Servlet響應未顯示在網頁上
[英]Servlet response is not displaying on webpage
問題描述
嗨，我是java編碼的新手，我試圖在eclipse中創建動態網頁。 這是我的demoServlet.java代碼
import java.io.IOException;
import java.io.PrintWriter;
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("/demoServlet")
public class demoServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public demoServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out= response.getWriter();
out.println("<!DOCTYPE html PUBLIC \''>");
out.println("<html>");
out.println("<head>");
out.println("<script language=\'JavaScript\'>");
RequestDispatcher rd= request.getRequestDispatcher("/WEB-INF/javascript/Validate.js");
rd.include(request, response);
out.println("</script>");
out.println("</head>");
out.println("<body>");
out.println("<form action=\'/myWebprj/Success.jsp onSubmit=\'return Validateusername(this.username.value)\'>");
out.println("UserName: <input type=\'text\' name=\'username\'>");
out.println("<input type=\'submit\' value=\'Submit\'>");
out.println("</form>");
out.println("</body>");
out.println("</html>");
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
這是我的JSP頁面
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>My First jsp page in servlets</title>
</head>
<body>
Its Successfully completed
</body>
</html>
這是我的javascript頁面
function Validateusername(username)
{
var returnValue=true;
if(username=""){
alert("Enter username is empty");
returnValue=false;
}
return returnValue;
}
當我試圖進入SUBMIT按鈕時，它顯示錯誤
HTTP Status 404 - /myWebprj/Success.jsp%20onSubmit=
--------------------------------------------------------------------------------
type Status report
message /myWebprj/Success.jsp%20onSubmit=
description The requested resource is not available.
Can any one help me out . whats is the error in the code...?
3 個解決方案
解決方案1
0 已采納 2015-05-05 04:27:52
您是否有可能以某種方式使用POST而不是GET訪問您的demoServlet servlet？ 這將解釋您的錯誤消息。 請檢查您的JavaScript控制台以確定它是否正在使用GET 。
另外，請將您的doPost()方法修改為以下內容：
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
如果這解決了錯誤，那么我們就解決了問題。
解決方案2
0 2015-05-05 06:18:42
這適合我！ 我只從onsubmit事件屬性中刪除了return關鍵字。 我也修改了一些代碼以正確地將用戶名分配給javascript函數。
package test; import java.io.IOException; import java.io.PrintWriter; 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("/demoServlet") public class demoServlet extends HttpServlet { private static final long serialVersionUID = 1L; public demoServlet() { super(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out= response.getWriter(); String username = request.getParameter("username"); out.println("<!DOCTYPE html PUBLIC \\''>"); out.println("<html>"); out.println("<head>"); out.println("<script language=\\'JavaScript\\'>"); RequestDispatcher rd= request.getRequestDispatcher("/WEB-INF/javascript/Validate.js"); rd.include(request, response); out.println("</script>"); out.println("</head>"); out.println("<body>"); /* onSubmit should call only 'Validateusername()' so the the 'return' keyword has been removed */ out.println("<form action=\\'/Test/Success.jsp\\' onSubmit=\\'Validateusername(" + username + ")\\'>"); out.println("UserName: <input type=\\'text\\' name=\\'username\\'>"); out.println("<input type=\\'submit\\' value=\\'Submit\\'>"); out.println("</form>"); out.println("</body>"); out.println("</html>"); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub } }
function Validateusername(username) { var returnValue=true; if(username == undefined || username == null || username == ""){ alert("Enter username is empty"); returnValue=false; } return returnValue; }
解決方案3
0 2015-05-05 07:17:49
你的servlet代碼看起來很好。 您需要進行的唯一更改是在Validate.js文件中。 將用戶名驗證為空時，您使用了“=”：
if(username=""){ // your code }
相反，你使用“==”，它工作正常。
if(username==""){ // your code }
服務器返回HTTP響應代碼：403表示URL：Iam在JEditorPane上顯示網頁
[英]Server returned HTTP response code: 403 for URL: Iam displaying webpage on JEditorPane
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