Is there any better way to pass the value from jsp to the servlet using <a href>
Question
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<a href="http://localhost:8080/action/RegisterUser">Sample1</a>
<a href="http://localhost:8080/action/RegisterUser?action=done">Sample2</a>
<a href="http://localhost:8080/action/jsp/registerDone.jsp">Sample3</a>
<a href="/action/WebContent/jsp/registerForm.jsp">Sample4</a>
</body>
</html>
And servlet -
package example;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
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("/RegisterUser")
public class RegisterUser extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String forwardPath = null;
String action = request.getParameter("action");
if(action == null) {
forwardPath = "/action/WebContent/jsp/registerForm.jsp";
}
if(action != null && action.equals("done")) {
forwardPath = "/action/WebContent/jsp/registerDone.jsp";
}
RequestDispatcher dispatcher = request.getRequestDispatcher(forwardPath);
dispatcher.forward(request, response);
}
}
First, I want to pass a value from JSP to the Servlet. Next, I want to make a conditional branch Finally, I want to display the jps screen
When I click on the tag(Sample1,Sample2,Sample4), I get a 404 error. The error message is "/action/ http://localhost:8080/action/jsp/registerForm.jsp "(if i click on the "sample1 and 2"). When i click on the Sample3, it work. Is the PATH I specified wrong? Please teach me.
I use... Eclipse2020 tomcat9 Java EE
1 answers
solution1
0 2020-05-21 15:34:06
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<a href="http://localhost:8080/action/RegisterUser">Sample1</a>
<a href="http://localhost:8080/action/RegisterUser?action=done">Sample2</a>
<a href="http://localhost:8080/action/jsp/registerDone.jsp">Sample3</a>
<a href="/action/WebContent/jsp/registerForm.jsp">Sample4</a>
</body>
</html>
And servlet -
package example;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
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("/RegisterUser")
public class RegisterUser extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String forwardPath = null;
String action = request.getParameter("action");
if(action == null) {
forwardPath = "/action/WebContent/jsp/registerForm.jsp";
}
if(action != null && action.equals("done")) {
forwardPath = "/action/WebContent/jsp/registerDone.jsp";
}
RequestDispatcher dispatcher = request.getRequestDispatcher(forwardPath);
dispatcher.forward(request, response);
}
}
First, I want to pass a value from JSP to the Servlet. Next, I want to make a conditional branch Finally, I want to display the jps screen
When I click on the tag(Sample1,Sample2,Sample4), I get a 404 error. The error message is "/action/ http://localhost:8080/action/jsp/registerForm.jsp "(if i click on the "sample1 and 2"). When i click on the Sample3, it work. Is the PATH I specified wrong? Please teach me.
I use... Eclipse2020 tomcat9 Java EE
solution2
0 2020-05-21 17:42:03
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String forwardPath = null;
String action = null;
action = request.getParameter("action");
if(action == null) {
action = "miss";
forwardPath = "registerForm.jsp";
}
if(action.equals("done")) {
forwardPath = "registerDone.jsp";
}
RequestDispatcher dispatcher = request.getRequestDispatcher(forwardPath);
dispatcher.forward(request, response);
}
And modify servlet to
<body>
<a href="http://localhost:8080/action/RegisterUser">Sample1</a>
<a href="http://localhost:8080/action/RegisterUser?action=done">Sample2</a>
</body>
After changing the file location to https://gyazo.com/e79a8d083e5cc0c4ebb0d398e00a17ad , it work. Thanks to everyone for helping me
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