The premise is that hbase can be used normally.
maven dependencies:
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>1.2.0</version>
</dependency>
<dependency>
<groupId>jdk.tools</groupId>
<artifactId>jdk.tools</artifactId>
<version>1.6</version>
<scope>system</scope>
<systemPath>${JAVA_HOME}/lib/tools.jar</systemPath>
</dependency>
main class
package hbase;
import java.io.File;
import java.io.IOException;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.CellUtil;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.util.Bytes;
public class HBaseClientTest extends ConnectionFactory {
public static void main(String[] args) throws IOException {
/*
* This does nothing but avoids an error in the log (winutil.exe not found). And that error does not affect normal hbase operation.
*/
String hadoopHome=System.getenv("HADOOP_HOME");
String devDefault=new File("client/").getAbsolutePath();
System.setProperty("hadoop.home.dir", hadoopHome==null?devDefault:hadoopHome);
long a=System.currentTimeMillis();
/*
*hbase-site.xml is placed in the classpath.
*/
Configuration config = HBaseConfiguration.create();
System.out.println("get config ed:"+(System.currentTimeMillis()-a)/1000.0);
a=System.currentTimeMillis();
// config.set("hbase.zookeeper.quorum","host10.ticloud");
// config.set("hbase.zookeeper.property.clientPort", "2222");
// config.addResource(new Path("D:\\hadoop\\hadoop_cfg\\", "hbase-site.xml"));
// config.addResource(new Path("D:\\hadoop\\hbase_cfg\\", "core-site.xml"));
Connection connection = ConnectionFactory.createConnection(config);
System.out.println("get cnn ed:"+(System.currentTimeMillis()-a)/1000.0);
a=System.currentTimeMillis();
Table table=null;
try {
table = connection.getTable(TableName.valueOf("t2"));
System.out.println("get table ed:"+(System.currentTimeMillis()-a)/1000.0);
a=System.currentTimeMillis();
// Use the table as needed, for a single operation and a single thread
Put put=new Put(Bytes.toBytes("rowjava"));
put.addColumn(Bytes.toBytes("c2"),Bytes.toBytes("col1"),Bytes.toBytes("value3_6"));
// put.addColumn(Bytes.toBytes("c2"),Bytes.toBytes("col2"),Bytes.toBytes("value3_2"));
// put.addColumn(Bytes.toBytes("c2"),Bytes.toBytes("col3"),Bytes.toBytes("value3_3"));
// put.addColumn(Bytes.toBytes("c2"),Bytes.toBytes("col4"),Bytes.toBytes("value3_4"));
System.out.println("get add ed:"+(System.currentTimeMillis()-a)/1000.0);
a=System.currentTimeMillis();
table.put(put);
System.out.println("get put ed:"+(System.currentTimeMillis()-a)/1000.0);
a=System.currentTimeMillis();
long v=table.incrementColumnValue(Bytes.toBytes("rowjava"),Bytes.toBytes("c2"),Bytes.toBytes("cnt1"),1);//put incr不可混用
System.out.println(v);
System.out.println("get incr ed:"+(System.currentTimeMillis()-a)/1000.0);
a=System.currentTimeMillis();
Get get=new Get(Bytes.toBytes("rowjava"));
Result r=table.get(get);
Cell c=r.getColumnLatestCell(Bytes.toBytes("c2"),Bytes.toBytes("cnt1"));
byte[] bs=CellUtil.cloneValue(c);
System.out.println(Bytes.toLong(bs));
c=r.getColumnLatestCell(Bytes.toBytes("c2"),Bytes.toBytes("col1"));
bs=CellUtil.cloneValue(c);
System.out.println(Bytes.toString(bs));
Put p=new Put(Bytes.toBytes("rowjava"));
p.addColumn(Bytes.toBytes("c2"),Bytes.toBytes("colCheck"),Bytes.toBytes("1"));
boolean suc=table.checkAndPut(Bytes.toBytes("rowjava"), Bytes.toBytes("c2"),Bytes.toBytes("colCheck"),null, p);
System.out.println("checkPut:"+suc);//true, because colCheck did not exist before
suc=table.checkAndPut(Bytes.toBytes("rowjava"), Bytes.toBytes("c2"),Bytes.toBytes("colCheck"),null, p);
System.out.println("checkPut:"+suc);//false , because colCheck existed before
Put p2=new Put(Bytes.toBytes("rowjava"));
p2.addColumn(Bytes.toBytes("c2"),Bytes.toBytes("colCheck"),Bytes.toBytes("2"));
suc=table.checkAndPut(Bytes.toBytes("rowjava"), Bytes.toBytes("c2"),Bytes.toBytes("colCheck"),Bytes.toBytes("1"), p2);
System.out.println("checkPut:"+suc);//true, because colCheck was 1 before
Delete del=new Delete(Bytes.toBytes("rowjava"));
del.addColumn(Bytes.toBytes("c2"),Bytes.toBytes("colCheck"));//Delete the latest version, the colCheck value 2 becomes 1 after deletion.
table.delete(del);
p2=new Put(Bytes.toBytes("rowjava"));
p2.addColumn(Bytes.toBytes("c2"),Bytes.toBytes("colCheck"),Bytes.toBytes("2"));
suc=table.checkAndPut(Bytes.toBytes("rowjava"), Bytes.toBytes("c2"),Bytes.toBytes("colCheck"),Bytes.toBytes("1"), p2);
System.out.println("checkPut:"+suc);//true, because colCheck 2 was deleted before
p2=new Put(Bytes.toBytes("rowjava"));
p2.addColumn(Bytes.toBytes("c2"),Bytes.toBytes("colCheck"),Bytes.toBytes("3"));
suc=table.checkAndPut(Bytes.toBytes("rowjava"), Bytes.toBytes("c2"),Bytes.toBytes("colCheck"),Bytes.toBytes("1"), p2);
System.out.println("checkPut:"+suc);//false, because colCheck was 2 before
del=new Delete(Bytes.toBytes("rowjava"));
//Do not add, that is, delete the entire row, all versions of all cells.
del.addColumns(Bytes.toBytes("c2"),Bytes.toBytes("colCheck"));//Delete the colCheck cell. All versions are deleted
table.delete(del);
} finally {
if(table!=null)table.close();//Close after logic processing
connection.close();//Close when the program is closed, this object can be shared by multiple threads
}
}
}
Attached is the useless winutil.exe to avoid a log prompt:
Could not locate executable null\bin\winutils.exe in the Hadoop binaries.