fix: 修正读取类型

src/main/java/com/xydl/cac/model/spectrogram/SouthYsp.java

@@ -12,7 +12,7 @@ public class SouthYsp extends SpectrogramModel {
     Float fileVersion;
     Short type;
     Long createTime;
-    Integer flag;
+    String flag;
     String name;
     Float xInterval;
     Float yMax;
@@ -27,7 +27,7 @@ public class SouthYsp extends SpectrogramModel {
         fileVersion = readLittleEndianFloat(dis);
         type = readLittleEndianShort(dis);
         createTime = readLittleEndianLong(dis);
-        flag = dis.read();
+        flag = readString(dis, 1);
         name = readString(dis, 32);
         xInterval = readLittleEndianFloat(dis);
         yMax = readLittleEndianFloat(dis);