我正在学习Java Servlets，并在一个页面和一个页面中实现了一个简单的注册表单。登录表单在另一页，
我正在使用Ajax和JQuery来处理表单验证和提交。
当提交表单时，我的两个页面都使用POST方法分别与RegisterServlet.java和LoginServlet.java进行通信。
我正在使用最新版本的Apache Tomcat，
每当我尝试在我的登录表单页面中提供一个注册表单页面的链接时，它会被注册表单页面的Servlet解释为获取请求，显示给我这个错误：
HTTP状态405 - 此URL不支持HTTP方法GET
我甚至尝试在RegisterServlet.java中设置一个空白的doGet方法，但是只要从登录表单页面点击链接，它就会返回一个空白页面，
如何提供使用POST方法处理表单请求的Registeration Form页面的链接！
我的代码： 注册表单页面（Register.html）：
`<html>
<head>
<script src="jquery-2.1.3.js"></script>
<script src="validatereg.js">
</script>
</head>
<body>
<form name="regform" id="regform">
<b>Hi Register</b><br><br>
First Name:<input type="text" name="firstname" id="firstname"><br><br>
Last Name:<input type="text" name="lastname" id="lastname"><br><br>
Username:<input type="text" name="username" id="username">
<br><br>
Password: <input type="password" name="password" id="password"><br><br>
Re-Enter Password:<input type="password" name="repassword" id="repassword"><br><br>
State:<select id="stateinfo">
<option value="none">Select State</option>
<option value="Andaman and Nicobar Islands">Andaman and Nicobar Islands</option>
<option value="Andhra Pradesh">Andhra Pradesh</option>
<option value="Arunachal Pradesh">Arunachal Pradesh</option>
</select><br><br>
<input type="submit" value="Log In" >
</form>
<div id="msg"></div>
<div id="contentbutton"></div>
</body>
</html>`
注册表单页面JS代码（validatereg.js）：
$(document).ready(function() {
$.post('Login', "username=&password=", giveLoginResponse);
$('#submitform').submit(function() {
var username = $('#username').val();
var password = $('#password').val();
var pattern = /^(?=.*[0-9])(?=.*[!@#$%^&*()_+/-])[a-zA-Z0-9!@#$%^&*()_+/-]{8,}$/;
var isCorrect = pattern.test(password);
$('#iderror').html("");
$('#paserror').html("");
if (username === '') {
$('#iderror').html("<b>Please Enter a Username!</b>");
return false;
} else if (password === '') {
$('#paserror').html("<b>Please Enter a Password</b>.");
return false;
} else if (username.length < 6) {
$('#iderror').html("Invalid Username");
return false;
} else if (isCorrect === false) {
$('#paserror').html("Invalid Password.");
return false;
} else {
var formData = $('#submitform').serialize();
$.post('Login', formData, giveLoginResponse);
return false;
}
});
$('#contentbutton').on("click", '#LogoutButton', function() {
$.post('Logout', "", giveLogoutResponse);
return false;
});
function giveLoginResponse(data) {
$('#msg').html(data);
if (data === 'Successfully Logged in!') {
$('#submitform')[0].reset();
$('#submitform').hide();
$('#contentbutton').html('<br><input type="button" value="Logout" id=LogoutButton>');
}
}
function giveLogoutResponse(data) {
if (data === 'Successfully Logged Out!') {
$('#LogoutButton').hide();
$('#submitform').show();
$('#msg').html(data);
setTimeout(function() {
$('#msg').html('');
}, 10000);
}
}
$('#regform').submit(function() {
var firstname = $('#firstname').val();
var lastname = $('#lastname').val();
var username = $('#username').val();
var password = $('#password').val();
var repassword = $('#repassword').val();
var state = $('#stateinfo').val();
var pattern = /^(?=.*[0-9])(?=.*[!@#$%^&*()_+/-])[a-zA-Z0-9!@#$%^&*()_+/-]{8,}$/;
var isCorrect = pattern.test(password);
if (firstname === '' || lastname === '' || username === '' || password === '' || repassword === '' || state === 'none') {
$('#msg').html("All Field are Mandatory.Please Enter Details in all fields.");
return false;
} else if (username.length < 6) {
$('#msg').html("Length of username should be atleast 6!");
return false;
} else if (!(password === repassword)) {
$('#msg').html("These Passwords don't match.Try Again? <br> Rules: Password length should be of minimum 8 chracters and must include 1 special character and 1 number!");
return false;
} else if (isCorrect === false) {
$('#msg').html("Incorrect Password Format! <br>Rules: Password length should be of minimum 8 characters and must include 1 special character and 1 number!");
return false;
} else {
var regData = $('#regform').serialize();
$.post('Register', regData, giveRegResponse);
return false;
}
});
function giveRegResponse(data) {
if (data === 'false') {
$('#msg').html("Username already Exist! Please Select a different username!");
} else if (data === '' {
$('#regform').hide();
$('#msg').html("Successfully Created Account!");
}
}
});
RegisterServlet.java
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import java.io.PrintWriter;
import java.io.IOException;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* @author VJ
*/
public class RegisterServlet extends HttpServlet {
DBHandle regdb = new DBHandle();
public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
PrintWriter write = response.getWriter();
response.setContentType("text/html");
String username = request.getParameter("username");
String password = request.getParameter("password");
String fullname = request.getParameter("firstname") + " " + request.getParameter("lastname");
