Fix announcement display

src/main/java/emu/grasscutter/server/dispatch/AnnouncementHandler.java

@@ -0,0 +1,35 @@
+package emu.grasscutter.server.dispatch;
+
+import emu.grasscutter.Grasscutter;
+import express.http.HttpContextHandler;
+import express.http.Request;
+import express.http.Response;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.util.Objects;
+
+public final class AnnouncementHandler implements HttpContextHandler {
+    @Override
+    public void handle(Request request, Response response) throws IOException {//event
+        if (Objects.equals(request.baseUrl(), "/common/hk4e_global/announcement/api/getAnnContent")) {
+            response.send("{\"retcode\":0,\"message\":\"OK\",\"data\":" + readToString(new File(Grasscutter.getConfig().DATA_FOLDER + "GameAnnouncement.json")) +"}");
+        } else if (Objects.equals(request.baseUrl(), "/common/hk4e_global/announcement/api/getAnnList")) {
+            String data = readToString(new File(Grasscutter.getConfig().DATA_FOLDER + "GameAnnouncementList.json")).replace("System.currentTimeMillis()",String.valueOf(System.currentTimeMillis()));
+            response.send("{\"retcode\":0,\"message\":\"OK\",\"data\": "+data +"}");
+        }
+    }
+    private static String readToString(File file) {
+        Long filelength = file.length();
+        byte[] filecontent = new byte[filelength.intValue()];
+        try {
+            FileInputStream in = new FileInputStream(file);
+            in.read(filecontent);
+            in.close();
+        } catch (IOException fileNotFoundException) {
+            fileNotFoundException.printStackTrace();
+        }
+        return new String(filecontent);
+    }
+}