Android客户端、服务端、数据库开发流程及需要环境

一、Android客户端、服务端、数据库开发所需要环境

1.JDK8+

2.Android studio

3.eclipse

4.mysql

5.tomcat

二、Android客户端、服务端、数据库开发完整流程

1.用AS开发客户端，并定义链接，目前流行传输格式为JSon

2.用eclipse开发服务端，并以JSon格式为传输格式

3.在mysql服务器中建立table

4.客户端和服务端的网络链路要保证畅通

5.将服务端程序部署到192.168.1.102

6.将客户端程序安装到移动端

三、举例说明及关键代码

1.客户端

定义服务链接方式：    public String serverUrl = "http://192.168.1.102:8080/androidWeb/servlet/loadMessage";

用户登录、验证密码并取得相关信息的逻辑编码说明如下

传输参数：

HttpClient client = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(serverUrl);
List<NameValuePair> params = new ArrayList<NameValuePair>(); 
params.add(new BasicNameValuePair("username", username));
params.add(new BasicNameValuePair("password", password));

调用服务并得到返回

httpPost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
httpResponse = client.execute(httpPost);
if(httpResponse.getStatusLine().getStatusCode() == 200) {
HttpEntity entity = httpResponse.getEntity();
String entityString = EntityUtils.toString(entity);
String jsonString = entityString.substring(entityString.indexOf("{"));
JSONObject json = new JSONObject(jsonString);
sendMessage(MSG_LOGIN_RESULT, json);
2.服务端

A.web.xml的定义例子：

  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>loadMessage</servlet-name>
    <servlet-class>com.test.servlet.loadMessage</servlet-class>
  </servlet>
  
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>NewAccount</servlet-name>
    <servlet-class>com.test.servlet.NewAccount</servlet-class>
  </servlet>


  <servlet-mapping>
    <servlet-name>loadMessage</servlet-name>
    <url-pattern>/servlet/loadMessage</url-pattern>
  </servlet-mapping>
  
  <servlet-mapping>
    <servlet-name>NewAccount</servlet-name>
    <url-pattern>/servlet/NewAccount</url-pattern>
  </servlet-mapping>

B.DB 链接方法

Class.forName("com.mysql.jdbc.Driver");
connection = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8", "root", "123456

C.接口

HashMap<String, Object> resultMap = new HashMap<String, Object>();
String sql = "select * from " + DBManager.TABLE_NAME + " where " + DBManager.COLUMN_USERNAME + " = " + "'" + username + "'" ;
System.out.println("url = " + sql);
DBManager db = new DBManager();
ResultSet rst = db.query(sql);
try {
rst.next();
String pwd = rst.getString(DBManager.COLUMN_PASSWORD);
if(!password.equals(pwd)) {
resultMap.put("result_code", 1);
} else {
resultMap.put("result_code", 0);
resultMap.put(DBManager.COLUMN_USERNAME, rst.getString(DBManager.COLUMN_USERNAME));
resultMap.put(DBManager.COLUMN_GENDER, rst.getString(DBManager.COLUMN_GENDER));
resultMap.put(DBManager.COLUMN_AGE, rst.getInt(DBManager.COLUMN_AGE));
resultMap.put(DBManager.COLUMN_PHONE, rst.getString(DBManager.COLUMN_PHONE));
resultMap.put(DBManager.COLUMN_EMAIL, rst.getString(DBManager.COLUMN_EMAIL));
}
} catch (SQLException e) {
resultMap.put("result_code", 2);
e.printStackTrace();
}
return (new Gson()).toJson(resultMap);

3.DB

A.创建库表

create table login_info (
username varchar(80) not null,
password varchar (20),
gender varchar (10),
age int,
phone varchar (20),
email varchar (50),
primary key (username)
)

B.产生一条可登录的数据（当然也可以从客户端注册来产生数据）
insert login_info values("admin","admin","nan",20,"12345678901","abc@abc.com")

四、测试结果