📄 chat_login.java

📁 jsp 应用开发详解源代码电子工业出版社包含书中个源代码
💻 JAVA
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package ec;import javax.servlet.*;import javax.servlet.http.*;import java.io.*;import java.util.*;import java.sql.*;public class chat_login extends HttpServlet {  private static final String CONTENT_TYPE = "text/html; charset=GBK";  /**Initialize global variables*/  public void init() throws ServletException {    String sDBDriver = "sun.jdbc.odbc.JdbcOdbcDriver";    try {      Class.forName(sDBDriver);    }    catch(java.lang.ClassNotFoundException e) {      System.err.println( e.getMessage());    }  }  public ResultSet executeQuery(String sql) {    String sConnStr = "jdbc:odbc:faq";    Connection connect = null;    ResultSet rs = null;    rs = null;    try {      connect = DriverManager.getConnection(sConnStr);      Statement stmt = connect.createStatement();      rs = stmt.executeQuery(sql);    }    catch(SQLException ex) {      System.err.println(ex.getMessage());    }    return rs;  }  public String getStr(String str)  {	try	{		String temp_p=str;		byte[] temp_t=temp_p.getBytes("ISO8859-1");		String temp=new String(temp_t);		return temp;	}	catch(Exception e)	{	}	return "null";  }  /**Process the HTTP Get request*/  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    response.setContentType(CONTENT_TYPE);    PrintWriter out = response.getWriter();    HttpSession session=request.getSession(true);    out.println("<html>");    out.println("<head><title>chat_login</title></head>");    out.println("<body>");    out.println(" <TABLE border=0 cellPadding=0 cellSpacing=0 width=760 align=\"center\">");    out.println("  <TBODY>");    out.println("  <tr><td align=\"left\" height=25>");    if(session.getAttribute("username")!=null)    {      out.println(session.getAttribute("username"));    }    out.println("  当前位置：<a href=\"../index.jsp\">首页</a> -&gt; 成员服务  </td>");    out.println("  <td align=\"right\">  </td>");    out.println("  </tr>");    out.println("  <TR bgColor=#3399ff>");    out.println("    <TD height=1 colspan=\"2\"><IMG height=1 src=\"images/spacer.gif\"");    out.println("  width=16></TD></TR>");    out.println("  <tr><td height=10 colspan=\"2\"><IMG height=1 src=\"images/spacer.gif\"");    out.println("  width=16></td></tr>");    out.println("  </TBODY></TABLE>");    out.println("");    out.println("  <table align=\"center\" border=\"0\" width=\"760\" cellspacing=\"0\" cellpadding=\"0\" ");    out.println("height=\"355\">");    out.println("	<tr>");    out.println("		<td width=\"150\" height=\"355\" valign=\"top\">");    out.println("");    out.println("		</td>");    out.println("		<td width=\"10\" height=\"100%\"></td>");    out.println("		<td width=\"1\" height=\"100%\" bgcolor=\"#3399ff\"></td>");    out.println("		<td width=\"10\" height=\"100%\"></td>");    out.println("		<td width=\"589\" height=\"331\" valign=\"top\" background=\"images/bg1.gif\">");    out.println("        <table border=\"0\" width=\"100%\" cellspacing=\"0\" cellpadding=\"0\" height=\"307\">");    out.println("          <tr>");    out.println("            <td width=\"100%\" colspan=\"2\" height=\"20\" bgcolor=\"#3399ff\">&nbsp;<font color=\"#ffffff\">成员登录</font>");    out.println("			</td>");    out.println("		  </tr>");    out.println("");    out.println("	<tr><td align=\"right\" height=\"32\" width=\"40%\">");    out.println("	<font color=red></font>");    out.println("	</td>");    out.println("	</tr>");    out.println("  	<form action=\"\" method=\"post\">");    out.println("		<tr><td align=\"right\" height=\"32\" width=\"40%\">名字：</td>");    out.println("            <td>");    out.println("              <input type=\"hidden\" name=\"returl\" value=\"\">");    out.println("			  <input type=\"text\" name=\"logname\" value=\"\">");    out.println("            </td>");    out.println("          </tr>");    out.println("          <tr>");    out.println("            <td align=\"right\"  height=\"32\">密码：</td>");    out.println("            <td>");    out.println("              <input type=\"password\" name=\"logpass\">");    out.println("            </td>");    out.println("          </tr>");    out.println("          <tr>");    out.println("            <td align=\"center\" colspan=\"2\" height=\"32\"> |");    out.println("			  <a href=\"../member/findpass.jsp\">密码忘了，找一下</a> |");    out.println("			  <a href=\"../member/reg.jsp\">注册新用户</a> |");    out.println("              <input type=\"submit\" name=\"login\" value=\"GO!\">");    out.println("            </td>");    out.println("          </tr>");    out.println("		  </form>");    out.println("	  <tr> ");    out.println("			  <td colspan=\"2\" align=\"right\">&nbsp;</td>");    out.println("");    out.println("	</tr>");    out.println("	   ");    out.println("     </table> ");    out.println("        </td>");    out.println("    </tr>");    out.println("  </table>");    out.println("</body></html>");  }  /**Process the HTTP Post request*/  public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    response.setContentType(CONTENT_TYPE);    PrintWriter out = response.getWriter();    HttpSession session=request.getSession(true);    String logname,logpass;    boolean loginAttempt = false;    boolean loginOK = false;    String errorMessage = "请您登陆";    if(request.getParameterValues("login") != null    && request.getParameterValues("login")[0].trim().equals("GO!")    &&request.getParameterValues("logname") != null    &&request.getParameterValues("logpass") != null)    {            loginAttempt = true;    }    if (loginAttempt)    {	logname=request.getParameter("logname");	logpass=request.getParameter("logpass");	logname=getStr(logname);	logpass=getStr(logpass);	String sql="select * from member where logname='"+logname+"' and password='"+logpass+"'";	ResultSet RS=executeQuery(sql);	int rowscount=0;	try	{		while(RS.next())		{			rowscount++;		}	}	catch(Exception e)	{	}	if(rowscount!=0)	{		errorMessage="成功登陆";		session.setAttribute("username",logname);		loginOK=true;		if(loginOK){		String url;		url=request.getParameter("url");		out.println(url);			if(url==null){				response.sendRedirect("http://localhost:9090/test/ec");			}			else{				response.sendRedirect("http://localhost:9090"+url);			}		}	}else{	errorMessage="您的用户名或者密码不正确";	session.setAttribute("username","");	}}    out.println("<html>");    out.println("<head><title>chat_login</title></head>");    out.println("<body>");    out.println(" <TABLE border=0 cellPadding=0 cellSpacing=0 width=760 align=\"center\">");    out.println("  <TBODY>");    out.println("  <tr><td align=\"left\" height=25>");    if(session.getAttribute("username")!=null)    {      out.println(session.getAttribute("username"));    }    out.println("  当前位置：<a href=\"../index.jsp\">首页</a> -&gt; 成员服务  </td>");    out.println("  <td align=\"right\">  </td>");    out.println("  </tr>");    out.println("  <TR bgColor=#3399ff>");    out.println("    <TD height=1 colspan=\"2\"><IMG height=1 src=\"images/spacer.gif\"");    out.println("  width=16></TD></TR>");    out.println("  <tr><td height=10 colspan=\"2\"><IMG height=1 src=\"images/spacer.gif\"");    out.println("  width=16></td></tr>");    out.println("  </TBODY></TABLE>");    out.println("");    out.println("  <table align=\"center\" border=\"0\" width=\"760\" cellspacing=\"0\" cellpadding=\"0\" ");    out.println("height=\"355\">");    out.println("	<tr>");    out.println("		<td width=\"150\" height=\"355\" valign=\"top\">");    out.println("");    out.println("		</td>");    out.println("		<td width=\"10\" height=\"100%\"></td>");    out.println("		<td width=\"1\" height=\"100%\" bgcolor=\"#3399ff\"></td>");    out.println("		<td width=\"10\" height=\"100%\"></td>");    out.println("		<td width=\"589\" height=\"331\" valign=\"top\" background=\"images/bg1.gif\">");    out.println("        <table border=\"0\" width=\"100%\" cellspacing=\"0\" cellpadding=\"0\" height=\"307\">");    out.println("          <tr>");    out.println("            <td width=\"100%\" colspan=\"2\" height=\"20\" bgcolor=\"#3399ff\">&nbsp;<font color=\"#ffffff\">成员登录</font>");    out.println("			</td>");    out.println("		  </tr>");    out.println("");    out.println("	<tr><td align=\"right\" height=\"32\" width=\"40%\">");    out.println("	<font color=red>"+errorMessage+"</font>");    out.println("	</td>");    out.println("	</tr>");    out.println("  	<form action=\"\" method=\"post\">");    out.println("		<tr><td align=\"right\" height=\"32\" width=\"40%\">名字：</td>");    out.println("            <td>");    out.println("              <input type=\"hidden\" name=\"returl\" value=\"\">");    out.println("			  <input type=\"text\" name=\"logname\" value=\"\">");    out.println("            </td>");    out.println("          </tr>");    out.println("          <tr>");    out.println("            <td align=\"right\"  height=\"32\">密码：</td>");    out.println("            <td>");    out.println("              <input type=\"password\" name=\"logpass\">");    out.println("            </td>");    out.println("          </tr>");    out.println("          <tr>");    out.println("            <td align=\"center\" colspan=\"2\" height=\"32\"> |");    out.println("			  <a href=\"../member/findpass.jsp\">密码忘了，找一下</a> |");    out.println("			  <a href=\"../member/reg.jsp\">注册新用户</a> |");    out.println("              <input type=\"submit\" name=\"login\" value=\"GO!\">");    out.println("            </td>");    out.println("          </tr>");    out.println("		  </form>");    out.println("	  <tr> ");    out.println("			  <td colspan=\"2\" align=\"right\">&nbsp;</td>");    out.println("");    out.println("	</tr>");    out.println("	   ");    out.println("     </table> ");    out.println("        </td>");    out.println("    </tr>");    out.println("  </table>");    out.println("</body></html>");  }  /**Clean up resources*/  public void destroy() {  }}
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