about 9 years ago
如果你也安裝完這兩篇完全分佈式安裝Hadoop、完全分佈式安裝Zookeeper與HBase
那接下來可以開發HBase的應用程式了
0 準備軟體&環境
Eclipse Java EE IDE for Web Developers. Version: Kepler Release 下載去
hbase-0.96.1.1-hadoop2-bin.tar.gz 下載去
1 設定Eclipse
通常我的第一個習慣是修改預設所有檔案編碼
打開eclipse.ini並在檔案內新增一行
-Dfile.encoding=UTF-8
因為Eclipse預設是採用系統編碼來寫入檔案(以前好像是CP950現在新版已變成Big5)
這樣不管你是要寫java、jsp、xml等...所有檔案均是用UTF-8來編寫
一來是匯入別人原始檔比較不容易有亂碼
二來是開發web時比較不會被編碼搞死
再來我會為每一個專案設立專屬的工作資料夾
將eclipse.exe建立一個捷徑，並開啟捷徑的內容
在目標的地方增加參數(記得先加空格再加參數)
-data D:\workspace\HBase_Client
像是這樣
2 解開hbase-0.96.1.1-hadoop2-bin.tar.gz
就用RAR之類的軟體解開就可以了
3 專案設定
開啟eclipse捷徑後建立一個java專案
專案資料夾下新增一格libs資料夾放jar檔用
需匯入的Jar檔，這邊是我執行程式時缺什麼才抓什麼進來，理論上是最小安裝版本了，jar檔全部都可以在hbase-0.96.1.1-hadoop2-bin.tar.gz裡面lib資料夾找的到
commons-codec-1.7.jar
commons-configuration-1.6.jar
commons-lang-2.6.jar
commons-logging-1.1.1.jar
guava-12.0.1.jar
hadoop-auth-2.2.0.jar
hadoop-common-2.2.0.jar
hbase-client-0.96.1.1-hadoop2.jar
hbase-common-0.96.1.1-hadoop2.jar
hbase-protocol-0.96.1.1-hadoop2.jar
htrace-core-2.01.jar
jackson-core-asl-1.8.8.jar
jackson-mapper-asl-1.8.8.jar
log4j-1.2.17.jar
netty-3.6.6.Final.jar
protobuf-java-2.5.0.jar
slf4j-api-1.6.4.jar
slf4j-log4j12-1.6.4.jar
zookeeper-3.4.5.jar
開啟專案的Properties選Java Build Path選項再選Libraries頁籤的Add JARs按鈕
選擇所有Jar檔
新增程式
package com.hbase.test;
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.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.MasterNotRunningException;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HTable;
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.util.Bytes;
public class HBaseTest {
private static Configuration conf = null;
/**
* 初始化配置
*/
static {
conf = HBaseConfiguration.create();
//如果沒有配置文件，一定要記得手動宣告
conf.set("hbase.zookeeper.quorum", "master");
}
/**
* 建立表格
* @param tablename
* @param cfs
*/
public static void createTable(String tablename, String[] cfs){
try {
HBaseAdmin admin = new HBaseAdmin(conf);
if (admin.tableExists(tablename)) {
System.out.println("table already exists!");
} else {
HTableDescriptor tableDesc = new HTableDescriptor(TableName.valueOf(tablename));
for (int i = 0; i < cfs.length; i++) {
tableDesc.addFamily(new HColumnDescriptor(cfs[i]));
}
admin.createTable(tableDesc);
admin.close();
System.out.println("create table " + tablename + " ok.");
}
} catch (MasterNotRunningException e) {
e.printStackTrace();
} catch (ZooKeeperConnectionException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 刪除表格
* @param tablename
*/
public static void deleteTable(String tablename){
try {
HBaseAdmin admin = new HBaseAdmin(conf);
admin.disableTable(tablename);
admin.deleteTable(tablename);
System.out.println("delete table " + tablename + " ok.");
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 新增一筆資料
* @param tableName
* @param rowKey
* @param family
* @param qualifier
* @param value
*/
public static void addRecord (String tableName, String rowKey, String family, String qualifier, String value){
try {
HTable table = new HTable(conf, tableName);
Put put = new Put(Bytes.toBytes(rowKey));
put.add(Bytes.toBytes(family),Bytes.toBytes(qualifier),Bytes.toBytes(value));
table.put(put);
System.out.println("insert recored " + rowKey + " to table " + tableName +" ok.");
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 刪除一筆資料
* @param tableName
* @param rowKey
*/
public static void delRecord (String tableName, String rowKey){
try {
HTable table = new HTable(conf, tableName);
List list = new ArrayList();
Delete del = new Delete(rowKey.getBytes());
list.add(del);
table.delete(list);
System.out.println("del recored " + rowKey + " ok.");
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 取得一筆資料
* @param tableName
* @param rowKey
*/
public static void getOneRecord (String tableName, String rowKey){
try {
HTable table = new HTable(conf, tableName);
Get get = new Get(rowKey.getBytes());
Result rs = table.get(get);
for(KeyValue kv : rs.raw()){
