讀取配置文件創建一個標準鏈接池

package cn.utlis;

import java.io.PrintWriter;
import java.sql.Array;
import java.sql.Blob;
import java.sql.CallableStatement;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.NClob;
import java.sql.PreparedStatement;
import java.sql.SQLClientInfoException;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.sql.SQLWarning;
import java.sql.SQLXML;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Struct;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Executor;
import java.util.logging.Logger;

import javax.sql.DataSource;
/*
 * 標準鏈接池
 */
public class MyDatasource implements DataSource {
    //    聲明一個集合，維護鏈接
    private static List<Connection> pool = new ArrayList<Connection>();

    public MyDatasource(){
        try {
            Properties pt = new Properties();
            pt.load(MyDatasource.class.getResourceAsStream("jdbc.properties"));
            String driver = pt.getProperty("mydriver");
            String url = pt.getProperty("myurl");
            String user = pt.getProperty("myuser");
            String pwd = pt.getProperty("mypwd");
            Class.forName(driver);
            for (int i = 0; i < 3; i++) {
                Connection con = DriverManager.getConnection(url, user, pwd);
                //4.對con 作包含
                MyConnection ds = new MyConnection(con);
                pool.add(ds);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //獲取鏈接
    public Connection getConnection(){
        //對鏈接池作同步
        synchronized (pool) {
            while (pool.size() == 0) {
                try {
                    pool.wait();//等待
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            Connection con = pool.remove(0);
            return con;
        }
    }
    //1.對connection進行包裝
    class MyConnection implements Connection{
        //2.擁有一個connection的成員

        private Connection realCon;
        //3.經過構造方法設置realCon
        public MyConnection(Connection con){
            this.realCon = con;
        }
        //5.回收鏈接
        @Override
        public void close() throws SQLException {
            synchronized (pool) {
                pool.add(this);
                pool.notify();
            }
        }

        @Override
        public <T> T unwrap(Class<T> iface) throws SQLException {

            return null;
        }

        @Override
        public boolean isWrapperFor(Class<?> iface) throws SQLException {

            return false;
        }

        @Override
        public Statement createStatement() throws SQLException {

            return null;
        }

        @Override
        public PreparedStatement prepareStatement(String sql) throws SQLException {

            return null;
        }

        @Override
        public CallableStatement prepareCall(String sql) throws SQLException {

            return null;
        }

        @Override
        public String nativeSQL(String sql) throws SQLException {

            return null;
        }

        @Override
        public void setAutoCommit(boolean autoCommit) throws SQLException {


        }

        @Override
        public boolean getAutoCommit() throws SQLException {

            return false;
        }

        @Override
        public void commit() throws SQLException {


        }

        @Override
        public void rollback() throws SQLException {


        }

        @Override
        public boolean isClosed() throws SQLException {

            return false;
        }

        @Override
        public DatabaseMetaData getMetaData() throws SQLException {

            return null;
        }

        @Override
        public void setReadOnly(boolean readOnly) throws SQLException {


        }

        @Override
        public boolean isReadOnly() throws SQLException {

            return false;
        }

        @Override
        public void setCatalog(String catalog) throws SQLException {


        }

        @Override
        public String getCatalog() throws SQLException {

            return null;
        }

        @Override
        public void setTransactionIsolation(int level) throws SQLException {


        }

        @Override
        public int getTransactionIsolation() throws SQLException {

            return 0;
        }

        @Override
        public SQLWarning getWarnings() throws SQLException {

            return null;
        }

        @Override
        public void clearWarnings() throws SQLException {


        }

        @Override
        public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {

            return null;
        }

        @Override
        public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency)
                throws SQLException {

            return null;
        }

        @Override
        public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency)
                throws SQLException {

            return null;
        }

        @Override
        public Map<String, Class<?>> getTypeMap() throws SQLException {

            return null;
        }

        @Override
        public void setTypeMap(Map<String, Class<?>> map) throws SQLException {


        }

        @Override
        public void setHoldability(int holdability) throws SQLException {


        }

        @Override
        public int getHoldability() throws SQLException {

            return 0;
        }

        @Override
        public Savepoint setSavepoint() throws SQLException {

            return null;
        }

        @Override
        public Savepoint setSavepoint(String name) throws SQLException {

            return null;
        }

        @Override
        public void rollback(Savepoint savepoint) throws SQLException {


        }

        @Override
        public void releaseSavepoint(Savepoint savepoint) throws SQLException {


        }

        @Override
        public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability)
                throws SQLException {

            return null;
        }

        @Override
        public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency,
                int resultSetHoldability) throws SQLException {

            return null;
        }

        @Override
        public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency,
                int resultSetHoldability) throws SQLException {

            return null;
        }

        @Override
        public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {

            return null;
        }

        @Override
        public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {

            return null;
        }

        @Override
        public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {

            return null;
        }

        @Override
        public Clob createClob() throws SQLException {

            return null;
        }

        @Override
        public Blob createBlob() throws SQLException {

            return null;
        }

        @Override
        public NClob createNClob() throws SQLException {

            return null;
        }

        @Override
        public SQLXML createSQLXML() throws SQLException {

            return null;
        }

        @Override
        public boolean isValid(int timeout) throws SQLException {

            return false;
        }

        @Override
        public void setClientInfo(String name, String value) throws SQLClientInfoException {


        }

        @Override
        public void setClientInfo(Properties properties) throws SQLClientInfoException {


        }

        @Override
        public String getClientInfo(String name) throws SQLException {

            return null;
        }

        @Override
        public Properties getClientInfo() throws SQLException {

            return null;
        }

        @Override
        public Array createArrayOf(String typeName, Object[] elements) throws SQLException {

            return null;
        }

        @Override
        public Struct createStruct(String typeName, Object[] attributes) throws SQLException {

            return null;
        }

        @Override
        public void setSchema(String schema) throws SQLException {


        }

        @Override
        public String getSchema() throws SQLException {

            return null;
        }

        @Override
        public void abort(Executor executor) throws SQLException {


        }

        @Override
        public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {


        }

        @Override
        public int getNetworkTimeout() throws SQLException {

            return 0;
        }



    }

    @Override
    public PrintWriter getLogWriter() throws SQLException {

        return null;
    }
    @Override
    public void setLogWriter(PrintWriter out) throws SQLException {


    }
    @Override
    public void setLoginTimeout(int seconds) throws SQLException {


    }
    @Override
    public int getLoginTimeout() throws SQLException {

        return 0;
    }
    @Override
    public Logger getParentLogger() throws SQLFeatureNotSupportedException {

        return null;
    }
    @Override
    public <T> T unwrap(Class<T> iface) throws SQLException {

        return null;
    }
    @Override
    public boolean isWrapperFor(Class<?> iface) throws SQLException {

        return false;
    }
    @Override
    public Connection getConnection(String username, String password) throws SQLException {

        return null;
    }
}