.close(); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occure */ public void init() throws ServletException{ // Put your code here String value; value=getServletConfig().getInitParameter("debug"); try{ debug=Integer.parseInt(value); }catch(Throwable t){ debug=0; } if(debug>=1) log("Initializing database servlet"); value=getServletConfig().getInitParameter("pathname"); if(value!=null) pathname=value; try{ load(); getServletContext().setAttribute(Contants.DATABASE_KEY,database); System.out.println(Contants.DATABASE_KEY); }catch(Exception e){ } } private synchronized void load() throws Exception{ database=new Hashtable(); if(debug>=1) log("Loading database from "+"'"+pathname+"'"); InputStream is=getServletContext().getResourceAsStream(pathname); if(is==null){ log("No such resource available-loading empty database"); return; } BufferedInputStream bis=new BufferedInputStream(is); Digester digester=new Digester(); digester.push(this); digester.setDebug(debug); digester.setValidating(false); digester.addObjectCreate("database/user","Address.model.UserBean"); digester.addSetProperties("database/user"); digester.addSetNext("database/user","addUser"); digester.parse(bis); bis.close(); } }
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Hashtable;import javax.resource.spi.UnavailableException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import modle.UserBean;import org.apache.commons.digester.Digester;import com.yourcompany.struts.action.*;public class UserDatabaseServlet extends HttpServlet { private Hashtable database=null;
private int debug=0;
private String pathname="/WEB-INF/unserdatabase.xml";
public UserDatabaseServlet() {
super();
} public void destroy() {
getServletContext().removeAttribute(Contants.DATABASE_KEY);
} public int getDebug(){
return this.debug;
}
public void addUser(UserBean user){
database.put(user.getUserName(),user);
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
} /**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the POST method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
} /**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occure
*/
public void init() throws ServletException{
// Put your code here
String value;
value=getServletConfig().getInitParameter("debug");
try{
debug=Integer.parseInt(value);
}catch(Throwable t){
debug=0;
}
if(debug>=1)
log("Initializing database servlet");
value=getServletConfig().getInitParameter("pathname");
if(value!=null)
pathname=value;
try{
load();
getServletContext().setAttribute(Contants.DATABASE_KEY,database);
System.out.println(Contants.DATABASE_KEY);
}catch(Exception e){
}
}
private synchronized void load() throws Exception{
database=new Hashtable();
if(debug>=1)
log("Loading database from "+"'"+pathname+"'");
InputStream is=getServletContext().getResourceAsStream(pathname);
if(is==null){
log("No such resource available-loading empty database");
return;
}
BufferedInputStream bis=new BufferedInputStream(is);
Digester digester=new Digester();
digester.push(this);
digester.setDebug(debug);
digester.setValidating(false);
digester.addObjectCreate("database/user","Address.model.UserBean");
digester.addSetProperties("database/user");
digester.addSetNext("database/user","addUser");
digester.parse(bis);
bis.close();
}
}
这个文件存在不?
<servlet-name>UserDatabaseServlet</servlet-name>
<url-pattern>/servlet/UserDatabaseServlet</url-pattern>
</servlet-mapping>我把<servlet-mapping > 删掉是否有影响?
<user userName="guest" password="guest">
</user>
</database>