Question

使用Java：

我有一个代表文件的byte[]。

如何将其写入文件（即C:\myfile.pdf）

我知道它已经完成了InputStream，但我似乎无法解决它。

Answer 1

FileUtils.writeByteArrayToFile(new File("pathname"), myByteArray)

或者，如果你坚持为自己工作......

try (FileOutputStream fos = new FileOutputStream("pathname")) {
   fos.write(myByteArray);
   //fos.close(); There is no more need for this line since you had created the instance of "fos" inside the try. And this will automatically close the OutputStream
}

Answer 2

没有任何图书馆：

try (FileOutputStream stream = new FileOutputStream(path)) {
    stream.write(bytes);
}

使用Google Guava：

Files.write(bytes, new File(path));

使用Apache Commons：

FileUtils.writeByteArrayToFile(new File(path), bytes);

所有这些策略都要求您在某些时候捕获IOException。

Answer 3

使用java.nio.file的另一种解决方案：

byte[] bytes = ...;
Path path = Paths.get("C:\\myfile.pdf");
Files.write(path, bytes);

Answer 4

此外，自Java 7以来，一行包含java.nio.file.Files：

Files.write(new File(filePath).toPath(), data);

数据是你的byte []，filePath是String。您还可以使用StandardOpenOptions类添加多个文件打开选项。使用try / catch添加抛出或环绕。

Answer 5

从 Java 7 开始，您可以使用 try-with-resources 语句来避免资源泄漏并使代码更易于阅读。更多关于here。

要将byteArray写入您要执行的文件：

try (FileOutputStream fos = new FileOutputStream("fullPathToFile")) {
    fos.write(byteArray);
} catch (IOException ioe) {
    ioe.printStackTrace();
}

Answer 6

尝试使用OutputStream或更具体的FileOutputStream

Answer 7

我知道已经完成了InputStream

实际上，您writing只能file output ...

Answer 8

File f = new File(fileName);    
byte[] fileContent = msg.getByteSequenceContent();    

Path path = Paths.get(f.getAbsolutePath());
try {
    Files.write(path, fileContent);
} catch (IOException ex) {
    Logger.getLogger(Agent2.class.getName()).log(Level.SEVERE, null, ex);
}

Answer 9

基本示例：

String fileName = "file.test";

BufferedOutputStream bs = null;

try {

    FileOutputStream fs = new FileOutputStream(new File(fileName));
    bs = new BufferedOutputStream(fs);
    bs.write(byte_array);
    bs.close();
    bs = null;

} catch (Exception e) {
    e.printStackTrace()
}

if (bs != null) try { bs.close(); } catch (Exception e) {}

Answer 10

////////////////////////// 1]文件到字节[] ////////////// /////

Path path = Paths.get(p);
                    byte[] data = null;                         
                    try {
                        data = Files.readAllBytes(path);
                    } catch (IOException ex) {
                        Logger.getLogger(Agent1.class.getName()).log(Level.SEVERE, null, ex);
                    }

/////////////////////// 2] Byte [] to File ///////////////// //////////

 File f = new File(fileName);
 byte[] fileContent = msg.getByteSequenceContent();
Path path = Paths.get(f.getAbsolutePath());
                            try {
                                Files.write(path, fileContent);
                            } catch (IOException ex) {
                                Logger.getLogger(Agent2.class.getName()).log(Level.SEVERE, null, ex);
                            }

Answer 11

您可以尝试Cactoos：

new LengthOf(new TeeInput(array, new File("a.txt"))).value();

更多详情：http://www.yegor256.com/2017/06/22/object-oriented-input-output-in-cactoos.html

Answer 12

这是一个程序，我们使用String Builder读取和打印字节数组偏移量和长度，并将字节偏移长度数组写入新文件。

`在此输入代码

import java.io.File;   
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;        

//*This is a program where we are reading and printing array of bytes offset and length using StringBuilder and Writing the array of bytes offset length to the new file*//     

public class ReadandWriteAByte {
    public void readandWriteBytesToFile(){
        File file = new File("count.char"); //(abcdefghijk)
        File bfile = new File("bytefile.txt");//(New File)
        byte[] b;
        FileInputStream fis = null;              
        FileOutputStream fos = null;          

        try{               
            fis = new FileInputStream (file);           
            fos = new FileOutputStream (bfile);             
            b = new byte [1024];              
            int i;              
            StringBuilder sb = new StringBuilder();

            while ((i = fis.read(b))!=-1){                  
                sb.append(new String(b,5,5));               
                fos.write(b, 2, 5);               
            }               

            System.out.println(sb.toString());               
        }catch (IOException e) {                    
            e.printStackTrace();                
        }finally {               
            try {              
                if(fis != null);           
                    fis.close();    //This helps to close the stream          
            }catch (IOException e){           
                e.printStackTrace();              
            }            
        }               
    }               

    public static void main (String args[]){              
        ReadandWriteAByte rb = new ReadandWriteAByte();              
        rb.readandWriteBytesToFile();              
    }                 
}

控制台中的O / P：fghij

新文件中的O / P：cdefg

byte []以Java文件

12 个答案: