以下是一些将InputStream转换为File Java示例

手动将InputStream复制到FileOutputStream

Apache Commons IO – FileUtils.copyInputStreamToFile

Java 1.7 NIO Files.copy

1. FileOutputStream

1.1我们必须将数据从InputStream手动复制到OutputStream 。

InputStreamToFile.java

package com.mkyong;



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在Apache Commons IO中可用

pom.xml

	commons-io
	commons-io
	2.6
/pre>
p>InputStreamToFile2.java
/p>
pre class='language-javascript'>
package com.mkyong;



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);

        }



    }



}
/pre>
h3>3. Java 1.7 NIO
/h3>
p>3.1如果只想将inputStream保存到某个文件中，请尝试使用Java 1.7 NIO Files.copy
/p>
p>InputStreamToFile3.java
/p>
pre class='language-javascript'>
package com.mkyong;



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));



        }



    }



}
/pre>
h3>4.旧时光
/h3>
p>4.1在过去的Java 1.7之前，我们必须手动关闭所有资源。
/p>
p>InputStreamToFile4.java
/p>
pre class='language-javascript'>
package com.mkyong;



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/mkyong/holder.js");



            // write the inputStream to a FileOutputStream

            outputStream = new FileOutputStream(new File("/Users/mkyong/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();

                }



            }

        }

    }



}
/pre>
h3>5.将文件转换为InputStream
/h3>
p>这很容易：
/p>
pre class='language-javascript'>
File file = new File("d:\\download\\google.txt");

    InputStream inputStream = new FileInputStream(file);
/pre>
blockquote>注意

您可能对此String的InputStream感兴趣
/blockquote>
h3>参考文献
/h3>
p>文件JavaDocs
/p>
p>如何在Java中将InputStream转换为String
/p>
p>Apache Commons IO
/p>
blockquote>翻译自: https://mkyong.com/java/how-to-convert-inputstream-to-file-in-java/
/blockquote>