Android客户端将用户的注册信息上传到Tomcat Web服务器，Servlet将注册信息写入到MySQL中。
1,准备工作
(1)在MySQL中创建好要使用的数据库和数据表。
(2)设置好Tomcat的数据库连接池。
2，Android客户端Activity和Layout的设计
(1)一个简单的注册界面，sign_layout.xml
sign_layout.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusableInTouchMode="true"
android:background="#ff6699cc"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#fffffffb"
android:orientation="horizontal"
android:padding="40dp" >
<EditText
android:id="@+id/etSgAccount"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dp"
android:layout_marginBottom="20dp"
android:hint="@string/Account"
android:inputType="textEmailAddress" />
<EditText
android:id="@+id/etSgPassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/etSgAccount"
android:layout_marginBottom="20dp"
android:hint="@string/Password"
android:inputType="textPassword" />
<EditText
android:id="@+id/etSgRePassword"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/etSgPassword"
android:layout_marginBottom="20dp"
android:hint="@string/repassword"
android:inputType="textPassword" />
<Button
android:id="@+id/btnSign"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/etSgRePassword"
android:background="#ff6699cc"
android:onClick="onLogin"
android:text="@string/signup"
android:textColor="#ffffffff"
android:textSize="24sp" />
</RelativeLayout>
</LinearLayout>(2)编写对应的Activity——SignActivity.java
package com.bnutalk.activitytest;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class SignActivity extends Activity {
private EditText username;
private EditText password;
private Button signup;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.sign_layout);
username=(EditText) findViewById(R.id.etSgAccount);
password=(EditText) findViewById(R.id.etSgPassword);
signup=(Button) findViewById(R.id.btnSign);
}
/*发起HTTP请求*/
public void onLogin(View v)
{
String url="http://172.22.140.237:8080/web/MysServlet";
new HttpThread(url, username.getText().toString(), password.getText().toString()).start();
}
}
其中的重要代码是函数onLogin,它表示当按下Signup按钮时，启动Http线程，向服务器发起Http请求。
/*发起HTTP请求*/
public void onLogin(View v)
{
/*url要访问的Tomcat的Servlet地址,将ip换成Tomacat所在主机的ip*/
String url="http://172.22.140.237:8080/web/MysServlet";
/*调用访问网络的HttpThread*/
new HttpThread(url, username.getText().toString(), password.getText().toString()).start();
}
(3)新建一个Tread类——HttpTread
访问网络属于耗时操作，因此用一个单独的线程来实现。
package com.bnutalk.activitytest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import android.R.string;
public class HttpThread extends Thread {
String url;
String username;
String password;
public HttpThread(String url, String username, String password) {
// TODO Auto-generated constructor stub
this.url = url;
this.username = username;
this.password = password;
}
private void doGet() throws IOException {
/*将username和password传给Tomcat服务器*/
url=url+"?username="+username+"&password="+password;
try {
URL httpUrl = new URL(url);
/*获取网络连接*/
HttpURLConnection conn = (HttpURLConnection) httpUrl.openConnection();
/*设置请求方法为GET方法*/
conn.setRequestMethod("GET");
/*设置访问超时时间*/
conn.setReadTimeout(5000);
BufferedReader reader=new BufferedReader(new InputStreamReader(conn.getInputStream()));
String str;
StringBuffer sb=new StringBuffer();
//读取服务器返回的信息
while((str=reader.readLine())!=null)
{
sb.append(str);
}
//把服务端返回的数据打印出来
System.out.println("result"+sb.toString());
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/*在run中调用doGet*/
@Override
public void run() {
try {
doGet();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
(4)在AndroidManifest.xml中添加网络访问权限
<uses-permission android:name="android.permission.INTERNET"/>如图：
3,Server和Servlet设置
(1)建立好一个server和一个web项目，在web下建立所需的Servlet
如图所示，注册用到的Servlet是MyServlet.java,请忽略LogServlet.java
(2)在web.xml中注册Servlet
<servlet>
<servlet-name>DataServiceServlet</servlet-name>
<servlet-class>com.imooc.servlet.MyServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DataServiceServlet</servlet-name>
<url-pattern>/DataServiceServlet</url-pattern>
</servlet-mapping>如图所示：
(3)编写MyServlet.java
package com.imooc.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;
import org.apache.catalina.Context;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.ResultSet;
import com.mysql.jdbc.Statement;
/**
* Servlet implementation class MyServlet
*/
@WebServlet("/MyServlet")
public class MyServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public MyServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
/*获取请求的数据，并向控制台输出*/
String username = request.getParameter("username");
String password = request.getParameter("password");
PrintWriter out = response.getWriter();
System.out.println("username" + "," + username);
System.out.println("password" + "," + password);
int rs ;
String sql = "insert into bnutalk(id,username,psswd) values(3,?,?)";
/*实现向MySQL中插入username和password*/
try {
InitialContext ctx = new InitialContext();
DataSource ds = (DataSource) ctx.lookup("java:comp/env/jdbc/t1");
/*获得数据库的连接*/
java.sql.Connection conn =ds.getConnection();
conn = ds.getConnection();
/*执行sql*/
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, username);
ps.setString(2, password);
rs= ps.executeUpdate();
} catch (SQLException se) {
System.out.println("SQLException: " + se.getMessage());
} catch (NamingException ne) {
System.out.println("NamingException: " + ne.getMessage());
}
}
}
4，运行
(1)运行web项目，run on server
(2)运行Android客户端
如图：
先看看此时数据表中的内容：
(3)注册一个用户
用户名和密码都是csdn
控制台输出：
再次查看数据表：
如果有看不懂的，可以先去补一补Servlet,Tomcat数据库连接池，MySQL，Thread这些基础知识，有个大概印象，最起码能知道其中的逻辑，大体框架，实现机制。脑海中一个框架图，再来看代码就很简单了。
时间： 2024-10-05 00:04:24