Java链接HBASE数据库，创建一个表，删除一张表，修改表，输出插入，修改，数据删除，数据获取，显示表信息，过滤查询，分页查询，地理hash...

最新推荐文章于 2024-11-12 09:28:42 发布

转载最新推荐文章于 2024-11-12 09:28:42 发布 · 73 阅读

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原文链接：http://www.cnblogs.com/sy646et/p/7197678.html

文章标签：

#大数据 #数据库 #java

本文详细介绍使用Java API与HBase交互的过程，包括创建表、插入数据、查询数据等核心操作，并提供了完整的代码示例。

准备工作
1、创建Java的Maven项目
创建好的目录结构如下：
这里写图片描述

另外注意junit的版本，最好不要太高，最开始笔者使用的junit4.12的，发现运行的时候会报错。最后把Junit的版本改成4.7的之后，问题解决了。

创建测试工具类HbaseDemo,为了保证能够让Hbase运行，需要最开始写出如下配置：

package toto.com.hbase;

import java.util.ArrayList; import java.util.Iterator; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.Cell; import org.apache.hadoop.hbase.CellScanner; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.HColumnDescriptor; import org.apache.hadoop.hbase.HTableDescriptor; import org.apache.hadoop.hbase.TableName; import org.apache.hadoop.hbase.client.Admin; 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.ResultScanner; import org.apache.hadoop.hbase.client.Scan; import org.apache.hadoop.hbase.client.Table; import org.apache.hadoop.hbase.filter.BinaryComparator; import org.apache.hadoop.hbase.filter.BinaryPrefixComparator; import org.apache.hadoop.hbase.filter.ByteArrayComparable; import org.apache.hadoop.hbase.filter.ColumnPrefixFilter; import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp; import org.apache.hadoop.hbase.filter.FamilyFilter; import org.apache.hadoop.hbase.filter.Filter; import org.apache.hadoop.hbase.filter.FilterList; import org.apache.hadoop.hbase.filter.FilterList.Operator; import org.apache.hadoop.hbase.filter.MultipleColumnPrefixFilter; import org.apache.hadoop.hbase.filter.PageFilter; import org.apache.hadoop.hbase.filter.PrefixFilter; import org.apache.hadoop.hbase.filter.QualifierFilter; import org.apache.hadoop.hbase.filter.RegexStringComparator; import org.apache.hadoop.hbase.filter.RowFilter; import org.apache.hadoop.hbase.filter.SingleColumnValueFilter; import org.apache.hadoop.hbase.filter.SubstringComparator; import org.apache.hadoop.hbase.regionserver.BloomType; import org.apache.hadoop.hbase.util.Bytes; import org.junit.Before; import org.junit.Test; /** * 代码说明 * * @author tuzq * @create 2017-06-22 20:48 */ public class HbaseDemo { private Configuration conf = null; private Connection conn = null; @Before public void init() throws Exception { conf = HBaseConfiguration.create(); conn = ConnectionFactory.createConnection(); } }

2、创建一个表

@Test
    public void testCreate() throws Exception { //获取一个表管理器 Admin admin = conn.getAdmin(); //表的描述器 HTableDescriptor htd = new HTableDescriptor(TableName.valueOf("t_user_info")); //列族的描述器 HColumnDescriptor hcd1 = new HColumnDescriptor("base_info"); //BloomType.ROW 快速搜索一个数据在哪个文件块中 hcd1.setBloomFilterType(BloomType.ROW).setVersions(1,3); //列族的描述器 HColumnDescriptor hcd2 = new HColumnDescriptor("extra_info"); hcd2.setBloomFilterType(BloomType.ROW).setVersions(1,3); //添加列族 htd.addFamily(hcd1).addFamily(hcd2); //创建表 admin.createTable(htd); admin.close(); conn.close(); }

运行后的成功的结果状态：
这里写图片描述
进入hbase中，查看数据信息

3、删除一张表

@Test
    public void testDrop() throws Exception {
        Admin admin = conn.getAdmin();
        admin.disableTable(TableName.valueOf("t_user_info2")); admin.deleteTable(TableName.valueOf("t_user_info2")); admin.close(); conn.close(); }

