第五章 MyEclipse配置hadoop开发环境

1.首先要下载相应的hadoop版本的插件，我这里就给2个例子：

hadoop-1.2.1插件：http://download.csdn.net/download/hanyongan300/6238153

hadoop2.2.0插件：/article/1582830.html

上一章我也讲了怎么制作相应版本的插件，这些插件可以在网上搜到

2.把插件拷贝到myeclipse根目录下/dropins目录下。

3、 启动myeclipse，打开Perspective：

【Window】->【Open Perspective】->【Other...】->【Map/Reduce】->【OK】





3、 打开一个View：

【Window】->【Show View】->【Other...】->【MapReduce Tools】->【Map/Reduce Locations】->【OK】





4、 添加Hadoop location：







location name: 我填写的是：hadoop，这个可以任意填写

Map/Reduce Master 这个框里：

这两个参数就是mapred-site.xml里面mapred.job.tracker里面的ip和port

Host：就是jobtracker 所在的集群机器，这里写192.168.0.155，我这个myeclipse是在windows下的，所以去连接liunx下的hadoop要写地址
Hort：就是jobtracker 的port，这里写的是9001

DFS Master 这个框里

这两个参数就是core-site.xml里面fs.default.name里面的ip和port
Host：就是namenode所在的集群机器，这里写192.168.0.155
Port：就是namenode的port，这里写9000

（Use M/R master host，这个复选框如果选上，就默认和Map/Reduce Master这个框里的host一样，如果不选择，就可以自己定义输入，这里jobtracker 和namenode在一个机器上，所以是一样的，就勾选上）

user name：这个是连接hadoop的用户名，我创建的用户就是hadoop。

然后继续填写advanced parameters

在这里只需要填写 hadoop.tmp.dir这一栏，跟在core-site.xml里面配置写的一样



然后关闭myeclipse重启，就可以看到连接成功了。。。





连接DFS，是为了帮助你查看hdfs目录的，在这里，你可以直接操作hdfs.点击右键：



create new directory:创建文件

Refresh:刷新

upload files to DFS:上传文本

upload directory to DFS:上传文件夹

如果要是创建hadoop项目，先配置下：Window------preferences----Hadoop Map/Reduce,指定本地的hadoop



然后在本地配置远程hadoop的IP，打开C:\Windows\System32\drivers\etc\hosts文件，添加hadoop所安装的服务器IP和主机名



下面就可以在myeclipse创建mapreduce项目了，file----new Prokect-----



下面就正常写代码：下面是操作hase的代码

package hbase;

import java.io.File;
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.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.filter.CompareFilter.CompareOp;
import org.apache.hadoop.hbase.filter.SingleColumnValueFilter;
import org.apache.hadoop.hbase.util.Bytes;

/**
* 对hbase进行增删改查
* @author Administrator
*
*/
public class HbaseTest {
private static Configuration conf=null;
static{
conf=HBaseConfiguration.create();
conf.set("hbase.zookeeper.property.clientPort", "2181");
conf.set("hbase.zookeeper.quorum", "192.168.0.26");
//configuration.set("hbase.master", "192.168.1.25:6000");
File workaround = new File(".");
System.getProperties().put("hadoop.home.dir",
workaround.getAbsolutePath());
new File("./bin").mkdirs();
try {
new File("./bin/winutils.exe").createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 创建一张表
* @param tablename
* @param cfg
* @throws IOException
*/

public static void createTable(String tablename,String[] cfg)
throws IOException{
HBaseAdmin admin=new HBaseAdmin(conf);
if(admin.tableExists(tablename)){
System.out.println("表已经存在！");
}else{
HTableDescriptor tableDesc=new HTableDescriptor(tablename);
for(int i=0;i<cfg.length;i++){
tableDesc.addFamily(new HColumnDescriptor(cfg[i]));
}
admin.createTable(tableDesc);
System.out.println("表创建成功！");
}
}
/**
* 删除表
* @param tablename
* @throws IOException

