Apache Camel rest获取GET请求的参数

偏执的太偏执、 2022-11-16 05:56 233阅读 0赞

Apache Camel rest组件内部可以使用多个框架实现rest，比如restlet、jetty、servlet等等，我这里使用restlet

首先加入依赖

<dependency>
    	<groupId>org.apache.camel</groupId>
    	<artifactId>camel-restlet</artifactId>
    	<version>2.15.2</version>
    	<scope>provided</scope>
    </dependency>

这里先配置一个简单的rest服务

<?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:camel="http://camel.apache.org/schema/spring" xsi:schemaLocation=" http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
     
    	<bean id="product" class="com.pp.ProductProcessor" />
    	
    	<camelContext id="restCamelContext" xmlns="http://camel.apache.org/schema/spring">
    		
    		<restConfiguration bindingMode="auto" contextPath="" component="restlet" port="3387"/>
    		
    		<rest path="/api">
    			
    			<get uri="/products" >
    				<to uri="direct:products" />
    			</get>
    		</rest>
    		
    		<route>
    			<from uri="direct:products" />
    			<to uri="bean:product?method=parameter" />
    		</route>
    		
    	</camelContext>
     
    </beans>

启动服务之后，当我们访问  
`http://127.0.0.1:3387/api/products?id=101&type=0` 之后，就会进入到ProductProcessor类的parameter方法  
那么在parameter方法里面，如何获取到这个url的参数呢？

有如下三个方法

**方法一:**  
例如：`localhost:8080/rest/list?code=123,456`

String code = (String) exchange.getIn().getHeader("code");

**方法二：**

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

这样就获取到了url问号后面的所有字符串，然后，分割获取指定的参数

这里使用JDK1.8一行代码搞定

String queryString = "id=1&type=cmcc&name=admin";
    Map<String, String> map = Stream.of(queryString.split("&")).map(obj -> obj.split("=")).collect(Collectors.toMap(entry -> entry[0], entry -> entry[1]));

**方法三：**

package com.pp;
     
    import java.util.Map;
     
    import org.apache.camel.Exchange;
    import org.apache.camel.component.restlet.RestletConstants;
    import org.restlet.data.Form;
    import org.restlet.engine.adapter.HttpRequest;
     
    public class ProductProcessor
    { 
    	public void parameter(Exchange exchange)
    	{ 
    		HttpRequest req = exchange.getIn().getHeader(RestletConstants.RESTLET_REQUEST, HttpRequest.class);
    		
    		Form form = req.getResourceRef().getQueryAsForm();
    		
    		//这个map就是url上面的所有参数
    		Map<String, String> maps = form.getValuesMap();
    		
    		System.out.println(maps.get("id"));//获取id参数
    		System.out.println(maps.get("type"));//获取type参数
    		
    		exchange.getOut().setBody("this is out body");
    	}
    }

**注意：这里的方法三只适用于restlet实现的rest，其它框架实现的rest不适用**