■ try-with-resources
* C#の using のように、close()をしなくても自動的にclose処理をしてくれる
* Java 1.7から使用可能
■ closeが一つの場合
構文
try (XxxxxStream stream = new XxxxxStream()) {
// something
} catch (Exception ex) {
}
サンプル
一部抜粋
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try (OutputStream outputStream = response.getOutputStream()) {
response.setContentType("text/html;charset=utf-8");
outputStream.write("File not found".getBytes());
} catch (Exception ex) {
ex.printStackTrace();
}
}
■ closeが複数の場合
構文
try (XxxxxStream stream1 = new XxxxxStream();
XxxxxStream stream2 = new XxxxxStream();
XxxxxStream stream3 = new XxxxxStream()) {
// something
} catch (Exception ex) {
}
サンプル
一部抜粋
private void download(HttpServletRequest request,
HttpServletResponse response,
File downloadFile) {
try (OutputStream outputStream = response.getOutputStream();
FileInputStream fileInputStream = new FileInputStream(downloadFile);
BufferedInputStream bufferedInputStream =
new BufferedInputStream(fileInputStream);) {
// something
} catch (Exception ex) {
ex.printStackTrace();
}
}
