WAP建站入门教程 (11)

请先看一个简单的PHP例子：

<?php
header ("Content-Type: text/vnd.wap.wml");
echo "<?xml version=\"1.0\"?>\n"
?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN" http://www.wapforum.org/DTD/wml_1.1.xml">
<!-- Source Generated by WML Deck Decoder -->
<wml>
<card id=”main” title=”PHP WML”>
    <p>
        <?php
            echo "hello，world\n";
        ?>
    </p>
</card>
</wml>

    启动Nokia WAP Toolkit，在“Go”下选择“Open Location”，并输入URL地址（图2-30）：

图 2-30 输入URL地址

    使用Nokia WAP Toolkit测试结果显示如下（图2-31）：

图 2-31 测试结果显示

    下面演示的是如何使用WML与PHP实现动态交互。演示的内容是：用户在WML页面中输入用户名和密码，然后提交给服务器端；服务器端将动态生成WML显示用户的输入，并返还到客户端。整个演示包括登录页面logon.wml和服务端脚本程序logon.php。

logon.wml

<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN" "http://www.wapforum.org/DTD/wml_1.1.xml">
<!-- Source Generated by WML Deck Decoder -->
<wml>
<card>
    <p>
        User:<input name="user" value="admin"/>
        Password:<input name="password" value="whoami"/>
    </p>
    <do type="accept">
        <go href="http://127.0.0.1/php4/logon.php">
            <postfield name="user" value=" $(user)"/>
            <postfield name="password" value=" $(password)"/>
        </go>
    </do>
</card>
</wml>

logon.php

<?php
    header ("Content-Type: text/vnd.wap.wml");
    echo "<?xml version=\"1.0\"?>\n"
?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN" "http://www.wapforum.org/DTD/wml_1.1.xml">
<!-- Source Generated by WML Deck Decoder -->
<wml>
<card>
    <p>
        <?php
            echo "Hello !  $(user) <br/>\n";
            echo "Password is  $(password) <br/>\n";
        ?>
    </p>
</card>
</wml>

    启动Nokia WAP Toolkit，在“Go”下选择“Open Location”，并输入URL地址（图2-32）：

图 2-32 输入URL地址

    在模拟器上出现（图2-33）：

图 2-33 登录界面

    在确定输入后（图2-34）：

图 2-34 从服务器端返回的处理结果

    下面有两个简单的例子程序，先看第一个简单例子：

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class WapServlet extends HttpServlet
{
    protected void service(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, java.io.IOException
    {
        response.setContentType("text/vnd.wap.wml");
        PrintWriter out = response.getWriter();

        xmlHeader(out);
        out.println("<wml>");
        out.println("<card title = \"JavaTest\">");
        out.println("<p>Hello! This comes from a servlet!</p>");
        out.println("</card>");
        out.println("</wml>");
    }

    public void xmlHeader(PrintWriter out)
    {
        out.println("<?xml version=\"1.0\"?>");
        out.println("<!DOCTYPE wml PUBLIC \"-//WAPFORUM//DTD WML 1.1//EN\" "+"\"http://www.wapforum.org/DTD/wml_1.1.xml\">");
    }
}

    下面是Nokia提供的一个例子程序：

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
/*
* HelloWorldServlet - a very simple servlet
*/

public class HelloWorld extends HttpServlet
{
    String m_text;

    // the initialization parameter is read during
    // the initialization of the servlet
    public void init(ServletConfig config) throws ServletException
    {
        super.init(config);
        m_text = config.getInitParameter("text");
        if (m_text == null)
        {
            m_text = "This is a simple test servlet.";
        }
    }

    public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException, ServletException
    {
        PrintWriter out = response.getWriter();
        out.println("<?xml version=\"1.0\"?>");
        out.println("<!DOCTYPE wml PUBLIC \"-//WAPFORUM//DTD WML1.1//EN\"\"http://www.wapforum.org/DTD/wml_1.1.xml\">");
        out.println("<wml>");
        out.println("<card id=\"card1\" title=\"Hello World\">");
        out.println("<p>");

        out.println(m_text);
        out.println("</p>");
        out.println("</card>");
        out.println("</wml>");

        // Remember to close the out object
        out.close();
    }

    public String getServletInfo()
    {
        return "The simple HelloWorld servlet.";
    }
}