与Java:
我有一个字节[],代表一个文件。
我如何写这个文件(即。C: \ myfile.pdf)
我知道它是用InputStream完成的,但我似乎无法解决它。
与Java:
我有一个字节[],代表一个文件。
我如何写这个文件(即。C: \ myfile.pdf)
我知道它是用InputStream完成的,但我似乎无法解决它。
当前回答
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
其他回答
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);
}
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) {}
尝试OutputStream或者更具体地说FileOutputStream
使用Apache Commons IO
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
}
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));
使用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。