Java 如何使用FileOutputStream写入图像

我想知道如何使用

FileOutputStream

编写图像，因为

FileOutputStream

用于像image这样的字节数据，视频和音频对于文本数据来说，使用

FileReader

和

FileWriter

更好、更充分，所以我想做的是我有一个img.png文件，我可以使用

FileInputStream fin=new FileInputStream(new File("C:\\Folder1\\img.png"));

然后使用

read

方法读取，当时我想使用

FileOutputStream fout=new FileOutputStream(new File("C:\\Folder1\\newimg.png"));

然后用

fout.write写入它们，但是当我这样做的时候，图像被创建了，但是看不见，它的大小是以字节为单位的

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package fileinputstreamexample;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
/**
 *
 * @author Love Poet
 */
public class FileInputStreamExample {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws FileNotFoundException, IOException {
        // TODO code application logic here
        FileOutputStream fout = null;
        FileInputStream fin=new FileInputStream(new File("C:\\Folder1\\img.png"));
        int i;
        while((i=fin.read())!=-1)
        {
            fout=new FileOutputStream(new File("C:\\Folder1\\newimg.png"));
            fout.write(i);
            fout.flush();
        }
        System.out.println("File readed Succesfully");
        System.out.println("File Written Succesfully");
        fout.close();
        fin.close();
    }

}

只需将文件打开到循环外部即可

而不是

while((i=fin.read())!=-1)
        {
            fout=new FileOutputStream(new File("C:\\Folder1\\newimg.png"));
            fout.write(i);
            fout.flush();
        }

这样做

fout=new FileOutputStream(new File("C:\\Folder1\\newimg.png"));
while((i=fin.read())!=-1)
        {
            fout.write(i);
            # flush inside loop only if the chunks u r reading are HUGE, and u want+accomodate to partial flush.
        }
       fout.flush();

希望这对您为每个字节输入重新创建文件有所帮助

与目前发布的所有字节解决方案相比，以下解决方案的效率要高得多：

FileInputStream fin=new FileInputStream(new File("C:\\Folder1\\img.png")); 
FileOutputStream fout=new FileOutputStream(new File("C:\\Folder1\\newimg.png"));

int count;
byte[] buffer = new byte[8192]; // or more if you like
while ((count = fin.read(buffer)) != -1) {
    fout.write(buffer, 0, count);
}

//尝试使用在word文件中添加图像-

    XWPFDocument document = new XWPFDocument();
    XWPFParagraph paragraph = document.createParagraph();
    XWPFRun run = paragraph.createRun();


    run.addBreak();
    run.setText("Name File-test" );
    run.addBreak();


    String image;
    String testpath;
    File file = new File("Path\\Images\\");
    File[] files = file.listFiles();
    for (File f : files) {
        int format = Document.PICTURE_TYPE_JPEG;

        if (f.getName().endsWith(".png")) {
            image = f.getName();
            testpath = f.getAbsolutePath();
            // System.out.println(testpath);
            // System.out.println(image);
            run.addBreak();
            run.setText(image);
            run.addBreak();
            run.addPicture(new FileInputStream(testpath), format, testpath, Units.toEMU(400), Units.toEMU(500));
        }
    }
   FileOutputStream wordDoc =
        new FileOutputStream("Path- .docx");
    document.write(wordDoc);
    wordDoc.close();

发布完整的代码，你在哪里读写我没问题，我发现我的错误很好，谢谢你的努力，我的错误是我在循环中一次又一次地创建新图像：-）我的代码一天比一天增加非常好：-p不要在循环中刷新。
FileInputStream fin=new FileInputStream(new File("C:\\Folder1\\img.png")); 
FileOutputStream fout=new FileOutputStream(new File("C:\\Folder1\\newimg.png"));

int count;
byte[] buffer = new byte[8192]; // or more if you like
while ((count = fin.read(buffer)) != -1) {
    fout.write(buffer, 0, count);
}

    XWPFDocument document = new XWPFDocument();
    XWPFParagraph paragraph = document.createParagraph();
    XWPFRun run = paragraph.createRun();


    run.addBreak();
    run.setText("Name File-test" );
    run.addBreak();


    String image;
    String testpath;
    File file = new File("Path\\Images\\");
    File[] files = file.listFiles();
    for (File f : files) {
        int format = Document.PICTURE_TYPE_JPEG;

        if (f.getName().endsWith(".png")) {
            image = f.getName();
            testpath = f.getAbsolutePath();
            // System.out.println(testpath);
            // System.out.println(image);
            run.addBreak();
            run.setText(image);
            run.addBreak();
            run.addPicture(new FileInputStream(testpath), format, testpath, Units.toEMU(400), Units.toEMU(500));
        }
    }
   FileOutputStream wordDoc =
        new FileOutputStream("Path- .docx");
    document.write(wordDoc);
    wordDoc.close();