base64 \r\r\n解决

src/main/java/com/educoder/bridge/common/utils/Base64Util.java

@@ -44,10 +44,35 @@ public class Base64Util {
      * @return
      */
     public static String reencode(String code) {
-        String str = decode(code);
-        str = str.replace("\n", "\r\n");
-        return encode(str);
-    }
+		String str = decode(code);
+		//str = str.replace("\n", "\r\n");
+		str = replaceLineFeed(str);
+		return encode(str);
+	}
+	
+	private static String replaceLineFeed(String str) {
+		StringBuilder sb = new StringBuilder();
+		char[] cs = str.toCharArray();
+		int len = cs.length;
+		for (int i = 0; i < len; i++) {
+			char c = cs[i];
+			if (c == '\n') {
+				if (i == 0) {
+					sb.append('\r').append(c);
+				} else {
+					char pre = cs[i - 1];
+					if (pre == '\r') {
+						sb.append(c);
+					} else {
+						sb.append('\r').append(c);
+					}
+				}
+			} else {
+				sb.append(c);
+			}
+		}
+		return sb.toString();
+	}
 
     /**
      * 正常编码