如果在本地搭一个服务器和mysql数据库环境，如果使用java来访问_MySQL

import java.sql.*;public class ConnTest {	 public static final String _ID = "_id";	 public static final String TABLE_NAME = "spider";	 public static final String NAME = "name";	 public static final String CLASS_NAME = "class";	 private static final String CREATE_TABLE_STMT =	"CREATE TABLE IF NOT EXISTS " + TABLE_NAME + " ("	+ _ID + " INTEGER PRIMARY KEY,"	+ NAME 		+ " TEXT,"	+ CLASS_NAME		+ " TEXT"	+ ");";	 	public static void main(String[] args) {		java.sql.Connection conn = null;		Statement st = null;		ResultSet rs = null;		try {			Class.forName("com.mysql.jdbc.Driver");//加载jar包			conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8","root","");//取得数据库连接						//这个是创建一个表			st = conn.createStatement();			st.execute(CREATE_TABLE_STMT);						//这是插入一条语句//			st = conn.createStatement();//			String sql = "insert into spider(_id,name,class) values ('1','xiaoming','A')";//			st.executeUpdate(sql);									//这是采用preparedStatement实现的插入一条语句//			String sql = "insert into spider(_id,name,class) values (?,?,?)";//			PreparedStatement _prepInsert = conn.prepareStatement(sql);//			_prepInsert.setInt(1, 2);//			_prepInsert.setString(2, "xiaoli");//			_prepInsert.setString(3, "B");//			_prepInsert.executeUpdate();						//			//这是一条更新语句//			st = conn.createStatement();//			String sql = "update spider set class = 'C' where _id = '1'";//			st.executeUpdate(sql);						//			//这是一条删除语句//			st = conn.createStatement();//			String sql = "delete from spider where _id = '1'";//			st.executeUpdate(sql);												//这是查询语句			st = conn.createStatement();			String sql = "select * from spider";			rs = st.executeQuery(sql);			while(rs.next()){				int id = rs.getInt("_id");				String name = rs.getString("name");				String class1 = rs.getString("class");				System.out.println("id="+id+" name="+name+" class1="+class1);			}					}catch(Exception e){			e.printStackTrace();		}				if(rs != null)		{			try {				rs.close();			} catch (SQLException e) {				e.printStackTrace();			}		}						if(st != null)		{			try {				st.close();			} catch (SQLException e) {				e.printStackTrace();			}		}		if(conn != null)		{			try {				conn.close();			} catch (SQLException e) {				e.printStackTrace();			}		}	}}