解决 elasticsearch ik analyzer access denied “java.io.FilePermission”

今天在使用 elasticsearch 的中文分词时，遇到了 access denied 问题。抛出的异常大概是 java.io.FilePermission，即权限问题。整个异常信息如下：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'blogController': Unsatisfied dependency expressed through field 'esBlogService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'esBlogServiceImpl': Unsatisfied dependency expressed through field 'esBlogRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'esBlogRepository': Invocation of init method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.elasticsearch.repository.support.SimpleElasticsearchRepository]: Constructor threw exception; nested exception is java.lang.SecurityException: access denied ("java.io.FilePermission" "D:/Program%20Files/elasticsearch-6.2.4/plugins/analysis-ik/config/IKAnalyzer.cfg.xml" "read")

从异常提示信息上看是权限问题，就是说 IKAnalyzer.cfg.xml 这个文件，java 程序只有读取权限，而对于 IKAnalyzer.cfg.xml 文件，elasticsearch 程序代码可能还需求其他一些权限，所以不能只有读权限。

然后我对 IKAnalyzer.cfg.xml 文件设置了非只读属性后，发现马上又变成了只读属性。最终原因是因为 D:/Program Files文件夹下的都是默认的只读权限。我把 elasticsearch-6.2.4 直接放在 D 盘然后重启 elasticsearch 后，程序就不在出这个错误了。

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