Servlet使用中的问题

doGet处理get类型的数据
doPost处理post类型的数据
你是不是在servlet中只实现了doGet方法？

解决方案 »

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不对，不实现doPost是会报错的，看来你得贴出代码来才行。
这是我的servlet源程序(Login_server.java)
import java.io.* ;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.sql.*;
public class Login_server extends HttpServlet
{
private final String ENCODING="GB2312";
private final String CONTENT_TYPE="text/heml; charset=GB2312"; public void doGet(HttpServletRequest req,HttpServletResponse resp)
throws ServletException,IOException
{
resp.setContentType(CONTENT_TYPE);
PrintWriter out=resp.getWriter();

//get name and password from the requset
String logName=req.getParameter("name");
String logPassWord=req.getParameter("password");
int result=0; //if name or password is null , send error
if(logName==null || logPassWord==null)
{
resp.sendRedirect("/login/error.jsp");
/* out.println("<html><head><title>LoginError</title></head>");
out.println("<body>");
out.println("<center><H2>Please input your name and password!</H2>");
out.println("<br><br><br><br>");
out.println("Please check <a href='/login/login.jsp'>here</a> to login");
out.println("</center>");
out.println("</body>");
out.println("</html>");
*/
}
else
{
result=exist(logName,logPassWord); //confirm whether the user exists in the database
if (result==1) //exists,success
{
resp.sendRedirect("/login/succes.html");
}
else //has not resgistered,error
{
resp.sendRedirect("/login/error.jsp");
} }
} public void doPost(HttpServletRequest req,HttpServletResponse resp)
throws ServletException,IOException
{
doGet(req,resp);
}

//////////////////////////////////////////////////////////////
// function name:exist    confirm whether the user exists in the database
// parameter loginName  (string)  ; loginpassword  (string)
// return  1--exists; 0--not exist
//////////////////////////////////////////////////////////////////////
int exist(String logName,String logPassWord)
{
try
{
Class.forName("COM.cloudscape.core.JDBCDriver").newInstance();
Connection con=DriverManager.getConnection("jdbc:cloudscape:login","","");
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery("SELECT name,password FROM login");
String user,pass;
while (rs.next())
{
user=rs.getString("name");
    pass=rs.getString("password");
if (user.equals(logName) && pass.equals(logPassWord))
{
rs.close();
stmt.close();
con.close();
return 1;
}
}
rs.close();
stmt.close();
con.close();
return 0;
}
catch(Exception e) {};
return 1;
}};
这是web.xml的配置<?xml version="1.0" encoding="ISO-8859-1"?><!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
    "http://java.sun.com/dtd/web-app_2_3.dtd"><web-app>
  <display-name>Welcome to Tomcat</display-name>
  <description>
     Welcome to Tomcat
  </description>
    <servlet>
        <servlet-name>org.apache.jsp.index_jsp</servlet-name>
        <servlet-class>org.apache.jsp.index_jsp</servlet-class>
    </servlet> <servlet>
        <servlet-name>HelloWorld</servlet-name>
        <servlet-class>HelloWorld</servlet-class>
    </servlet> <servlet-mapping>
        <servlet-name>HelloWorld</servlet-name>
        <url-pattern>/HelloWorld</url-pattern>
    </servlet-mapping>     <servlet-mapping>
        <servlet-name>org.apache.jsp.index_jsp</servlet-name>
        <url-pattern>/index.jsp</url-pattern>
    </servlet-mapping> <servlet>
        <servlet-name>Hello</servlet-name>
        <servlet-class>Hello</servlet-class>
    </servlet> <servlet-mapping>
        <servlet-name>Hello</servlet-name>
        <url-pattern>/form.html</url-pattern>
    </servlet-mapping> <servlet>
        <servlet-name>Login_server</servlet-name>
        <servlet-class>Login_server</servlet-class>
    </servlet> <servlet-mapping>
        <servlet-name>Login_server</servlet-name>
        <url-pattern>/login/login.jsp</url-pattern>
    </servlet-mapping> <servlet>
        <servlet-name>Register_server</servlet-name>
        <servlet-class>Register_server</servlet-class>
    </servlet> <servlet-mapping>
        <servlet-name>Register_server</servlet-name>
        <url-pattern>/login/register.jsp</url-pattern>
    </servlet-mapping>
</web-app>