HttpServletRequest getParameter返回null

来源：互联网发布：汽车改装软件下载编辑：程序博客网时间：2024/06/13 08:32

环境:win7 64位, Eclipse Java EE Mars Release (4.5.0)

新学习jsp，从http://www.cnblogs.com/coder2012/p/3389979.html学习一简单教程，结果悲剧了

出错部分jsp代码：

<form method="post" action="hello.do">    Select:<br>    <select>        <option>yes        <option>no    </select>    <center>        <input type="submit">    </center></form>

出错部分java代码：

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        response.setContentType("text/html");        PrintWriter out = response.getWriter();        String c = request.getParameter("select");        if(c.equals("yes"))            out.print("Welcome!");        else            out.print("I don't like you!");    }

上面代码中request.getParameter获取的值为null,查了半天，原来getParameter只能获取有name属性的控件值

改成

本来就是新手，还被教程坑了

参考：

http://zhidao.baidu.com/link?url=RYdDnZPbOppMEZ725EBe197lSBB_2aqauBDOMtutkH555R7cnpB939RBK6AfS7uE0PUqm0fSJ3ZloKLgY0OE9q

http://www.cnblogs.com/coder2012/p/3389979.html

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