Question

我需要计算每个端点上的视图。这个想法是为所有端点创建一个通用的请求计数映射，该请求应基于动态输入的端点返回视图计数。

假设某人想查看http://localhost:8080/user/101上的观看次数。

RequestMappping path = /admin/count & RequestParam = url (Here /user/101)
然后创建dynamic Request based on RequestParam http://localhost:8080/actuator/metrics/http.server.requests?tag=uri:/user/101
Get and Return the Response的动态请求(JSON Object)并获得COUNT的值

我坚持将dynamic request发送给 http://localhost:8080/actuator/metrics/http.server.requests?tag=uri:/user/101 并返回它的响应并获得计数值

@RequestMapping(path="/admin/count",method=RequestMethod.POST)
public JSONObject count(@RequestParam(name="url") final String url)//@PathVariable(name="url") final String url
{   
    String finalURL = "http://localhost:8080/actuator/metrics/http.server.requests?tag=uri:" + url + "";
    return sendRequestToURL(finalURL);  
}

@RequestMapping(path="/{finalURL}",method=RequestMethod.GET)
public JSONObject sendRequestToURL(@PathVariable("finalURL") String url)
{
    //How to return the response Here
}

这是我直接触发URL时得到的

获取：http://localhost:8080/actuator/metrics/http.server.requests?tag=uri:/user/101

  {
    "name": "http.server.requests",
    "description": null,
    "baseUnit": "seconds",
    "measurements": [
        {
            "statistic": "COUNT",
            "value": 1
        },
        {
            "statistic": "TOTAL_TIME",
            "value": 0.3229436
        },
        {
            "statistic": "MAX",
            "value": 0.3229436
        }
    ],
    "availableTags": [
        {
            "tag": "exception",
            "values": [
                "None"
            ]
        },
        {
            "tag": "method",
            "values": [
                "GET"
            ]
        },
        {
            "tag": "outcome",
            "values": [
                "SUCCESS"
            ]
        },
        {
            "tag": "status",
            "values": [
                "200"
            ]
        }
    ]
}

环境：

    `spring boot 2.1.2.RELEASE`
    <java.version>1.8</java.version>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
    </dependency>

Answer 1

所以您想用actuator/metrics封装/admin/count

有许多方法和库可以用Java调用Rest API

我将添加最简单的一个

类似这样的东西

public JSONObject sendRequestToURL(@PathVariable("finalURL") String urlToRead)
{
      StringBuilder result = new StringBuilder();
      URL url = new URL(urlToRead);
      HttpURLConnection conn = (HttpURLConnection) url.openConnection();
      conn.setRequestMethod("GET");
      BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
      String line;
      while ((line = rd.readLine()) != null) {
         result.append(line);
      }
      rd.close();
      return new JSONObject(result.toString());  // org.json
}

编辑1：

您快到了。只需将String解析为JSONObject。尝试这个

String strJson = result.toString().replace("\\\"","'");
JSONObject jo = new JSONObject(strJson.substring(1,json.length()-1));
return jo;

编辑2：

我想您已经安装了Spring Security。

当您在内部调用API时，Spring被视为需要身份验证的外部调用。

作为一种解决方法，您可以从安全上下文中排除/actuator API。

@Override
protected void configure(HttpSecurity http) throws Exception {
    http.csrf().disable().authorizeRequests()
     .antMatchers("/actuator*").permitAll()

     ...
}

或XML

<security:http  auto-config="true"  use-expressions="true"   >
    <security:intercept-url pattern="/actuator*" access="permitAll"/>

    ...
</security:http>

希望Spring安全性将忽略此URL，并且您将不会获得登录表单。

Answer 2

这个想法是，您将从用户那里获取endPoint进行显示，以显示将使用@RequestParam完成的视图计数。 Based on the request endPoint create the URLtoMap根据您的要求

(i.e methods, status, outcome, exception etc, e.g. http://localhost:8080/actuator/metrics/http.server.requests?tag=uri:/user/101&tag=method:GET).

@RequestMapping(path="/admin/count",method=RequestMethod.POST)
    public int count(@RequestParam(name="endPoint") final String endPoint) throws IOException, JSONException
    {
        final String URLtoMap = "http://localhost:8080/actuator/metrics/http.server.requests?tag=uri:" + endPoint + "";
        return sendRequestToURL(URLtoMap);
    }

现在基于URLtoMap使用HttpURLConnection发送请求，并使用BufferedReader获取输出。当我使用Spring Security时，我被重定向到登录页面。为了解决该问题，我在SecurityConfig文件中添加了antMatchers，如下所示。如果您面对JSONException: Value of type java.lang.String cannot be converted to JSONObject，请参考this

public int sendRequestToURL(@PathVariable("URLtoMap") String URLtoMap) throws IOException, JSONException
{
      int count = 0;
      StringBuilder result = new StringBuilder();
      URL url = new URL(URLtoMap);
      HttpURLConnection conn = (HttpURLConnection) url.openConnection();
      conn.setRequestMethod("GET");
      BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
      String line;
      while ((line = rd.readLine()) != null) {
         result.append(line);
      }
      rd.close();

      try {
            JSONObject jsonObject =new JSONObject(result.toString().replace("\"", "")); 
            JSONObject jsonCountObject = new JSONObject(jsonObject.getJSONArray("measurements").get(0).toString());
            count =(int) jsonCountObject.get("value");
        }
        catch (JSONException e) {
            e.printStackTrace();
        }

      return count;
}

SecurityConfig

@Override
        protected void configure(HttpSecurity http) throws Exception{

             http
             .csrf().disable()
             .authorizeRequests().antMatchers("/login").permitAll()
             .antMatchers(HttpMethod.GET,"/actuator/**").permitAll() 
             .antMatchers(HttpMethod.POST,"/actuator/**").permitAll() 
}

pom.xml

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
</dependency>

<dependency>
  <groupId>org.json</groupId>
  <artifactId>json</artifactId>
  <version>20090211</version>
</dependency>

导入正确的软件包

import org.json.JSONException;
import org.json.JSONObject;
import java.net.URL;
import java.net.HttpURLConnection;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

使用执行器为每个端点计数视图

2 个答案: