1、引入jar
<dependency>
<groupId>com.dangdang</groupId>
<artifactId>elastic-job-lite-core</artifactId>
<version>2.1.5</version>
</dependency>2、任务逻辑
public class ArchivieJob implements SimpleJob {
@Override
public void execute(ShardingContext shardingContext) {
//1、从原表中查询出1条记录（未归档）
String selectSql = "select * from resume where state = '未归档' limit 1";
List<Map<String, Object>> list = JDBCUtil.executeQuery(selectSql);
if(list == null && list.size() == 0){
System.out.println("数据已经处理完毕！！！");
return;
}
//2、从未归档改为已归档
Map<String,Object> stringObjectMap = list.get(0);
long id = (long) stringObjectMap.get("id");
String name = (String) stringObjectMap.get("name");
String education = (String) stringObjectMap.get("education");
System.out.println("==========>" + id + " name：" + name + " education：" + education);
String updateSql = "update resume set state = '已归档' where id = ?";
JDBCUtil.executeUpdate(updateSql,id);
String insertSql = "insert into resume_bak select * from resume where id = ?";
JDBCUtil.executeUpdate(insertSql,id);
}
}public class JDBCUtil {
private static String driver = "com.mysql.jdbc.Driver";
private static String url = "jdbc:mysql://101.132.167.18:3306/mydatabase";
private static String username = "root";
private static String password = "root";
static {
try {
Class.forName(driver);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
public static List<Map<String,Object>> executeQuery(String sql, Object ...arg){
Connection con = getConnection();
ResultSet rs = null;
PreparedStatement ps = null;
try{
ps = con.prepareStatement(sql);
for (int i = 0; i < arg.length; i++) {
ps.setObject(i+1,arg[i]);
}
rs = ps.executeQuery();
//定义一个空集合存储数据
List<Map<String,Object>> list = new ArrayList<>();
//获取结果集的个数
int count = rs.getMetaData().getColumnCount();
//对结果集遍历每一条数据是一个Mapj集合，列是k，值是v
while(rs.next()){
//一个空的map集合，用来存放每条数据
Map<String,Object> map = new HashMap<>();
for (int i = 0; i < count; i++) {
Object obj = rs.getObject(i+1);
String key = rs.getMetaData().getColumnName(i+1);
map.put(key,obj);
}
list.add(map);
}
} catch (SQLException throwables) {
throwables.printStackTrace();
}finally {
close(rs,ps,con);
}
return null;
}
public static void executeUpdate(String sql,Object ...arg){
Connection con = getConnection();
PreparedStatement ps = null;
try {
ps = con.prepareStatement(sql);
for (int i = 0; i < arg.length; i++) {
ps.setObject(i+1,arg[i]);
}
ps.executeUpdate();
} catch (SQLException throwables) {
throwables.printStackTrace();
}finally {
close(null,ps,con);
}
}
public static Connection getConnection() {
try {
return DriverManager.getConnection(url, username, password);
} catch (SQLException throwables) {
throwables.printStackTrace();
}
return null;
}
public static void close(ResultSet rs, PreparedStatement ps, Connection con){
if(rs != null){
try {
rs.close();
} catch (SQLException throwables) {
throwables.printStackTrace();
}finally {
if(ps != null){
try {
ps.close();
} catch (SQLException throwables) {
throwables.printStackTrace();
}finally {
try {
con.close();
} catch (SQLException throwables) {
throwables.printStackTrace();
}
}
}
}
}
}
}建表，初始化数据
create table resume(id long,name varchar(10),education varchar(10),state varchar(10));
insert into resume values(1,'张三','博士','未归档');
insert into resume values(2,'张二','博士','未归档');
insert into resume values(3,'李四','硕士','未归档');
insert into resume values(4,'李六','硕士','未归档');
insert into resume values(5,'王六','硕士','未归档');
insert into resume values(6,'王无','硕士','未归档');
insert into resume values(7,'赵六','本科','未归档');
insert into resume values(8,'赵八','本科','未归档');
insert into resume values(9,'小刚','本科','未归档');
insert into resume values(10,'小亮','本科','未归档');
insert into resume values(11,'小明','本科','未归档');
insert into resume values(12,'小花','专科','未归档');
insert into resume values(13,'龙龙','专科','未归档');
insert into resume values(14,'蓓蓓','博科','未归档');
insert into resume values(15,'阿珍','博科','未归档');
insert into resume values(16,'阿强','博士、','未归档');
insert into resume values(17,'杰克','博士、','未归档');
insert into resume values(18,'汤姆','博士、','未归档');
insert into resume values(19,'山姆','博士、','未归档');
insert into resume values(20,'山羊','博士、','未归档');
3、执行器
public class ElasticJobMain {
public static void main(String[] args) {
//配置分布式协调服务中心（zookeeper）
ZookeeperConfiguration zookeeperConfiguration = new ZookeeperConfiguration("101.132.167.18:2181","data-archive-job");
CoordinatorRegistryCenter coordinatorRegistryCenter = new ZookeeperRegistryCenter(zookeeperConfiguration);
coordinatorRegistryCenter.init();
//配置任务（时间事件、定时任务业务逻辑、调度器）
JobCoreConfiguration jobCoreConfiguration = JobCoreConfiguration.newBuilder("archive-job","*/2 * * * * ?",1).build();
SimpleJobConfiguration simpleJobConfiguration = new SimpleJobConfiguration(jobCoreConfiguration,ArchivieJob.class.getName());
//创建LiteJobConfiguration
LiteJobConfiguration liteJobConfiguration = LiteJobConfiguration.newBuilder(simpleJobConfiguration).overwrite(true).build();
new JobScheduler(coordinatorRegistryCenter,liteJobConfiguration).init();
}
}备注：可以使用 zooinspector 工具查看 zookeeper ，解压 zooinspector 安装包，执行
java -jar zookeeper-dev-ZooInspector.jar