文件使用完毕后关闭文件

binding/java/ReadMe.md

@@ -35,6 +35,8 @@ public class SearcherTest {
             String ip = "1.2.3.4";
             long sTime = System.nanoTime();
             String region = searcher.search(ip);
+            //一定关闭
+            searcher.close();
             long cost = TimeUnit.NANOSECONDS.toMicros((long) (System.nanoTime() - sTime));
             System.out.printf("{region: %s, ioCount: %d, took: %d μs}\n", region, searcher.getIOCount(), cost);
         } catch (Exception e) {
@@ -81,6 +83,7 @@ public class SearcherTest {
             String ip = "1.2.3.4";
             long sTime = System.nanoTime();
             String region = searcher.search(ip);
+            searcher.close();
             long cost = TimeUnit.NANOSECONDS.toMicros((long) (System.nanoTime() - sTime));
             System.out.printf("{region: %s, ioCount: %d, took: %d μs}\n", region, searcher.getIOCount(), cost);
         } catch (Exception e) {
@@ -127,6 +130,7 @@ public class SearcherTest {
             String ip = "1.2.3.4";
             long sTime = System.nanoTime();
             String region = searcher.search(ip);
+            //此处可以不调用 searcher.close() 因为使用了newWithBuffer没有打开文件
             long cost = TimeUnit.NANOSECONDS.toMicros((long) (System.nanoTime() - sTime));
             System.out.printf("{region: %s, ioCount: %d, took: %d μs}\n", region, searcher.getIOCount(), cost);
         } catch (Exception e) {

binding/java/src/main/java/org/lionsoul/ip2region/xdb/Searcher.java

@@ -163,6 +163,7 @@ public class Searcher {
         handle.seek(0);
         final byte[] buff = new byte[HeaderInfoLength];
         handle.read(buff);
+        handle.close();
         return new Header(buff);
     }
 
@@ -177,8 +178,10 @@ public class Searcher {
         final byte[] buff = new byte[len];
         int rLen = handle.read(buff);
         if (rLen != len) {
+            handle.close();
             throw new IOException("incomplete read: read bytes should be " + len);
         }
+        handle.close();
 
         return buff;
     }
@@ -193,9 +196,10 @@ public class Searcher {
         final byte[] buff =  new byte[(int) handle.length()];
         int rLen = handle.read(buff);
         if (rLen != buff.length) {
+            handle.close();
             throw new IOException("incomplete read: read bytes should be " + buff.length);
         }
-
+        handle.close();
         return buff;
     }