使用 Java 将字节[]数组转换为文件
原文:https://www . geesforgeks . org/convert-byte-array-to-file-using-Java/
要将字节[]转换为文件 使用 String 类的 getBytes() 方法，简单的 write() 方法可以将该字节转换为文件。
程序 1: 将字符串转换为字节[]并写入文件。
// Java Program to convert
// byte array to file
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
public class GFG {
// Path of a file
static String FILEPATH = "";
static File file = new File(FILEPATH);
// Method which write the bytes into a file
static void writeByte(byte[] bytes)
{
try {
// Initialize a pointer
// in file using OutputStream
OutputStream
os
= new FileOutputStream(file);
// Starts writing the bytes in it
os.write(bytes);
System.out.println("Successfully"
+ " byte inserted");
// Close the file
os.close();
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
// Driver Code
public static void main(String args[])
{
String string = "GeeksForGeeks"
+ " - A Computer Science"
+ " Portal for geeks";
// Get byte array from string
byte[] bytes = string.getBytes();
// Convert byte array to file
writeByte(bytes);
}
}
输出:
Successfully byte inserted
程序 2: 在文件中写入整数、双精度、字符值(使用包装类)。
// Java Program to convert
// int, char and double into bytes
// and write it in a file
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
public class GFG {
// Path of a file
static String FILEPATH = "";
static File file = new File(FILEPATH);
// Method which write the bytes into a file
static void writeByte(byte[] byteInt,
byte[] byteChar, byte[] byteDouble)
{
try {
// Initialize a pointer in file using OutputStream
OutputStream os = new FileOutputStream(file);
// Starts writing the bytes in it
// Write int value
os.write(byteInt);
// Write char value
os.write(byteChar);
// Write double value
os.write(byteDouble);
System.out.println("Successfully byte inserted");
// Close the file
os.close();
}
catch (Exception e) {
System.out.println("Exception: " + e);
}
}
// Driver Code
public static void main(String args[])
{
int num = 56;
char ch = 's';
double dec = 78.9;
// Insert int value
byte[] byteInt = Integer.toString(num).getBytes();
// Insert char value
byte[] byteChar = Character.toString(ch).getBytes();
// Insert double value
byte[] byteDouble = Double.toString(dec).getBytes();
writeByte(byteInt, byteChar, byteDouble);
}
}
输出:
Successfully byte inserted
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