Java Spring4请求驱动的Bean创建
我正在使用Spring4(SpringBoot)实现RESTWS 基本思想是,我希望使用一个JSON负载,指定一个标识符(例如,社会保险号或其他),并在该标识符上运行多个子服务。 以下是一个示例有效负载:Java Spring4请求驱动的Bean创建,java,spring,spring-mvc,Java,Spring,Spring Mvc,我正在使用Spring4(SpringBoot)实现RESTWS 基本思想是,我希望使用一个JSON负载,指定一个标识符(例如,社会保险号或其他),并在该标识符上运行多个子服务。 以下是一个示例有效负载: { "ssNumber" : "1111111111111111", "subServicesDetails" : [ { "subServiceName" : "Foo" , "requestParameters" : {} }, {
{
"ssNumber" : "1111111111111111",
"subServicesDetails" :
[
{ "subServiceName" : "Foo" , "requestParameters" : {} },
{ "subServiceName" : "Dummy", "requestParameters" : {} }
]
}
在我的代码中,我有多个“子服务”(FooService
,DummyService
)实现子服务
接口:
package com.johnarnold.myws.service;
import com.johnarnold.myws.model.SubServiceDetails;
public interface SubService {
public boolean service(String ssNumber, SubServiceDetails ssd);
}
下面是FooService
代码。
软件包com.johnanold.myws.service
import java.util.HashMap;
import java.util.Map;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import com.johnarnold.myws.dao.FooDao;
import com.johnarnold.myws.model.Foo;
import com.johnarnold.myws.model.SubServiceDetails;
@Component
public class FooService implements SubService{
private static Logger log = Logger.getLogger(FooService.class);
@Autowired
private FooDao dao;
public FooService()
{
log.debug("FooService ctor");
}
public boolean service(String ssNumber, SubServiceDetails ssd)
{
log.debug("FooService service");
Map <String, String> responseParameters = new HashMap<String, String>();
try
{
Foo foo = dao.getFoo(ssNumber);
if(foo.isCompromised())
{
responseParameters.put("listed", "true");
}
else
{
responseParameters.put("listed", "false");
}
ssd.setResponseParameters(responseParameters);
return true;
}
catch(Throwable ex)
{
log.error("Exception in service ", ex);
}
return false;
}
}
为了完整起见,这里是控制器:
package com.johnarnold.myws.controller;
import javax.servlet.http.HttpServletRequest;
import javax.validation.Valid;
import org.apache.log4j.Logger;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.johnarnold.myws.model.RawsPayload;
import com.johnarnold.myws.model.SubServiceDetails;
import com.johnarnold.myws.service.SubService;
import com.johnarnold.myws.service.SubServiceFactory;
import com.johnarnold.myws.web.ValidMessage;
@RestController
@RequestMapping("/raws/")
public class RawsController {
private static final Logger logger = Logger.getLogger(RawsController.class);
//@Autowired
//SubService [] subSvcs;
@RequestMapping(value="/{version}/status", method=RequestMethod.GET)
public ResponseEntity<ValidMessage> getServiceStatus()
{
return new ResponseEntity<>(new ValidMessage() , HttpStatus.OK);
}
/*
* Main entry point - orchestrates all of the WS Sub Services
*/
@RequestMapping(value="/{version}/raws", method=RequestMethod.PUT)
public ResponseEntity<String> raws(@Valid @RequestBody RawsPayload rawsPayload,
HttpServletRequest request)
{
logger.info("Request received");
System.out.println("payl " + rawsPayload);
System.out.println("ssNumber=" + rawsPayload.getSsNumber());
System.out.println("sub svcs details=" + rawsPayload.getSubServicesDetails().length);
SubServiceDetails[] subServiceDetails = rawsPayload.getSubServicesDetails();
