Android直接使用JDBC+SSH連接外網MySQL數據庫

         網上很多人都說這種做法是不合理的，其實我也是這麼覺得的，因爲安全得不到保障，而且對數據庫操作的業務邏輯不可能都放在Android斷，這樣會對APP造成很大壓力。但是我們項目精靈非要做，於是我們就硬着頭皮做了，也測試通了，我這裏提供兩個版本的DEMO，一個是連接內網，一個是連接外網，目前只在模擬器上測試過，真機不敢保證

附註：我的代碼是參照別人的，本來想列舉鏈接的，但是找不到了，如果以後找到原文鏈接，我一定補上。

首先是內網版（Eclipse）：

package com.example.jdbctest;

import java.sql.Connection;
import java.sql.SQLException;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

public class TestActivity extends Activity {
	private static final String REMOTE_IP = "192.168.1.7";//服務器地址
	private static final String URL = "jdbc:mysql://" + REMOTE_IP + "/zw";
	private static final String USER = "root";//數據庫賬戶
	private static final String PASSWORD = "root";//數據庫密碼

	private Connection conn;

	public void onConn(View view) {

		new Thread() {
			public void run() {
				Log.e("============", "你麻痹");
				conn = Util.openConnection(URL, USER, PASSWORD);
			}
		}.start();
	}

	public void onInsert(View view) {
		new Thread() {
			public void run() {
				Log.e("============", "你麻痹的插入");
				String sql = "insert into users values(3, 'yinhongbo', 'yinhongbo')";
				Util.execSQL(conn, sql);
			}
		}.start();
	}

	public void onDelete(View view) {
		String sql = "delete from mytable where name='mark'";
		Util.execSQL(conn, sql);
	}

	public void onUpdate(View view) {
		String sql = "update mytable set name='lilei' where name='hanmeimei'";
		Util.execSQL(conn, sql);
	}

	public void onQuery(View view) {
		new Thread() {
			public void run() {
				Log.e("============", "你麻痹的查詢");
				Util.query(conn, "select * from users");
			}
		}.start();
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_test);
	}

	@Override
	protected void onDestroy() {
		super.onDestroy();
		if (conn != null) {
			try {
				conn.close();
			} catch (SQLException e) {
				conn = null;
			} finally {
				conn = null;
			}
		}
	}

}

Util類：

package com.example.jdbctest;

import java.sql.Connection;  
import java.sql.DriverManager;  
import java.sql.ResultSet;  
import java.sql.SQLException;  
import java.sql.Statement;

import android.util.Log;

public class Util {
	public static Connection openConnection(String url, String user,
			String password) {
		Connection conn = null;
		try {
			final String DRIVER_NAME = "com.mysql.jdbc.Driver";
			Class.forName(DRIVER_NAME);
			conn = DriverManager.getConnection(url, user, password);
		} catch (ClassNotFoundException e) {
			conn = null;
		} catch (SQLException e) {
			conn = null;
		}

		return conn;
	}

	public static void query(Connection conn, String sql) {

		if (conn == null) {
			Log.e("======conn結果======", "conn = null");
			return;
		}

		Statement statement = null;
		ResultSet result = null;

		try {
			statement = conn.createStatement();
			result = statement.executeQuery(sql);
			if (result != null && result.first()) {
				int idColumnIndex = result.findColumn("id");
				int nameColumnIndex = result.findColumn("user_name");
				Log.e("======結果======", "結果");
				while (!result.isAfterLast()) {
					Log.e("======id======", result.getString(idColumnIndex) + "\t\t");
					Log.e("======name======", result.getString(nameColumnIndex));
					
//					System.out.print(result.getString(idColumnIndex) + "\t\t");
//					System.out.println(result.getString(nameColumnIndex));
					result.next();
				}
			}
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			try {
				if (result != null) {
					result.close();
					result = null;
				}
				if (statement != null) {
					statement.close();
					statement = null;
				}

			} catch (SQLException sqle) {

			}
		}
	}

	public static boolean execSQL(Connection conn, String sql) {
		boolean execResult = false;
		if (conn == null) {
			return execResult;
		}

