解除复制粘贴限制
当作者遇到这个限制的时候火气起来了三分,然后去网上搜索答案,然后发现了一位【碳烤小肥肠】居然不贴代码,XX链接,贴截图,瞬时火气冲顶,怒写此文
首先启动万能的控制台,然后Ctrl+Shift+F全局搜索这个弹窗
双击进入源码,随便搞个NB的文件夹,然后点击允许
然后右键这个事儿多的js文件,给它替换了
然后在这儿把这玩意儿代码给注释了,然后保存
最后刷新网页,奇迹出现,可以复制粘贴了【切勿关闭控制台】
第1关:使用 Shell 命令创建表
start-hbase.sh
hbase shell
create 'exam_tb1','student_info','course_info'
put 'exam_tb1', 'row-1', 'student_info:name', 'zhangsan'
put 'exam_tb1', 'row-1', 'student_info:s_no', '2020001'
put 'exam_tb1', 'row-2', 'student_info:name', 'lisi'
put 'exam_tb1', 'row-2', 'student_info:s_no', '2020002'
put 'exam_tb1', 'row-1', 'course_info:c_no', '123001'
put 'exam_tb1', 'row-1', 'course_info:c_name', 'HBase'
put 'exam_tb1', 'row-2', 'course_info:c_no', '123002'
put 'exam_tb1', 'row-2', 'course_info:c_name', 'Hadoop'
exit
echo "scan 'exam_tb1'" | hbase shell >/root/student.txt
第2关:使用 Java API 实现增删操作
package com.yy;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;
import java.util.ArrayList;
import java.util.List;
import java.io.IOException;
public class HbaseUtil {
private static Admin admin = null;
private static Connection connection = null;
private static Configuration conf = null;
static {
// HBase配置文件
conf = HBaseConfiguration.create();
// 获取连接对象
try {
connection = ConnectionFactory.createConnection(conf);
// 获取HBase管理员对象
admin = connection.getAdmin();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private static void close(Connection conn, Admin admin) throws IOException {
if (conn != null) {
conn.close();
}
if (admin != null) {
admin.close();
}
}
//删除exam_tb2表
public void deleteTable() throws IOException {
/**********Begin**********/
admin.disableTable(TableName.valueOf("exam_tb2"));
admin.deleteTable(TableName.valueOf("exam_tb2"));
/**********End**********/
}
//创建exam_tb3表
public void createTab() throws IOException {
/**********Begin**********/
TableName tb3 = TableName.valueOf("exam_tb3");
TableDescriptorBuilder tbd = TableDescriptorBuilder.newBuilder(tb3);
tbd.setColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(Bytes.toBytes("user_info")).build());
tbd.setColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(Bytes.toBytes("address_info")).build());
admin.createTable(tbd.build());
/**********End**********/
}
//往exam_tb3表中添加数据
public void putBatch() throws IOException {
/**********Begin**********/
Table table = connection.getTable(TableName.valueOf("exam_tb3"));
Put p1 = new Put(Bytes.toBytes("1"));
Put p2 = new Put(Bytes.toBytes("2"));
Put p3 = new Put(Bytes.toBytes("3"));
p1.addColumn(Bytes.toBytes("user_info"), Bytes.toBytes("name"), Bytes.toBytes("Avatar"));
p1.addColumn(Bytes.toBytes("user_info"), Bytes.toBytes("age"), Bytes.toBytes("100"));
p1.addColumn(Bytes.toBytes("address_info"), Bytes.toBytes("address"), Bytes.toBytes("pandora"));
p1.addColumn(Bytes.toBytes("address_info"), Bytes.toBytes("email"), Bytes.toBytes("avatar@163.com"));
p1.addColumn(Bytes.toBytes("address_info"), Bytes.toBytes("phone"), Bytes.toBytes("123456"));
p2.addColumn(Bytes.toBytes("user_info"), Bytes.toBytes("name"), Bytes.toBytes("change"));
p2.addColumn(Bytes.toBytes("user_info"), Bytes.toBytes("age"), Bytes.toBytes("50"));
p2.addColumn(Bytes.toBytes("address_info"), Bytes.toBytes("address"), Bytes.toBytes("moon"));
p2.addColumn(Bytes.toBytes("address_info"), Bytes.toBytes("email"), Bytes.toBytes("change@163.com"));
p2.addColumn(Bytes.toBytes("address_info"), Bytes.toBytes("phone"), Bytes.toBytes("234567"));
p3.addColumn(Bytes.toBytes("user_info"), Bytes.toBytes("name"), Bytes.toBytes("nezha"));
p3.addColumn(Bytes.toBytes("user_info"), Bytes.toBytes("age"), Bytes.toBytes("6"));
p3.addColumn(Bytes.toBytes("address_info"), Bytes.toBytes("address"), Bytes.toBytes("earth"));
p3.addColumn(Bytes.toBytes("address_info"), Bytes.toBytes("email"), Bytes.toBytes("nezha@163.com"));
p3.addColumn(Bytes.toBytes("address_info"), Bytes.toBytes("phone"), Bytes.toBytes("345678"));
ArrayList < Put > puts = new ArrayList < > ();
puts.add(p1);
puts.add(p2);
puts.add(p3);
table.put(puts);
/**********End**********/
}
}
第3关:HBase扫描
package step3;
import java.io.IOException;
import org.apache.hadoop.conf.*;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.*;
public class Task {
public void scanTable(String tableName) throws Exception {
/********* Begin *********/
Configuration config = HBaseConfiguration.create();
Connection conn = ConnectionFactory.createConnection(config);
Admin admin = conn.getAdmin();
TableName name = TableName.valueOf(tableName);
Table table = conn.getTable(name);
Scan scan = new Scan();
scan.addColumn(Bytes.toBytes("info"), Bytes.toBytes("name"));
scan.setStartRow(Bytes.toBytes("row-10"));
scan.setStopRow(Bytes.toBytes("row-30"));
ResultScanner scanner = table.getScanner(scan);
for (Result result: scanner) {
for (Cell cell: result.listCells()) {
String family = Bytes.toString(CellUtil.cloneFamily(cell));
String qualifier = Bytes.toString(CellUtil.cloneQualifier(cell));
String value = Bytes.toString(CellUtil.cloneValue(cell));
System.out.println("Rowkey:" + Bytes.toString(result.getRow()) + ",ColumuFamily:" + family + ",Column:" + qualifier + ",Value:" + value);
/********* End *********/
}
}
}
}
第4关:HBase过滤器
package step4;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
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.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.util.Bytes;
public class Task {
public void query(String tName) throws Exception {
/********* Begin *********/
Configuration conf = HBaseConfiguration.create();
Connection connection = ConnectionFactory.createConnection(conf);
try {
Table table = connection.getTable(TableName.valueOf(tName));
Scan scan = new Scan();
ResultScanner scanner = table.getScanner(scan);
for (Result result : scanner) {
byte[] row = result.getRow();
String rowKey = Bytes.toString(row);
result.listCells().forEach(cell -> {
String family = Bytes.toString(cell.getFamilyArray(), cell.getFamilyOffset(), cell.getFamilyLength());
String qualifier = Bytes.toString(cell.getQualifierArray(), cell.getQualifierOffset(), cell.getQualifierLength());
String value = Bytes.toString(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength());
System.out.println(String.format("Rowkey:%s,ColumuFamily:%s,Column:%s,Value:%s", rowKey, family, qualifier, value));
});
}
scanner.close();
table.close();
} finally {
connection.close();
}
/********* End *********/
}
}