用Java实现向Cassandra数据库中插入和查询数据
所用jar包：
其中jxl.jar和dom4j.jar，jaxen-1.1-beta-6.jar是解析XML文件用的jar包，如果不解析XML文件可以不用。
代码如下：
package com.locationdataprocess;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import com.datastax.driver.core.BoundStatement;
import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.Host;
import com.datastax.driver.core.Metadata;
import com.datastax.driver.core.PreparedStatement;
import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.Row;
import com.datastax.driver.core.Session; public class QueryAndUpdateData { private Cluster cluster; private Session session; public Cluster getCluster() {
return cluster;
} public void setCluster(Cluster cluster) {
this.cluster = cluster;
} public Session getSession() {
return session;
} public void setSession(Session session) {
this.session = session;
} /**
* 连接节点
*
* @param node
*/
public void connect(String node) {
cluster = Cluster.builder().addContactPoint(node).build();
Metadata metadata = cluster.getMetadata();
System.out.printf("Connected to cluster: %s\n",
metadata.getClusterName());
for (Host host : metadata.getAllHosts()) {
System.out.printf("Datatacenter: %s; Host: %s; Rack: %s\n",
host.getDatacenter(), host.getAddress(), host.getRack());
} this.session = cluster.connect();
} public void insertData(String name) {
String fileName[]={"Zhengye_DriveTesting_08-18.09-07.txt","Zhengye_DriveTesting_08-18.09-13.txt",
"Zhengye_DriveTesting_08-18.17-40.txt","Zhengye_DriveTesting_08-18.17-48.txt",
"Zhengye_DriveTesting_08-19.17-19.txt","Zhengye_DriveTesting_08-20.09-33.txt",
"Zhengye_DriveTesting_08-20.18-05.txt","Zhengye_DriveTesting_08-19.09-08.txt",
"Zhengye_DriveTesting_08-21.18-07.txt","Zhengye_DriveTesting_08-21.09-34.txt"
};
int n = fileName.length;
String sqlGPS = "CREATE TABLE IF NOT EXISTS gpsdata.gps ("
+ "time varchar,"
+ "gps_time varchar,longitude varchar,"
+ "latitude varchar,altitude varchar,"
+ "heading varchar,speed varchar,"
+ "source varchar,satellites varchar,"
+ "PRIMARY KEY (time))";
String sqlTA = "CREATE TABLE IF NOT EXISTS gpsdata.ta ("
+"time varchar,"
+ "version varchar,"
+ "nRecords varchar,"
+ "nSubFrame varchar,"
+ "nSystemFrame varchar,"
+ "DLFrameTimingOffset varchar,"
+ "ULFrameTimingOffset varchar,"
+ "ULTimingAdvance varchar,"
+ "PRIMARY KEY (time))";
String sqlDB = "CREATE TABLE IF NOT EXISTS gpsdata.db ("
+"time varchar,"
+ "version varchar,"
+ "EARFCN varchar,"
+ "CellId varchar,"
+ "nSubFrame varchar,"
+ "RSRP varchar,"
+ "RSRQ varchar,"
+ "NeighborCells varchar,"
+ "DetectedCells varchar,"
+ "NeighborCellId varchar,"
+ "NeighborRSRP varchar,"
+ "NeighborRSRQ varchar,"
+ "PRIMARY KEY (time))";
String insertGPS = "insert into gpsdata.gps("
+ "time,gps_time,longitude,latitude,"
+ "altitude,heading,speed,"
+ "source,satellites)"
+ " values(?,?,?,?,?,?,?,?,?)";
String insertTA = "insert into gpsdata.ta("
+"time,version,nRecords,nSubFrame,nSystemFrame,DLFrameTimingOffset,"
+ "ULFrameTimingOffset,ULTimingAdvance)"
+ " values(?,?,?,?,?,?,?,?)";
String insertDB = "insert into gpsdata.db("
+"time,version,EARFCN,"
+ "CellId,nSubFrame,RSRP,"
+ "RSRQ,NeighborCells,DetectedCells,"
+ "NeighborCellId,NeighborRSRP,NeighborRSRQ)"
+ " values(?,?,?,?,?,?,?,?,?,?,?,?)";
String sql = null, insert=null;
if(name=="GPS"){
sql = sqlGPS;
insert = insertGPS;
}else if(name=="TA"){
sql = sqlTA;
insert = insertTA;
}else if(name=="DB"){
sql = sqlDB;
insert = insertDB;
}
getSession().execute(sql); PreparedStatement psta = getSession().prepare(insert);
BoundStatement boundSta = new BoundStatement(psta);
for(int k=0;k<n;k++){
File file = new File("H:\\项目数据\\Zhengye_Drive_Testing_Data\\"
+ fileName[k]);
try {
FileInputStream fis = new FileInputStream(file);
InputStreamReader isr = new InputStreamReader(fis);
BufferedReader br = new BufferedReader(isr);
String line = null;
if (name == "GPS") {
while ((line = br.readLine()) != null) {
String s = line.trim();
if (s.contains("3D GPS Info")) {
String data[] = new String[9];
data[0] = s.substring(0, 25);
int i = 0;
while (i < 1 && (line = br.readLine()) != null) {
if (!line.equals("")) {
data[1] = line.split("=")[1].trim();
// System.out.println(line.trim());
i++;
}
}
// System.out.println(s);
i = 0;
while (i < 7 && (line = br.readLine()) != null) {
if (!line.equals("")) {
data[i + 2] = line.split("=")[1].trim();
// System.out.println(line.trim());
i++;
}
}
getSession().execute(
boundSta.bind(data[0], data[1], data[2],
data[3], data[4], data[5], data[6],
data[7], data[8]));
}
}
} else if (name == "TA") {
while ((line = br.readLine()) != null) {
String s = line.trim();
if (s.contains("LTE LL1 Serving Cell Frame Timing")) {
