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余姚做网站设计,关键词优化公司排名,网站建设成本分析,域名备案查询网站备案信息1.什么是olingo？ Apache Olingo 是个 Java 库，用来实现 Open Data Protocol (OData)。 Apache Olingo 包括服务客户端和 OData 服务器方面。 Open Data Protocol （开放数据协议，OData） 是用来查询和更新数据的一种W…

1.什么是olingo？

Apache Olingo 是个 Java 库，用来实现 Open Data Protocol (OData)。 Apache Olingo 包括服务客户端和 OData 服务器方面。

Open Data Protocol （开放数据协议，OData）

是用来查询和更新数据的一种Web协议，其提供了把存在于应用程序中的数据暴露出来的方式。OData运用且构建于很多 Web技术之上，比如HTTP、Atom Publishing Protocol（AtomPub）和JSON，提供了从各种应用程序、服务和存储库中访问信息的能力。OData被用来从各种数据源中暴露和访问信息， 这些数据源包括但不限于：关系数据库、文件系统、内容管理系统和传统Web站点。

2.代码工程

实验目标

利用olingo实现oData协议

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><parent><artifactId>springboot-demo</artifactId><groupId>com.et</groupId><version>1.0-SNAPSHOT</version></parent><modelVersion>4.0.0</modelVersion><artifactId>olingo</artifactId><properties><maven.compiler.source>8</maven.compiler.source><maven.compiler.target>8</maven.compiler.target></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-autoconfigure</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency><dependency><groupId>org.apache.olingo</groupId><artifactId>olingo-odata2-core</artifactId><version>2.0.11</version><exclusions><exclusion><groupId>javax.ws.rs</groupId><artifactId>javax.ws.rs-api</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.apache.olingo</groupId><artifactId>olingo-odata2-jpa-processor-core</artifactId><version>2.0.11</version></dependency><dependency><groupId>org.apache.olingo</groupId><artifactId>olingo-odata2-jpa-processor-ref</artifactId><version>2.0.11</version><exclusions><exclusion><groupId>org.eclipse.persistence</groupId><artifactId>eclipselink</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jersey</artifactId></dependency></dependencies><profiles><profile><id>local</id><activation><activeByDefault>true</activeByDefault></activation><properties><activatedProperties>local</activatedProperties></properties><dependencies><dependency><groupId>com.h2database</groupId><artifactId>h2</artifactId><scope>runtime</scope></dependency></dependencies></profile><profile><id>cloud</id><activation><activeByDefault>false</activeByDefault></activation><properties><activatedProperties>cloud</activatedProperties></properties></profile></profiles><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build>
</project>

config

package com.et.olingo.config;import com.et.olingo.service.OdataJpaServiceFactory;
import org.apache.olingo.odata2.api.ODataServiceFactory;
import org.apache.olingo.odata2.core.rest.ODataRootLocator;
import org.apache.olingo.odata2.core.rest.app.ODataApplication;
import org.glassfish.jersey.server.ResourceConfig;
import org.springframework.stereotype.Component;import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.Path;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerRequestFilter;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
import javax.ws.rs.core.Context;
import javax.ws.rs.ext.Provider;
import java.io.IOException;@Component
@ApplicationPath("/odata")
public class JerseyConfig extends ResourceConfig {public JerseyConfig(OdataJpaServiceFactory serviceFactory, EntityManagerFactory entityManagerFactory) {ODataApplication oDataApplication = new ODataApplication();oDataApplication.getClasses().forEach( c -> {if ( !ODataRootLocator.class.isAssignableFrom(c)) {register(c);}});register(new ODataServiceRootLocator(serviceFactory));register(new EntityManagerFilter(entityManagerFactory));}@Path("/")public static class ODataServiceRootLocator extends ODataRootLocator {private OdataJpaServiceFactory serviceFactory;@Injectpublic ODataServiceRootLocator (OdataJpaServiceFactory serviceFactory) {this.serviceFactory = serviceFactory;}@Overridepublic ODataServiceFactory getServiceFactory() {return this.serviceFactory;}}@Providerpublic static class EntityManagerFilter implements ContainerRequestFilter,ContainerResponseFilter {public static final String EM_REQUEST_ATTRIBUTE =EntityManagerFilter.class.getName() + "_ENTITY_MANAGER";private final EntityManagerFactory entityManagerFactory;@Contextprivate HttpServletRequest httpRequest;public EntityManagerFilter(EntityManagerFactory entityManagerFactory) {this.entityManagerFactory = entityManagerFactory;}@Overridepublic void filter(ContainerRequestContext containerRequestContext) throws IOException {EntityManager entityManager = this.entityManagerFactory.createEntityManager();httpRequest.setAttribute(EM_REQUEST_ATTRIBUTE, entityManager);if (!"GET".equalsIgnoreCase(containerRequestContext.getMethod())) {entityManager.getTransaction().begin();}}@Overridepublic void filter(ContainerRequestContext requestContext,ContainerResponseContext responseContext) throws IOException {EntityManager entityManager = (EntityManager) httpRequest.getAttribute(EM_REQUEST_ATTRIBUTE);if (!"GET".equalsIgnoreCase(requestContext.getMethod())) {EntityTransaction entityTransaction = entityManager.getTransaction(); //we do not commit because it's just a READif (entityTransaction.isActive() && !entityTransaction.getRollbackOnly()) {entityTransaction.commit();}}entityManager.close();}}}

