HBase项目实战系列(1) | Weibo项目简易版(附全代码)
【摘要】
大家好，我是不温卜火，是一名计算机学院大数据专业大二的学生，昵称来源于成语—不温不火，本意是希望自己性情温和。作为一名互联网行业的小白，博主写博客一方面是为了记录自己的学习过程，另一方面是总结自己所犯的错误希望能够帮助到很多和自己一样处于起步阶段的萌新。但由于水平有限，博客中难免会有一些错误出现，有纰漏之处恳请各位大佬不吝赐教！暂时只有csdn这一个平台，博客...
大家好，我是不温卜火，是一名计算机学院大数据专业大二的学生，昵称来源于成语—
不温不火，本意是希望自己性情温和。作为一名互联网行业的小白，博主写博客一方面是为了记录自己的学习过程，另一方面是总结自己所犯的错误希望能够帮助到很多和自己一样处于起步阶段的萌新。但由于水平有限，博客中难免会有一些错误出现，有纰漏之处恳请各位大佬不吝赐教！暂时只有csdn这一个平台，博客主页：https://buwenbuhuo.blog.csdn.net/
此篇为大家带来的是HBase项目实战系列(1) | Weibo项目简易版(附全代码)。
标注：
此处为反爬虫标记：读者可自行忽略
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原文地址：https://buwenbuhuo.blog.csdn.net/
1. 需求分析
1.微博内容的浏览，数据库表设计
2.用户社交体现：关注用户，取关用户
3.拉取关注的人的微博内容
微博表的分析
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- 2. 项目所需要的表
2. 代码实现
1. 代码设计总览
// 一.创建
1.创建命名空间以及表名的定义
2.创建微博内容表
3.创建用户关系表
4.创建用户微博内容接收邮件表
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// 二. 测试
5.发布微博内容
6.添加关注用户
7.移除（取关）用户
8.获取关注的人的微博内容
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2.
2. 创建项目及添加依赖
- 创建项目结构如下图
- 依赖
<build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>8</source> <target>8</target> </configuration> </plugin> </plugins> </build> <dependencies> <dependency> <groupId>org.apache.hbase</groupId> <artifactId>hbase-client</artifactId> <version>1.3.1</version> </dependency> </dependencies>
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3. 创建
- 1. WeiboDao
package com.buwenbuhuo.hbase.weibo.dao;
import com.buwenbuhuo.hbase.weibo.constant.Names;
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 java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* @author 卜温不火
* @create 2020-05-13 21:25
* com.buwenbuhuo.hbase.weibo.dao - the name of the target package where the new class or interface will be created.
* weibo0513 - the name of the current project.
*/
public class WeiboDao { public static Connection connection = null; static { try { Configuration conf = HBaseConfiguration.create(); conf.set("hbase.zookeeper.quorum", "hadoop002,hadoop003,hadoop004"); connection = ConnectionFactory.createConnection(conf); }catch (IOException e){ e.printStackTrace(); } } public void createNamespace(String namespace) throws IOException { Admin admin = connection.getAdmin(); NamespaceDescriptor namespce = NamespaceDescriptor.create(namespace).build(); admin.createNamespace(namespce); admin.close(); } public void createTable(String tableName, String... families) throws IOException { // 因为下面的存在，此处可以省略 createTable(tableName,1,families); } public void createTable(String tableName,Integer versions, String... families) throws IOException { Admin admin = connection.getAdmin(); HTableDescriptor table = new HTableDescriptor(TableName.valueOf(tableName)); for (String family : families) { HColumnDescriptor familyDesc = new HColumnDescriptor(family); familyDesc.setMaxVersions(versions); table.addFamily(familyDesc); } admin.createTable(table); admin.close(); } public void putCell(String tableName, String rowKey, String family, String column, String value) throws IOException { Table table = connection.getTable(TableName.valueOf(tableName)); Put put = new Put(Bytes.toBytes(rowKey)); put.addColumn(Bytes.toBytes(family),Bytes.toBytes(column),Bytes.toBytes(value)); table.put(put); table.close(); } public List<String> getRowKeysByPrefix(String tableName, String prefix) throws IOException { ArrayList<String> list = new ArrayList<>(); Table table = connection.getTable(TableName.valueOf(tableName)); Scan scan = new Scan(); scan.setRowPrefixFilter(Bytes.toBytes(prefix)); ResultScanner scanner = table.getScanner(scan); for (Result result : scanner) { byte[] row = result.getRow(); String rowKey = Bytes.toString(row); list.add(rowKey); } scanner.close(); table.close(); return