Question

我在Tomcat 7上部署了我的简单java Web应用程序，但是出了点问题。

当我使用方法POST将表单提交给servlet时，tomcat实际上会按预期调用doGet()而非doPost()。这是我的代码：

的index.html：

<html>
    <body>
        <form action="http://localhost:8084/authentication" method="post">
            <input type="text" name="username">
            <input type="password" name="password">
            <input type="submit">
        </form>
    </body>
</html>

AuthenticationServlet.java：

public class AuthenticationServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request,
                          HttpServletResponse response)
            throws ServletException, IOException {
        response.sendError(405, "Method GET is not allowed");
    }

    @Override
    protected void doPost(HttpServletRequest request,
                          HttpServletResponse response)
            throws ServletException, IOException {
        // unreachable
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        if (username == null || password == null) {
            response.sendError(400, "username and password are required");
            return;
        }

        ...
    }
}

的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app 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_3_0.xsd"
 version="3.0">
    <filter>
        <filter-name>encoding</filter-name>
        <filter-class>foo.bar.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <servlet>
        <servlet-name>authentication</servlet-name>
        <servlet-class>foo.bar.AuthenticationServlet</servlet-class>
    </servlet>
    <filter-mapping>
        <filter-name>encoding</filter-name>
        <servlet-name>authentication</servlet-name>
    </filter-mapping>
    <servlet-mapping>
        <servlet-name>authentication</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

稍后，我将doGet()更改为

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

虽然我在表单中输入用户名和密码，但用户名和密码为null。

Answer 1

问题解决了:)。谢谢你的评论。

我使用Netbeans部署我的Web应用程序，它会自动部署我过去为我开发的其他无关应用程序。在我将Maven命令mvn clean应用于所有这些不相关的Web项目后，它按预期工作。

发布表单时tomcat发生意外结果

1 个答案: