解决办法：java.net.SocketException: Address family not supported by protocol family:

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本文介绍了解决Java中遇到的SocketException问题，特别是当错误信息为'Address family not supported by protocol family'时的三种有效方法：修改hosts文件配置、设置JVM参数及调整系统属性。

java.net.SocketException: Address family not supported by protocol family: connect
at sun.nio.ch.Net.connect(Native Method)
at sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:532)
at org.apache.zookeeper.ClientCnxnSocketNIO.registerAndConnect(ClientCnxnSocketNIO.java:277)
at org.apache.zookeeper.ClientCnxnSocketNIO.connect(ClientCnxnSocketNIO.java:287)
at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1024)
at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1060)

方法1：设置hosts文件
使localhost指向IPV4地址127.0.0.1
127.0.0.1 localhost

方法2：设置JVM参数
-Djava.net.preferIPv4Stack=true

方法3：设置系统属性
System.setProperty("java.net.preferIPv4Stack", "true");