登录cloudera manager，并查询impala query历史java示例

最新推荐文章于 2021-10-27 10:11:27 发布

原创最新推荐文章于 2021-10-27 10:11:27 发布 · 2.8k 阅读

1 ·

CC 4.0 BY-SA版权

文章标签：

#impala #cloudera

本文介绍了如何使用Java代码登录Cloudera Manager平台，通过实现POST请求完成用户认证，进而获取Cookie信息。利用这些Cookie信息，可以发起GET请求访问特定的API端点，查询Impala的历史查询记录。代码示例展示了具体的实现步骤，包括初始化HTTP客户端、构造请求参数、发送请求以及解析响应内容。

通过java登录cloudera manager，并进行impala query历史查询示例！

package commons;

import org.apache.commons.httpclient.Cookie;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.cookie.CookiePolicy;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.slf4j.Logger;

public class HttpAuthen {
    static Logger logger = org.slf4j.LoggerFactory.getLogger(HttpAuthen.class);

    public static void main(String[] args) {
        //hostip和账户替换为你自己的
        String loginUrl = "http://hostip:7180/j_spring_security_check";
        String dataUrl = "http://hostip:7180/api/v11/clusters/Cluster1/services/impala/impalaQueries";

        // 需登陆后访问的 Url
        System.out.println(getHttpClient(loginUrl,dataUrl,"j_username","j_password","user", "user"));
        System.out.println(getHttpClient(loginUrl,dataUrl,"j_username","j_password","user", "passwd"));

    }
//   java  -cp commons.HttpAuthen
    public static String getHttpClient(String loginUrl,String dataUrl,String userLabel,String passwdLabel,String userName,String passwd) {
        HttpClient httpClient = new HttpClient();
        // 模拟登陆，按实际服务器端要求选用 Post 或 Get 请求方式
        PostMethod postMethod = new PostMethod(loginUrl);

        NameValuePair[] data = { new NameValuePair(userLabel, userName), new NameValuePair(passwdLabel, passwd) };
        postMethod.setRequestBody(data);
        try {
            // 设置 HttpClient 接收 Cookie,用与浏览器一样的策略
            httpClient.getParams().setCookiePolicy(CookiePolicy.BROWSER_COMPATIBILITY);
            httpClient.executeMethod(postMethod);
            // 获得登陆后的 Cookie
            Cookie[] cookies = httpClient.getState().getCookies();
            StringBuffer tmpcookies = new StringBuffer();
            for (Cookie c : cookies) {
                tmpcookies.append(c.toString() + ";");
            }
            GetMethod getMethod = new GetMethod(dataUrl);
            getMethod.setRequestHeader("cookie", tmpcookies.toString());
            postMethod.setRequestHeader("Referer", "http://www.cc");
            postMethod.setRequestHeader("User-Agent", "www Spot");
            httpClient.executeMethod(getMethod);
            String text = getMethod.getResponseBodyAsString();
            return text;
        } catch (Exception e) {
            logger.error("",e);
        }
        return null;
    }
}