So konvertieren Sie InputStream in Java in eine Datei

So konvertieren Sie InputStream in eine Datei in Java

Im Folgenden finden Sie einige Java-Beispiele zum Konvertieren vonInputStream inFile

Kopieren SieInputStream manuell nachFileOutputStream
Apache Commons IO -FileUtils.copyInputStreamToFile
Java 1.7 NIOFiles.copy

1. FileOutputStream

1.1 We have to copy the data from InputStream into OutputStream manually.

InputStreamToFile.java

package com.example;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;

public class InputStreamToFile {

    private static final String FILE_TO = "d:\\download\\google.txt";

    public static void main(String[] args) throws IOException {

        URI u = URI.create("https://www.google.com/");
        try (InputStream inputStream = u.toURL().openStream()) {
            File file = new File(FILE_TO);
            copyInputStreamToFile(inputStream, file);
        }
    }

    // InputStream -> File
    private static void copyInputStreamToFile(InputStream inputStream, File file)
        throws IOException {

        try (FileOutputStream outputStream = new FileOutputStream(file)) {

            int read;
            byte[] bytes = new byte[1024];

            while ((read = inputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, read);
            }

            // commons-io
            //IOUtils.copy(inputStream, outputStream);

        }

    }

}

2. Apache Commons IO

2.1 FileUtils.copyInputStreamToFile is available in the Apache Commons IO

pom.xml

    
        commons-io
        commons-io
        2.6

InputStreamToFile2.java

package com.example;

import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;

public class InputStreamToFile2 {

    private static final String FILE_TO = "d:\\download\\google.txt";

    public static void main(String[] args) throws IOException {

        URI u = URI.create("https://www.google.com/");
        try (InputStream inputStream = u.toURL().openStream()) {

            File file = new File(FILE_TO);

            // commons-io
            FileUtils.copyInputStreamToFile(inputStream, file);
        }

    }

}

3. Java 1.7 NIO

3.1 If just want to save inputStream into a file somewhere, try the Java 1.7 NIO Files.copy

InputStreamToFile3.java

package com.example;

import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.nio.file.Files;
import java.nio.file.Paths;

public class InputStreamToFile3 {

    private static final String FILE_TO = "d:\\download\\google.txt";

    public static void main(String[] args) throws IOException {

        URI u = URI.create("https://www.google.com/");
        try (InputStream inputStream = u.toURL().openStream()) {

            //Java 1.7
            Files.copy(inputStream, Paths.get(FILE_TO));

        }

    }

}

4. Früher

4.1 In the old days, before Java 1.7, we have to close all resources manually.

InputStreamToFile4.java

package com.example;

import java.io.*;

public class InputStreamToFile4 {

    public static void main(String[] args) {

        InputStream inputStream = null;
        OutputStream outputStream = null;

        try {
            // read this file into InputStream
            inputStream = new FileInputStream("/Users/example/holder.js");

            // write the inputStream to a FileOutputStream
            outputStream = new FileOutputStream(new File("/Users/example/holder-new.js"));

            int read = 0;
            byte[] bytes = new byte[1024];

            while ((read = inputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, read);
            }

            System.out.println("Done!");

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (inputStream != null) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (outputStream != null) {
                try {
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        }
    }

}

5. Datei in InputStream konvertieren

Es ist sehr einfach:

    File file = new File("d:\\download\\google.txt");
    InputStream inputStream = new FileInputStream(file);

Note
Sie können an diesenInputStream to String interessiert sein

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