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();	}	}	}}