<%--
Document : index
Created on : 2011-12-13, 9:47:34
Author : Administrator
--%><%@page contentType="text/html" pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>JSP Page</title>
</head>
<body bgcolor="#EAF0FB">
<%@ include file="/head.jsp"%>
<form action="Servlet1" method="post">
<table width="399" border="0" align="center" cellpadding="0" cellspacing="0" bordercolor="#EBEBEB">
<tr>
<td> </td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td> </td>
</tr>
<tr align="left">
<td height="35" colspan="2" bgcolor="#EAF0FB">
<div align="center"><span><strong>用 户 登 录 </strong></span></div>
</td>
</tr> <tr>
<td width="141" height="45" align="center" bgcolor="#EBEBEB">您的帐号:</td>
<td width="258" align="left" bgcolor="#EBEBEB"><input name="username" type="text" /></td>
</tr>
<tr> </tr>
<tr>
<td height="45" align="center" bgcolor="#EBEBEB">您的密码:</td>
<td align="left" bordercolor="#EBEBEB" bgcolor="#EBEBEB">
<input name="password" type="password" size="21" /></td>
</tr>
<tr>
<td height="60" colspan="2" bgcolor="#EAF0FB">
<div align="center"><input name="submit" type="submit"value="登 录" />
<input name="reset" type="reset" value="重 置" /></div>
</td>
</tr>
</table>
</form>
</body>
</html>
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
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;
import javax.servlet.http.HttpSession;
import test.checklogin;/**
*
* @author Administrator
*/
public class Servlet1 extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
/* TODO output your page here
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet Servlet1</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet Servlet1 at " + request.getContextPath () + "</h1>");
out.println("</body>");
out.println("</html>");
*/
} finally {
out.close();
}
} // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
} /**
* Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username=request.getParameter("username");
String password=request.getParameter("password");
HttpSession session=request.getSession(true);
checklogin ck=new checklogin();
ck.setUsername(username);
ck.setPassword(password);
String path = null ;
if(ck.checklogin())
{
session.setAttribute("uname",ck.getUsername()) ;
path = "login_succss.jsp" ;
}
else
{
path = "login_failure.jsp" ;
}
request.getRequestDispatcher(path).forward(request,response) ;
} /**
* Returns a short description of the servlet.
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>}/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/package test;import java.sql.*;/**
*
* @author Administrator
*/
public class checklogin {
private String username,password; public String getPassword() {
return password;
} public void setPassword(String password) {
this.password = password;
} public String getUsername() {
return username;
} public void setUsername(String username) {
this.username = username;
} public boolean checklogin(){
boolean flag = false ;
String driverClass = "org.gjt.mm.mysql.Driver";
String url = "jdbc:mysql://localhost:3306/bbs?useUnicode=true&characterEncoding=utf8";
String name = "root";
String passwd = "12345";
Connection conn = null ;
Statement stmt = null ;
ResultSet rs = null ;
String sql = null ;
try {
Class.forName(driverClass);
conn = DriverManager.getConnection(url, name, passwd);
stmt = conn.createStatement() ;
sql = "SELECT name FROM users WHERE id='"+username+"' and password='"+password+"'" ;
rs = stmt.executeQuery(sql) ;
if(rs.next())
{
flag=true ;
}
rs.close();
stmt.close() ;
conn.close() ;
} catch (Exception e) {
e.printStackTrace(System.err);
}
return flag;
}
}
Document : index
Created on : 2011-12-13, 9:47:34
Author : Administrator
--%><%@page contentType="text/html" pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>JSP Page</title>
</head>
<body bgcolor="#EAF0FB">
<%@ include file="/head.jsp"%>
<form action="Servlet1" method="post">
<table width="399" border="0" align="center" cellpadding="0" cellspacing="0" bordercolor="#EBEBEB">
<tr>
<td> </td>
</tr>
<tr>
<td> </td>
</tr>
<tr>
<td> </td>
</tr>
<tr align="left">
<td height="35" colspan="2" bgcolor="#EAF0FB">
<div align="center"><span><strong>用 户 登 录 </strong></span></div>
</td>
</tr> <tr>
<td width="141" height="45" align="center" bgcolor="#EBEBEB">您的帐号:</td>