String data[] = new String[8];
data[0] = s.substring(0, 25);
// System.out.println(s);
int i = 0;
while (i < 7 && (line = br.readLine()) != null) {
if (!line.equals("")) {
data[i + 1] = line.split("=")[1].trim();
// System.out.println(line.trim());
i++;
}
}
getSession().execute(
boundSta.bind(data[0], data[1], data[2],
data[3], data[4], data[5], data[6],
data[7]));
}
}
} else if(name=="DB"){
while ((line = br.readLine()) != null) {
String s = line.trim();
if (s.contains("LTE ML1 Connected Mode LTE Intra-Freq Meas Results")) {
String data[] = new String[12];
data[9] = "";
data[10] = "";
data[11] = "";
data[0] = s.substring(0, 25);
// System.out.println(s);
int i = 0;
while (i < 8 && (line = br.readLine()) != null) {
if (!line.equals("")) {
data[i + 1] = line.split("=")[1].trim();
// System.out.println(line.trim());
i++;
}
}
int i1 = 0;
while (i1 < 6 && (line = br.readLine()) != null) {
i1++;
}
;
while ((line = br.readLine()) != null
&& line.contains("|")) {
// System.out.println(line);
data[i + 1] += line.split("\\|")[2].trim()
+ " ";
data[i + 2] += line.split("\\|")[3].trim()
+ " ";
data[i + 3] += line.split("\\|")[4].trim()
+ " ";
}
// System.out.println(data[9]);
getSession().execute(
boundSta.bind(data[0], data[1], data[2],
data[3], data[4], data[5], data[6],
data[7], data[8], data[9],
data[10], data[11]));
}
}
} System.out.println(fileName[k]+"插入成功！");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} } //查询TA数据
public void loadTAData() {
String select = "select* from gpsdata.ta";
ResultSet resultSet = getSession().execute(select);
int count=0;
for (Row row : resultSet) {
System.out.println("time: "+row.getString("time"));
System.out.println("version: "+row.getString("version"));
System.out.println("nRecords: "+row.getString("nrecords"));
System.out.println("nSubFrame: "+row.getString("nsubframe"));
System.out.println("nSystemFrame: "+row.getString("nsystemframe"));
System.out.println("DLFrameTimingOffset: "+row.getString("dlframetimingoffset"));
System.out.println("ULFrameTimingOffset: "+row.getString("ulframetimingoffset"));
System.out.println("ULTimingAdvance: "+row.getString("ultimingadvance"));
System.out.println("=========================================================");
count++;
}
System.out.println("行数:"+count);
} //查询DB数据
public void loadDBData() {
String select = "select* from gpsdata.db";
ResultSet resultSet = getSession().execute(select);
int count=0;
for (Row row : resultSet) {
System.out.println("time: "+row.getString("time"));
System.out.println("version: "+row.getString("version"));
System.out.println("EARFCN: "+row.getString("earfcn"));
System.out.println("CellId: "+row.getString("cellid"));
System.out.println("nSubFrame: "+row.getString("nsubframe"));
System.out.println("RSRP: "+row.getString("rsrp"));
System.out.println("RSRQ: "+row.getString("rsrq"));
System.out.println("NeighborCells: "+row.getString("neighborcells"));
System.out.println("DetectedCells: "+row.getString("detectedcells"));
System.out.println("NeighborCellId: "+row.getString("neighborcellid"));
System.out.println("NeighborRSRP: "+row.getString("neighborrsrp"));
System.out.println("NeighborRSRQ: "+row.getString("neighborrsrq"));
System.out.println("=========================================================");
count++;
}
System.out.println("行数:"+count);
} //查询GPS数据
public void loadGPSData() {
String select = "select* from gpsdata.gps";
ResultSet resultSet = getSession().execute(select);
int count=0;
for (Row row : resultSet) {
System.out.println("time: "+row.getString("time"));
System.out.println("gps_time: "+row.getString("gps_time"));
System.out.println("longitude: "+row.getString("longitude"));
System.out.println("latitude: "+row.getString("latitude"));
System.out.println("altitude: "+row.getString("altitude"));
System.out.println("heading: "+row.getString("heading"));
System.out.println("speed: "+row.getString("speed"));
System.out.println("source: "+row.getString("source"));
System.out.println("satellites: "+row.getString("satellites"));
System.out.println("=========================================================");
count++;
}
System.out.println("行数:"+count);
} public void close() {
cluster.close();
System.out.println("程序正常关闭！");
} public static void main(String[] args) {
QueryAndUpdateData client = new QueryAndUpdateData();
client.connect("127.0.0.1");
// client.insertData("DB");
// client.loadTAData();
client.loadDBData();
// client.loadGPSData();
client.session.close();
client.close();
}
}
参考链接：
Cassandra 2.x中文教程（22）：使用Java驱动操作Cassandra
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