我是靠谱客的博主 微笑路灯，最近开发中收集的这篇文章主要介绍jdbc之java连接mysql，hive，hbase全解JAVA连接MysqlJAVA连接hiveJAVA连接HBase，觉得挺不错的，现在分享给大家，希望可以做个参考。
概述
创建maven工程
Maven–》勾选Create from archetype
–》maven-archetype-quickstart
–》NEXT
点击Enable Auto Import自动导包
在pom文件的properties里修改版本为1.8
改为
修改Project Structure
将language level改为8
File-Settings
修改字节编码版本为1.8
在src-》main下新建文件夹名resources，将其配置为资源文件夹，此后所有的配置文件均可放在此文件夹下，运行java代码时这些配置就可起作用
Project Structure–>Project Settrings -->Modules -->找到resources文件夹，选中，点击Resources–》Apply --》OK
maven工程创建完成，下面三种第一步均需此操作
JAVA连接Mysql
Pom文件导依赖
加上mysql-connector-java的依赖即可
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
Pom文件全部
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cn.wxj.mysql.jdbc</groupId>
<artifactId>java_mysql</artifactId>
<version>1.0-SNAPSHOT</version>
<name>java_mysql</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
</dependencies>
<build>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.7.1</version>
</plugin>
<plugin>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>3.0.0</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
配置文件设置
resources文件夹下新建文件datasource.properties
编辑以下四项配置内容
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://192.168.182.131:3306/kb06mysqltestdb?useUnicode=true&characterEncoding=utf8&useSSL=true
username=root
password=javakb10
代码实现阶段
1.定义BaseConfig类获取datasource.properties的驱动，数据库url，用户名，密码连接mysql数据库
定义内部类Config，使用其对象作为BaseConfig的成员变量，加载驱动等信息
//定义内部类Config，使用其对象作为BaseConfig的成员变量，加载驱动等信息
private class Config{
String driver;
String url;
String username;
String password;
}
private Config config;
定义valid方法检测url格式是否正确
//valid类检测url格式是否正确
private boolean valid(String url) {
Pattern p = Pattern.compile("jdbc:\w+://((\d{1,3}\.){3}\d{1,3}|\w+):\d{1,5}/\w+");
Matcher m = p.matcher(url);
return m.matches();
}
init方法将配置信息加载到BaseConfig的成员变量config上
//init方法将配置信息加载到BaseConfig的成员变量config上
private void init() throws Exception {
//用线程读取读取资源文件datasource.properties的路径
String path=Thread.currentThread().getContextClassLoader()
.getResource("datasource.properties").getPath();
//使用Properties包装类解析properties文件
Properties pro=new Properties();
pro.load(new FileReader(path));
String url=pro.getProperty("url");
if(url==null|| !valid(url)){
throw new Exception("no or invalid url exception");
}
config=new Config();
config.url=url;
config.driver =pro.getProperty("driver","org.apache.hive.jdbc.HiveDriver");
config.username=pro.getProperty("username","root");
config.password=pro.getProperty("password","javakb10");
pro.clear();
}
用代码块调用init方法,加载数据库配置信息并加载驱动driver
//用代码块调用init方法,加载数据库配置信息并加载驱动driver
{
try {
init();
Class.forName(config.driver);
} catch (Exception e) {
e.printStackTrace();
}
}
获得数据库连接Connection
//获得数据库连接Connection
protected Connection getCon() throws SQLException {
return DriverManager.getConnection(config.url,config.username,config.password);
}
通用关闭线程方法
//
protected void close(AutoCloseable...acs){
if(acs!=null){
for (AutoCloseable ac : acs) {
try {
ac.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
BaseConfig类整体代码
package cn.wxj.mysql.jdbc;
import java.io.FileReader;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class BaseConfig {
//定义内部类Config，使用其对象作为BaseConfig的成员变量，加载驱动等信息
private class Config{
String driver;
String url;
String username;
String password;
}
private Config config;
//valid类检测url格式是否正确
private boolean valid(String url) {
Pattern p = Pattern.compile("jdbc:\w+://((\d{1,3}\.){3}\d{1,3}|\w+):\d{1,5}/\w+");
Matcher m = p.matcher(url);
return m.matches();
}
//用代码块调用init方法,加载数据库配置信息并加载驱动driver
{
try {
init();
Class.forName(config.driver);
} catch (Exception e) {
e.printStackTrace();
}
}
//获得数据库连接Connection
protected Connection getCon() throws SQLException {
return DriverManager.getConnection(config.url,config.username,config.password);
}
//通用关闭线程方法
protected void close(AutoCloseable...acs){
if(acs!=null){
for (AutoCloseable ac : acs) {
try {
ac.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
