Java URI 不是绝对的吗？
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URI is not absolute?
提问by Grim
I have a File
我有一个文件
/user/guest/work/test/src/main/java/Test.java
And a File-Object:
和一个文件对象：
File f = new File("/user/guest/work/test/src/main/java/Test.java");
I need this outputs
我需要这个输出
System.out.println(f); -> src/main/java/Test.java
System.out.println(f.getAbsolutePath()); -> /user/guest/work/test/src/main/java/Test.java
I tried:
我试过：
File relativeTo = new File("/user/guest/work/test");
new File(relativeTo.toURI().relativize(f.toURI()));
but it is throwing a
但它正在抛出一个
java.lang.IllegalArgumentException: URI is not absolute
at java.io.File.<init>(File.java:416)
at Test.<init>(Test.java:43)
How to get the required output?
如何获得所需的输出？
采纳答案by OneCricketeer
relativizereturns a URI.
relativize返回一个 URI。
a new File(URI uri)takes...
一个new File(URI uri)需要...
uri - An absolute, hierarchical URI
uri -绝对的分层 URI
You can instead try using the String constructor.
您可以改为尝试使用 String 构造函数。
new File(relativeTo.toURI().relativize(f.toURI()).toString());
You have access to that file other ways, however
但是，您可以通过其他方式访问该文件
For example, you can try going through the java.nio.file.PathAPI instead of java.io.File
例如，您可以尝试通过java.nio.file.PathAPI 而不是java.io.File
Like
喜欢
Path path = Paths.get("/", "user", "guest", "workspace",
"test", "src", "main", "java", "Test.java");
Path other = ...
Path relPath = other.relativize(path);
// relPath.toString(); // print it
// relPath.toFile(); // get a file
回答by Pulkit
You can use path resolve to relativize file paths
您可以使用路径解析来相对化文件路径
File f = new File("/user/guest/workspace/test/src/main/java/Test.java");
File relativeTo = new File("/user/guest/workspace/test");
System.out.println(new File(relativeTo.toPath().resolve(f.toPath()).toUri()));