执行后的效果如下：
这里写图片描述
进入HBASE中查看效果：

4.其它操作api

@Test
    public void testModify() throws Exception {
        Admin admin = conn.getAdmin();
        // 修改已有ColumnFamily
        HTableDescriptor table = admin.getTableDescriptor(TableName.valueOf("t_user_info")); HColumnDescriptor f2 = table.getFamily("extra_info".getBytes()); f2.setBloomFilterType(BloomType.ROWCOL); // 添加新的ColumnFamily table.addFamily(new HColumnDescriptor("other_info")); admin.modifyTable(TableName.valueOf("t_user_info"), table); admin.close(); conn.close(); } /** * 插入/修改 数据 * @throws Exception */ @Test public void testPut() throws Exception { Table table = conn.getTable(TableName.valueOf("t_user_info")); ArrayList<Put> puts = new ArrayList<Put>(); Put put01 = new Put(Bytes.toBytes("user001")); put01.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("zhangsan")); Put put02 = new Put("user001".getBytes()); put02.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("password"), Bytes.toBytes("123456")); Put put03 = new Put("user002".getBytes()); put03.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("lisi")); put03.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("married"), Bytes.toBytes("false")); Put put04 = new Put("zhang_sh_01".getBytes()); put04.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("zhang01")); put04.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("married"), Bytes.toBytes("false")); Put put05 = new Put("zhang_sh_02".getBytes()); put05.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("zhang02")); put05.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("married"), Bytes.toBytes("false")); Put put06 = new Put("liu_sh_01".getBytes()); put06.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("liu01")); put06.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("married"), Bytes.toBytes("false")); Put put07 = new Put("zhang_bj_01".getBytes()); put07.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("zhang03")); put07.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("married"), Bytes.toBytes("false")); Put put08 = new Put("zhang_bj_01".getBytes()); put08.addColumn(Bytes.toBytes("base_info"), Bytes.toBytes("username"), Bytes.toBytes("zhang04")); put08.addColumn(Bytes.toBytes("extra_info"), Bytes.toBytes("married"), Bytes.toBytes("false")); puts.add(put01); puts.add(put02); puts.add(put03); puts.add(put04); puts.add(put05); puts.add(put06); puts.add(put07); puts.add(put08); table.put(puts); table.close(); conn.close(); } @Test public void testDel() throws Exception { Table t_user_info = conn.getTable(TableName.valueOf("t_user_info")); Delete delete = new Delete("user001".getBytes()); delete.addColumn("base_info".getBytes(), "password".getBytes()); t_user_info.delete(delete); t_user_info.close(); conn.close(); }

@Test
    public void testGet() throws Exception {
        Table table = conn.getTable(TableName.valueOf("t_user_info"));

        Get get = new Get("user001".getBytes()); Result result = table.get(get); CellScanner cellScanner = result.cellScanner(); while(cellScanner.advance()) { Cell current = cellScanner.current(); byte[] familyArray = current.getFamilyArray(); byte[] qualifierArray = current.getQualifierArray(); byte[] valueArray = current.getValueArray(); System.out.println(new String(familyArray,current.getFamilyLength(),current.getFamilyLength())); System.out.print(":" + new String(qualifierArray, current.getQualifierOffset(), current.getQualifierLength())); System.out.print(":" + new String(qualifierArray, current.getQualifierOffset(), current.getQualifierLength())); } table.close(); table.close(); }

运行结果：
这里写图片描述

@Test
    public void testScan() throws Exception {
        Table t_user_info = conn.getTable(TableName.valueOf("t_user_info"));
        Scan scan = new Scan(); ResultScanner scanner = t_user_info.getScanner(scan); Iterator<Result> iter = scanner.iterator(); while (iter.hasNext()) { Result result = iter.next(); CellScanner cellScanner = result.cellScanner(); while(cellScanner.advance()) { Cell current = cellScanner.current(); byte[] familyArray = current.getFamilyArray(); byte[] valueArray = current.getValueArray(); byte[] qualifierArray = current.getQualifierArray(); byte[] rowArray = current.getRowArray(); System.out.println(new String(rowArray, current.getRowOffset(), current.getRowLength())); System.out.print(new String(familyArray, current.getFamilyOffset(), current.getFamilyLength())); System.out.print(":" + new String(qualifierArray, current.getQualifierOffset(), current.getQualifierLength())); System.out.println(" " + new String(valueArray, current.getValueOffset(), current.getValueLength())); } System.out.println("-----------------------"); } }

