How do I read / convert an InputStream into a String in Java?

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You can read and convert an InputStream into a String in Java using various approaches. One common way is to use the java.io.BufferedReader class to read the stream line by line and then concatenate the lines into a String. Here's an example:

java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class InputStreamToStringExample {

    public static String convertInputStreamToString(InputStream inputStream) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
        StringBuilder stringBuilder = new StringBuilder();
        String line;
        
        while ((line = reader.readLine()) != null) {
            stringBuilder.append(line).append("\n");
        }
        
        reader.close();
        return stringBuilder.toString();
    }

    public static void main(String[] args) throws IOException {
        // Example InputStream (you can replace this with your actual InputStream)
        InputStream inputStream = InputStreamToStringExample.class.getResourceAsStream("/example.txt");

        String result = convertInputStreamToString(inputStream);
        System.out.println(result);
    }
}

In this example:

  • The convertInputStreamToString method takes an InputStream as an argument and uses a BufferedReader to read each line from the stream and append it to a StringBuilder.
  • The InputStreamToStringExample class demonstrates how to convert an example InputStream (you can replace it with your own) into a String.
  • Remember to replace "/example.txt" with the path to your actual input stream.

This approach reads the input stream line by line and concatenates the lines using newline characters, effectively converting the stream into a String.

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