代码查看import的类是出自哪个jar包的方法(转)

import java.security.ProtectionDomain;
import java.security.CodeSource;

public static void main(String[] args) {          
    ProtectionDomain pd = StringUtils.class.getProtectionDomain();    
    CodeSource cs = pd.getCodeSource();    
    System.out.println(cs.getLocation());//输出jar包路径
}

输出结果：file:/D:/workspace/springtest/WebContent/WEB-INF/lib/commons-lang-2.4.jar