尚学堂106天总结+eureka

1. Eureka架构图原理

1.  请描述Eureka架构原理。

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2. 什么是CAP定理

1.  什么是CAP原则？

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 2.  C、A、P分别表示什么？

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3.  CA、CP、AP分别表示什么含义？

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3. ZooKeeper与Eureka的区别

1.  Zookeeper与Eureka有哪些区别？

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4. Eureka的服务自我保护

 1.  什么是自我保护模式？

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 2.  为什么要启动自我保护？

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5. 关闭Eureka的服务自我保护

1.  如何关闭自我保护？

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6. 服务的优雅停服

 2.  访问优雅停服的URI是什么？

"http://127.0.0.1:9090/shutdown"

7. 开启Eureka注册中心的安全认证

1.  实现Eureka安全认证的步骤是什么？

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2. 如果开启安全认证，注册中心在集群环境下各个节点访问时，如何传递用户名与密码？

8. 什么是Ribbon及作用

1.  什么是Ribbon？

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2. Ribbon解决了什么问题？

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1. Ribbon的负载均衡策略有哪些？

   
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HttpClientUtil

public class HttpClientUtil {

    public static String doGet(String url, Map<String, String> param) {

        // 创建Httpclient对象
        CloseableHttpClient httpclient = HttpClients.createDefault();

        String resultString = "";
        CloseableHttpResponse response = null;
        try {
            // 创建uri
            URIBuilder builder = new URIBuilder(url);
            if (param != null) {
                for (String key : param.keySet()) {
                    builder.addParameter(key, param.get(key));
                }
            }
            URI uri = builder.build();

            // 创建http GET请求
            HttpGet httpGet = new HttpGet(uri);

            // 执行请求
            response = httpclient.execute(httpGet);
            // 判断返回状态是否为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) {
        // 创建Httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;
        String resultString = "";
        try {
            // 创建Http Post请求
            HttpPost httpPost = new HttpPost(url);
            // 创建参数列表
            if (param != null) {
                List<NameValuePair> paramList = new ArrayList<>();
                for (String key : param.keySet()) {
                    paramList.add(new BasicNameValuePair(key, param.get(key)));
                }
                // 模拟表单
                UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList,"utf-8");
                httpPost.setEntity(entity);
            }
            // 执行http请求
            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) {
        // 创建Httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();
        CloseableHttpResponse response = null;
        String resultString = "";
        try {
            // 创建Http Post请求
            HttpPost httpPost = new HttpPost(url);
            // 创建请求内容
            StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
            httpPost.setEntity(entity);
            // 执行http请求
            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://127.0.0.1:9090/shutdown";
        //该url必须要使用dopost方式来发送
        HttpClientUtil.doPost(url);
    }
}

spring.application.name=eureka-provider
server.port=9090

eureka.client.serviceUrl.defaultZone=http://user:123456@eureka1:8761/eureka/,http://user:123456@eureka2:8761/eureka/

endpoints.shutdown.enabled=true
endpoints.shutdown.sensitive=false