auto close the handle after buffer loaded

binding/java/ReadMe.md

@@ -7,7 +7,7 @@
 <dependency>
     <groupId>org.lionsoul</groupId>
     <artifactId>ip2region</artifactId>
-    <version>2.6.4</version>
+    <version>2.6.5</version>
 </dependency>
 ```
 
@@ -41,7 +41,10 @@ public class SearcherTest {
             System.out.printf("failed to search(%s): %s\n", ip, e);
         }
 
-        // 3、备注：并发使用，每个线程需要创建一个独立的 searcher 对象单独使用。
+        // 3、关闭资源
+        searcher.close();
+        
+        // 备注：并发使用，每个线程需要创建一个独立的 searcher 对象单独使用。
     }
 }
 ```
@@ -86,6 +89,9 @@ public class SearcherTest {
         } catch (Exception e) {
             System.out.printf("failed to search(%s): %s\n", ip, e);
         }
+        
+        // 4、关闭资源
+        searcher.close();
 
         // 备注：每个线程需要单独创建一个独立的 Searcher 对象，但是都共享全局的制度 vIndex 缓存。
     }
@@ -132,6 +138,9 @@ public class SearcherTest {
         } catch (Exception e) {
             System.out.printf("failed to search(%s): %s\n", ip, e);
         }
+        
+        // 4、关闭资源 - 该 searcher 对象可以安全用于并发，等整个服务关闭的时候再关闭 searcher
+        // searcher.close();
 
         // 备注：并发使用，用整个 xdb 数据缓存创建的查询对象可以安全的用于并发，也就是你可以把这个 searcher 对象做成全局对象去跨线程访问。
     }

binding/java/pom.xml

@@ -4,7 +4,7 @@
 
     <groupId>org.lionsoul</groupId>
     <artifactId>ip2region</artifactId>
-    <version>2.6.4</version>
+    <version>2.6.5</version>
     <packaging>jar</packaging>
 
     <name>ip2region</name>

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

@@ -167,8 +167,10 @@ public class Searcher {
     }
 
     public static Header loadHeaderFromFile(String dbPath) throws IOException {
-        RandomAccessFile handle = new RandomAccessFile(dbPath, "r");
-        return loadHeader(handle);
+        final RandomAccessFile handle = new RandomAccessFile(dbPath, "r");
+        final Header header = loadHeader(handle);
+        handle.close();
+        return header;
     }
 
     public static byte[] loadVectorIndex(RandomAccessFile handle) throws IOException {
@@ -184,8 +186,10 @@ public class Searcher {
     }
 
     public static byte[] loadVectorIndexFromFile(String dbPath) throws IOException {
-        RandomAccessFile handle = new RandomAccessFile(dbPath, "r");
-        return loadVectorIndex(handle);
+        final RandomAccessFile handle = new RandomAccessFile(dbPath, "r");
+        final byte[] vIndex = loadVectorIndex(handle);
+        handle.close();
+        return vIndex;
     }
 
     public static byte[] loadContent(RandomAccessFile handle) throws IOException {
@@ -200,8 +204,10 @@ public class Searcher {
     }
 
     public static byte[] loadContentFromFile(String dbPath) throws IOException {
-        RandomAccessFile handle = new RandomAccessFile(dbPath, "r");
-        return loadContent(handle);
+        final RandomAccessFile handle = new RandomAccessFile(dbPath, "r");
+        final byte[] content = loadContent(handle);
+        handle.close();
+        return content;
     }
 
     // --- End cache load util function