1.在cmd中进入mysql查看默认的编码格式:
mysql> show variables like "%char%";
若不是utf8(因为我用的是utf8)，关掉mysql服务，在my.ini中添加
[client] default-character-set=utf8 [mysqld] default-storage-engine=INNODB character-set-server=utf8 collation-server=utf8_general_ci [mysql] default-character-set=utf8
2.eclipse中的编码格式是否为utf8
3.如果还是不可以，检查mysql客户端表格的编码方式
show create table tablename
如果不是utf-8.删掉重新建立一张表（之前我在原表上改动没有成功，可能是我自己操作的原因）
分享一个经典的JDBC连接MySQL的程序
import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class MySQLConnection { public static void main(String[] args) { Connection conn = null; Statement stmt = null; ResultSet rs = null; String url = null; String user = null; String password = null; String sql = null; try { Class.forName("com.mysql.jdbc.Driver"); //加载mysq驱动 } catch (ClassNotFoundException e) { System.out.println("驱动加载错误"); e.printStackTrace();//打印出错详细信息 } try { url = "jdbc:mysql://localhost/test?user=root&password=yqs2602555&useUnicode=true&&characterEncoding=gb2312&autoReconnect = true";//简单写法：url = "jdbc:myqsl://localhost/test(数据库名)? user=root(用户)&password=yqs2602555(密码)"; user = "root"; password = "yqs2602555"; conn = DriverManager.getConnection(url,user,password); } catch (SQLException e) { System.out.println("数据库链接错误"); e.printStackTrace(); } try { stmt = conn.createStatement(); sql = "select * from dept";//dept这张表有deptno，deptname和age这三个字段 rs = stmt.executeQuery(sql);//执行sql语句 while(rs.next()) { System.out.print(rs.getInt("deptno") + " "); System.out.print(rs.getString("deptname") + " "); System.out.println(rs.getInt("age") + " "); } } catch (SQLException e) { System.out.println("数据操作错误"); e.printStackTrace(); } //关闭数据库 try { if(rs != null) { rs.close(); rs = null; } if(stmt != null) { stmt.close(); stmt = null; } if(conn != null) { conn.close(); conn = null; } } catch(Exception e) { System.out.println("数据库关闭错误"); e.printStackTrace(); } } }
运行结果如下：
1 yqs 0
2 hello 0
3 yqsshr 0
4 world 0
5 hryspa 0
1 yqs 0
2 hello 0
3 yqsshr 0
4 world 0
5 hryspa 0
1 yqs11 21
1 yqs21 31
1 yqs31 41
1 yqs41 51