<td width="258" align="left" bgcolor="#EBEBEB"><input name="username" type="text" /></td>
</tr>
<tr> </tr>
<tr>
<td height="45" align="center" bgcolor="#EBEBEB">您的密码:</td>
<td align="left" bordercolor="#EBEBEB" bgcolor="#EBEBEB">
<input name="password" type="password" size="21" /></td>
</tr>
<tr>
<td height="60" colspan="2" bgcolor="#EAF0FB">
<div align="center"><input name="submit" type="submit"value="登 录" />
<input name="reset" type="reset" value="重 置" /></div>
</td>
</tr>
</table>
</form>
</body>
</html>
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
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;
import javax.servlet.http.HttpSession;
import test.checklogin;/**
*
* @author Administrator
*/
public class Servlet1 extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
/* TODO output your page here
out.println("<html>");
out.println("<head>");
out.println("<title>Servlet Servlet1</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Servlet Servlet1 at " + request.getContextPath () + "</h1>");
out.println("</body>");
out.println("</html>");
*/
} finally {
out.close();
}
} // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
} /**
* Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String username=request.getParameter("username");
String password=request.getParameter("password");
HttpSession session=request.getSession(true);
checklogin ck=new checklogin();
ck.setUsername(username);
ck.setPassword(password);
String path = null ;
if(ck.checklogin())
{
session.setAttribute("uname",ck.getUsername()) ;
path = "login_succss.jsp" ;
}
else
{
path = "login_failure.jsp" ;
}
request.getRequestDispatcher(path).forward(request,response) ;
} /**
* Returns a short description of the servlet.
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>}/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/package test;import java.sql.*;/**
*
* @author Administrator
*/
public class checklogin {
private String username,password; public String getPassword() {
return password;
} public void setPassword(String password) {
this.password = password;
} public String getUsername() {
return username;
} public void setUsername(String username) {
this.username = username;
} public boolean checklogin(){
boolean flag = false ;
String driverClass = "org.gjt.mm.mysql.Driver";
String url = "jdbc:mysql://localhost:3306/bbs?useUnicode=true&characterEncoding=utf8";
String name = "root";
String passwd = "12345";
Connection conn = null ;
Statement stmt = null ;
ResultSet rs = null ;
String sql = null ;
try {
Class.forName(driverClass);
conn = DriverManager.getConnection(url, name, passwd);
stmt = conn.createStatement() ;
sql = "SELECT name FROM users WHERE id='"+username+"' and password='"+password+"'" ;
rs = stmt.executeQuery(sql) ;
if(rs.next())
{
flag=true ;
}
rs.close();
stmt.close() ;
conn.close() ;
} catch (Exception e) {
e.printStackTrace(System.err);
}
return flag;
}
}
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if(rs.next())
{
flag=true ;
}
这段没起作用??
检查:
web.xml对Servlet的配置
JDBC那一块是否访问没问题
应该没问题 我就是不清楚JDBC那段又没问题啊
*
* @author Administrator
*/
public class checklogin {
private String username,password; public String getPassword() {
return password;
} public void setPassword(String password) {
this.password = password;
} public String getUsername() {
return username;
} public void setUsername(String username) {
this.username = username;
} public boolean checklogin(){
boolean flag = false ;
String driverClass = "org.gjt.mm.mysql.Driver";
String url = "jdbc:mysql://localhost:3306/bbs?useUnicode=true&characterEncoding=utf8";
String name = "root";
String passwd = "12345";
Connection conn = null ;
Statement stmt = null ;
ResultSet rs = null ;
String sql = null ;
try {
Class.forName(driverClass);
conn = DriverManager.getConnection(url, name, passwd);
stmt = conn.createStatement() ;
sql = "SELECT name FROM users WHERE id='"+username+"' and password='"+password+"'" ;
rs = stmt.executeQuery(sql) ;
if(rs.next())
{
flag=true ;
} rs.close();
stmt.close() ;
conn.close() ;
} catch (Exception e) {
e.printStackTrace(System.err);
}
return flag;
}
}好吧 我错了 我主要想知道红色这段为什么没起效果
System.Out.printlf一下,看看控制台能不能打印出东西,程序有没有运行到这一块。
如果可以,再把得到的东西打印出来。
当然,最好是能Debug
你试试吧
debug最好了。