*/
public static void deleteTable(String tablename)
throws IOException{
HBaseAdmin admin=new HBaseAdmin(conf);
admin.disableTable(tablename);
admin.deleteTable(tablename);
System.out.println("表删除成功");
}
/**
* 插入一行记录
* @param tablename
* @param rowkey
* @param family
* @param qualifier
* @param value
*/
public static void writeRow(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("插入数据成功");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}
/**
* 查找开始与结束之间的数据
* @param tableName
*/
public static void getAll(String tableName) {
try{
HTable table = new HTable(conf, tableName);
Scan scan = new Scan(Bytes.toBytes("a"), Bytes.toBytes("z"));
//             scan.addColumn(Bytes.toBytes("a"), Bytes.toBytes("z"));
//             SingleColumnValueFilter filter = new SingleColumnValueFilter(Bytes.toBytes("a"),
//                     Bytes.toBytes("z"),
//                     CompareOp.NOT_EQUAL, Bytes.toBytes("0"));
//             filter.setFilterIfMissing(true);
//             scan.setFilter(filter);

ResultScanner ss = table.getScanner(scan);
for(Result r:ss){
for(KeyValue kv : r.raw()){
System.out.print("rowid为："+new String(kv.getRow()) + " ");
System.out.print("列族为："+new String(kv.getFamily()) + " ");
System.out.print("列限定符为："+new String(kv.getQualifier()) + " ");
System.out.print("时间戳"+kv.getTimestamp() + " ");
System.out.println("值为"+new String(kv.getValue()));
}
}
} catch (IOException e){
e.printStackTrace();

}
}
/**
* 查找一行记录
* @param tablename
* @param rowKey
* @throws IOException
*/
@SuppressWarnings("deprecation")
public static void getOne(String tablename,String rowKey) throws IOException{
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()));
}

}
/**
* 显示所有数据
*/
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("rowid为："+new String(kv.getRow()) + " ");
System.out.print("列族为："+new String(kv.getFamily()) + " ");
System.out.print("列限定符为："+new String(kv.getQualifier()) + " ");
System.out.print("时间戳"+kv.getTimestamp() + " ");
System.out.println("值为"+new String(kv.getValue()));
}
}
} catch (IOException e){
e.printStackTrace();

}
}
/**
* 删除一行记录
*/
public static void delRecord (String tableName, String rowKey) throws IOException{
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.");
}

public static void main(String[] agrs){
String tablename="score";
String[] familys={"grade","course"};
try {
HbaseTest.createTable(tablename, familys);
//HbaseTest.delvalue(tablename, "zkb","course" , "click", "90");
//                        HbaseTest.delRecord(tablename, "zkb");

} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

//            HbaseTest.writeRow(tablename, "zkb", "grade", "title", "5");
//            HbaseTest.writeRow(tablename, "zkb", "course", "click", "90");
//            HbaseTest.writeRow(tablename, "zkb", "course", "url", "97");
//            HbaseTest.writeRow(tablename, "zkb", "course", "author", "87");
//
//            HbaseTest.writeRow(tablename, "baoniu", "grade", "reply", "4");
//            HbaseTest.writeRow(tablename, "baoniu", "course", "siteName", "89");
//            HbaseTest.writeRow(tablename, "1", "grade", "title", "5");
//            HbaseTest.writeRow(tablename, "1", "course", "click", "90");
//            HbaseTest.writeRow(tablename, "2", "course", "url", "97");
//            HbaseTest.writeRow(tablename, "2", "course", "author", "87");
//
//            HbaseTest.writeRow(tablename, "3", "grade", "reply", "4");
//            HbaseTest.writeRow(tablename, "3", "course", "siteName", "89");
//            HbaseTest.getOne(tablename, "zkb");
//            HbaseTest.getAllRecord(tablename);

//        HbaseTest.getAllRecord(tablename);
HbaseTest.getAll(tablename);

}

}