本文小编为大家详细介绍“Java怎么集成presto查询”，内容详细，步骤清晰，细节处理妥当，希望这篇“Java怎么集成presto查询”文章能帮助大家解决疑惑，下面跟着小编的思路慢慢深入，一起来学习新知识吧。
Java集成presto查询
1.pom文件引入相关jar
<dependency> <groupId>com.facebook.presto</groupId> <artifactId>presto-jdbc</artifactId> <version>0.234.1</version> </dependency>2.application.yml配置presto相关
presto: url: xxxxxx username: root password: root port: 80883.获取连接与测试
import com.alibaba.fastjson.JSONArray;import com.alibaba.fastjson.JSONObject;import com.sugon.xuanyuan.common.utils.StringUtils;import com.sugon.xuanyuan.service.dataprovider.utils.JdbcUtil;import org.springframework.beans.factory.annotation.Value;import org.springframework.context.annotation.Configuration;import java.sql.*;import java.util.Properties;@Configurationpublic class PrestoConnect { @Value("${presto.url}") private String server; @Value("${presto.port}") private String port; @Value("${presto.username}") private String username; @Value("${presto.password}") private String password; private Connection getConnection() throws Exception { String jdbcurl = "jdbc:presto://" + server + ":" + port + "/"; Connection conn ; Properties props = new Properties(); Class.forName("com.facebook.presto.jdbc.PrestoDriver"); props.setProperty("user", username); if (StringUtils.isNotBlank(password)) { props.setProperty("password", password); props.setProperty("SSL", "true"); //props.setProperty("SSLTrustStorePath", SSLTrustStorePath); //props.setProperty("SSLTrustStorePassword", SSLTrustStorePassword); jdbcurl = String.format("jdbc:presto://%s:%s/", server, port); } conn = DriverManager.getConnection(jdbcurl, props); conn.setCatalog("hive"); return conn; } public JSONArray getDataAll(String sql) throws Exception { JSONArray array = new JSONArray(); Statement ps = null; ResultSet rs = null; Connection con = null; try { con = getConnection(); ps = con.createStatement(); rs = ps.executeQuery(sql); // 获取列数 ResultSetMetaData metaData = rs.getMetaData(); int columnCount = metaData.getColumnCount(); // 遍历ResultSet中的每条数据 while (rs.next()) { JSONObject jsonObj = new JSONObject(); // 遍历每一列 for (int i = 1; i <= columnCount; i++) { String columnName = metaData.getColumnLabel(i); String value = StringUtils.isBlank(rs.getString(columnName)) ? "" : rs.getString(columnName); jsonObj.put(columnName, value); } array.add(jsonObj); } } catch (Exception e) { throw new Exception("ERROR:" + e.getMessage(), e); } finally { //关闭资源(先开后关) JdbcUtil.close(rs, ps, con); } return array; }}Java程序访问presto
pom.xml中引入presto-jdbc
<dependency><groupId>com.facebook.presto</groupId><artifactId>presto-jdbc</artifactId><version>0.267</version></dependency>package presto; import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.Statement; public class PrestoJdbcDemo { public static void main(String[] args) throws Exception{ //class.forname try { Class.forName("com.facebook.presto.jdbc.PrestoDriver"); }catch (ClassNotFoundException e){ e.printStackTrace(); } //若presto没有设置SSL认证，只需填写用户名，不需要填写密码。 Connection connection = DriverManager.getConnection("jdbc:presto://localhost:8080/mysql/tp_music","root",null); Statement stmt = connection.createStatement(); ResultSet rs = stmt.executeQuery("select * from mysql.tp_music.singer limit 3"); while (rs.next()) { System.out.println("name:"+rs.getString(2)+" birth:"+rs.getString(5)+" location:"+rs.getString(6)); } rs.close(); connection.close(); }}读到这里，这篇“Java怎么集成presto查询”文章已经介绍完毕，想要掌握这篇文章的知识点还需要大家自己动手实践使用过才能领会，如果想了解更多相关内容的文章，欢迎关注编程网行业资讯频道。
