1.

public class OneServlet extends HttpServlet{

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub

PrintWriter out = resp.getWriter();
out.println("{\"statusCode\":\"301\", \"message\":\"Session Timeout! Please re-sign in!\"}");
}

}

2.

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
id="WebApp_ID"
version="3.0">

<servlet>
<servlet-name>OneServlet</servlet-name>
<servlet-class>com.lesta.test.OneServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>OneServlet</servlet-name>
<url-pattern>/OneServlet</url-pattern>
</servlet-mapping>
</web-app>

3.

<form method="post" action="/OneServlet" class="pageForm required-validate" onsubmit="return validateCallback(this);">

<div class="pageFormContent" layoutH="56">

<p>

<label>E-Mail：</label>

<input class="required email" name="email" type="text" size="30" />

</p>

<p>

<label>客户名称：</label>

<input class="required" name="name" type="text" size="30" />

</p>

</div>

<div class="formBar">

<ul>

<li>

<div class="buttonActive"><div class="buttonContent"><button type="submit">保存</button></div></div>

</li>

<li>

<div class="button"><div class="buttonContent"><button type="Button" class="close">取消</button></div></div>

</li>

</ul>

</div>

</form>

老是请求servlet报404 也不知道为什么