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An ultimate case study to combine dbt data transformation at scale
Writing real world application code in java involves file and string processing. Some of the common use cases to convert a file to string are as follows.
There are numerous other use cases for this. So given the huge number of applications, in this tutorial we will discuss 5 simple and handpicked ways to read or convert a file into a String in Java. Depending upon your project configuration, you can use any of the following methods.
import java.nio.file.Files;
import java.nio.file.Path;
String result = Files.readString(Path.of("filePath"));
//To Write string to a file you can use
String content = "Demo Content";
Files.writeString(filePath, content);
This method works with Java 1.11+
String result = new String(Files.readAllBytes(Paths.get(filePath)), StandardCharsets.UTF_8);
This method works with Java 1.8+
try (Scanner scanner = new Scanner(Paths.get(fileName), StandardCharsets.UTF_8.name())) {
String result = scanner.useDelimiter("\\A").next();
}
Note that "\A" represents regex pattern for useDelimiter scanner method. "\A" stands for :start of a string! . So when this pattern is supplied, whole stream is ready into the scanner object.
File file = new File("data.txt");
String result = FileUtils.readFileToString(file, StandardCharsets.UTF_8);
For this method, Apache commons-io library should be included into your project. You can include it with this maven link
String result = Files.toString(new File(path), Charsets.UTF_8);
For this method, Guava library should be included into your project. You can include it with this maven link
If you want to play around with actual InputStreams without any utility methods you can use the above style.
What's next: How to read or convert an inputstream into a string in java
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If you feel there are any other better ways to convert the streams or if you have any questions please comment below.
As a bonus here is a simple tech tip to increase your productivity.