controller

package com.et.olingo.controller;import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.HashMap;
import java.util.Map;@RestController
public class HelloWorldController {@RequestMapping("/hello")public Map<String, Object> showHelloWorld(){Map<String, Object> map = new HashMap<>();map.put("msg", "HelloWorld");return map;}
}

entity

138327882-76404655-f383-46e6-82af-677560b5ccee

service

package com.et.olingo.service;import com.et.olingo.entity.Child;
import org.apache.olingo.odata2.api.edm.EdmException;
import org.apache.olingo.odata2.api.ep.EntityProviderException;
import org.apache.olingo.odata2.api.exception.ODataException;
import org.apache.olingo.odata2.api.exception.ODataNotFoundException;
import org.apache.olingo.odata2.api.processor.ODataResponse;
import org.apache.olingo.odata2.api.uri.info.*;
import org.apache.olingo.odata2.jpa.processor.api.ODataJPAContext;
import org.apache.olingo.odata2.jpa.processor.api.ODataJPADefaultProcessor;
import org.apache.olingo.odata2.jpa.processor.api.exception.ODataJPAModelException;
import org.apache.olingo.odata2.jpa.processor.api.exception.ODataJPARuntimeException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.io.InputStream;
import java.util.List;public class CustomODataJpaProcessor extends ODataJPADefaultProcessor {private Logger logger = LoggerFactory.getLogger(getClass());public CustomODataJpaProcessor(ODataJPAContext oDataJPAContext) {super(oDataJPAContext);}@Overridepublic ODataResponse readEntitySet(final GetEntitySetUriInfo uriParserResultView, final String contentType) throws ODataJPAModelException, ODataJPARuntimeException, EdmException {logger.info("READ: Entity Set {} called", uriParserResultView.getTargetEntitySet().getName());try {List<Object> jpaEntities = jpaProcessor.process(uriParserResultView);return responseBuilder.build(uriParserResultView, jpaEntities, contentType);} finally {this.close();}}@Overridepublic ODataResponse readEntity(final GetEntityUriInfo uriParserResultView, final String contentType) throws ODataJPAModelException, ODataJPARuntimeException, ODataNotFoundException, EdmException {ODataResponse response = null;if (uriParserResultView.getKeyPredicates().size() > 1) {logger.info("READ: Entity {} called with key {} and key {}", uriParserResultView.getTargetEntitySet().getName(), uriParserResultView.getKeyPredicates().get(0).getLiteral(), uriParserResultView.getKeyPredicates().get(1).getLiteral());} else {logger.info("READ: Entity {} called with key {}", uriParserResultView.getTargetEntitySet().getName(), uriParserResultView.getKeyPredicates().get(0).getLiteral());}try {Object readEntity = jpaProcessor.process(uriParserResultView);response = responseBuilder.build(uriParserResultView, readEntity, contentType);} finally {this.close();}return response;}@Overridepublic ODataResponse createEntity(final PostUriInfo uriParserResultView, final InputStream content, final String requestContentType, final String contentType) throws ODataJPAModelException, ODataJPARuntimeException, ODataNotFoundException, EdmException, EntityProviderException {logger.info("POST: Entity {} called", uriParserResultView.getTargetEntitySet().getName());ODataResponse response = null;try {Object createdEntity = jpaProcessor.process(uriParserResultView, content, requestContentType);if (createdEntity.getClass().equals(Child.class)) {response = postProcessCreateChild(createdEntity, uriParserResultView, contentType);} else {response = responseBuilder.build(uriParserResultView, createdEntity, contentType);}} finally {this.close();}return response;}@Overridepublic ODataResponse updateEntity(final PutMergePatchUriInfo uriParserResultView, final InputStream content,final String requestContentType, final boolean merge, final String contentType) throws ODataException, ODataJPAModelException, ODataJPARuntimeException, ODataNotFoundException {logger.info("PUT: Entity {} called with key {}", uriParserResultView.getTargetEntitySet().getName(), uriParserResultView.getKeyPredicates().get(0).getLiteral());ODataResponse response = null;try {Object updatedEntity = jpaProcessor.process(uriParserResultView, content, requestContentType);response = responseBuilder.build(uriParserResultView, updatedEntity);} finally {this.close();}return response;}@Overridepublic ODataResponse deleteEntity(DeleteUriInfo uriParserResultView, String contentType) throws ODataException {logger.info("DELETE: Entity {} called with key {}", uriParserResultView.getTargetEntitySet().getName(), uriParserResultView.getKeyPredicates().get(0).getLiteral());ODataResponse oDataResponse = null;try {this.oDataJPAContext.setODataContext(this.getContext());Object