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How to determine whether a file exists in java

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Release: 2019-11-19 13:13:56
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How to determine whether a file exists in java

可以使用Java的文件类方法exists(),它可以测试给定的路径名表示的文件或目录是否存在。如果存在的话返回“true”,否则就是返回“false”。        (推荐学习:java课程

Java文件类以抽象的方式代表文件名和目录路径名。该类主要用于文件和目录的创建、文件的查找和文件的删除等。

public boolean exists()
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测试此抽象路径名表示的文件或目录是否存在。

实例:

String filePth= "D:\\bh\\key\\rsa_public_key.pem";
File file = new File(filePth);
if(!file.exists()){
	// 文件不存在
	throw new RuntimeException("文件不存在,请联系管理员");
}
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