由於eureka的自我保護機制,直接對服務進行停止會使得eureka serve進入自我保護模式。服務並不會從列表中刪除。
1.不需要再 Eureka Server 中配置關閉自我保護
首先將服務開啓自我保護
然後讓對應的服務具有優雅停服的功能,比如provider服務
2.需要再服務中添加 actuator.jar 包
需要添加actuator的jar包,只需要將pom文件改成
<!--監控依賴-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
注意actuator的依賴在spring-cloud-starter-eureka-server中,所以我們要將Eureka的依賴修改爲此
application.yml全局配置文件添加如下
management:
endpoints:
web:
exposure:
include: shutdown #暴漏shutdown端點服務
endpoint:
shutdown:
enabled: true
3.啓動服務
然後在postman裏邊用post請求方式,請求如下地址
http://ip:port/actuator/shutdown
4.發送一個關閉服務的 URL 請求
我們也可以通過HttpClient來發送一個停止服務的請求
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.8</version>
</dependency>
創建一個java類
package com.bruceliu.utils;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.entity.ContentType;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import java.io.IOException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* @program: springcloud-eureka-consumer
* @description: httpClient工具類
*/
public class HttpClientUtil {
public static String doGet(String url, Map<String, String> param) {
// 創建Httpclient對象
CloseableHttpClient httpclient = HttpClients.createDefault();
String resultString = "";
CloseableHttpResponse response = null;
try {
// 創建uri
URIBuilder builder = new URIBuilder(url);
if (param != null) {
for (String key : param.keySet()) {
builder.addParameter(key, param.get(key));
}
}
URI uri = builder.build();
// 創建http GET請求
HttpGet httpGet = new HttpGet(uri);
// 執行請求
response = httpclient.execute(httpGet);
// 判斷返回狀態是否爲200
if (response.getStatusLine().getStatusCode() == 200) {
resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (response != null) {
response.close();
}
httpclient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return resultString;
}
public static String doGet(String url) {
return doGet(url, null);
}
public static String doPost(String url, Map<String, String> param) {
// 創建Httpclient對象
CloseableHttpClient httpClient = HttpClients.createDefault();
CloseableHttpResponse response = null;
String resultString = "";
try {
// 創建Http Post請求
HttpPost httpPost = new HttpPost(url);
// 創建參數列表
if (param != null) {
List<NameValuePair> paramList = new ArrayList<>();
for (String key : param.keySet()) {
paramList.add(new BasicNameValuePair(key, param.get(key)));
}
// 模擬表單
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList, "utf-8");
httpPost.setEntity(entity);
}
// 執行http請求
response = httpClient.execute(httpPost);
resultString = EntityUtils.toString(response.getEntity(), "utf-8");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
response.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return resultString;
}
public static String doPost(String url) {
return doPost(url, null);
}
public static String doPostJson(String url, String json) {
// 創建Httpclient對象
CloseableHttpClient httpClient = HttpClients.createDefault();
CloseableHttpResponse response = null;
String resultString = "";
try {
// 創建Http Post請求
HttpPost httpPost = new HttpPost(url);
// 創建請求內容
StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
httpPost.setEntity(entity);
// 執行http請求
response = httpClient.execute(httpPost);
resultString = EntityUtils.toString(response.getEntity(), "utf-8");
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
response.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return resultString;
}
public static void main(String[] args) {
String url = "http://127.0.0.1:8080/actuator/shutdown";
//該url必須要使用dopost方式來發送
HttpClientUtil.doPost(url);
}
}
執行main方法,觀察服務提供者及註冊中心註冊的服務
服務端的服務被停止了