Android工程与web工程通过tomcat服务器建立网络连接案列

来源：互联网发布：校园网mac地址被修改编辑：程序博客网时间：2024/06/15 23:19

TestApp中Android客户端MainActivity

package com.example.testapp;

import java.net.URLEncoder;

import com.google.gson.Gson;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
   private Button btnTxt = null;
   private String txtUrl = "http://192.168.23.1:8080/TaxiServlet/TxtDataServlet";

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       btnTxt=(Button) findViewById(R.id.btnTxt);
       btnTxt.setOnClickListener(new OnClickListener() {

           public void onClick(View v) {
               new Thread(new Runnable() {

                   @SuppressWarnings("deprecation")
                   @Override
                   public void run() {
                       // TODO Auto-generated method stub
                       String retStr = "";
                       Student student = new Student();
                        student.setId(1);
                        student.setName("吕健1");
                        student.setClasse("1班");
                        Gson gson = new Gson();
                        String jsonTxt = gson.toJson(student);

                        try {
                            retStr = NetTool.sendTxt(txtUrl, jsonTxt,"UTF-8");
                        } catch (Exception e2) {
                            e2.printStackTrace();
                        }

                   }
               }).start();

           }
       });
   }

//   Handler handler=new Handler(){
//       public void handleMessage(android.os.Message msg) {};
//   };

   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
       // Inflate the menu; this adds items to the action bar if it is present.
       getMenuInflater().inflate(R.menu.main, menu);
       return true;
   }

   @Override
   public boolean onOptionsItemSelected(MenuItem item) {
       // Handle action bar item clicks here. The action bar will
       // automatically handle clicks on the Home/Up button, so long
       // as you specify a parent activity in AndroidManifest.xml.
       int id = item.getItemId();
       if (id == R.id.action_settings) {
           return true;
       }
       return super.onOptionsItemSelected(item);
   }

}

//Android端通过post传递数据TestApp

package com.example.testapp;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class NetTool {
   /**
     * 传送文本,例如Json,xml等
     */
    public static String sendTxt(String urlPath, String txt, String encoding)
            throws Exception {

        byte[] sendData = ("json="+txt).getBytes();
        URL url = new URL(urlPath);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setRequestMethod("POST");
        conn.setConnectTimeout(5000);
        // 如果通过post提交数据，必须设置允许对外输出数据
        conn.setDoOutput(true);
        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
        conn.setRequestProperty("Charset", encoding);
        conn.setRequestProperty("Content-Length", String
                .valueOf(sendData.length));
        OutputStream outStream = conn.getOutputStream();
        outStream.write(sendData);
        outStream.flush();
        outStream.close();
        if (conn.getResponseCode() == 200) {
            // 获得服务器响应的数据
            BufferedReader in = new BufferedReader(new InputStreamReader(conn
                    .getInputStream(), encoding));
            // 数据
            String retData = null;
            String responseData = "";
            while ((retData = in.readLine()) != null) {
                responseData += retData;
            }
            in.close();
            return responseData;
        }
        return "发送文本失败";
    }


}

Servlet服务器端通过json获得数据，并与本地数据库进行连接查询，servlet是在web项目中

因此，需要配置web.xml

package com.test.servlet;

import java.awt.Button;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URLDecoder;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import ceshi.User;

import com.db.D1;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import net.sf.json.JSON;
import net.sf.json.JSONObject;

public class TxtDataServlet extends HttpServlet {


    @SuppressWarnings("deprecation")
   public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
       System.out.println("post成功了，杜哥");
       request.setCharacterEncoding("UTF-8");
       Gson gson=new Gson();

       String jsonStr= request.getParameter("json");
       Student k=gson.fromJson(jsonStr, Student.class);

       Connection con = null;
       ResultSet rs = null;
       try {
           Class.forName( "oracle.jdbc.driver.OracleDriver" );// 加载驱动程序
           con = DriverManager.getConnection( "jdbc:oracle:thin:@127.0.0.1:1521:test", "system", "123456" );
           String sql="select * from student where id='"+k.getId()+"'and name='"+k.getName()+"'";
              Statement stmt=con.createStatement();//创建SQL命令对象
              stmt.executeQuery(sql);//执行查询命令
              rs=stmt.executeQuery(sql);//返回SQL语句查询结果集(集合)
//              if(rs.next()){
//
//              }
              while(rs.next()){
                  System.out.println("连接成功");
                  System.out.println(rs.getString("id")+"\t"+rs.getString("name")+"\t"+rs.getString("classes")
                          +"\t"+rs.getString("age"));
              }
              //关闭连接
              stmt.close();//关闭命令对象连接
              con.close();//关闭数据库连接
       } catch (ClassNotFoundException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       } catch (SQLException e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }


    }

}

web.xml中的配置

<servlet>
        <servlet-name>SynDataServlet</servlet-name>
        <servlet-class>com.test.servlet.TxtDataServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>SynDataServlet</servlet-name>
        <url-pattern>/TxtDataServlet</url-pattern>
    </servlet-mapping>

1 0