//init方法将配置信息加载到BaseConfig的成员变量config上
private void init() throws Exception {
//用线程读取读取资源文件datasource.properties的路径
String path=Thread.currentThread().getContextClassLoader()
.getResource("datasource.properties").getPath();
//使用Properties包装类解析properties文件
Properties pro=new Properties();
pro.load(new FileReader(path));
String url=pro.getProperty("url");
if(url==null|| !valid(url)){
throw new Exception("no or invalid url exception");
}
config=new Config();
config.url=url;
config.driver =pro.getProperty("driver","org.apache.hive.jdbc.HiveDriver");
config.username=pro.getProperty("username","root");
config.password=pro.getProperty("password","javakb10");
pro.clear();
}
}
2.Result类，方便解析sql语句产生的结果
package cn.wxj.mysql.jdbc;
public class Result<T> {
private T data;
private boolean isErr;
public Result( boolean isErr,T data) {
this.data = data;
this.isErr = isErr;
}
public T getData() {
return data;
}
public boolean isErr() {
return isErr;
}
public static <T>Result Succeed(T data){
return new Result(false,data);
}
public static Result Fail(){
return new Result(true,null);
}
}
3.BaseDao类，使sql语句成功编译执行
package cn.wxj.mysql.jdbc;
import java.io.BufferedReader;
import java.io.FileReader;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class BaseDao extends BaseConfig {
//预编译执行器PreparedStatement（防止sql注入）
private PreparedStatement getPst(Connection con, String sql, Object...params) throws SQLException {
PreparedStatement pst=con.prepareStatement(sql);
if(params.length>0){
for (int i = 0; i < params.length; i++) {
pst.setObject(i+1,params[i]);
}
}
return pst;
}
//非查询语句调用方法
public Result exeNonQuery(String sql,Object...params){
Connection con=null;
PreparedStatement pst=null;
try {
con=getCon();
pst=getPst(con,sql,params);
return Result.Succeed(pst.executeUpdate());
} catch (SQLException e) {
e.printStackTrace();
return Result.Fail();
}finally {
close(pst,con);
}
}
//查询语句调用方法
public Result exeQuery(String sql,Object...params){
Connection con=null;
PreparedStatement pst=null;
ResultSet rst=null;
List<List<String>> data=new ArrayList<>();
try {
con=getCon();
pst=getPst(con,sql,params);
rst=pst.executeQuery();
final int COUNT=rst.getMetaData().getColumnCount();
while (rst.next()){
List<String> row=new ArrayList<>(COUNT);
for (int i = 1; i <= COUNT; i++) {
row.add(rst.getObject(i).toString());
}
data.add(row);
}
return Result.Succeed(data);
} catch (SQLException e) {
e.printStackTrace();
return Result.Fail();
}finally {
close(rst,pst,con);
}
}
//读取sql语句
public String readSql(String...paths) throws Exception {
String path=paths.length==0?"sql/sql.sql":paths[0];
StringBuilder builder=new StringBuilder();
BufferedReader read=new BufferedReader(new FileReader(path));
String line=null;
while (null!=(line=read.readLine())){
builder.append(line.trim()+" ");
}
return builder.toString();
}
}
4.Test类 main方法执行SQL语句，显示结果
public class Test {
public static void main(String[] args) throws Exception{
BaseDao dao=new BaseDao();
Result<List<List<String>>> result = dao.exeQuery(dao.readSql());
List<List<String>> table=result.getData();
table.forEach(tab->{
tab.forEach(row->{
System.out.print(row+"t");
});
System.out.println();
});
Result result1 = dao.exeNonQuery(dao.readSql());
System.out.println(result1);
}
}
以查询语句为例输出结果
JAVA连接hive
Pom依赖
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<hadoop.version>2.6.0</hadoop.version>
<hive.version>1.1.0</hive.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.hive</groupId>
<artifactId>hive-jdbc</artifactId>
<version>${hive.version}</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-auth</artifactId>
<version>${hadoop.version}</version>
<exclusions>
<exclusion>
<artifactId>jdk.tools</artifactId>
<groupId>jdk.tools</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-common</artifactId>
<version>${hadoop.version}</version>
<exclusions>
<exclusion>
<artifactId>jdk.tools</artifactId>