deletedEntity = this.jpaProcessor.process(uriParserResultView, contentType);oDataResponse = this.responseBuilder.build(uriParserResultView, deletedEntity);} finally {this.close();}return oDataResponse;}private ODataResponse postProcessCreateChild(Object createdEntity, PostUriInfo uriParserResultView, String contentType) throws ODataJPARuntimeException, ODataNotFoundException {Child child = (Child) createdEntity;if (child.getSurname() == null || child.getSurname().equalsIgnoreCase("")) {if (child.getMother().getSurname() != null && !child.getMother().getSurname().equalsIgnoreCase("")) {child.setSurname(child.getMother().getSurname());} else if (child.getMother().getSurname() != null && !child.getFather().getSurname().equalsIgnoreCase("")) {child.setSurname(child.getFather().getSurname());} else {child.setSurname("Gashi");}}return responseBuilder.build(uriParserResultView, createdEntity, contentType);}}
package com.et.olingo.service;import com.et.olingo.config.JerseyConfig;
import org.apache.olingo.odata2.api.ODataService;
import org.apache.olingo.odata2.api.ODataServiceFactory;
import org.apache.olingo.odata2.api.edm.provider.EdmProvider;
import org.apache.olingo.odata2.api.exception.ODataException;
import org.apache.olingo.odata2.api.processor.ODataContext;
import org.apache.olingo.odata2.api.processor.ODataSingleProcessor;
import org.apache.olingo.odata2.jpa.processor.api.ODataJPAContext;
import org.apache.olingo.odata2.jpa.processor.api.exception.ODataJPARuntimeException;
import org.apache.olingo.odata2.jpa.processor.api.factory.ODataJPAAccessFactory;
import org.apache.olingo.odata2.jpa.processor.api.factory.ODataJPAFactory;import javax.persistence.EntityManager;
import javax.servlet.http.HttpServletRequest;public class CustomODataServiceFactory extends ODataServiceFactory {private ODataJPAContext oDataJPAContext;private ODataContext oDataContext;@Overridepublic final ODataService createService(final ODataContext context) throws ODataException {oDataContext = context;oDataJPAContext = initializeODataJPAContext();validatePreConditions();ODataJPAFactory factory = ODataJPAFactory.createFactory();ODataJPAAccessFactory accessFactory = factory.getODataJPAAccessFactory();if (oDataJPAContext.getODataContext() == null) {oDataJPAContext.setODataContext(context);}ODataSingleProcessor oDataSingleProcessor = new CustomODataJpaProcessor(oDataJPAContext);EdmProvider edmProvider = accessFactory.createJPAEdmProvider(oDataJPAContext);return createODataSingleProcessorService(edmProvider, oDataSingleProcessor);}private void validatePreConditions() throws ODataJPARuntimeException {if (oDataJPAContext.getEntityManager() == null) {throw ODataJPARuntimeException.throwException(ODataJPARuntimeException.ENTITY_MANAGER_NOT_INITIALIZED, null);}}public final ODataJPAContext getODataJPAContext()throws ODataJPARuntimeException {if (oDataJPAContext == null) {oDataJPAContext = ODataJPAFactory.createFactory().getODataJPAAccessFactory().createODataJPAContext();}if (oDataContext != null)oDataJPAContext.setODataContext(oDataContext);return oDataJPAContext;}protected ODataJPAContext initializeODataJPAContext() throws ODataJPARuntimeException {ODataJPAContext oDataJPAContext = this.getODataJPAContext();ODataContext oDataContext = oDataJPAContext.getODataContext();HttpServletRequest request = (HttpServletRequest) oDataContext.getParameter(ODataContext.HTTP_SERVLET_REQUEST_OBJECT);EntityManager entityManager = (EntityManager) request.getAttribute(JerseyConfig.EntityManagerFilter.EM_REQUEST_ATTRIBUTE);oDataJPAContext.setEntityManager(entityManager);oDataJPAContext.setPersistenceUnitName("default");oDataJPAContext.setContainerManaged(true);return oDataJPAContext;}
}
package com.et.olingo.service;import org.springframework.stereotype.Component;@Component
public class OdataJpaServiceFactory extends CustomODataServiceFactory {//need this wrapper class for the spring framework, otherwise we face issues when auto wiring directly the CustomODataServiceFactory
}

application.yaml

spring.h2.console.enabled=true
spring.h2.console.path=/console

以上只是一些关键代码，所有代码请参见下面代码仓库

代码仓库

  • GitHub - Harries/springboot-demo: a simple springboot demo with some components for example: redis,solr,rockmq and so on.

3.测试

启动spring Boot应用

元数据查看

http://localhost:8080/odata/$metadata

138900236-f6ba4cca-c3e4-49ea-97c3-e80e5835aa7d

插入

167310946-febc1bc1-e898-4d31-aa94-efb423e69d1d

查询

167310988-142c61c2-49ab-487d-927e-0f6edd1e6376

4.引用

  • https://github.com/ECasio/olingo-spring-example
  • Apache Olingo Library
  • Spring Boot集成olingo快速入门demo | Harries Blog™
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