duplicate code improvement

Author: Parachuteuk

framework/src/main/java/org/tron/core/services/http/GetBlockByLatestNumServlet.java

@@ -23,14 +23,7 @@ protected void doGet(HttpServletRequest request, HttpServletResponse response) {
     try {
       boolean visible = Util.getVisible(request);
       long getNum = Long.parseLong(request.getParameter("num"));
-      if (getNum > 0 && getNum < BLOCK_LIMIT_NUM) {
-        BlockList reply = wallet.getBlockByLatestNum(getNum);
-        if (reply != null) {
-          response.getWriter().println(Util.printBlockList(reply, visible));
-          return;
-        }
-      }
-      response.getWriter().println("{}");
+      outWrite(getNum, visible, response);
     } catch (Exception e) {
       Util.processError(e, response);
     }
@@ -45,16 +38,25 @@ protected void doPost(HttpServletRequest request, HttpServletResponse response)
       NumberMessage.Builder build = NumberMessage.newBuilder();
       JsonFormat.merge(input, build, visible);
       long getNum = build.getNum();
-      if (getNum > 0 && getNum < BLOCK_LIMIT_NUM) {
-        BlockList reply = wallet.getBlockByLatestNum(getNum);
-        if (reply != null) {
-          response.getWriter().println(Util.printBlockList(reply, visible));
-          return;
-        }
-      }
-      response.getWriter().println("{}");
+      outWrite(getNum, visible, response);
     } catch (Exception e) {
       Util.processError(e, response);
     }
   }
+
+  private void outWrite(long getNum, boolean visible, HttpServletResponse response) throws Exception {
+    if (getNum > 0 && getNum < BLOCK_LIMIT_NUM) {
+      BlockList reply = wallet.getBlockByLatestNum(getNum);
+      if (reply != null) {
+        response.getWriter().println(Util.printBlockList(reply, visible));
+        return;
+      }
+      else {
+        response.getWriter().println("{}");
+      }
+    }else {
+      response.getWriter().println("{}");
+    }
+  }
+
 }