fileoutputstream正在获取java。木卫一。IOException:流关闭错误，但未显式关闭它

Question

我的zipInputStream在写入第一个文件本身后将关闭，即使我没有关闭任何流

 ZipInputStream zipInputStream = new ZipInputStream(inputStream); 
 ZipEntry zipEntry = zipInputStream.getNextEntry();
  while (zipEntry != null) {

        modelFolderName = <somefoldername>
        modelFileName = <somefilename>

        String FILE_STORAGE_LOCATION = env.getProperty("workspacePath");

        File folder = new File(FILE_STORAGE_LOCATION + "/" + modelFolderName );
        if(!folder.exists()) {
            folder.mkdirs();
        }

        try (FileOutputStream fout=new FileOutputStream(FILE_STORAGE_LOCATION + "/" +  modelFolderName + "/" + modelFileName)) {
            try (BufferedInputStream in = new BufferedInputStream(zipInputStream)) {
              byte[] buffer = new byte[8096];
              while (true) {
                int count = in.read(buffer);
                if (count == -1) {
                  break;
                }
                fout.write(buffer, 0, count);
              }
            }
        }
        zipEntry = zipInputStream.getNextEntry();
    }

Answer 1

您正在使用语法try with resource。括号内的所有内容都将自动关闭，就像有一个finally块来关闭它一样

当in在隐式finally块中关闭时，zipInputStream也将关闭，因为BufferedInputStream是FilterInputStream的一个子类，它在自身关闭时关闭其源

（通常，大多数实现Closable的类在调用close时会释放任何相关的资源）

查看FilterInputStream::close的实现 https://github.com/openjdk-mirror/jdk7u-jdk/blob/master/src/share/classes/java/io/FilterInputStream.java

https://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html