字节[]到Java文件 - 开卷题库

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最佳答案

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
}

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尝试OutputStream或更具体地FileOutputStream

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我知道它是用InputStream完成的

实际上，你会从写作到文件输出…

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基本的例子:

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) {}

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没有任何库:

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

谷歌番石榴:

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

Apache Commons:

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

所有这些策略都要求您在某个时刻捕获IOException。

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从Java 7开始，你可以使用try-with-resources语句来避免资源泄漏，并使你的代码更容易阅读。更多关于在这里。

要将byteArray写入文件，你需要:

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

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另一个使用java.nio.file的解决方案:

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

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同样从Java 7开始，一行Java .nio.file. files:

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

其中data是字节[]，filePath是字符串。您还可以使用StandardOpenOptions类添加多个文件打开选项。添加投掷或环绕尝试/接。

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这是一个程序，我们正在读取和打印数组的字节偏移量和长度使用String Builder和写入数组的字节偏移量长度到新文件。

“在这里输入代码

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();
}
}

O/P在控制台:fghij

O/P在新文件:cdefg

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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);
}

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////////////////////////// 1)文件字节 [] ///////////////////

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[]文件 ///////////////////////////

 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);
}

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你可以尝试Cactoos:

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