System.out.print(new String(kv.getRow()) + " " );
System.out.print(new String(kv.getFamily()) + ":" );
System.out.print(new String(kv.getQualifier()) + " " );
System.out.print(kv.getTimestamp() + " " );
System.out.println(new String(kv.getValue()));
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 取得所有資料
* @param tableName
*/
public static void getAllRecord (String tableName) {
try{
HTable table = new HTable(conf, tableName);
Scan s = new Scan();
ResultScanner ss = table.getScanner(s);
for(Result r:ss){
for(KeyValue kv : r.raw()){
System.out.print(new String(kv.getRow()) + " ");
System.out.print(new String(kv.getFamily()) + ":");
System.out.print(new String(kv.getQualifier()) + " ");
System.out.print(kv.getTimestamp() + " ");
System.out.println(new String(kv.getValue()));
}
}
} catch (IOException e){
e.printStackTrace();
}
}
public static void main(String[] args) {
try {
String tablename = "scores";
String[] familys = {"grade", "course"};
HBaseTest.createTable(tablename, familys);
//add record zkb
HBaseTest.addRecord(tablename,"zkb","grade","","5");
HBaseTest.addRecord(tablename,"zkb","course","","90");
HBaseTest.addRecord(tablename,"zkb","course","math","97");
HBaseTest.addRecord(tablename,"zkb","course","art","87");
//add record baoniu
HBaseTest.addRecord(tablename,"baoniu","grade","","4");
HBaseTest.addRecord(tablename,"baoniu","course","math","89");
System.out.println("===========get one record========");
HBaseTest.getOneRecord(tablename, "zkb");
System.out.println("===========show all record========");
HBaseTest.getAllRecord(tablename);
System.out.println("===========del one record========");
HBaseTest.delRecord(tablename, "baoniu");
HBaseTest.getAllRecord(tablename);
System.out.println("===========show all record========");
HBaseTest.getAllRecord(tablename);
} catch (Exception e) {
e.printStackTrace();
}
}
}
比較重要的是要設定hbase.zookeeper.quorum跟程式說Zookeeper在哪
執行結果
ps.log4的警告目前沒有關係，因為我沒有設定啦XD.....等正式開發的時候就會設好了
驗證HBase確實寫入資料
補充
如果不想用程式宣告Zookeeper的位置也可用xml檔，配置方式如下圖
因為KeyValue元件很多方法都被Deprecated，所以我找了一下似乎改以Cell操作所以就改了一下
package com.hbase.test;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.MasterNotRunningException;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HTable;
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.util.Bytes;
public class HBaseTest {
private static Configuration conf = null;
/**
* 初始化配置
*/
static {
conf = HBaseConfiguration.create();
//如果沒有配置文件，一定要記得手動宣告
//conf.set("hbase.zookeeper.quorum", "master");
}
/**
* 建立表格
* @param tablename
* @param cfs
*/
public static void createTable(String tablename, String[] cfs){
try {
HBaseAdmin admin = new HBaseAdmin(conf);
if (admin.tableExists(tablename)) {
System.out.println("table already exists!");
} else {
HTableDescriptor tableDesc = new HTableDescriptor(TableName.valueOf(tablename));
for (int i = 0; i < cfs.length; i++) {
tableDesc.addFamily(new HColumnDescriptor(cfs[i]));
}
admin.createTable(tableDesc);
admin.close();
System.out.println("create table " + tablename + " ok.");
}
} catch (MasterNotRunningException e) {
e.printStackTrace();
} catch (ZooKeeperConnectionException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 刪除表格
* @param tablename
*/
public static void deleteTable(String tablename){
try {
HBaseAdmin admin = new HBaseAdmin(conf);
admin.disableTable(tablename);
admin.deleteTable(tablename);
System.out.println("delete table " + tablename + " ok.");
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 新增一筆資料
* @param tableName
* @param rowKey
* @param family
* @param qualifier
* @param value
*/
public static void addRecord (String tableName, String rowKey, String family, String qualifier, String value){
try {
HTable table = new HTable(conf, tableName);
Put put = new Put(Bytes.toBytes(rowKey));
put.add(Bytes.toBytes(family),Bytes.toBytes(qualifier),Bytes.toBytes(value));
table.put(put);
System.out.println("insert recored " + rowKey + " to table " + tableName +" ok.");
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 刪除一筆資料
* @param tableName
* @param rowKey
*/
public static void delRecord (String tableName, String rowKey){
try {
HTable table = new HTable(conf, tableName);
List list = new ArrayList();
Delete del = new Delete(rowKey.getBytes());
list.add(del);
table.delete(list);
System.out.println("del recored " + rowKey + " ok.");
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 取得一筆資料
* @param tableName
* @param rowKey
*/
public static void getOneRecord (String tableName, String rowKey){
try {
HTable table = new HTable(conf, tableName);
Get get = new Get(rowKey.getBytes());
Result rs = table.get(get);
List<Cell> list = rs.listCells();
for(Cell cell:list){
System.out.print(new String(cell.getRowArray(),cell.getRowOffset(),cell.getRowLength()) + " " );
System.out.print(new String(cell.getFamilyArray(),cell.getFamilyOffset(),cell.getFamilyLength()) + ":" );
System.out.print(new String(cell.getQualifierArray(),cell.getQualifierOffset(),cell.getQualifierLength()) + " " );
System.out.print(cell.getTimestamp() + " " );
System.out.print(new String(cell.getValueArray(),cell.getValueOffset(),cell.getValueLength()) + " " );
System.out.println("");
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 取得所有資料
* @param tableName
*/
public static void getAllRecord (String tableName) {
try{
HTable table = new HTable(conf, tableName);
Scan scan = new Scan();
ResultScanner resultscanner = table.getScanner(scan);
for(Result rs:resultscanner){
List<Cell> list = rs.listCells();
for(Cell cell:list){
System.out.print(new String(cell.getRowArray(),cell.getRowOffset(),cell.getRowLength()) + " " );
System.out.print(new String(cell.getFamilyArray(),cell.getFamilyOffset(),cell.getFamilyLength()) + ":" );
System.out.print(new String(cell.getQualifierArray(),cell.getQualifierOffset(),cell.getQualifierLength()) + " " );
System.out.print(cell.getTimestamp() + " " );
System.out.print(new String(cell.getValueArray(),cell.getValueOffset(),cell.getValueLength()) + " " );
System.out.println("");
}
}
} catch (IOException e){
e.printStackTrace();
}
}
/**
* 取得Family清單
* @param tableName
* @return
*/
public static ArrayList getAllFamilyName(String tableName) {
ArrayList<String> familyname_list = new ArrayList();
try{
HTable table = new HTable(conf, tableName);
HTableDescriptor htabledescriptor = table.getTableDescriptor();
HColumnDescriptor[] hdlist = htabledescriptor.getColumnFamilies();
for(int i=0;i<hdlist.length;i++){
HColumnDescriptor hd = hdlist[i];
familyname_list.add(hd.getNameAsString());
}
} catch (IOException e){
e.printStackTrace();
}
return familyname_list;
}
public static void main(String[] args) {
try {
String tablename = "scores";
String[] familys = {"grade", "course"};
HBaseTest.createTable(tablename, familys);
//add record zkb
HBaseTest.addRecord(tablename,"zkb","grade","","5");
HBaseTest.addRecord(tablename,"zkb","course","","90");
HBaseTest.addRecord(tablename,"zkb","course","math","97");
HBaseTest.addRecord(tablename,"zkb","course","art","87");
//add record baoniu
HBaseTest.addRecord(tablename,"baoniu","grade","","4");
HBaseTest.addRecord(tablename,"baoniu","course","math","89");
System.out.println("===========get one record========");
HBaseTest.getOneRecord(tablename, "baoniu");
System.out.println("===========show all record========");
HBaseTest.getAllRecord(tablename);
System.out.println("===========del one record========");
HBaseTest.delRecord(tablename, "baoniu");
HBaseTest.getAllRecord(tablename);
System.out.println("===========show all record========");
HBaseTest.getAllRecord(tablename);
System.out.println("===========show all familyname========");
System.out.println(HBaseTest.getAllFamilyName(tablename));
} catch (Exception e) {
e.printStackTrace();
}
}
}
參考來源
http://blog.csdn.net/chen_zhipeng/article/details/7887109
