Android平台实现与Apache Tomcat服务器数据交互(MySql数据库)

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需求:Android客户端连接服务器端mysql数据库中的内容

环境部署

        服务器:apache-tomcat-8.5.9

    语言版本:Java 1.8.0_101

    编译环境:Eclipse

                    Android Studio

    调用jar包:httpclient-4.2.5,httpcore-4.2.4 //HttpClient父类

                      mysql-connector-java-5.1.40-bin //用于连接mysql数据库

思路:涉及到服务器端mysql数据库安装、web应用部分开发和Android客户端开发三个部分

步骤:

1、mysql数据库安装

a、先安装mysql-installer-community-5.7.17.0,其中在Setup Type上选择“Server only”,然后记住数据库端口号和账号(例如:root)密码(例如:123456),如下图:

b、安装成功验证。命令行窗口输入密码,然后输入显示所有数据库命令:show databases; 一定要有分号,并按回车。

c、NavicatforMySQL下载及使用。注册,然后连接数据库,输入密码后,能够看到已存在的数据库,可以在其中进行相关数据库和数据表的创建操作。

具体以参考资料中的内容为主

2、web应用部分开发

a、新建servlet,并且配置好web.xml中的相应信息(在WebContent下的WEB-INF文件夹下加入web.xml文件来连接servlet与jsp前端),此外还需在libs中添加mysql-connector-java-5.1.37-bin.jar文件,代码如下:

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 1 package com.Servlet; 2  3 import java.io.IOException; 4 import javax.servlet.ServletException; 5 import javax.servlet.annotation.WebServlet; 6 import javax.servlet.http.HttpServlet; 7 import javax.servlet.http.HttpServletRequest; 8 import javax.servlet.http.HttpServletResponse; 9 10 import java.io.PrintWriter;11 import java.sql.Connection;12 import java.sql.ResultSet;13 import java.sql.Statement;14 import com.DBTool.DBUtil;15 16 @WebServlet("/Servlet")17 public class Login extends HttpServlet {18     private static final long serialVersionUID = 1L;19        20     /**21      * @see HttpServlet#HttpServlet()22      */23     public Login() {24         super();25         // TODO Auto-generated constructor stub26     }27     /**28      * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)29      */30     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {31         // TODO Auto-generated method stub32         response.getWriter().append("Served at: ").append(request.getContextPath());33     }34 35     /**36      * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)37      */38     protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {39         String ID = request.getParameter("ID"); 40         String PW= request.getParameter("PW");41         boolean type=false;42         response.setContentType("text/html; charset=UTF-8");43         PrintWriter out = response.getWriter();44         try45         {46             Connection con=DBUtil.getConnection();47             Statement stmt=con.createStatement();48             //mysql数据库中的数据表,表名叫:demotable ,需要自己预先在数据库中进行创建,包含相应的字段和记录。49             String sql="select * from mysql.demotable where uid="+ID+" and pwd="+PW;50             ResultSet rs=stmt.executeQuery(sql);51             while(rs.next())52             {53                 type=true;54             }55         }56         catch(Exception ex)57         {58             ex.printStackTrace();59         }60         finally61         {62             DBUtil.Close();63             out.print(type);64             out.flush();65             out.close();66         }67     }68 69 }
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web.xml内容如下:

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 1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app id="WebApp_ID" 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"> 3     <display-name>web</display-name> 4     <servlet> 5         <display-name>Login</display-name> 6         <servlet-name>Login</servlet-name> 7         <servlet-class>com.Servlet.Login</servlet-class> 8     </servlet> 9     <servlet-mapping>10         <servlet-name>Login</servlet-name>11         <url-pattern>/Login</url-pattern>12     </servlet-mapping>13     <welcome-file-list>14         <welcome-file>index.html</welcome-file>15         <welcome-file>index.jsp</welcome-file>16     </welcome-file-list>17 </web-app>
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b、前端界面设计(TestPage.jsp)如下:

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 1 <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> 2 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 3 <html> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 6 <title>Insert title here</title> 7 </head> 8 <body> 9 <form id="from1" action="Login" method="post">10 <table>11 <tr><td>用户名</td><td><input type="text"  name="ID"></td></tr>12 <tr><td>密码</td><td><input type="password"  name="PW"></td></tr>13 <tr><td colspan="2" align="center"><input type="submit"  value="登陆"/></td></tr>14 </table>15 </form>16 </body>17 </html>
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c、在java Resources下的src文件夹中新建com.DBTool包,用作数据池来连接数据库,在包中建立DBUtil类实现功能,代码如下: 

