我已将我的 java 项目附加到 java web 应用程序的源包中。我制作了一个名为“System”的 servlet，我想做的是为我的后端应用程序创建一个前端。
但是我遇到的问题是，在我的“processregister”表单中，我无法让它重新定向到提交操作上的第二个“processreadregister”操作。因此，当用户填写表格时，我可以获取信息，然后调用我的集合让我的后端进行注册，显然我可以看到它是否成功。
不习惯 servlet，所以我可能会完全错误并调用错误的操作。
代码示例：
package HPC;
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
import hpcproject.HPCSystem;
import hpcproject.JobRequest;
import hpcproject.User;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author Kieran
*/
@WebServlet(name = "System", urlPatterns = {"/System"})
public class System extends HttpServlet {
HPCSystem System = new HPCSystem();
public enum OPCode {
// specify enums to methods
BOOKING, READBOOKING, NOTHING;
public static System.OPCode resolve(String str) {
try {
return valueOf(str.toUpperCase());
} catch (Exception e) {
return NOTHING;
}
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
switch (System.OPCode.resolve(request.getParameter("action"))) {
case REGISTER:
processRegister(request, response);
break;
case READREGISTER:
processReadRegister(request, response);
break;
}
}
protected void processRegister(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
User testUser = new User();
System.RegisterUserWithSystem(testUser);
// point where it goes
out.println("<html>");
out.println("<head>");
out.println("<title>Register Process</title>");
out.println("</head>");
out.println("<body>");
out.println("<FORM NAME ='register' ACTION ='readregister' METHOD='POST>'");
// SORT OUT ISSUE HERE!!!
out.println("<input type='hidden' name='action' value='readregister'>");
out.println("<br>");
out.println("Login ID:");
out.println("<INPUT TYPE='TEXT' name='user'>");
out.println("<br>");
out.println("Password:");
out.println("<INPUT TYPE='PASSWORD' name='password'>");
out.println("<br>");
out.println("Department:");
out.println("<INPUT TYPE='TEXT' name='department'>");
out.println("<br>");
out.println("Email:");
out.println("<INPUT TYPE='TEXT' name='email'>");
out.println("<br>");
out.println("First name:");
out.println("<INPUT TYPE='TEXT' name='fname'>");
out.println("<br>");
out.println("Last name:");
out.println("<INPUT TYPE='TEXT' name='lname'>");
out.println("<br>");
out.println("<INPUT TYPE='SUBMIT' VALUE='Submit' onclick=setType('readregister') >");
out.println("</FORM>");
out.println("</body>");
out.println("</html>");
}
protected void processReadRegister(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out = response.getWriter();
User testUser = new User();
String id = request.getParameter("user");
String password = request.getParameter("password");
String department = request.getParameter("department");
String email = request.getParameter("email");
String myfirstname = request.getParameter("fname");
String mylastname = request.getParameter("lname");
testUser.setUserID(id);
testUser.setUserPassword(password);
testUser.setUseDepartment(department);
testUser.setUserEmail(email);
testUser.setUserFname(myfirstname);
testUser.setUserLname(mylastname);
if (System.RegisterUserWithSystem(testUser)) {
out.println("User added successfully");
} else {
out.println("Failed to add user");
}
out.println("<html>");
out.println("<head>");
out.println("<title>Charts</title>");
out.println("</head>");
out.println("<body>");
out.println("<p>View Charts</p>");
out.println("</body>");
out.println("</html>");
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}