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感谢抽空看这个求助！出现问题： HTTP Status 404 - /sb/Registration type Status report message /sb/Registration description The requested resource (/sb/Registration) is not available. Apache Tomcat/6.0.30 不懂是哪步错了。估计可能是web.xml没写好。我的流程是：在Tomcat6.0目录下，webapps目录下新建sb这个文件夹，这个文件夹里又有classes文件夹以及Registration.html和web.xml。我将Registration.class，Registration$Student.class放入classes中。这是我的Registration.java: import javax.servlet.*; import javax.servlet.http.*; import java.io.*; import java.sql.*; public class Registration extends HttpServlet{ private PreparedStatement pstmt; public void init() throws ServletException{ initializeJdbc(); } public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{ response.setContentType("text/html"); PrintWriter out = response.getWriter(); String lastName=request.getParameter("lastName"); String firstName=request.getParameter("firstName"); String password=request.getParameter("password"); String email=request.getParameter("email"); Student student=new Student(lastName,firstName,password,email); HttpSession httpSession=request.getSession(); httpSession.setAttribute("student", student); out.println("You entered the following data:"); out.println("<p>Last name:"+lastName); out.println("<p>First name:"+firstName); out.println("<p>Password:"+password); out.println("<p>Email:"+email); out.println("<p>form method=\"post\" action=/sb/Registration>"); out.println("<p><input type=\"submit\" value=\"Confirm\">"); out.println("</form>"); out.close(); } public void doPost(HttpServletRequest request,HttpServletResponse response)throws ServletException,IOException{ response.setContentType("text/html"); PrintWriter out = response.getWriter(); HttpSession httpSession = request.getSession(); Student student = (Student)(httpSession.getAttribute("student")); try{ storeStudent(student); out.println(student.lastName+" "+student.firstName+"is now registered in the database"); out.close(); } catch(Exception ex){ out.println("Error:"+ex.getMessage()); return; } } private void initializeJdbc(){ try{ Class.forName("com.mysql.jdbc.Driver"); System.out.println("Driver loaded"); Connection conn=DriverManager.getConnection("jdbc:MYSQL://localhost/test"); System.out.println("Database connected"); pstmt = conn.prepareStatement("insert into user(lastName,firstName,password,email)values(?,?,?,?)"); } catch(Exception ex){ System.out.println(ex); } } private void storeStudent(Student student) throws SQLException{ pstmt.setString(1,student.getLastName()); pstmt.setString(2,student.getFirstName()); pstmt.setString(3,student.getPassword()); pstmt.setString(4,student.getEmail()); pstmt.executeUpdate(); } class Student{ private String lastName=""; private String firstName=""; private String password=""; private String email=""; Student(String lastName,String firstName,String password,String email){ this.lastName=lastName; this.firstName=firstName; this.password=password; this.email=email; } public String getLastName(){ return lastName; } public String getFirstName(){ return firstName; } public String getPassword(){ return password; } public String getEmail(){ return email; } } } 这是我的xml： <web-app> <servlet> <servlet-name>Registration</servlet-name> <servlet-class>Registration</servlet-class> </servlet> <servlet-mapping> <servlet-name>Registration</servlet-name> <url-pattern>/Registration</url-pattern> </servlet-mapping> </web-app> 这是我的Registration.html: <html> <head> <title>Registration</title> </head> <body> Please register. <form method="get" action ="http://localhost:8080/sb/Registration"> <p>Last Name <font color = "#FF0000">*</font> <input type = "text" name = "lastName" > First Name <font color = "#FF0000">*</font> <input type = "text" name = "firstName" > </p> <p>Password <input type = "text" name = "password" > Email <input type = "text" name = "email" > </p> <p><input type = "submit" name = "Submit" value="Submit" > <input type = "reset" value="Reset" > </p> </form> </body> </html>

求助啊。HTTP Status 404错误