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 1 package com.DBTool; 2  3  4 import java.sql.*; 5  6 public class DBUtil { 7     //其中mysql是数据库名称,在mysql57版本的数据库中已经预先新建完成;3306是mysql数据库的端口号。 8     private static String url="jdbc:mysql://localhost:3306/mysql"; 9     //com.mysql.jdbc.Driver是mysql-connector-java-5.1.40中的驱动包路径10     private static String driverClass="com.mysql.jdbc.Driver";11     //mysql的账号和密码是在安装mysql中进行设置的,这里拿来用即可。12     private static String username="root";13     private static String password="123456";14     private static Connection conn;15     //装载驱动16     static{17         try{18             Class.forName(driverClass);19         }20         catch(ClassNotFoundException e){21             e.printStackTrace();22         }23     }24     //获取数据库连接25     public static Connection getConnection(){26         try{27             conn=DriverManager.getConnection(url,username,password);28         }29         catch(SQLException e){30             e.printStackTrace();31         }32         return conn;33     }34     //建立数据库连接35     public static void main(String[] args){36         Connection conn=DBUtil.getConnection();37         if(conn!=null){38             System.out.println("数据库连接成功");39         }40         else{41             System.out.println("数据库连接失败");42         }43     }44     //关闭数据库连接45     public static void Close(){46         if(conn!=null){47             try{48                 conn.close();49             }50             catch(SQLException e){51                 e.printStackTrace();52             }53         }54     }55 }
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 d、运行服务器,测试是否成功搭建。

 3、Android部分开发

仅附上核心部分代码,如下:

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 1 public void SendByHttpClient(final String id, final String pw){   2         new Thread(new Runnable() {   3             @Override   4             public void run() {   5                 try {   6                     HttpClient httpclient=new DefaultHttpClient();   7                     HttpPost httpPost=new HttpPost("http://web应用部署服务器上的IP地址:8080/HttpClientDemo/Login");//服务器地址,指向Servlet   8                     List<NameValuePair> params=new ArrayList<NameValuePair>();//将id和pw装入list   9                     params.add(new BasicNameValuePair("ID",id));  10                     params.add(new BasicNameValuePair("PW",pw));  11                     final UrlEncodedFormEntity entity=new UrlEncodedFormEntity(params,"utf-8");//以UTF-8格式发送  12                     httpPost.setEntity(entity);  13                     HttpResponse httpResponse= httpclient.execute(httpPost);  14                     if(httpResponse.getStatusLine().getStatusCode()==200)//在200毫秒之内接收到返回值  15                     {  16                         HttpEntity entity1=httpResponse.getEntity();  17                         String response=EntityUtils.toString(entity1, "utf-8");//以UTF-8格式解析  18                         Message message=new Message();  19                         message.what=USER_LOGIN;  20                         message.obj=response;  21                         handler.sendMessage(message);使用Message传递消息给线程  22                     }  23                 }  24                 catch (Exception e) {  25                     e.printStackTrace();  26                 }  27             }  28         }).start();  29     }  
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最终,测试结果图,如下:

 

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参考资料:

http://transcoder.tradaquan.com/from=1017649e/bd_page_type=1/ssid=0/uid=0/pu=usm%401%2Csz%401320_2001%2Cta%40iphone_1_9.2_3_601/baiduid=3B77D44CFFB44688FD602EAD8A663022/w=0_10_/t=iphone/l=3/tc?ref=www_iphone&lid=9684581900815139314&order=2&fm=alhm&h5ad=1&srd=1&dict=32&tj=h5_mobile_2_0_10_title&w_qd=IlPT2AEptyoA_ykzv39b7vOxASxPcYSfDwWEKKelwb6TYslhS_&sec=22021&di=4d89010ccd0ca0f7&bdenc=1&tch=124.133.103.675.1.561&nsrc=IlPT2AEptyoA_yixCFOxXnANedT62v3IEQGG_ytK1DK6mlrte4viZQRAUSD8L7qYZpPPtCPQpxkCwnWh_7YskNYWgK&eqid=86668bed7c43800010000003594fbeac&wd=&clk_info=%7B%22srcid%22%3A%221599%22%2C%22tplname%22%3A%22h5_mobile%22%2C%22t%22%3A1498398423079%2C%22sig%22%3A%2242687%22%2C%22xpath%22%3A%22div-a-h3%22%7D

//MySQL数据库安装与配置详解

http://blog.csdn.net/qq_14923661/article/details/50461696   // Android平台实现与Apache Tomcat服务器数据交互(MySql数据库)