for(SubServiceDetails ssd : subServiceDetails)
{
String subServiceNameStr = ssd.getSubServiceName();
System.out.println("svcname=" + subServiceNameStr);
System.out.println("svc req params=" + ssd.getRequestParameters());
System.out.println("svc resp params=" + ssd.getResponseParameters());
SubService subService = SubServiceFactory.createSubService(subServiceNameStr);
// Probably wrap the below with some timings
subService.service(rawsPayload.getSsNumber(), ssd);
}
//System.out.println("svcs are " + subSvcs + "size=" + subSvcs.length);
return new ResponseEntity<>("foo" , HttpStatus.OK);
}
}
我已经阅读了关于Spring4条件bean的StackOverflow的许多答案,但是这个功能似乎是针对上下文/配置类型信息,而不是请求消息内容(如本例所示)。
谁能给我指一下正确的方向吗。如有必要,我可以提供进一步的背景
KRgds
John解决此问题的两种可能方法:
- 将所有子服务bean添加到Spring上下文中,然后使用。这是一种更好的方法(从架构的角度来看),但是如果您以前从未使用过这个概念,那么实现它可能需要更多的时间
- 将子服务bean作为列表注入到主服务中,然后从中进行选择。它看起来像这样:
@Component public class SubServiceFactory implements BeanFactoryAware{ private BeanFactory beanFactory; private static final String MY_SERVICE_SUFFIX = "Service"; @Override public void setBeanFactory(BeanFactory beanFactory) throws BeansException { this.beanFactory = beanFactory; } public <T> T getServiceImplementation(String name, Class<T> requiredType) { return beanFactory.getBean(name + MY_SERVICE_SUFFIX, requiredType); } }
@Autowired Map<String, SubService> subServices;
@Bean 公共列表子服务(){ 列表=新的子服务(); 添加(新的AService()); 添加(新的BService()); 退货清单; }
@john arnold首先,像这样包装所有服务,或者用@Service/@Component注释它们,并使用下面这样的显式名称:名称以
subServiceName
param的值开头,并在这里包含一个通用后缀“Service”,这一点很重要
@Bean("FooService")
public SubService fooService() {
return new FooService();
}
@Bean("DummyService")
public SubService dummyService() {
return new DummyService();
}
然后像这样改变你的工厂:
@Component
public class SubServiceFactory implements BeanFactoryAware{
private BeanFactory beanFactory;
private static final String MY_SERVICE_SUFFIX = "Service";
@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
this.beanFactory = beanFactory;
}
public <T> T getServiceImplementation(String name, Class<T> requiredType) {
return beanFactory.getBean(name + MY_SERVICE_SUFFIX, requiredType);
}
}
@Autowired
Map<String, SubService> subServices;
这将返回您的bean或异常(如果找不到)。如果您不想要异常,您可以捕获它并返回null,或者您可以仅为这些异常创建服务imp并返回该实例。你的选择
编辑:
作为一种快捷方式,您可以定义imp.bean,然后将其添加到rest端点
@Autowired
private Map<String, SubService> mySubServices;
@Autowired
私有地图订阅服务;
Spring将自动注入所有imp.ref,所以您可以只使用map的get()方法。但是我更喜欢第一个。你不需要任何花哨的东西。只需实现实现服务接口的所有服务,使用
@Component
或@service
对它们进行注释,然后像往常一样扫描它们
然后,无论您在何处必须选择一个具体的服务实现,都可以像这样自动连接服务的所有实现:
@Component
public class SubServiceFactory implements BeanFactoryAware{
private BeanFactory beanFactory;
private static final String MY_SERVICE_SUFFIX = "Service";
@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
this.beanFactory = beanFactory;
}
public <T> T getServiceImplementation(String name, Class<T> requiredType) {
return beanFactory.getBean(name + MY_SERVICE_SUFFIX, requiredType);
}
}
@Autowired
Map<String, SubService> subServices;
其中,subServiceName
是您在JSON中接收的子服务的未大写名称(即,如果您正在接收Foo
,这将是Foo
)
约定是使用实现接口的类的未大写名称作为bean名称,即对于
FooService
类,bean名称将是FooService
,这是您必须在地图中查找的关键。非常有教育意义的答案
SubService fooSubService = subServices.get(subServiceName + "Service");