list; } public void putCells(String tableName, List<String> rowKeys, String family, String column, String value) throws IOException { Table table = connection.getTable(TableName.valueOf(tableName)); ArrayList<Put> puts = new ArrayList<>(); // 遍历RowKeys for (String rowKey : rowKeys) { Put put = new Put(Bytes.toBytes(rowKey)); put.addColumn(Bytes.toBytes(family),Bytes.toBytes(column),Bytes.toBytes(value)); puts.add(put); } table.put(puts); table.close(); } public List<String> getRowKeysByRange(String tableName, String startRow, String stopRow) throws IOException { List<String> list = new ArrayList<>(); Table table = connection.getTable(TableName.valueOf(tableName)); Scan scan = new Scan(Bytes.toBytes(startRow), Bytes.toBytes(stopRow)); ResultScanner scanner = table.getScanner(scan); for (Result result : scanner) { byte[] row = result.getRow(); String rowKey = Bytes.toString(row); list.add(rowKey); } scanner.close(); table.close(); return list; } public void deleteRow(String tableName, String rowKey) throws IOException { Table table = connection.getTable(TableName.valueOf(tableName)); Delete delete = new Delete(Bytes.toBytes(rowKey)); table.delete(delete); table.close(); } public void deleteCells(String tableName, String rowKey, String family, String column) throws IOException { Table table = connection.getTable(TableName.valueOf(tableName)); Delete delete = new Delete(Bytes.toBytes(rowKey)); delete.addColumns(Bytes.toBytes(family),Bytes.toBytes(column)); table.delete(delete); table.close(); } public List<String> getCellsByPrefix(String tableName, String prefix, String family, String column) throws IOException { List<String> list = new ArrayList<>(); Table table = connection.getTable(TableName.valueOf(tableName)); Scan scan = new Scan(); scan.setRowPrefixFilter(Bytes.toBytes(prefix)); scan.addColumn(Bytes.toBytes(family),Bytes.toBytes(column)); ResultScanner scanner = table.getScanner(scan); for (Result result : scanner) { Cell[] cells = result.rawCells(); list.add(Bytes.toString(CellUtil.cloneValue(cells[0]))); } scanner.close(); table.close(); return list; } public List<String> getFamilyByRowKey(String tableName, String rowKey, String family) throws IOException { List<String> list = new ArrayList<>(); Table table = connection.getTable(TableName.valueOf(tableName)); Get get = new Get(Bytes.toBytes(rowKey)); get.setMaxVersions(Names.INBOX_DATA_VERSIONS); get.addFamily(Bytes.toBytes(family)); Result result = table.get(get); for (Cell cell : result.rawCells()) { list.add(Bytes.toString(CellUtil.cloneValue(cell))); } table.close(); return list; } public List<String> getCellsByRowKey(String tableName, List<String> rowKeys, String family, String column) throws IOException { List<String> weibos = new ArrayList<>(); Table table = connection.getTable(TableName.valueOf(tableName)); List<Get> gets = new ArrayList<>(); for (String rowKey : rowKeys) { Get get = new Get(Bytes.toBytes(rowKey)); get.addColumn(Bytes.toBytes(family),Bytes.toBytes(column)); gets.add(get); } Result[] results = table.get(gets); for (Result result : results) { String weibo = Bytes.toString(CellUtil.cloneValue(result.rawCells()[0])); weibos.add(weibo); } table.close(); return weibos; }
}
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- 2. WeiboService
package com.buwenbuhuo.hbase.weibo.service;
import com.buwenbuhuo.hbase.weibo.constant.Names;
import com.buwenbuhuo.hbase.weibo.dao.WeiboDao;
import javax.naming.Name;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* @author 卜温不火
* @create 2020-05-13 21:27
* com.buwenbuhuo.hbase.weibo.service - the name of the target package where the new class or interface will be created.
* weibo0513 - the name of the current project.
