只需将jsp修改为此：
我有JSP页面-
<%@ 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>和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); } }首先，我想将值从JSP传递到Servlet。接下来，我要建立一个条件分支最后，我要显示jps屏幕
当我单击标签（Sample1，Sample2，Sample4）时，出现404错误。错误消息是“ / action / http://localhost:8080/action/jsp/registerForm.jsp”（如果我单击“ sample1 and 2”）。当我单击Sample3时，它起作用。我指定的PATH是否错误？请教我。
我使用...Eclipse2020雄猫9Java EE
我有JSP页面-
只需将jsp修改为此：
<%@ 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>
</body>
</html>
这将起作用。
我将jsp修改为
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);
}
并将servlet修改为
<body>
<a href="http://localhost:8080/action/RegisterUser">Sample1</a>
<a href="http://localhost:8080/action/RegisterUser?action=done">Sample2</a>
</body>
将文件位置更改为https://gyazo.com/e79a8d083e5cc0c4ebb0d398e00a17ad，它起作用。感谢大家的帮助]
只需将jsp修改为此：
我将jsp修改为