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上午符號提示做一個Java RMI基於網絡的程序，由Registration_interface.java（Java接口）的，Registration_server.java（Java類）和login.java與login.jsp（servlet的），但服務器側有一個問題，如何解決無法找到的Java方法的RequestDispatcher
if (rs.next()) {
RequestDispatcher rd =request.getRequestDispatcher("register.jsp");
rd.forward(request, response);
}
可以在任何幫助我：
Registration_interface.java（interace側）
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface Registration_interface extends Remote {
public String login(String User, String Pass) throws RemoteException;
}
Registration_server.java（服務器端）
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;
import java.sql.*;
import javax.servlet.RequestDispatcher;
public class Registration_server extends UnicastRemoteObject implements Registration_interface {
public Registration_server() throws RemoteException {
System.out.println("server initialized.....");
}
public String login(String User, String Pass) throws RemoteException {
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/users", "root", "2200");
String sql = "SELECT * FROM user where UserName=('" + User + "') and Password=('" + Pass + "')";
Statement st = conn.createStatement();
ResultSet rs = st.executeQuery(sql);
if (rs.next()) {
RequestDispatcher rd = request.getRequestDispatcher("register.jsp");
rd.forward(request, response);
}
} catch (Exception e) {
e.printStackTrace();
}
return "Sucess";
}
public static void main(String[] args) {
Registration_server server = null;
try {
server = new Registration_server();
Registry registry = LocateRegistry.createRegistry(127);// default:1099
registry.rebind("RemoteObject1", server);
System.out.println("Server Ready..........");
} catch (Exception e) {
e.printStackTrace();
}
}
}
login.java（servlet的客戶端）
import java.io.IOException;
import java.io.PrintWriter;
import java.rmi.Naming;
import java.rmi.NotBoundException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(urlPatterns = {"/login"})
public class login extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//processRequest(request, response);
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
Registration_interface obj = null;
try {
obj = (Registration_interface) (Naming.lookup("//localhost:127/RemoteObject1"));
} catch (NotBoundException e) {
e.printStackTrace();
}
String User = request.getParameter("User").toString();
String Pass = request.getParameter("Pass").toString();
String a = obj.login(User, Pass);
out.println("<u><b> You completed!!!!!!!!!!!!!!</b></u>" + a);
//out.println("<include>register.jsp<include>");
} finally {
out.close();
}
}
private void processRequest(HttpServletRequest request, HttpServletResponse response) {
throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
}
的login.jsp（與serlet integtated）
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Login Page</title>
</head>
<body>
<form action="login" method="post">
<table>
<tr>
<th>UserName</th>
<td><input type="text" name="User"</td>
</tr>
<tr>
<th>Password</th>
<td><input type="password" name="Pass"</td>
</tr>
<tr>
<th></th>
<td><input type="submit" name="login" value="Login"</td>
</tr>
</table>
</form>
</body>
</html>
你將不得不從編譯器複製/粘貼實際的錯誤信息，並指示在代碼信息涉及的線路。 –