通过WEB服务器访问MYSQL，并且数据同步到android SQLite数据库

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.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">
	
	<servlet>
		<servlet-name>LoginServlet</servlet-name>
		<servlet-class>com.amaker.servlet.LoginServlet</servlet-class>
	</servlet>
	
	<servlet-mapping>
		<servlet-name>UpdateMenuServlet</servlet-name>
		<url-pattern>/servlet/UpdateMenuServlet</url-pattern>
	</servlet-mapping></web-app>

<span style="FONT-SIZE: 18px">driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/wirelessorder_db?useUnicode=true&characterEncoding=utf-8
username=root
password=123</span>

package com.amaker.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;

/**
 * 
 * @author BlackhorseMary 

*/
public class DBUtil {
	
	/*
	 * 关闭数据库连接
	 */
	public void closeConn(Connection conn){
		try {
			conn.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	/*
	 * 打开数据库连接
	 */
	public Connection openConnection() {
		Properties prop = new Properties();
		String driver = null;
		String url = null;
		String username = null;
		String password = null;

		try {
			prop.load(this.getClass().getClassLoader().getResourceAsStream(
					"DBConfig.properties"));

			driver = prop.getProperty("driver");
			url = prop.getProperty("url");
			username = prop.getProperty("username");
			password = prop.getProperty("password");
			
			Class.forName(driver);
			return DriverManager.getConnection(url, username, password);
		} catch (Exception e) {
			e.printStackTrace();
		}

		return null;
	}

}

package com.amaker.entity;

public class Menu {
	private int id;
	private int price;
	private int typeId;
	private String name;
	private String pic;
	private String remark;
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPic() {
		return pic;
	}
	public void setPic(String pic) {
		this.pic = pic;
	}
	public int getPrice() {
		return price;
	}
	public void setPrice(int price) {
		this.price = price;
	}
	public String getRemark() {
		return remark;
	}
	public void setRemark(String remark) {
		this.remark = remark;
	}
	public int getTypeId() {
		return typeId;
	}
	public void setTypeId(int typeId) {
		this.typeId = typeId;
	}
	
}

/**
 * @author BlackhorseMary
 *	完成更新SQLite数据功能
 */
public class Update {
	// 获得菜单列表
	public List<menu> getMenuList() {
		// 查询SQL语句
		String sql =" select id,typeId,price,name,pic,remark from MenuTbl ";
		// 数据库连接工具类
		DBUtil util = new DBUtil();
		// 获得连接
		Connection conn = util.openConnection();
		try {
			// 获得预定义语句
			Statement pstmt = conn.createStatement();
			// 执行查询
			ResultSet rs = pstmt.executeQuery(sql);
			// 判断订单详细
			List<menu> list = new ArrayList<menu>();
			while (rs.next()) {
				// 获得菜单信息
				
				int id = rs.getInt(1);
				int typeId = rs.getInt(2);
				int price = rs.getInt(3);
				String name = rs.getString(4);
				String pic = rs.getString(5);
				String remark = rs.getString(6);
				
				Menu m = new Menu();
				m.setId(id);
				m.setName(name);
				m.setPic(pic);
				m.setPrice(price);
				m.setRemark(remark);
				m.setTypeId(typeId);
				
				list.add(m);
			}
			return list;
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			util.closeConn(conn);
		}
		return null;
	}
	
}</menu>
</menu>
</menu>