自动关闭作为参数传递的资源

使用Java9和更高版本,您可以

void doSomething(OutputStream out) {
  try (out) {
    // do something with the OutputStream
  }
}

只有当 out Java Language Specification version 10 14.20.3. try-with-resources .

我使用Java8,它不支持资源引用。创建接受 Closable

public static <T extends Closeable> void doAndClose(T out, Consumer<T> payload) throws Exception {
    try {
        payload.accept(out);
    } finally {
        out.close();
    }
}

客户端代码可能如下所示:

OutputStream out = null;

doAndClose(out, os -> {
    // do something with the OutputStream
});

InputStream in = null;

doAndClose(in, is -> {
    // do something with the InputStream
});

void doSomething(OutputStream out) {
  try {
    // do something with the OutputStream
  }
  finally {
    org.apache.commons.io.IOUtils.closeQuietly(out);
  }
}