String example = "This is an example";
// ----------String to byte[]-----------------
// 默认都是UTF-8
// byte[] bytes = example.getBytes("UTF-8");
// 也能像下面这样写。StandardCharsets类里定义了一些静态常量指定编码格式。
// byte[] bytes = example.getBytes(StandardCharsets.UTF_8);
byte[] bytes = example.getBytes();
// [B@7ea987ac
System.out.println(bytes);
// ----------byte[] to String-----------------
// 字节数组转换为String的时候可以设置下编码，默认转换的时候是 UTF-8 编码
// String s = new String(bytes);
String s = new String(bytes, "UTF-8");
System.out.println(s);
// toString默认打印出来的只是
// getClass().getName() + "@" + Integer.toHexString(hashCode());
// [B@7ea987ac
System.out.println(bytes.toString());
// [84, 104, 105, 115, 32, 105, 115, 32, 97, 110, 32, 101, 120, 97, 109, 112, 108, 101]
System.out.println(Arrays.toString(bytes));
Array.toString() 方法，其实就是一个个打印数组的元素
// Arrays.java JDK1.8
public static String toString(byte[] a) {
if (a == null)
return "null";
int iMax = a.length - 1;
if (iMax == -1)
return "[]";
StringBuilder b = new StringBuilder();
b.append('[');
for (int i = 0; ; i++) {
b.append(a[i]);
if (i == iMax)
return b.append(']').toString();
b.append(", ");
}
}
byte[] 比较
public static int compareByteArray(byte[] arr1, byte[] arr2) {
int ret = 0;
if (arr1.length != arr2.length) {
ret = arr1.length - arr2.length;
} else {
for (int i = 0; i < arr1.length; i++) {
if (arr1[i] != arr2[i]) {
ret = arr1[i] - arr2[i];
break;
}
}
}
return ret;
}
参考
- https://www.mkyong.com/java/how-do-convert-byte-array-to-string-in-java/
- https://www.journaldev.com/770/string-byte-array-java
