fix：gamma自动处理lc等文件保存至ftp目录下之后 删除临时文件

jeecg-boot-base-core/src/main/java/org/jeecg/common/util/GammaReportUtil.java

@@ -19,7 +19,7 @@ public class GammaReportUtil {
         // 获取系统的临时目录
         String tempDir = System.getProperty("java.io.tmpdir");
         // 创建文件
-        File file = new File(tempDir += System.currentTimeMillis());
+        File file = new File(tempDir + System.currentTimeMillis());
         // 创建PrintWriter对象
         PrintWriter out = null;
         try {
@@ -54,6 +54,7 @@ public class GammaReportUtil {
             if (null != out) {
                 out.close();
             }
+            file.delete();
         }
     }
     public static void writeFile(List<Double> data, String fileType, String path){
@@ -79,6 +80,7 @@ public class GammaReportUtil {
             if (null != out) {
                 out.close();
             }
+            file.delete();
         }
     }