*/
public class WeiboService { private WeiboDao dao = new WeiboDao(); public void init() throws IOException { //1) 创建命名空间以及表名的定义 dao.createNamespace(Names.NAMESPACE_WEIBO); //2) 创建微博内容表 dao.createTable(Names.TABLE_WEIBO,Names.WEIBO_FAMILY_DATA); //3) 创建用户关系表 dao.createTable(Names.TABLE_RELATION,Names.RELATION_FAMILY_DATA); //4) 创建用户微博内容接收邮件表 dao.createTable(Names.TABLE_INBOX,Names.INBOX_DATA_VERSIONS,Names.INBOX_FAMILY_DATA); } public void publish(String star, String content) throws IOException { // 1. 在weibo表中插入一条数据 String rowKey = star + "_" + System.currentTimeMillis(); dao.putCell(Names.TABLE_WEIBO,rowKey,Names.WEIBO_FAMILY_DATA,Names.WEIBO_COLUMN_CONTENT,content); // 2. 从relation表中获取star的所有fansID (默认有粉丝逻辑有些问题) String prefix = star+":followedby:"; List<String> list = dao.getRowKeysByPrefix(Names.TABLE_RELATION,prefix); if (list.size()<= 0){ return; } List<String> fansIds = new ArrayList<>(); // 遍历 for (String row : list) { String[] split = row.split(":"); // 获取粉丝ID fansIds.add(split[2]); } // 3. 向所有fans的inbox中插入本条weibo的id // 循环调用 or 批量调用 dao.putCells(Names.TABLE_INBOX,fansIds,Names.INBOX_FAMILY_DATA,star,rowKey); } public void follow(String fans, String star) throws IOException { // 1. 向relation表中插入两条数据 String rowKey1 = fans + ":follow:" + star; String rowKey2 = star + ":followedby:" + fans; String time = System.currentTimeMillis() + ""; dao.putCell(Names.TABLE_RELATION,rowKey1,Names.RELATION_FAMILY_DATA,Names.RELATION_COLUMN_TIME,time); dao.putCell(Names.TABLE_RELATION,rowKey2,Names.RELATION_FAMILY_DATA,Names.RELATION_COLUMN_TIME,time); // 2. 从weibo表中获取star的近期weibo // 拿取所有 String startRow = star; String stopRow = star + "|"; List<String> list = dao.getRowKeysByRange(Names.TABLE_WEIBO,startRow,stopRow); // 判断 if (list.size() <= 0){ return; } // 获取近期的weibo // 使用三元运算符进行判断 int fromIndex = list.size() > Names.INBOX_DATA_VERSIONS?list.size()-Names.INBOX_DATA_VERSIONS:0; List<String> recentWeiboIds = list.subList(fromIndex, list.size()); // 3. 向fans的inbox表中插入star的近期weiboId for (String recentWeiboId : recentWeiboIds) { dao.putCell(Names.TABLE_INBOX,fans, Names.INBOX_FAMILY_DATA,star,recentWeiboId); } } public void unFollow(String fans, String star) throws IOException { // 1. 删除relation表中的两条数据 String rowKey1 = fans + ":follow:" + star; String rowKey2 = star + ":followedby:" + fans; dao.deleteRow(Names.TABLE_RELATION,rowKey1); dao.deleteRow(Names.TABLE_RELATION,rowKey2); // 2. 删除inbox表中的一列 dao.deleteCells(Names.TABLE_INBOX,fans,Names.INBOX_FAMILY_DATA,star); } public List<String> getAllWeiboByUserId(String star) throws IOException { return dao.getCellsByPrefix(Names.TABLE_WEIBO,star,Names.WEIBO_FAMILY_DATA,Names.WEIBO_COLUMN_CONTENT); } public List<String> getAllRecentWeibos(String fans) throws IOException { // 1. 从inbox中获取fans的所有的star的近期weiboId List<String> list = dao.getFamilyByRowKey(Names.TABLE_INBOX,fans,Names.INBOX_FAMILY_DATA); // 2. 根据weiboID去weibo表中查询内容 return dao.getCellsByRowKey(Names.TABLE_WEIBO,list,Names.WEIBO_FAMILY_DATA,Names.WEIBO_COLUMN_CONTENT); }
}
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- 3. Names
package com.buwenbuhuo.hbase.weibo.constant; /**
* @author 卜温不火
* @create 2020-05-13 23:28
* com.buwenbuhuo.hbase.weibo.constant - the name of the target package where the new class or interface will be created.
* weibo0513 - the name of the current project.
*/
public class Names { public final static String NAMESPACE_WEIBO = "weibo"; public final static String TABLE_WEIBO = "weibo:weibo"; public final static String TABLE_RELATION = "weibo:relation"; public final static String TABLE_INBOX = "weibo:inbox"; public final static String WEIBO_FAMILY_DATA = "data"; public final static String RELATION_FAMILY_DATA = "data"; public final static String INBOX_FAMILY_DATA = "data"; public final static String WEIBO_COLUMN_CONTENT = "content"; public final static String RELATION_COLUMN_TIME = "time"; public final static Integer INBOX_DATA_VERSIONS = 3;
}
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- 4. WeiboController
package com.buwenbuhuo.hbase.weibo.controller;
import com.buwenbuhuo.hbase.weibo.service.WeiboService;
import java.io.IOException;
import java.util.List;
/**
* @author 卜温不火
* @create 2020-05-13 21:27
* com.buwenbuhuo.hbase.weibo.controller - the name of the target package where the new class or interface will be created.