<groupId>jdk.tools</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-hdfs</artifactId>
<version>${hadoop.version}</version>
<exclusions>
<exclusion>
<artifactId>jdk.tools</artifactId>
<groupId>jdk.tools</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>${hadoop.version}</version>
<exclusions>
<exclusion>
<artifactId>jdk.tools</artifactId>
<groupId>jdk.tools</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-mapreduce-client-core</artifactId>
<version>${hadoop.version}</version>
</dependency>
</dependencies>
Pom整体
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cn.wxj.hive.jdbc</groupId>
<artifactId>java2hive</artifactId>
<version>1.0-SNAPSHOT</version>
<name>java2hive</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<hadoop.version>2.6.0</hadoop.version>
<hive.version>1.1.0</hive.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.hive</groupId>
<artifactId>hive-jdbc</artifactId>
<version>${hive.version}</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-auth</artifactId>
<version>${hadoop.version}</version>
<exclusions>
<exclusion>
<artifactId>jdk.tools</artifactId>
<groupId>jdk.tools</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-common</artifactId>
<version>${hadoop.version}</version>
<exclusions>
<exclusion>
<artifactId>jdk.tools</artifactId>
<groupId>jdk.tools</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-hdfs</artifactId>
<version>${hadoop.version}</version>
<exclusions>
<exclusion>
<artifactId>jdk.tools</artifactId>
<groupId>jdk.tools</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>${hadoop.version}</version>
<exclusions>
<exclusion>
<artifactId>jdk.tools</artifactId>
<groupId>jdk.tools</groupId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-mapreduce-client-core</artifactId>
<version>${hadoop.version}</version>
</dependency>
</dependencies>
<build>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
<plugin>
<artifactId>maven-site-plugin</artifactId>
<version>3.7.1</version>
</plugin>
<plugin>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>3.0.0</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
datasource.properties文件不需要密码
driver=org.apache.hive.jdbc.HiveDriver
url=jdbc:hive2://192.168.182.131:10000/default
username=root
resources文件夹下新增log4j.properties配置文件，内容为
log4j.rootLogger=INFO, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n
log4j.appender.logfile=org.apache.log4j.FileAppender
log4j.appender.logfile.File=target/hadoop.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n
BaseConfig的init方法稍作改动，将password的默认值改为空
config=new Config();
config.url=url;
config.driver =pro.getProperty("driver","org.apache.hive.jdbc.HiveDriver");
config.username=pro.getProperty("username","root");
config.password=pro.getProperty("password","");
剩下的没有区别
JAVA连接HBase
需要配置windows主机映射
Pom依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cn.kgc.kb10.wxj.hbase</groupId>
<artifactId>hbasejdbc</artifactId>
<version>1.0-SNAPSHOT</version>
<name>hbasejdbc</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<hadoop.version>2.6.0-cdh5.14.2</hadoop.version>
<hive.version>1.1.0-cdh5.14.2</hive.version>
<hbase.version>1.2.0-cdh5.14.2</hbase.version>
</properties>
<repositories>
<repository>
<id>cloudera</id>
<url>https://repository.cloudera.com/artifactory/cloudera-repos/</url>
</repository>
</repositories>
<dependencies>
<!--hadoop-->
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-common</artifactId>
<version>${hadoop.version}</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-client</artifactId>
<version>${hadoop.version}</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-hdfs</artifactId>
<version>${hadoop.version}</version>
</dependency>
<!--日志-->
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<!--MapReduce-->
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-auth</artifactId>
<version>${hadoop.version}</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-mapreduce-client-core</artifactId>
