java FileInputStream 使用包路径
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FileInputStream using package path
提问by Krishna
I am trying to read a file like :
我正在尝试读取如下文件：
FileInputStream fileInputStream = new FileInputStream("/com/test/Test.xml");
I am always getting the file not found exception. How can i make it work? Will the inputstream takes the relative path or not?
我总是收到找不到文件的异常。我怎样才能让它工作？输入流是否会采用相对路径？
回答by AlexR
Yes, this can take relative path.
是的，这可以采取相对路径。
Why your expression does not work? Very simple: your path /com/test/Test.xmlis absolute because it starts with /, so you are actually looking for file located in /com/test/directory starting from root.
为什么你的表达不起作用？非常简单：您的路径/com/test/Test.xml是绝对路径，因为它以 开头/，因此您实际上是在/com/test/从根目录开始查找位于目录中的文件。
How to solve the problem?
如何解决问题？
I believe that you are trying to find file located under your project. So, you can use relative path like ./com/test/Test.xmlor com/test/Test.xml. This will probably help. Probably because I do not know what is your current working directory and your file structure. Your current directory is where you are located when running java. If you are running from IDE typically the working directory is your project directory.
我相信您正在尝试查找位于您的项目下的文件。因此，您可以使用相对路径，例如./com/test/Test.xml或com/test/Test.xml。这可能会有所帮助。可能是因为我不知道您当前的工作目录和文件结构是什么。您的当前目录是您在运行时所在的位置java。如果您从 IDE 运行，通常工作目录是您的项目目录。
In this case I believe that path ./com/test/Test.xmlis invalid because file Test.xmlis not located directly under project root but somewhere under ./src/resources/com/testor so.
在这种情况下，我认为路径./com/test/Test.xml无效，因为文件Test.xml不是直接位于项目根目录下，而是位于以下某处./src/resources/com/test。
In this case probably you do not want to read the file as a file but as a resource (located into your classpath). In this case use
在这种情况下，您可能不想将文件作为文件读取，而是作为资源（位于类路径中）读取。在这种情况下使用
getClass().getResourceAsStream("/com/test/Test.xml")
getClass().getResourceAsStream("/com/test/Test.xml")
回答by mprabhat
Try using
尝试使用
class.getResourceAsStream(path). In that case, path will have to be relative to the folder containing the class invoking this statement.
class.getResourceAsStream(path)。在这种情况下，路径必须相对于包含调用此语句的类的文件夹。
InputStream in = getClass().getResourceAsStream("/com/test/Test.xml");
回答by Kumar Vivek Mitra
Try this,
试试这个，
String str = "Test.xml";
File file = new File(str);
String absolutePathOfFirstFile = file.getAbsolutePath();
FileInputStream fileInputStream = new FileInputStream(absolutePathOfFirstFile);
回答by user845279
Your path must be incorrect. You can check the current directory by using System.getProperty("user.dir");or printing the path of new File(".")
您的路径一定不正确。您可以通过使用System.getProperty("user.dir");或打印路径来检查当前目录new File(".")
