我有执行Url扫描的方法，我需要在加载所有弹簧配置后在背景中启动它。我尝试使用InitializingBean，但是进程不在后台进行循环，配置永远不会结束。请给我任何关于这个问题的宣传。谢谢。
public class ScheduledScanner implements InitializingBean {
protected static Logger logger = Logger.getLogger(ScheduledScanner.class);
protected final static String USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:19.0) Gecko/20100101 Firefox/19.0";
private static final int MYTHREADS = 30;
private Date date = new Date();
private Timestamp timestamp = new Timestamp(date.getTime());
private AdminService adminService;
private EmployeeService employeeService;
private ConfigurableApplicationContext context =
new ClassPathXmlApplicationContext(new String[]{"classpath:application-context.xml"});
@Autowired
public void setAdminService(AdminService adminService) {
this.adminService = adminService;
}
@Autowired
public void setEmployeeService(EmployeeService employeeService) {
this.employeeService = employeeService;
}
/**
* Sends GET request to @param ip: @param port with Apache HttpClient
* <p/>
* param ip - must contain URL or IP of target server;
* param port - for server target Port;
* param timeout - sets the time for request timeout before no respond;
* <p/>
* ServerState enum:
* OK - server is up and responding correctly
* WARN - server is running, but returns a response to the HTTP - code different than 200
* FAIL - the server is not responding, or responds with HTTP code, such as 500
* <p/>
* - all other info: http://docs.oracle.com/javaee/6/api/javax/ws/rs/core/Response.Status.html
*/
public void afterPropertiesSet() throws Exception {
logger.debug("ServletContextListener started");
final List<ServerEntity> listToScan = adminService.getAllServers();
final SystemSettingsModel settings = employeeService.getSettingsByName("default");
// setting task to execute;
ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(MYTHREADS);
ApplicationContext context =
new ClassPathXmlApplicationContext(new String[]{"classpath:application-context.xml"});
scheduler.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
// iterating list of all servers
for (ServerEntity serverEntity : listToScan) {
// check if state of server is active
if (serverEntity.getActive().equals(1)) {
ServerState state;
try {
// setting URL or IP eith Port of target address
URL obj = new URL(serverEntity.getAddress() + ":" + serverEntity.getPort());
// establishing connection
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
con.setRequestMethod("GET");
// setting timeout of response
con.setConnectTimeout(settings.getTimeoutOfRespond());
// add request header
con.setRequestProperty("User-Agent", USER_AGENT);
if (con.getResponseCode() == 200) {
state = ServerState.OK;
} else if (con.getResponseCode() == 500) {
state = ServerState.FAIL; // Internal Server Error
} else {
state = ServerState.WARN; // BAD_REQUEST or other conflict
}
} catch (Exception e) {
state = ServerState.FAIL;
}
// saving response from server
serverEntity.setState(state);
serverEntity.setResponse(state.toString());
serverEntity.setLastCheck(timestamp);
adminService.updateServer(serverEntity);
} // if
} // run()
} // for
/*
* Scheduling Fixed Rate of scan
*
* param initialDelay the time to delay first execution;
* param period the period between successive executions;
* param unit the time unit of the initialDelay and period parameters;
*/
}, 0, settings.getServerScanInterval(), TimeUnit.SECONDS);
} // executeScanner()
}
在调试中，app开始循环这一行：
(DefaultListableBeanFactory.java:preInstantiateSingletons:596) Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@410bf486: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,adminPasswordUpdateController,adminSettingsController,employeeDeleteController,employeeEditController,employeeManagementController,employeeRegistrationController,serverAssignmentController,serverDeleteController,serverEditController,serverManagementController,serverRegistrationController,employeePasswordUpdateController,serverDetailsController,serverMonitoringController,loginLogoutController,passwordRecoveryController,employeeJdbcDaoSupport,serverJdbcDaoSupport,settingsJdbcDaoSupport,AdminServiceImpl,AnonymousServiceImpl,EmployeeServiceImpl,userAuthentication,customUtilsImpl,CustomMailDeliveryImpl,scheduledScanner,simpleScannerImpl,employeeRegistrationValidator,employeeUpdateValidatior,passwordRecoveryValidator,passwordUpdateValidator,serverRegistrationValidator,settingsUpdateValidator,org.springframework.aop.config.internalAutoProxyCreator,org.springframework.transaction.annotation.AnnotationTransactionAttributeSource#0,org.springframework.transaction.interceptor.TransactionInterceptor#0,org.springframework.transaction.config.internalTransactionAdvisor,txManager,dataSource,org.springframework.jdbc.datasource.init.DataSourceInitializer#0,log4jInitialization,mvcContentNegotiationManager,org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping#0,org.springframework.format.support.FormattingConversionServiceFactoryBean#0,org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter#0,org.springframework.web.servlet.handler.MappedInterceptor#0,org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver#0,org.springframework.web.servlet.mvc.annotation.ResponseStatusExceptionResolver#0,org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver#0,org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping,org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter,org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter,org.springframework.web.servlet.resource.ResourceHttpRequestHandler#0,org.springframework.web.servlet.handler.SimpleUrlHandlerMapping#0,org.springframework.web.servlet.handler.MappedInterceptor#1,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy
更新： 我删除了@Component注释并删除了配置行中的循环，但是方法没有像预期的那样循环。
这是application-context.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd">
<!-- Activates annotations scan, declares support for all the general annotations
like @Autowired, @Resource, @Required, @PostConstruct-->
<context:annotation-config/>
<!-- Scans for annotated components in base-package -->
<context:component-scan base-package="serverMonitoring"/>
<!-- Spring modules -->
<import resource="classpath:/spring/spring-data-source.xml"/>
<import resource="classpath:/spring/spring-logging.xml"/>
<import resource="classpath:/spring/spring-mvc.xml"/>
<import resource="classpath:/spring/spring-mail.xml"/>
<bean id="scheduledScanner" class="serverMonitoring.util.network.impl.ScheduledScanner" />
</beans>
尽管如此，我的scaner并没有执行扫描循环。
答案 0 :(得分：2)
您的代码在其他地方阻止，而不是SchedulerExecutorService。下面的代码工作正常。
public static class MyBean implements InitializingBean {
@Override
public void afterPropertiesSet() throws Exception {
ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(13);
scheduler.scheduleAtFixedRate(new Runnable() {
@Override
public void run() {
System.out.println("Hello from scheduler");
}
}, 0, 5, TimeUnit.SECONDS);
}
}
@Configuration
public static class Config {
@Bean
public MyBean myBean() {
return new MyBean();
}
}
public static void main(String[] args) {
AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Config.class);
System.out.println(context.getBean(MyBean.class));
}
答案 1 :(得分：0)
我解决了这个问题。主要问题是在服务级别上抛出了AuthenticationCredentialsNotFoundException，因此在使用上下文和初始化几天后，我用DAO级别更改了服务级别并返回了@Component注释。