java如何连接到opensuse上的mysql localhost？

3 周，4 日 Questions & Answers 2990

首先是配置的详细信息：

带Parallels Plesk Panel 10（64位）服务器的openSUSE 11.3
MySQL已安装并正在运行（无“跳过网络”）
java 1.6.0_24（java热点（TM）64位服务器虚拟机（构建19.1-b02，混合模式））

mysql服务器侦听0.0.0.0:3306

netstat -lnp | grep mysql
tcp        0      0 0.0.0.0:3306            0.0.0.0:*               LISTEN      3499/mysqld         
unix  2      [ ACC ]     STREAM     LISTENING     10916  3499/mysqld         /var/run/mysql/mysql.sock

现在问题来了。我无法使用以下类通过jdbc（mysql-connector-java-5.1.17-bin.jar）从localhost连接到mysql：

public class Connect {
    public static void main(String[] args) {
        Connection conn = null;

        try {
            String userName = "user";
            String password = "password";
            // This also doesn't work with "localhost" in the connect string.
            String url = "jdbc:mysql://127.0.0.1:3306/database";

            System.out.println("URL: " + url);

            Class.forName("com.mysql.jdbc.Driver").newInstance();
            conn = DriverManager.getConnection(url, userName, password);
            System.out.println("Database connection established");
        } catch (Exception e) {
            e.printStackTrace();
            System.err.println("Cannot connect to database server");
        } finally {
            if (conn != null) {
                try {
                    conn.close();
                    System.out.println("Database connection terminated");
                } catch (Exception e) { /* ignore close errors */
                }
            }
        }
    }
}

更多详情：

telnet超时

telnet localhost 3306
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection timed out

nmap显示在本地主机上过滤端口3306

nmap -p 3306 localhost
Starting Nmap 5.00 ( http://nmap.org ) at 2011-08-30 19:21 CEST
Interesting ports on localhost (127.0.0.1):
PORT     STATE    SERVICE
3306/tcp filtered mysql

Nmap done: 1 IP address (1 host up) scanned in 2.31 seconds

如果我使用connect类从外部连接到servers3306端口，一切正常

因为我认为这是防火墙的问题。这是从plesk配置中心自动生成的防火墙

iptables -nvL
Chain INPUT (policy DROP 0 packets, 0 bytes)
target     prot opt in     out     source               destination         
ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED 
REJECT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp flags:!0x17/0x02 reject-with tcp-reset 
DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0           state INVALID 
ACCEPT     all  --  lo     *       0.0.0.0/0            0.0.0.0/0           
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:10000 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:4306 
DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:12443 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:11443 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:11444 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:8447 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:8443 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:8880 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:80 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:443 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:21 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:22 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:587 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:25 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:465 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:110 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:995 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:143 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:993 
DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:106 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:3306 
ACCEPT     tcp  --  *      *       127.0.0.1            0.0.0.0/0           tcp dpt:5432 
DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:5432 
ACCEPT     tcp  --  *      *       127.0.0.1            0.0.0.0/0           tcp dpt:9008 
ACCEPT     tcp  --  *      *       127.0.0.1            0.0.0.0/0           tcp dpt:9080 
DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:9008 
DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:9080 
DROP       udp  --  *      *       0.0.0.0/0            0.0.0.0/0           udp dpt:137 
DROP       udp  --  *      *       0.0.0.0/0            0.0.0.0/0           udp dpt:138 
DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:139 
DROP       tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:445 
DROP       udp  --  *      *       0.0.0.0/0            0.0.0.0/0           udp dpt:1194 
ACCEPT     udp  --  *      *       0.0.0.0/0            0.0.0.0/0           udp dpt:53 
ACCEPT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp dpt:53 
DROP       icmp --  *      *       0.0.0.0/0            0.0.0.0/0           icmp type 8 code 0 
DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0           

Chain FORWARD (policy DROP 0 packets, 0 bytes)
target     prot opt in     out     source               destination         
ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED 
REJECT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp flags:!0x17/0x02 reject-with tcp-reset 
DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0           state INVALID 
ACCEPT     all  --  lo     lo      0.0.0.0/0            0.0.0.0/0           
DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0           

Chain OUTPUT (policy DROP 0 packets, 0 bytes)
target     prot opt in     out     source               destination         
ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED 
REJECT     tcp  --  *      *       0.0.0.0/0            0.0.0.0/0           tcp flags:!0x17/0x02 reject-with tcp-reset 
DROP       all  --  *      *       0.0.0.0/0            0.0.0.0/0           state INVALID 
ACCEPT     all  --  *      lo      0.0.0.0/0            0.0.0.0/0           
ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0

此外，我可以使用perl连接到本地mysql

$dsn = "dbi:mysql:$database:localhost:3306";
$connect = DBI->connect($dsn, $user, $pw);

如果有任何关于解决这一问题的暗示，我将感到遗憾。马丁

共 (2) 个答案

# 1 楼答案
你能修改你的IPTables吗？如果可以，请尝试添加此规则：
```
iptables -I INPUT -s 127.0.0.1 -p tcp  dport 3306 -j ACCEPT
```
# 2 楼答案
您的用户是否具有从本地主机访问数据库的权限？您是如何创建用户的
```
grant all on database.* to 'user'@'localhost' identified by 'password';
grant all on database.* to 'user'@'%' identified by 'password';
```
任何一个都可能成功。我以前在没有指定主机名的情况下遇到过问题

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java如何连接到opensuse上的mysql localhost？

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