1.创建maven war 项目
2.pom配置文件如下
4.0.0
com.mulhyac
learn-hbase
1.0.0
war
cloudera
https://repository.cloudera.com/artifactory/cloudera-repos/
org.apache.hbase
hbase-client
1.2.0-cdh5.13.0
org.apache.hadoop
hadoop-core
2.6.0-mr1-cdh5.13.0
org.apache.logging.log4j
log4j-core
2.6.2
javax.servlet
javax.servlet-api
4.0.0-b01
3.web.xml配置
web.xml
qyq3
HBaseServlet
com.mulhyac.learn.hbase.servlet.HBaseServlet
HBaseServlet
/HBaseServlet
4.servlet代码
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.client.*;
import org.apache.hadoop.hbase.util.Bytes;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
/**
* Created by Administrator on 2016-11-22.
*/
public class HBaseServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA");
String tableName = "test";
String columnFamily = "cf";
try {
if (true == HBaseServlet.delete(tableName)) {
System.out.println("Delete Table " + tableName + " success!");
}
System.out.println("************start create table**********");
HBaseServlet.create(tableName, columnFamily);
HBaseServlet.put(tableName, "row1", columnFamily, "column1",
"data1");
HBaseServlet.put(tableName, "row2", columnFamily, "column2",
"data2");
HBaseServlet.put(tableName, "row3", columnFamily, "column3",
"data3");
HBaseServlet.put(tableName, "row4", columnFamily, "column4",
"data4");
HBaseServlet.put(tableName, "row5", columnFamily, "column5",
"data5");
HBaseServlet.get(tableName, "row1");
HBaseServlet.scan(tableName);
} catch (Exception e) {
e.printStackTrace();
}
response.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("hello world");
out.flush();
out.close();
}
static Configuration cfg;
static {
cfg = HBaseConfiguration.create();
System.out.println(cfg.get("hbase.master"));
}
public static void create(String tableName, String columnFamily)
throws Exception {
HBaseAdmin admin = new HBaseAdmin(cfg);
if (admin.tableExists(tableName)) {
System.out.println(tableName + " exists!");
} else {
HTableDescriptor tableDesc = new HTableDescriptor(tableName);
tableDesc.addFamily(new HColumnDescriptor(columnFamily));
admin.createTable(tableDesc);
System.out.println(tableName + " create successfully!");
}
}
public static void put(String tablename, String row, String columnFamily,
String column, String data) throws Exception {
HTable table = new HTable(cfg, tablename);
Put put = new Put(Bytes.toBytes(row));
put.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column),
Bytes.toBytes(data));
table.put(put);
System.out.println("put '" + row + "', '" + columnFamily + ":" + column
+ "', '" + data + "'");
}
public static void get(String tablename, String row) throws Exception {
HTable table = new HTable(cfg, tablename);
Get get = new Get(Bytes.toBytes(row));
Result result = table.get(get);
System.out.println("Get: " + result);
}
public static void scan(String tableName) throws Exception {
HTable table = new HTable(cfg, tableName);
Scan s = new Scan();
ResultScanner rs = table.getScanner(s);
for (Result r : rs) {
System.out.println("Scan: " + r);
}
}
public static boolean delete(String tableName) throws IOException {
HBaseAdmin admin = new HBaseAdmin(cfg);
if (admin.tableExists(tableName)) {
try {
admin.disableTable(tableName);
admin.deleteTable(tableName);
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
return true;
}
}