技術めも

昨日書いた記事を検証してみた。

以下３つの例を検証。

1.単純ケース

@WebServlet(name = "test01", urlPatterns = {"/test01"})
public class Test01 extends HttpServlet {

  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    String name = req.getParameter("name");

    try (PrintWriter writer = resp.getWriter();) {
      resp.setStatus(200);
      resp.setContentType("text/plain");
      writer.write("name is " + name);
      writer.flush();
      writer.close();
    }
  }
}

2.絶対ダメなケース

@WebServlet(name = "test02", urlPatterns = {"/test02"})
public class Test02 extends HttpServlet {

  private String name;

  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    name = req.getParameter("name");

    try (PrintWriter writer = resp.getWriter();) {
      resp.setStatus(200);
      resp.setContentType("text/plain");
      writer.write("name is " + name);
      writer.flush();
      writer.close();
    }
  }
}

3.今回検証したかったケース

@WebServlet(name = "test03", urlPatterns = {"/test03"})
public class Test03 extends HttpServlet {

  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    new MyClass(req, resp).execute();
  }

  class MyClass {

    private HttpServletRequest req;
    private HttpServletResponse resp;
    private String name;

    public MyClass(HttpServletRequest req, HttpServletResponse resp) {
      this.req = req;
      this.resp = resp;

      name = req.getParameter("name");
    }

    public void execute() throws IOException {
      try (PrintWriter writer = resp.getWriter();) {
        resp.setStatus(200);
        resp.setContentType("text/plain");
        writer.write("name is " + name);
        writer.flush();
        writer.close();
      }
    }
  }
}

結論としては、３は大丈夫であった。

jmeterで同時接続１００を１０回やって、一度も不整合は起きず。