通过 Jedis 客户端连接 redis 报错 connect timed out

当我使用如下的代码来测试redis的时候报错，代码如下：

// 单机版测试  
@Test  
public void testJedisSingle() throws Exception {  
    Jedis jedis = new Jedis("192.168.1.118", 6379);  
    jedis.set("shenlinnan", "hahahahahaha");  
    System.out.println(jedis.get("shenlinnan"));  
    jedis.close();  
}

报错信息如下：

redis.clients.jedis.exceptions.JedisConnectionException: java.net.SocketTimeoutException: connect timed out  
    at redis.clients.jedis.Connection.connect(Connection.java:207)  
    at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)  
    at redis.clients.jedis.Connection.sendCommand(Connection.java:126)  
    at redis.clients.jedis.BinaryClient.set(BinaryClient.java:110)  
    at redis.clients.jedis.Client.set(Client.java:47)  
    at redis.clients.jedis.Jedis.set(Jedis.java:120)  
    at com.juhehl.kapu.rest.component.impl.JedisClientSingleTest.testJedisSingle(JedisClientSingleTest.java:24)  
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)  
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)  
    at java.lang.reflect.Method.invoke(Method.java:497)  
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)  
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)  
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)  
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)  
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)  
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)  
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)  
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)  
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)  
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)  
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)  
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)  
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)  
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)  
    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)  
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)  
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)  
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)  
    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)  
Caused by: java.net.SocketTimeoutException: connect timed out  
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)  
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)  
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)  
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)  
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)  
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)  
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)  
    at java.net.Socket.connect(Socket.java:589)  
    at redis.clients.jedis.Connection.connect(Connection.java:184)  
    ... 29 more

很明显，我无法连接到我刚刚安装的redis上，这时候使用windows的telnet命令，猜测是由于linux的防火墙导致的无法连接到redis，所以，先查看一下防火墙的位置，如图所示：

以前都是用iptables，但是centos7.0之后就换成了firewalled了，那么我查看了firewalled的状态为active（running），很明显是在运行中的了，我尝试关闭一下防火墙，看看是不是防火墙影响的我无法访问redis，如图：

关闭之后，测试一下程序，如图：

结果显示操作redis正常，可以得出结论，就是linux的防火墙影响的redis的连接，所以，我要重新开启防火墙，在开启之后，增加这个端口号可以外网访问，首先，先进行开启防火墙的操作，如图：

再次检查一下防火墙的状态，如图：

这样说明已经正常开启了防火墙，下面需要开启6379端口，如图：

success说明添加成功了，下面需要重新启动防火墙，如图：

再次进行程序测试，如图：

结果正确，这样就可以正常的访问redis了。