form表单处理

表单数据处理通过request.getParameter（）获取指定字段内容，通过request.getParameterValues(）方式获取前端多个值以数组形式存储。
表单代码如下：

<!DOCTYPE html>
<html>
  <head>
    <title>用户注册</title>
    
    <meta name="keywords" content="keyword1,keyword2,keyword3">
    <meta name="description" content="this is my page">
    <meta name="content-type" content="text/html; charset=UTF-8">
    
    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

  </head>
  
  <body>
    <form name="user" id="f1" action="servlet/userRegedit" method="post">
      <table>
        <tr>
          <td>user name:</td>
          <td><input type="text" name="username" id="login"></td>
        </tr>
        <tr>
          <td>Password:</td>
          <td><input type="password" name="password" id="password"></td>
        </tr> 
        <tr>
            <td>
                <input type="radio" name="sex" value="1">男
                <input type="radio" name="sex" value="2">女
            </td>
        </tr>
        <tr>
            <td>
                <input type="checkbox" name="ah" value="1">运动
                <input type="checkbox" name="ah" value="2">玩
            </td>
        </tr>
         <tr>
            <td>
                <select name="zw">
                    <option value="java">java</option>
                    <option value="php">php</option>
                    <option value="python">python</option>
                </select>
            </td>
        </tr>
         <tr>
            <td>
                <textarea rows="20" cols="30" name="bz"></textarea>
            </td>
        </tr>
        <tr>
          <td colspan="2"><input type="submit"></td>
        </tr>
      </table>
    </form>
  </body>
</html>

servlet代码如下：

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

        //获取用户输入表单
        String name = request.getParameter("username");
        String password = request.getParameter("password");
        String sex = request.getParameter("sex");
        String[] hobby = request.getParameterValues("ah");
        String gw = request.getParameter("zw");
        String memo = request.getParameter("bz");
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
        out.println("<HTML>");
        out.println("  <HEAD><TITLE>A Servlet Form</TITLE></HEAD>");
        out.println("  <BODY>");
        out.print("    This is ");
        out.println(name);
        out.println(password);
        out.println(sex);
        for(String x:hobby){
            out.println(x);
        }
        out.println(gw);
        out.println(memo);
        out.print(this.getClass());
        out.println(", using the GET method");
        out.println("  </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();
    }

可以将前台输入所有内容读入并进行处理。

form表单处理

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