jdbc插入时获取自增id号

//2.进行插入方法
public boolean charu(Image Image){
    boolean flag=false;
    //1.先连接数据库
    Connection connection=getCon();
    PreparedStatement pst = null;
    String sql="INSERT INTO tb_banqiimgs(img_name,img_path) values(?,?)";
    Integer enterInfoId = null;
    try {
        //Statement.RETURN_GENERATED_KEYS:获取自动增加的id号
        pst = (PreparedStatement) connection.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
        //把相应的参数 添加到pst对象中

        pst.setString(1,Image.getImg_name());
        pst.setString(2,Image.getImage());
        //提交pst对象
        pst.executeUpdate();
        ResultSet rst = pst.getGeneratedKeys();
        if(rst.next()) {
            enterInfoId = rst.getInt(1);
            System.out.print("获取自动增加的id号=="+enterInfoId+"\n");
        }
        flag=true;
    }catch (SQLException e){
        e.printStackTrace();
    }
    return flag;
}