try {
if (regdb.RegisterUser(username, password, fullname)) {
Cookie regCookie = new Cookie("ECI_User", regdb.GenerateUserUID(username));
regCookie.setMaxAge(60 * 60 * 24);
regCookie.setPath("/");
response.addCookie(regCookie);
request.getRequestDispatcher("Login").forward(request, response);
} else {
write.print("false");
}
} catch (SQLException ex) {
System.out.println("Exception in RegisterServlet doPost Method:" + ex);
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
}
}
登录表单页面（index.html）：
<html>
<head>
<script src="jquery-2.1.3.js"></script>
<script src="validate.js">
</script>
</head>
<body>
Not Registered Yet?<a href="Register"> Click Here! </a>
<form name="loginform"method="post" action="" id="submitform">
<b>Hi Please Login!</b><br><br>
Username:<input type="text" name="username" id="username"><div id="iderror"></div><br><br>
Password: <input type="password" name="password" id="password">
<div id="paserror"></div><br><br>
<input type="submit" value="Log In" >
</form>
<div id="msg"></div>
<div id="contentbutton"></div>
</body>
</html>
登录表单JS代码（validate.js）：
$(document).ready(function() {
$('#regform').submit(function() {
var firstname = $('#firstname').val();
var lastname = $('#lastname').val();
var username = $('#username').val();
var password = $('#password').val();
var repassword = $('#repassword').val();
var state = $('#stateinfo').val();
var pattern = /^(?=.*[0-9])(?=.*[!@#$%^&*()_+/-])[a-zA-Z0-9!@#$%^&*()_+/-]{8,}$/;
var isCorrect = pattern.test(password);
if (firstname === '' || lastname === '' || username === '' || password === '' || repassword === '' || state === 'none') {
$('#msg').html("All Field are Mandatory.Please Enter Details in all fields.");
return false;
} else if (username.length < 6) {
$('#msg').html("Length of username should be atleast 6!");
return false;
} else if (!(password === repassword)) {
$('#msg').html("These Passwords don't match.Try Again? <br> Rules: Password length should be of minimum 8 chracters and must include 1 special character and 1 number!");
return false;
} else if (isCorrect === false) {
$('#msg').html("Incorrect Password Format! <br>Rules: Password length should be of minimum 8 characters and must include 1 special character and 1 number!");
return false;
} else {
var regData = $('#regform').serialize();
$.post('Register', regData, giveRegResponse);
return false;
}
});
function giveRegResponse(data) {
if (data === 'false') {
$('#msg').html("Username already Exist! Please Select a different username!");
} else if (data === '' {
$('#regform').hide();
$('#msg').html("Successfully Created Account!");
}
}
});
LoginServlet.java
import javax.servlet.RequestDispatcher;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.ServletException;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import javax.servlet.http.Cookie;
/**
*
* @author VJ
*/
public class LoginServlet extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter write = response.getWriter();
DBHandle CheckDB = new DBHandle();
String username = request.getParameter("username");
String password = request.getParameter("password");
Cookie[] oldCookie = request.getCookies();
try {
if (oldCookie != null) {
for (Cookie checkData : oldCookie) {
if (checkData.getName().equals("ECI_User")) {
if (!CheckDB.getUserFromUID(checkData.getValue()).equals("null")) {
write.print("Successfully Logged in!");
} else {
checkData.setMaxAge(0);
checkData.setPath("/");
response.addCookie(checkData);
}
}
}
} else if (CheckDB.LoginUser(username, password)) {
Cookie newcookie = new Cookie("ECI_User", CheckDB.GenerateUserUID(username));
newcookie.setMaxAge(60 * 60 * 24);
newcookie.setPath("/");
response.addCookie(newcookie);
write.print("Successfully Logged in!");
} else if (!username.equals("") && !password.equals("")) {
write.print("Sorry! Username/Password is Incorrect");
}
} catch (SQLException sqle) {
System.out.println("Exception in doPost Method of LoginServlet : " + sqle);
}
}
}
的web.xml
<web-app>
<servlet>
<servlet-name>LoginPage</servlet-name>
<servlet-class>LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<http-method>POST</http-method>
<servlet-name>LoginPage</servlet-name>
<url-pattern>/Login</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>LogoutPage</servlet-name>
<servlet-class>LogoutServlet</servlet-class>
</servlet>
<servlet-mapping>
<http-method>POST</http-method>
<servlet-name>LogoutPage</servlet-name>
<url-pattern>/Logout</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>RegisterPage</servlet-name>
<servlet-class>RegisterServlet</servlet-class>
</servlet>
<servlet-mapping>
<http-method>POST</http-method>
<servlet-name>RegisterPage</servlet-name>
<url-pattern>/Register</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>Register.html</welcome-file>
</welcome-file-list>
</web-app>
答案 0 :(得分：0)
好的，所以我意识到自己的错误，真的很傻。在我的登录表单页面的注册表单页面的链接中我没有添加扩展名“.html”，因此tomcat试图找到一个Servlet名称注册而不是Register.html的链接