Dropwizard:新的管理资源

时间:2015-09-24 14:44:36

标签: java servlets admin dropwizard

我使用的是Drowpizard 0.7.1,但也许我很快会升级到0.8.4。

有没有人知道如何向dropwizard添加管理资源,这在操作菜单中显示,如下例所示?

Operational Menu

    Metrics
    Ping
    Threads
    Healthcheck
    CustomAdminXy

2 个答案:

答案 0 :(得分:8)

我认为你不能轻易做到这一点。

构建ServerFactory时会创建AdminServlet。可以扩展DefaultServerFactory并覆盖createAdminServlet以使用您的链接等创建自定义Admin servlet ...(然后您必须通过配置设置服务器工厂。)

似乎这会涉及一些代码重复,并且可能非常脆弱。

注册自己的管理servlet(除常规管理servlet之外)可能更容易,例如:

environment.admin().addServlet("custom-admin", new CustomAdminServlet())
    .addMapping("/custom-admin");

可能也不理想。

答案 1 :(得分:3)

.addMapping("")与Dropwizard 0.9.1版一起使用,可以覆盖菜单,而不会与"/*"处的默认AdminServlet映射冲突。

在申请表中:

public void run(final NetworkModelApplicationConfiguration configuration, final Environment environment) {
    environment.admin().addServlet("my-admin-menu", new MyAdminServlet()).addMapping("");
    environment.admin().addServlet("my-admin-feature", new MyAdminFeatureServlet()).addMapping("/myAdminFeature");
}

扩展AdminServlet并不是非常有用,因为所有属性都是私有的。我构建了一个HTTPServlet,它将资源作为模板读取:

public class MyAdminServlet extends HttpServlet {
  private String serviceName;

  @Override
  public void init(ServletConfig config) throws ServletException {
    super.init(config);
    this.serviceName = config.getInitParameter("service-name");
  }

  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    String path = req.getContextPath() + req.getServletPath();
    resp.setStatus(200);
    resp.setHeader("Cache-Control", "must-revalidate,no-cache,no-store");
    resp.setContentType("text/html");
    PrintWriter writer = resp.getWriter();

    try {
      String template = getResourceAsString("/admin.html", "UTF-8");
      String serviceName = this.serviceName == null?"":" (" + this.serviceName + ")";

      writer.println(MessageFormat.format(template, new Object[] { path, serviceName }));
    } finally {
      writer.close();
    }
  }

  String getResourceAsString(String resource, String charSet) throws IOException {
    InputStream in = this.getClass().getResourceAsStream(resource);
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    byte[] buffer = new byte[1024];
    int len;
    while ((len = in.read(buffer)) != -1) {
      out.write(buffer, 0, len);
    }
    return out.toString(charSet);
  }
}

我的/admin.html资源如下所示:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Operational Menu{1}</title>
  </head>
  <body>
    <h1>Operational Menu{1}</h1>
    <ul>
      <li><a href="{0}/metrics?pretty=true">Metrics</a></li>
      <li><a href="{0}/ping">Ping</a></li>
      <li><a href="{0}/threads">Threads</a></li>
      <li><a href="{0}/healthcheck?pretty=true">Healthcheck</a></li>
      <li><a href="{0}/myAdminFeature">My Admin Feature</a></li>
    </ul>
  </body>
</html>