add char convert to unicode hex code

src/main/java/me/ehlxr/CharToHex.java

@@ -0,0 +1,59 @@
+package me.ehlxr;
+
+/**
+ * Created by lixiangrong on 2017/8/3.
+ */
+public class CharToHex {
+    private final static char[] hexArray = "0123456789ABCDEF".toCharArray();
+
+    public static void main(String[] args) throws Exception {
+        String hex = bytesToHex("彤".getBytes());
+        System.out.println(hex);
+
+        System.out.println(toUnicode("彤"));
+
+        // 十六进制 -> 十进制
+        int i = Integer.parseInt(hex, 16);
+        System.out.println(i);
+
+        // 十进制 -> 二进制
+        String bin = Integer.toBinaryString(i);
+        System.out.println(bin);
+
+        // 十进制 -> 十六进制
+        String hex1 = Integer.toHexString(i);
+        System.out.println(hex1);
+
+        // 十进制 -> 八进制
+        String oct = Integer.toOctalString(i);
+        System.out.println(oct);
+
+    }
+
+    /**
+     * 字符对应编码的哈希值
+     *
+     * @param bytes
+     * @return
+     */
+    public static String bytesToHex(byte[] bytes) {
+        char[] hexChars = new char[bytes.length * 2];
+        for (int j = 0; j < bytes.length; j++) {
+            int v = bytes[j] & 0xFF;
+            hexChars[j * 2] = hexArray[v >>> 4];
+            hexChars[j * 2 + 1] = hexArray[v & 0x0F];
+        }
+        return new String(hexChars);
+    }
+
+    public static String toUnicode(String s) {
+        String as[] = new String[s.length()];
+        StringBuilder s1 = new StringBuilder();
+        for (int i = 0; i < s.length(); i++) {
+            as[i] = Integer.toHexString(s.charAt(i) & 0xffff);
+            s1.append("\\u").append(as[i]);
+        }
+        return s1.toString();
+    }
+
+}