Servlet中无法实现跳转了

今天刚开始学习jQuery EasyUI, 做了个简单的登录窗口, 用户和密码两个字段, 访问的是Servlet, 可以在后台打印出两个字段的值,简单的验证了一下值然后跳转, 结果浏览器无反应

页面代码如下：

<div class="easyui-panel" title="用户登录" style="width:300px">
			<div style="padding:10px 0 0 40px">
				<form id="ff" method="post" action="http://localhost:8080/easyui/UserLoginServlet">
					<table>
						<tr>
							<td>
								用户:
							</td>
							<td>
								<input class="ww" type="text" name="name"></input>
							</td>
						</tr>
						<tr>
							<td>
								密码:
							</td>
							<td>
								<input class="ww" type="password" name="password"></input>
							</td>
						</tr>
					</table>
				</form>
			</div>
			<div style="text-align:center;padding:5px">
				<a href="javascript:void(0)" class="easyui-linkbutton"
					onclick="submitForm()">登录</a>
				<a href="javascript:void(0)" class="easyui-linkbutton"
					onclick="clearForm()">取消</a>
			</div>
		</div>
		<script>
			function submitForm(){
				$(""#ff"").form(""submit"");
			}
			function clearForm(){
				$(""#ff"").form(""clear"");
			}
		</script>

后台Servlet如下：

public class UserLoginServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		this.doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		request.setCharacterEncoding("UTF-8");

		String name = request.getParameter("name");
		String password = request.getParameter("password");

		System.out.println("用户: " + name);
		System.out.println("密码: " + password);

		if("admin".equals(name) && "123".equals(password)) {
			request.getRequestDispatcher("/success.html").forward(request, response);
		} else {
			response.sendRedirect("http://localhost:8080/easyui/fail.html");
		}
	}
}

工程web.xml如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  
  <servlet>
    <servlet-name>UserLoginServlet</servlet-name>
    <servlet-class>com.wisher.easyui.servlet.UserLoginServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>UserLoginServlet</servlet-name>
    <url-pattern>/UserLoginServlet</url-pattern>
  </servlet-mapping>
  
  
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
  </welcome-file-list>
</web-app>

success.html和fail.html都是创建在WebRoot目录下面