运行结果：
这里写图片描述

其它代码（过滤，扫描，分页查询）：

/**
     * 下面的内容一个注释一个注释的放开，然后可以看到过滤后的效果
     * @throws Exception
     */
    @Test
    public void testFilter() throws Exception { // 针对行键的前缀过滤器 /*Filter pf = new PrefixFilter(Bytes.toBytes("liu")); testScan(pf);*/ // 行过滤器 /*RowFilter rf1 = new RowFilter(CompareOp.LESS, new BinaryComparator(Bytes.toBytes("user001"))); RowFilter rf2 = new RowFilter(CompareOp.EQUAL, new SubstringComparator("00")); testScan(rf1); System.out.println("**********"); testScan(rf2);*/ // 针对指定一个列的value来过滤 /*SingleColumnValueFilter scvf = new SingleColumnValueFilter("base_info".getBytes(), "password".getBytes(), CompareOp.EQUAL, "123456".getBytes()); scvf.setFilterIfMissing(true); // 如果指定的列缺失，则也过滤掉 testScan(scvf);*/ /*ByteArrayComparable comparator1 = new RegexStringComparator("^zhang"); ByteArrayComparable comparator2 = new SubstringComparator("ang"); SingleColumnValueFilter scvf = new SingleColumnValueFilter("base_info".getBytes(), "username".getBytes(), CompareOp.EQUAL, comparator1); testScan(scvf);*/ // 针对列族名的过滤器 /*FamilyFilter ff1 = new FamilyFilter(CompareOp.EQUAL, new BinaryComparator(Bytes.toBytes("inf"))); FamilyFilter ff2 = new FamilyFilter(CompareOp.EQUAL, new BinaryPrefixComparator(Bytes.toBytes("base"))); testScan(ff1);*/ // 针对列名的过滤器 /*QualifierFilter qf = new QualifierFilter(CompareOp.EQUAL, new BinaryComparator(Bytes.toBytes("password"))); QualifierFilter qf2 = new QualifierFilter(CompareOp.EQUAL, new BinaryPrefixComparator(Bytes.toBytes("us"))); testScan(qf);*/ // 跟SingleColumnValueFilter结果不同，只返回符合条件的该column /*ColumnPrefixFilter cf = new ColumnPrefixFilter("passw".getBytes()); testScan(cf);*/ /*byte[][] prefixes = new byte[][] { Bytes.toBytes("username"),Bytes.toBytes("password") }; MultipleColumnPrefixFilter mcf = new MultipleColumnPrefixFilter(prefixes); testScan(mcf);*/ /*FamilyFilter ff2 = new FamilyFilter(CompareOp.EQUAL, new BinaryPrefixComparator(Bytes.toBytes("base"))); ColumnPrefixFilter cf = new ColumnPrefixFilter("passw".getBytes()); FilterList filterList = new FilterList(Operator.MUST_PASS_ALL); filterList.addFilter(ff2); filterList.addFilter(cf); testScan(filterList);*/ } public void testScan(Filter filter) throws Exception { Table t_user_info = conn.getTable(TableName.valueOf("t_user_info")); Scan scan = new Scan(); scan.setFilter(filter); ResultScanner scanner = t_user_info.getScanner(scan); Iterator<Result> iter = scanner.iterator(); while (iter.hasNext()) { Result result = iter.next(); CellScanner cellScanner = result.cellScanner(); while (cellScanner.advance()) { Cell current = cellScanner.current(); byte[] familyArray = current.getFamilyArray(); byte[] valueArray = current.getValueArray(); byte[] qualifierArray = current.getQualifierArray(); byte[] rowArray = current.getRowArray(); System.out.println(new String(rowArray, current.getRowOffset(), current.getRowLength())); System.out.print(new String(familyArray, current.getFamilyOffset(), current.getFamilyLength())); System.out.print(":" + new String(qualifierArray, current.getQualifierOffset(), current.getQualifierLength())); System.out.println(" " + new String(valueArray, current.getValueOffset(), current.getValueLength())); } System.out.println("-----------------------"); } } /** * 分页查询 * * @throws Exception */ @Test public void pageScan() throws Exception{ final byte[] POSTFIX = new byte[] { 0x00 }; Table table = conn.getTable(TableName.valueOf("t_user_info")); Filter filter = new PageFilter(3); // 一次需要获取一页的条数 byte[] lastRow = null; int totalRows = 0; while (true) { Scan scan = new Scan(); scan.setFilter(filter); if(lastRow != null){ byte[] startRow = Bytes.add(lastRow,POSTFIX); //设置本次查询的起始行键 scan.setStartRow(startRow); } ResultScanner scanner = table.getScanner(scan); int localRows = 0; Result result; while((result = scanner.next()) != null){ System.out.println(localRows++ + ":" + result); totalRows ++; lastRow = result.getRow(); } scanner.close(); if(localRows == 0) break; Thread.sleep(2000); } System.out.println("total rows:" + totalRows); } public static void main(String[] args) throws Exception { HbaseDemo demo = new HbaseDemo(); demo.init(); demo.testScan(); }

