[原]Couchbase之环境搭建与Java小试
Couchbase Server 是一个集群化的、基于文档的数据库系统,网上有MongoDB与Couchbase的对比,请参考:
http://www.javaworld.com/javaworld/jw-03-2013/130321-mongodb-vs-couchbase-nosql.html
Couchbase主页: http://www.couchbase.com/
本文的目标是搭建简单的Couchbase环境并用Java语言进行读写测试。
1.准备工作
1)下载 Couchbase Server ,本文用到的版本是1.8.1 for win32 ,2.0在我的机器上装不上,内核问题。
2)下载 Java相关类库
2.安装Couchbase Server
1)安装详细过程请参考:http://www.couchbase.com/docs/couchbase-manual-2.0/couchbase-getting-started-install-win.html
2)安装完成后Couchbase Console程序会自动打开http://localhost:8091地址,这时候有可能会打不开,最有可能出现的问题就是端口被占用了。
Couchbase默认端口是:8091,运行如下命令排查:
netstat -ano|findstr "8091" TCP 127.0.0.1:9050 0.0.0.0:0 LISTENING 1751
端口被进程号为1751的进程占用,继续执行下面命令:
tasklist|findstr "1751" spool.exe 1751 Console 0 16,064 K
打开任务管理器根据进程ID结束掉相应程序。这时打开Couchbase安装目标下的server/bin目录,形如:D:\Program Files\Couchbase\Server\bin执行service_start.bat批处理命令后,在服务里检查CouchbaseServer服务是否启动。
这时再打开http://localhost:8091就能自动CouchServer 的webconsole安装页面了,参考:http://www.couchbase.com/docs/couchbase-manual-2.0/couchbase-getting-started-setup.html进行安装配置。
3.编写例子进行测试用eclipse或其它IDE新建Project,导入之前下载的Couchbase-Java-Client-1.1.4.zip中的所有jar包。
新建写入测试类:
import java.io.IOException; import java.net.URI; import java.util.LinkedList; import java.util.List; import java.util.concurrent.ExecutionException; import java.util.concurrent.TimeUnit; import net.spy.memcached.internal.OperationFuture; import com.couchbase.client.CouchbaseClient; public class Main { //文档key public static final String KEY = "beer_Wrath"; // expiration time of the document (use 0 to persist forever) //过期时间(单位毫秒 0 永久) public static final int EXP_TIME = 0; //文档值 public static final String VALUE = "{\"name\":\"Wrath\",\"abv\":9.0," + "\"type\":\"beer\",\"brewery_id\":\"110f1a10e7\"," + "\"updated\":\"2010-07-22 20:00:20\"," + "\"description\":\"WRATH Belgian-style \"," + "\"style\":\"Other Belgian-Style Ales\"," + "\"category\":\"Belgian and French Ale\"}"; public static void main(String args[]) { List<URI> uris = new LinkedList<URI>(); //服务器地址(可在Couchbase后台Server NODES中查看) uris.add(URI.create("http://192.168.10.15:8091/pools")); CouchbaseClient client = null; try { //在Couchbase后台的Data Buckets中查看 client = new CouchbaseClient(uris, "default", ""); } catch (IOException e) { System.err.println("IOException connecting to Couchbase: " + e.getMessage()); System.exit(1); } OperationFuture<Boolean> setOp = client.set(KEY, EXP_TIME, VALUE); //检查是否设置成功 try { if (setOp.get().booleanValue()) { System.out.println("Set Succeeded"); } else { System.err.println("Set failed: " + setOp.getStatus().getMessage()); } } catch (InterruptedException e) { System.err.println("InterruptedException while doing set: " + e.getMessage()); } catch (ExecutionException e) { System.err.println("ExecutionException while doing set: " + e.getMessage()); } System.out.println(); //完成操作后3秒后关闭client client.shutdown(3, TimeUnit.SECONDS); System.exit(0); } }
运行后看到Set Succeeded字样表示设置成功。编写测试类进行读取:
import java.io.IOException; import java.net.URI; import java.util.LinkedList; import java.util.List; import java.util.concurrent.TimeUnit; import com.couchbase.client.CouchbaseClient; public class Client { public static void main(String[] args) { List<URI> uris = new LinkedList<URI>(); uris.add(URI.create("http://192.168.10.15:8091/pools")); CouchbaseClient client = null; try { client = new CouchbaseClient(uris, "default", ""); } catch (IOException e) { System.err.println("IOException connecting to Couchbase: " + e.getMessage()); System.exit(1); } Object o = client.get("beer_Wrath"); System.out.println(o); client.shutdown(3, TimeUnit.SECONDS); System.exit(0); } }
由于写入例子中设置的时间是永久,所以这里正确的输出应该是:
{"name":"Wrath","abv":9.0,"type":"beer","brewery_id":"110f1a10e7","updated":"2010-07-22 20:00:20","description":"WRATH Belgian-style ","style":"Other Belgian-Style Ales","category":"Belgian and French Ale"}
我们还能在Couchbase webconsole后台的Data buckets中查看到我们刚才设置的key.