java实现的二级联动菜单效果

java实现的二级联动菜单效果

本文实例讲述了java实现的二级联动菜单效果。分享给大家供大家参考，具体如下：

jsP代码：

<%@ page language="java" pageEncoding="UTF-8"%>

二级联动示例

<!–第一个下拉菜单–>

请选择

北京

天津

山东

<!–第二个下拉菜单–>

请选择

Java代码：

package com;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/***

*

* @author zdw

*

*/

public class SelectServlet extends HttpServlet

{

private static final long serialVersionUID = 1L;

public SelectServlet()

{

super();

}

public void destroy()

{

super.destroy();

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException

{

// response.setCharacterEncoding("GBK");

response.setContentType("text/xml");

response.setHeader("Cache-Control", "no-cache");

request.setCharacterEncoding("GBK");

response.setCharacterEncoding("UTF-8");

String targetId = request.getParameter("id").toString();

System.out.println(targetId);

// 获得请求中参数为id的值

String xml_start = "";

String xml_end = "";

String xml = "";

if (targetId.equalsIgnoreCase("0"))

{

xml = "0请选择";

} else if (targetId.equalsIgnoreCase("1"))

{

xml = "&lthttp://;select>1昌平";

xml += "2丰台";

xml += "3海淀";

xml += "4朝阳";

} else if (targetId.equalsIgnoreCase("2"))

{

xml = "1塘沽区";

xml += "2汉沽区";

xml += "3大港区";

xml += "4东丽区";

} else

{// 如果是3,则返回下面的字符

xml = "1济南";

xml += "2青岛";

xml += "3淄博";

xml += "4枣庄";

}

String last_xml = xml_start + xml + xml_end;

response.getWriter().write(last_xml);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException

{

doGet(request, response);

}

public void init() throws ServleUBCKyIrBLqtException

{

}

}

XML代码：

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee

http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

SelectServlet

com.SelectServlet

SelectServlet

/select

index.jsp

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee

http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

SelectServlet

com.SelectServlet

SelectServlet

/select

index.jsp

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希望本文所述对大家java程序设计有所帮助。

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