Method of cleaning DNS cache with Java

• Java

This article describes the method of cleaning DNS cache with Java. Share with you for your reference. The specific analysis is as follows:

1、 Test environment

OS：Windows7 x64

JDK：1.6. 0_ forty-five

2、 I have found four ways to clean up the DNS cache of the JVM, which you can choose according to your own situation.

1. Call InetAddress for the first time Before getbyname(), set Java security. Security. setProperty("networkaddress.cache.ttl","0"); 2. Modify JRE / lib / security / Java Networkaddress under security cache. TTL attribute 3 Set - dsun. In the JVM startup parameters net. inetaddr. ttl=0 4. Through reflection cleaning, such as the clearcache method in this article

3、 Code

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