<version>${hadoop.version}</version>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-mapreduce-client-jobclient</artifactId>
<version>${hadoop.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.zookeeper/zookeeper -->
<!--zookeeper-->
<dependency>
<groupId>org.apache.zookeeper</groupId>
<artifactId>zookeeper</artifactId>
<version>3.4.5</version>
<type>pom</type>
</dependency>
<!--hbase-->
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>${hbase.version}</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-common</artifactId>
<version>${hbase.version}</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-server</artifactId>
<version>${hbase.version}</version>
</dependency>
<!--log4j-->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!--测试-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<!--<scope>test</scope>-->
</dependency>
</dependencies>
</project>
代码实现
package cn.kgc.kb10.wxj.hbase;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;
import org.junit.Test;
import java.io.IOException;
public class HBaseClientDemo {
//创建一个表
@Test
public void createTable() throws IOException {
//1.获取hbase连接，配置
Configuration conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum","192.168.182.131");
conf.set("hbase.zookeeper.property.clientPort","2181");
//2.创建连接
Connection conn = ConnectionFactory.createConnection(conf);
//3.创建admin
Admin admin=conn.getAdmin();
//4.创建表的相关信息,表名
HTableDescriptor student = new HTableDescriptor(TableName.valueOf("student100"));
//5.添加列族信息
student.addFamily(new HColumnDescriptor("info"));
student.addFamily(new HColumnDescriptor("score"));
//6.调用创建表的方法进行建表操作
admin.createTable(student);
//7.关闭连接
conn.close();
}
@Test
public void putData2Table() throws IOException {
//1.获取hbase连接，配置
Configuration conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum","192.168.182.131");
conf.set("hbase.zookeeper.property.clientPort","2181");
//2.创建连接
Connection conn = ConnectionFactory.createConnection(conf);
//3.获取table
Table student =conn.getTable(TableName.valueOf("student100"));
//4.表中添加数据rowkey
Put put=new Put(Bytes.toBytes("1001"));
//5.添加列 info:name zhangsan
put.addColumn(Bytes.toBytes("info"),Bytes.toBytes("name"),Bytes.toBytes("zhangsan"));
put.addColumn(Bytes.toBytes("info"),Bytes.toBytes("gender"),Bytes.toBytes("male"));
put.addColumn(Bytes.toBytes("info"),Bytes.toBytes("age"),Bytes.toBytes("11"));
//6.插入数据
student.put(put);
//7.关闭连接
conn.close();
}
//读取数据
@Test
public void getDataFromTable() throws IOException {
//1.获取hbase连接，配置
Configuration conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum","192.168.182.131");
conf.set("hbase.zookeeper.property.clientPort","2181");
//2.创建连接
Connection conn = ConnectionFactory.createConnection(conf);
//3.获取table
Table student =conn.getTable(TableName.valueOf("student100"));
//4.读取数据，Get
Get get = new Get(Bytes.toBytes("1001"));
//5.获取结果
Result result = student.get(get);
//6.遍历
Cell[] cells = result.rawCells();
for (Cell cell : cells) {
System.out.println("rowkey:"+Bytes.toString(CellUtil.cloneRow(cell)));
System.out.println("列族:"+Bytes.toString(CellUtil.cloneFamily(cell)));
System.out.println("列名:"+Bytes.toString(CellUtil.cloneQualifier(cell)));
System.out.println("value:"+Bytes.toString(CellUtil.cloneValue(cell)));
System.out.println("-----------------");
}
conn.close();
}
//删除
@Test
public void dropTable() throws IOException {
//1.获取hbase连接，配置
Configuration conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum","192.168.182.131");
conf.set("hbase.zookeeper.property.clientPort","2181");
//2.创建连接
Connection conn = ConnectionFactory.createConnection(conf);
//3.创建admin
Admin admin=conn.getAdmin();
//4.禁用表
admin.disableTable(TableName.valueOf("student100"));
//5.删除表
admin.deleteTable(TableName.valueOf("student100"));
conn.close();
}
}
最后
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