具有多个查询参数的Camel CXF服务

出色的Apache Camel团队忙于解决查询中多个参数的处理问题，这是一种解决方法。希望该帖子将在下一版本的Camel中变得过时。（当前，我使用2.7.5）

问题

大于1的查询参数作为null值传递给Camel-CXF服务。假设网址中有四个查询参数，例如

name=arun&email=arun@arunma.com&age=10&phone=123456

执行以下操作时，只会填充第一个：

MultiQueryParams

@GET
@Path("search")
@Produces(MediaType.APPLICATION_JSON)
public String sourceResultsFromTwoSources(@QueryParam("name") String name, @QueryParam("age") String age,@QueryParam("phone") String phone,@QueryParam("email") String email
);

所有其他参数为null 。

最终输出

对于网址： http://localhost:8181/cxf/karafcxfcamel/search?name=arun&email=arun@arunma.com&age=31&phone=232323预期的结果是：

最终输出

解决方法

有趣的是，我们可以在标头中获取整个查询字符串。

QueryStringHeader

String queryString = exchange.getIn().getHeader(Exchange.HTTP_QUERY, String.class);

然后我们可以做一个

提取参数

MultivaluedMap<String, String> queryMap = JAXRSUtils.getStructuredParams(queryString, "&", false, false);

获取查询参数作为多值Map。

然后可以将查询参数设置为Exchange的属性，并在整个Exchange使用。

码

整个代码可以从github下载

请注意，我在Karaf容器中将Camel作为OSGi的一部分运行。尽管因使用Camel-CXF的环境而导致变通办法没有不同，但从github下载代码时请注意这一事实。请注意用于骆驼配置的xml蓝图。

这里最重要的是路由器

路由器

RestToBeanRouter

package me.rerun.karafcxfcamel.camel.beans;import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.model.dataformat.JsonLibrary;
import org.apache.cxf.jaxrs.utils.JAXRSUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import javax.ws.rs.core.MultivaluedMap;
import java.util.List;
import java.util.Map;public class RestToBeanRouter extends RouteBuilder {private static Logger logger= LoggerFactory.getLogger(RouteBuilder.class);@Overridepublic void configure() throws Exception {from ("cxfrs://bean://rsServer").process(new ParamProcessor()).multicast().parallelProcessing().aggregationStrategy(new ResultAggregator()).beanRef("restServiceImpl", "getNameEmailResult").beanRef("restServiceImpl", "getAgePhoneResult").end().marshal().json(JsonLibrary.Jackson).to("log://camelLogger?level=DEBUG");}private class ParamProcessor implements Processor {@Overridepublic void process(Exchange exchange) throws Exception {String queryString = exchange.getIn().getHeader(Exchange.HTTP_QUERY, String.class);MultivaluedMap<String, String> queryMap = JAXRSUtils.getStructuredParams(queryString, "&", false, false);for (Map.Entry<String, List<String>> eachQueryParam : queryMap.entrySet()) {exchange.setProperty(eachQueryParam.getKey(), eachQueryParam.getValue());}}}
}

接口

RestService

package me.rerun.karafcxfcamel.rest;import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;public interface RestService {@GET@Path("search")@Produces(MediaType.APPLICATION_JSON)public String sourceResultsFromTwoSources();}

实作

RestServiceImpl

package me.rerun.karafcxfcamel.rest;import me.rerun.karafcxfcamel.model.AgePhoneResult;
import me.rerun.karafcxfcamel.model.NameEmailResult;
import me.rerun.karafcxfcamel.service.base.AgePhoneService;
import me.rerun.karafcxfcamel.service.base.NameEmailService;
import me.rerun.karafcxfcamel.service.impl.AgePhoneServiceImpl;
import org.apache.camel.Exchange;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.util.List;public class RestServiceImpl implements RestService {private static Logger logger= LoggerFactory.getLogger(AgePhoneServiceImpl.class);private NameEmailService nameEmailService;private AgePhoneService agePhoneService;public RestServiceImpl(){}//Do nothing. Camel intercepts and routes the requestspublic String sourceResultsFromTwoSources() {return null;}public NameEmailResult getNameEmailResult(Exchange exchange){logger.info("Invoking getNameEmailResult from RestServiceImpl");String name=getFirstEntrySafelyFromList(exchange.getProperty("name", List.class));String email=getFirstEntrySafelyFromList(exchange.getProperty("email", List.class));return nameEmailService.getNameAndEmail(name, email);}public AgePhoneResult getAgePhoneResult(Exchange exchange){logger.info("Invoking getAgePhoneResult from RestServiceImpl");String age=getFirstEntrySafelyFromList(exchange.getProperty("age", List.class));String phone=getFirstEntrySafelyFromList(exchange.getProperty("phone", List.class));return agePhoneService.getAgePhoneResult(age, phone);}public NameEmailService getNameEmailService() {return nameEmailService;}public AgePhoneService getAgePhoneService() {return agePhoneService;}public void setNameEmailService(NameEmailService nameEmailService) {this.nameEmailService = nameEmailService;}public void setAgePhoneService(AgePhoneService agePhoneService) {this.agePhoneService = agePhoneService;}private String getFirstEntrySafelyFromList(List<String> list){if (list!=null && !list.isEmpty()){return list.get(0);}return null;}
}