		Statement statement = null;

		try {
			statement = conn.createStatement();
			if (statement != null) {
				execResult = statement.execute(sql);
			}
		} catch (SQLException e) {
			execResult = false;
		}

		return execResult;
	}
}

外網版（Android Studio）：

package com.jingchujie.jdbctestinas;

import java.sql.Connection;
import java.sql.SQLException;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

public class MainActivity extends Activity {
    //    private static final String REMOTE_IP = "192.168.1.7";
//    private static final String URL = "jdbc:mysql://" + REMOTE_IP + "/zw";
//    private static final String USER = "root";
//    private static final String PASSWORD = "root";
    private static final String REMOTE_IP = "localhost:33104";//這裏是映射地址，可以隨意寫，不是服務器地址
    private static final String URL = "jdbc:mysql://" + REMOTE_IP + "/mobile";
    private static final String USER = "root";
    private static final String PASSWORD = "";

    private Connection conn;

    public void onConnSsh(View view) {

        new Thread() {
            public void run() {
                Log.e("============", "預備連接服務器");
                Util.go();
            }
        }.start();
    }

    public void onConn(View view) {

        new Thread() {
            public void run() {
                Log.e("============", "預備連接數據庫");
                conn = Util.openConnection(URL, USER, PASSWORD);
            }
        }.start();
    }

    public void onInsert(View view) {
        new Thread() {
            public void run() {
                Log.e("============", "預備插入");
                String sql = "insert into users values(3, 'yinhongbo', 'yinhongbo')";
                Util.execSQL(conn, sql);
            }
        }.start();
    }

    public void onDelete(View view) {
        String sql = "delete from mytable where name='mark'";
        Util.execSQL(conn, sql);
    }

    public void onUpdate(View view) {
        String sql = "update mytable set name='lilei' where name='hanmeimei'";
        Util.execSQL(conn, sql);
    }

    public void onQuery(View view) {
        new Thread() {
            public void run() {
                Log.e("============", "預備查詢");
                Util.query(conn, "select * from users");
            }
        }.start();
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                conn = null;
            } finally {
                conn = null;
            }
        }
    }
}

Util類

package com.jingchujie.jdbctestinas;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import android.util.Log;

import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;

public class Util {
    public static void go() {
        String user = "root";//SSH連接用戶名
        String password = "1q2w3e";//SSH連接密碼
        String host = "192.168.1.4";//SSH服務器
        int lport = 33104;//本地端口（隨便取）
        String rhost = "localhost";//遠程MySQL服務器
        int rport = 3306;//遠程MySQL服務端口
        int port = 22;//SSH訪問端口
        try {
            JSch jsch = new JSch();
            Session session = jsch.getSession(user, host, port);
            session.setPassword(password);
            session.setConfig("StrictHostKeyChecking", "no");
            session.connect();
            Log.e("=======>", "服務器連接成功");
            System.out.println(session.getServerVersion());//這裏打印SSH服務器版本信息
            int assinged_port = session.setPortForwardingL(lport, rhost, rport);//將服務器端口和本地端口綁定，這樣就能通過訪問本地端口來訪問服務器
            System.out.println("localhost:" + assinged_port + " -> " + rhost + ":" + rport);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static Connection openConnection(String url, String user,
                                            String password) {
        Connection conn = null;
        try {
            final String DRIVER_NAME = "com.mysql.jdbc.Driver";
            Class.forName(DRIVER_NAME);
            conn = DriverManager.getConnection(url, user, password);
            Log.e("=====連接結果=======", "數據庫連接成功");
        } catch (ClassNotFoundException e) {
            Log.e("=====連接結果=======", "報ClassNotFoundException異常");
            conn = null;
        } catch (SQLException e) {
            Log.e("=====連接結果=======", "報SQLException異常");
            conn = null;
        }

        return conn;
    }

    public static void query(Connection conn, String sql) {

        if (conn == null) {
            Log.e("=====連接前判斷=======", "conn == null");
            return;
        }

        Statement statement = null;
        ResultSet result = null;

        try {
            statement = conn.createStatement();
            result = statement.executeQuery(sql);
            if (result != null && result.first()) {
                int idColumnIndex = result.findColumn("id");
                int nameColumnIndex = result.findColumn("user_name");
                Log.e("======結果======", "結果");
                while (!result.isAfterLast()) {
                    Log.e("======id======", result.getString(idColumnIndex) + "\t\t");
                    Log.e("======name======", result.getString(nameColumnIndex));

//					System.out.print(result.getString(idColumnIndex) + "\t\t");
//					System.out.println(result.getString(nameColumnIndex));
                    result.next();
                }
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                if (result != null) {
                    result.close();
                    result = null;
                }
                if (statement != null) {
                    statement.close();
                    statement = null;
                }

            } catch (SQLException sqle) {

            }
        }
    }

    public static boolean execSQL(Connection conn, String sql) {
        boolean execResult = false;
        if (conn == null) {
            return execResult;
        }

        Statement statement = null;

        try {
            statement = conn.createStatement();
            if (statement != null) {
                execResult = statement.execute(sql);
            }
        } catch (SQLException e) {
            execResult = false;
        }

        return execResult;
    }
}

源碼地址：

內網版（Eclipse）：http://download.csdn.net/detail/y280903468/9535368

外網版（Android studio）：http://download.csdn.net/detail/y280903468/9535374