java---直接链接数据库

需要的jar 下载

     private static final String url = "jdbc:mysql://192.168.xx.xxx:3306/yy";  //数据库地址
	 private static final String username = "root";  //数据库用户名
	 private static final String password = "";  //数据库密码
	 private static final String driver = "com.mysql.jdbc.Driver";  //mysql驱动
	 private static final Connection conn = null;
	
	public static void main(String[] args) {
    
    
		
		  Connection conn = conn();  //连接数据库
		  PreparedStatement stmt;
		  
		  
		   String sql = "select * from xx";
		   List<Map> list =new ArrayList<Map>();
		    try {
    
    
		     stmt= conn.prepareStatement(sql);
		     ResultSet executeQuery = stmt.executeQuery();
		     String s = null;
		    while(executeQuery.next()){
    
    
		    	 s=executeQuery.getString("content");
		    }
		    //String(json字符串转list<map>)
		    list = JSONObject.parseArray(s, Map.class);
		    
		    } catch (SQLException e) {
    
    
		     // TODO Auto-generated catch block
		     e.printStackTrace();
		    }
		   
		
	}		
	
	public static Connection conn() {
    
    
		  Connection conn = null;
		  try {
    
    
		   Class.forName(driver);  //加载数据库驱动
		   try {
    
    
		    conn = DriverManager.getConnection(url, username, password);  //连接数据库
		   } catch (SQLException e) {
    
    
		    e.printStackTrace();
		   }
		  } catch (ClassNotFoundException e) {
    
    
		   e.printStackTrace();
		  }
		  return conn;
		 }
 }