java - 关闭 ByteArrayOutputStream 的最佳方法是什么？

Question

我需要优化一个使用过多堆内存的应用程序。我在使用 ByteArrayOutputStream 变量后关闭它时遇到问题。我试过使用 close() 来做，但它不起作用。这是代码:

ByteArrayOutputStream zipOutTempStream = new ByteArrayOutputStream();
//arquivo.getZipStream() has the XML received by FTP.
//STreamEtils is the function who transfers the XML to zipOutTempStream
StreamUtils.copiarStream(arquivo.getZipStream(), zipOutTempStream);

            //Creating a new XML to write over this.
            File arquivo1 = new File("C:/XML.xml");
            if (arquivo1.exists()) {
                System.out.println("ele existe");
            } else {
                if (arquivo1.createNewFile()) {
                    System.out.println("arquivo criado");
                } else {
                    System.out.println("arquivo não criado");
                }
            }

            FileOutputStream arquivo2 = new FileOutputStream(arquivo1);
            //Copy the unziped XML to the new xml created.
            StreamUtils.copiarStream(StreamUtils                .uncompressXmlFromZipStream(new ByteArrayInputStream(zipOutTempStream.toByteArray())), arquivo2);
            arquivo.setZipStream(null);
            arquivo.setXmlStream(null)      
return arquivo;

Answer 1

您不能关闭 ByteArrayOutputStream，因为它是 close()方法记录为

Closing a ByteArrayOutputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

这个输出流由一个数组支持；它不是缓冲流。如果您觉得它使用了太多内存，您应该使用适当的 OutputStream 将字节直接输出到某个端点，例如文件或套接字。