緩沖讀取器或輸入流讀取器中的gc開銷

Question

{
    Connection connection;
    ZipFile zipFile = null;
    InputStream inputStream = null;
    BufferedReader bufferedReader = null;
    try {
        connection = ConnectionManager.getConnection();
        zipFile = new ZipFile(fileUpload);
        Enumeration<? extends ZipEntry> entries = zipFile.entries();
        ZipEntry entry;
        String line = "";
        DBBridge dbBridge = new DBBridge();
        while (entries.hasMoreElements()) {
            entry = entries.nextElement();
            boolean firstLineSkipped = false;
            boolean insertStockFlag = false;
            inputStream = zipFile.getInputStream(entry);
            Reader reader = new InputStreamReader(inputStream,"UTF-8");
            bufferedReader = new BufferedReader(reader);
            while ((line = bufferedReader.readLine()) != null) {
                String[] stockData = line.split(",");
                if (firstLineSkipped && !insertStockFlag){ 
                    dbBridge.insertStockSP(connection, stockData[0], stockData[11], stockData[12], stockData[13]);
                    insertStockFlag = true;
                }
                if(firstLineSkipped && insertStockFlag) {
                    dbBridge.insertStockDailyInfo(connection, stockData[0], stockData[1], stockData[2], stockData[3], stockData[4], stockData[5], stockData[6], stockData[7], stockData[8], stockData[9], stockData[10], stockData[14]);
                }
                firstLineSkipped = true;
            }
            reader.close();
            reader = null;
            bufferedReader.close();
            bufferedReader = null;
        }
        return SUCCESS;
    } catch (FileLockInterruptionException e) {
        return ERROR;
    } catch (IOException e) {
        return ERROR;
    } catch (ClassNotFoundException e) {
        return ERROR;
    } catch (SQLException e) {
        return ERROR;
    } catch (Exception e) {
        return ERROR;
    } finally {
        try {
            if (zipFile != null){
                zipFile.close();
                zipFile = null;
            }
            if (inputStream != null){
                inputStream.close();
                inputStream = null;
            }
            if (bufferedReader != null){
                bufferedReader.close();
                bufferedReader = null;
            }
        } catch (IOException e) {
            /* e.printStackTrace(); */
        }
    }
}

這是我在zip文件中導入某些csv文件的方法，但是我面臨gc超出開銷限制的問題。 問題是由inputstreamreader的bufferedreader引起的嗎？ 我能做什么？ 是什么導致此錯誤？

編輯：這是我的insertStockSP在DBBridge

    public void insertStockSP(Connection connection,String symbolName, String Code, String latinName, String persianName) throws SQLException {
    CallableStatement proc = connection.prepareCall("{call insertStock(?,?,?,?)}");
    proc.setString(1, symbolName);
    proc.setString(2, Code);
    proc.setString(3, latinName);
    proc.setString(4, persianName);
    proc.execute();
}

我不認為這是問題。 insertStockDailyInfo就是這樣。

Exception in thread "ContainerBackgroundProcessor[StandardEngine[Catalina]]" java.lang.OutOfMemoryError: GC overhead limit exceeded
at java.lang.AbstractStringBuilder.<init>(AbstractStringBuilder.java:64)
at java.lang.StringBuffer.<init>(StringBuffer.java:108)
at java.io.Win32FileSystem.normalize(Win32FileSystem.java:122)
at java.io.Win32FileSystem.normalize(Win32FileSystem.java:189)
at java.io.File.<init>(File.java:367)
at org.apache.naming.resources.FileDirContext.file(FileDirContext.java:765)
at org.apache.naming.resources.FileDirContext.doGetAttributes(FileDirContext.java:398)
at org.apache.naming.resources.BaseDirContext.getAttributes(BaseDirContext.java:1137)
at org.apache.naming.resources.BaseDirContext.getAttributes(BaseDirContext.java:1090)
at org.apache.naming.resources.ProxyDirContext.getAttributes(ProxyDirContext.java:882)
at org.apache.catalina.loader.WebappClassLoader.modified(WebappClassLoader.java:1026)
at org.apache.catalina.loader.WebappLoader.modified(WebappLoader.java:500)
at org.apache.catalina.loader.WebappLoader.backgroundProcess(WebappLoader.java:420)
at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1345)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1530)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1540)
at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1519)
at java.lang.Thread.run(Thread.java:724)
Exception in thread "http-bio-8080-exec-1" java.lang.OutOfMemoryError: GC overhead limit exceeded
at java.util.jar.Attributes.read(Attributes.java:394)
at java.util.jar.Manifest.read(Manifest.java:199)
at java.util.jar.Manifest.<init>(Manifest.java:69)
at java.util.jar.JarFile.getManifestFromReference(JarFile.java:180)
at java.util.jar.JarFile.getManifest(JarFile.java:166)
at org.apache.catalina.loader.WebappClassLoader.findResourceInternal(WebappClassLoader.java:3135)
at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:2892)
at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:1210)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1690)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571)
at com.opensymphony.xwork2.util.logging.commons.CommonsLogger.error(CommonsLogger.java:38)
at org.apache.struts2.dispatcher.Dispatcher.sendError(Dispatcher.java:903)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:574)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:724)

這是堆棧跟蹤，我不得不說我使用Struts 2。

Answer 1

以下是有關潛在效率低下/問題的幾種想法：

1）為什么不使用ZipInputStream代替ZipFile，因為您不需要隨機訪問文件中間的內部條目http://www.java2s.com/Tutorial/Java/0180__File/UnzipusingtheZipInputStream.htm

2）我建議您檢查文件擴展名，以確保您處理包含較短行的文本文件。 可能會發生這樣的情況，即從二進制文件逐行讀取可能會導致將內部帶有垃圾的長字符串瘋狂地加載到內存中。

3） dbBridge方法中可能存在內存泄漏。