Yes, you can do this in one line (though for robust IOException
handling you wouldn't want to).
String content = new Scanner(new File("filename")).useDelimiter("\Z").next();
System.out.println(content);
This uses a java.util.Scanner
, telling it to delimit the input with
, which is the end of the string anchor. This ultimately makes the input have one actual token, which is the entire file, so it can be read with one call to next()
.
There is a constructor that takes a File
and a String charSetName
(among many other overloads). These two constructor may throw FileNotFoundException
, but like all Scanner
methods, no IOException
can be thrown beyond these constructors.
You can query the Scanner
itself through the ioException()
method if an IOException
occurred or not. You may also want to explicitly close()
the Scanner
after you read the content, so perhaps storing the Scanner
reference in a local variable is best.
See also
Related questions
Third-party library options
For completeness, these are some really good options if you have these very reputable and highly useful third party libraries:
com.google.common.io.Files
contains many useful methods. The pertinent ones here are:
org.apache.commons.io.IOUtils
also offer similar functionality:
String toString(InputStream, String encoding)
- Using the specified character encoding, gets the contents of an
InputStream
as a String
List readLines(InputStream, String encoding)
- ... as a (raw)
List
of String
, one entry per line
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