Simple Log Service:Get started with Simple Log Service SDK for Java

In this example, a file named SlsQuickStart.java is created. The sample code in this file provides an example on how to call API operations to create a project, create a Logstore, create indexes, write logs, and query logs. Example:

import com.aliyun.openservices.log.common.Index;
import com.aliyun.openservices.log.common.LogContent;
import com.aliyun.openservices.log.common.LogItem;
import com.aliyun.openservices.log.common.LogStore;
import com.aliyun.openservices.log.common.QueriedLog;
import com.aliyun.openservices.log.exception.LogException;
import com.aliyun.openservices.log.response.GetLogsResponse;
import com.aliyun.openservices.log.Client;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

public class SlsQuickStart {
    /**
     * In this example, the AccessKey ID and AccessKey secret are obtained from environment variables. 
     */
    static String accessId = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_ID");
    static String accessKey = System.getenv("ALIBABA_CLOUD_ACCESS_KEY_SECRET");
    /**
     * The Simple Log Service endpoint. In this example, the Simple Log Service endpoint for the China (Hangzhou) region is used. Replace the parameter value with the actual endpoint. 
     */
    static String host = "cn-hangzhou.log.aliyuncs.com";
    /**
     * Create a Simple Log Service client. 
     */
    static Client client = new Client(host, accessId, accessKey);
    /**
     * // The name of the project. 
     */
    static String projectName = "aliyun-test-gs-project";
    /**
     * The name of the Logstore. 
     */
    static String logstoreName = "aliyun-test-logstore";
    /**
     * The query statement. 
     */
    static String query = "*| select * from " + logstoreName;

    /**
     * Create a project. 
     *
     * @throws LogException
     * @throws InterruptedException
     */
    static void createProject() throws LogException, InterruptedException {
        String projectDescription = "project description";
        System.out.println("ready to create project");
        client.CreateProject(projectName, projectDescription);
        System.out.println(String.format("create project %s success", projectName));
        TimeUnit.SECONDS.sleep(60 * 2);
    }

    /**
     * Create a Logstore. 
     *
     * @throws LogException
     * @throws InterruptedException
     */
    static void createLogstore() throws LogException, InterruptedException {
        System.out.println("ready to create logstore");
        int ttlInDay = 3;     // The retention period of data. If you set this parameter to 3650, data is permanently stored. Unit: days. 
        int shardCount = 2;   // The number of shards. 
        LogStore store = new LogStore(logstoreName, ttlInDay, shardCount);
        client.CreateLogStore(projectName, store);
        System.out.println(String.format("create logstore %s success", logstoreName));
        TimeUnit.SECONDS.sleep(60);
    }

    /**
     * Create indexes for the Logstore. 
     *
     * @throws LogException
     * @throws InterruptedException
     */
    static void createIndex() throws LogException, InterruptedException {
        System.out.println(String.format("ready to create index for %s", logstoreName));
        String logstoreIndex = "{\"line\": {\"token\": [\",\", \" \", \"'\", \"\\\"\", \";\", \"=\", \"(\", \")\", \"[\", \"]\", \"{\", \"}\", \"?\", \"@\", \"&\", \"<\", \">\", \"/\", \":\", \"\\n\", \"\\t\", \"\\r\"], \"caseSensitive\": false, \"chn\": false}, \"keys\": {\"dev\": {\"type\": \"text\", \"token\": [\",\", \" \", \"'\", \"\\\"\", \";\", \"=\", \"(\", \")\", \"[\", \"]\", \"{\", \"}\", \"?\", \"@\", \"&\", \"<\", \">\", \"/\", \":\", \"\\n\", \"\\t\", \"\\r\"], \"caseSensitive\": false, \"alias\": \"\", \"doc_value\": true, \"chn\": false}, \"id\": {\"type\": \"long\", \"alias\": \"\", \"doc_value\": true}}, \"log_reduce\": false, \"max_text_len\": 2048}";
        Index index = new Index();
        index.FromJsonString(logstoreIndex);
        client.CreateIndex(projectName, logstoreName, index);
        System.out.println(String.format("create index for %s success", logstoreName));
        TimeUnit.SECONDS.sleep(60);
    }

    /**
     * Write data to the Logstore. To improve the I/O efficiency of your system, we recommend that you do not use this method to write data to Simple Log Service. This method is for reference only If you want to write data to Simple Log Service in big data and high concurrency scenarios, we recommend that you use Alibaba Cloud Log Java Producer. 
     *
     * @throws LogException
     * @throws InterruptedException
     */
    static void pushLogs() throws LogException, InterruptedException {
        System.out.println(String.format("ready to push logs for %s", logstoreName));
        List<LogItem> logGroup = new ArrayList<LogItem>();
        for (int i = 0; i < 100; ++i) {
            LogItem logItem = new LogItem();
            logItem.PushBack("id", String.valueOf(i));
            logItem.PushBack("dev", "test_push");
            logGroup.add(logItem);
        }
        client.PutLogs(projectName, logstoreName, "", logGroup, "");
        System.out.println(String.format("push logs for %s success", logstoreName));
        TimeUnit.SECONDS.sleep(5);
    }

    /**
     * Execute an SQL statement to query logs. 
     *
     * @throws LogException
     */
    static void queryLogs() throws LogException {
        System.out.println(String.format("ready to query logs from %s", logstoreName));
        // The fromTime and toTime parameters specify the start time and end time of the time range within which you want to query logs. The values of the parameters are UNIX timestamps. 
        int fromTime = (int) (System.currentTimeMillis() / 1000 - 3600);
        int toTime = fromTime + 3600;
        GetLogsResponse getLogsResponse = client.GetLogs(projectName, logstoreName, fromTime, toTime, "", query);
        for (QueriedLog log : getLogsResponse.getLogs()) {
            for (LogContent mContent : log.mLogItem.mContents) {
                System.out.println(mContent.mKey + " : " + mContent.mValue);
            }
            System.out.println("********************");
        }
    }

    public static void main(String[] args) throws LogException, InterruptedException {
        /**
         * Create a project. 
         */
        createProject();
        /**
         * Create a Logstore. 
         */
        createLogstore();
        /**
         * Create indexes. 
         */
        createIndex();
        /**
         * Write data. 
         */
        pushLogs();
        /**
         * Query logs. 
         */
        queryLogs();
    }
}