StringBuffer给定初始值, 避免内存溢出

data-base/base-sync-amazon-ad/src/main/java/com/bailuntec/job/AmazonAdProductJob.java

@@ -181,8 +181,7 @@ public class AmazonAdProductJob extends PointJob {
                     gzin = new GZIPInputStream(response.body().byteStream());
                     isr = new InputStreamReader(gzin, "utf8");
                     bufferedReader = new BufferedReader(isr);
-
-                    StringBuffer sb = new StringBuffer();
+                    StringBuffer sb = new StringBuffer((int) response.body().contentLength() * 2);
                     String str = null;
                     while ((str = bufferedReader.readLine()) != null) {
                         sb.append(str);