地理hash的代码：


import java.util.BitSet;
import java.util.HashMap;

public class Geohash {

    private static int numbits = 6 * 5; final static char[] digits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' }; final static HashMap<Character, Integer> lookup = new HashMap<Character, Integer>(); static { int i = 0; for (char c : digits) lookup.put(c, i++); }http://www.woaipu.com/shops/zuzhuan/61406 public double[] decode(String geohash) { StringBuilder buffer = new StringBuilder(); for (char c : geohash.toCharArray()) { int i = lookup.get(c) + 32; buffer.append(Integer.toString(i, 2).substring(1)); } BitSet lonset = new BitSet(); BitSet latset = new BitSet(); http://www.woaipu.com/shops/zuzhuan/61406 // even bits int j = 0; for (int i = 0; i < numbits * 2; i += 2) { boolean isSet = false; if (i < buffer.length()) isSet = buffer.charAt(i) == '1'; lonset.set(j++, isSet); } // odd bits j = 0; for (int i = 1; i < numbits * 2; i += 2) { boolean isSet = false; if (i < buffer.length()) isSet = buffer.charAt(i) == '1'; latset.set(j++, isSet); } // 中国地理坐标：东经73°至东经135°，北纬4°至北纬53° double lon = decode(lonset, 70, 140); double lat = decode(latset, 0, 60); return new double[] { lat, lon }; } private double decode(BitSet bs, double floor, double ceiling) { double mid = 0; for (int i = 0; i < bs.length(); i++) { mid = (floor + ceiling) / 2; if (bs.get(i)) floor = mid; else ceiling = mid; } return mid; } public String encode(double lat, double lon) { BitSet latbits = getBits(lat, 0, 60); BitSet lonbits = getBits(lon, 70, 140); StringBuilder buffer = new StringBuilder(); for (int i = 0; i < numbits; i++) { buffer.append((lonbits.get(i)) ? '1' : '0'); buffer.append((latbits.get(i)) ? '1' : '0'); } return base32(Long.parseLong(buffer.toString(), 2)); } private BitSet getBits(double lat, double floor, double ceiling) { BitSet buffer = new BitSet(numbits); for (int i = 0; i < numbits; i++) { double mid = (floor + ceiling) / 2; if (lat >= mid) { buffer.set(i); floor = mid; } else { ceiling = mid; } } return buffer; } public static String base32(long i) { char[] buf = new char[65]; int charPos = 64; boolean negative = (i < 0); if (!negative) i = -i; while (i <= -32) { buf[charPos--] = digits[(int) (-(i % 32))]; i /= 32;http://www.woaipu.com/shops/zuzhuan/61406 }http://www.woaipu.com/shops/zuzhuan/61406 buf[charPos] = digits[(int) (-i)]; if (negative) buf[--charPos] = '-'; return new String(buf, charPos, (65 - charPos)); } public static void main(String[] args) { Geohash geohash = new Geohash(); String encode1 = geohash.encode(123.3345, 78.2247); String encode2 = geohash.encode(123.3446, 78.2249); String encode3 = geohash.encode(120.3346, 108.2249); System.out.println(encode1); System.out.println(encode2); System.out.println(encode3); }
http://www.woaipu.com/shops/zuzhuan/61406
http://www.woaipu.com/shops/zuzhuan/61406