* weibo0513 - the name of the current project.
*/
public class WeiboController { private WeiboService service = new WeiboService(); public void init() throws IOException { service.init(); } //5) 发布微博内容 public void publish(String star,String content) throws IOException { service.publish(star,content); } //6) 添加关注用户 public void follow(String fans,String star) throws IOException { service.follow(fans,star); } //7) 移除（取关）用户 public void unFollow(String fans,String star) throws IOException { service.unFollow(fans,star); } //8) 获取关注的人的微博内容 // 8.1 获取某个明星的所有weibo public List<String> getAllWeibosByUserID(String star) throws IOException { return service.getAllWeiboByUserId(star); } // 8.2 获取关注的所有star的近期weibo public List<String> getAllRecentWeibos(String fans) throws IOException { return service.getAllRecentWeibos(fans); } }
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- 5. WeiboAPP
package com.buwenbuhuo.hbase.weibo;
import com.buwenbuhuo.hbase.weibo.controller.WeiboController;
import java.io.IOException;
import java.util.List;
/**
* @author 卜温不火
* @create 2020-05-13 21:24
* com.buwenbuhuo.hbase.weibo - the name of the target package where the new class or interface will be created.
* weibo0513 - the name of the current project.
*/
public class WeiboAPP { private static WeiboController controller = new WeiboController(); public static void main(String[] args) throws IOException { // 1. 创建表的初始化
// controller.init(); // 2. 发微博(发五条微博)
// controller.publish("buwenbuhuo","Happy 1");
// controller.publish("buwenbuhuo","Happy 2");
// controller.publish("buwenbuhuo","Happy 3");
// controller.publish("buwenbuhuo","Happy 4");
// controller.publish("buwenbuhuo","Happy 5"); // 3. 关注微博
// controller.follow("1002","buwenbuhuo");
// controller.follow("1003","buwenbuhuo"); // 4. 获取微博内容 // 最新的消息(获取)
// List<String> allRecentWeibos = controller.getAllRecentWeibos("1002"); // 查看数据
// for (String allRecentWeibo : allRecentWeibos) {
// System.out.println(allRecentWeibo);
// } // 5. 取关微博
// controller.unFollow("1002","buwenbuhuo"); // 查看数据
// for (String allRecentWeibo : allRecentWeibos) {
// System.out.println(allRecentWeibo);
// } // 6. 获取某一个人的所有微博
// List<String> allWeibosByUserID = controller.getAllWeibosByUserID("buwenbuhuo");
//
// for (String s : allWeibosByUserID) {
// System.out.println(s);
// } }
}
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4. 测试
- 1. 建表的初始化
// 1. 创建表的初始化 controller.init();
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- 2. 发微博
// 2. 发微博(发五条微博) controller.publish("buwenbuhuo","Happy 1"); controller.publish("buwenbuhuo","Happy 2"); controller.publish("buwenbuhuo","Happy 3"); controller.publish("buwenbuhuo","Happy 4"); controller.publish("buwenbuhuo","Happy 5");
// 查看weibo
hbase(main):002:0> scan 'weibo:weibo'
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- 3. 关注微博
// 3. 关注微博 controller.follow("buwen","buwenbuhuo"); controller.follow("buhuo","buwenbuhuo");
// 查看是否关注
hbase(main):004:0> scan 'weibo:relation'
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- 4. 获取微博内容
// 最新的消息(获取) List<String> allRecentWeibos = controller.getAllRecentWeibos("1002"); // 查看数据 for (String allRecentWeibo : allRecentWeibos) { System.out.println(allRecentWeibo); }
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- 5. 取关微博
controller.unFollow("1002","buwenbuhuo"); List<String> allRecentWeibos = controller.getAllRecentWeibos("1002"); // 查看数据 for (String allRecentWeibo : allRecentWeibos) { System.out.println(allRecentWeibo); }
hbase(main):014:0> scan 'weibo:relation'
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- 6. 获取所有人的微博
// 6. 获取某一个人的所有微博 List<String> allWeibosByUserID = controller.getAllWeibosByUserID("buwenbuhuo"); for (String s : allWeibosByUserID) { System.out.println(s); }
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本次的分享就到这里了,
好书不厌读百回，熟读课思子自知。而我想要成为全场最靓的仔，就必须坚持通过学习来获取更多知识，用知识改变命运，用博客见证成长，用行动证明我在努力。
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码字不易，大家的支持就是我坚持下去的动力。点赞后不要忘了关注我哦！
文章来源: buwenbuhuo.blog.csdn.net，作者：不温卜火，版权归原作者所有，如需转载，请联系作者。
原文链接：buwenbuhuo.blog.csdn.net/article/details/106105377
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