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  • spring_远程调用

    参考文章:

    Spring in Action 学习笔记—第六章 远程调用

    spring的httpInvoker远程调用 示例

    《Spring技术内幕》学习笔记17——Spring HTTP调用器实现远程调用

    Spring HTTP invoker简介

     

    例子:远程服务器上提供了计算两个数的和的接口,利用spring的httpinvoker技术在客户端实现远程调用,将计算功能交给服务器来执行,然后服务器将结果返回给客户端。

     

    服务器端结构:

    客户端机构:

    其中GetSumService.jar是服务器端提供给客户端使用的接口,用来计算两个数的和。就是服务器端com.yuan.service打出的jar包。

     

    服务器端代码分析:

    计算接口(TestService.java):

    1 package com.yuan.service;
    2 
    3 /**
    4  * @author Caihanyuan
    5  * @time 2012-10-26 上午10:56:46
    6  */
    7 public interface TestService {
    8     public double getSum(double numberA, double numberB);
    9 }


    计算接口的实现(TestServiceImp.java):

     1 package com.sunflower.serviceimp;
     2 
     3 import com.yuan.service.TestService;
     4 
     5 /**
     6  * @author Caihanyuan
     7  * @time 2012-10-26 上午10:57:23
     8  */
     9 public class TestServiceImp implements TestService {
    10 
    11     @Override
    12     public double getSum(double numberA, double numberB) {
    13         return numberA + numberB;
    14     }
    15 
    16 }


    在spring配置文件中声明服务的出口(application-context.xml):

     1 <?xml version="1.0" encoding="UTF-8"?>
     2 <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
     3 "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
     4 <beans>
     5     <bean name="httpService"
     6         class="org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter">
     7         <property name="service">
     8             <ref bean="hDao" />
     9         </property>
    10         <property name="serviceInterface">
    11             <value>com.yuan.service.TestService</value>
    12         </property>
    13     </bean>
    14     
    15     <bean id="hDao" class="com.sunflower.serviceimp.TestServiceImp" />
    16     
    17 </beans>

    在org.springframework.remoting.httpinvoker.HttpInvokerServiceExporter配置服务的接口和接口的实现。


    配置服务器的属性(web.xml):

     1 <?xml version="1.0" encoding="UTF-8"?>
     2 <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
     3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     4     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
     5     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
     6 
     7     <context-param>
     8         <param-name>contextConfigLocation</param-name>
     9         <param-value>/WEB-INF/application-context.xml</param-value>
    10     </context-param>
    11 
    12     <listener>
    13         <listener-class>
    14         org.springframework.web.context.ContextLoaderListener
    15         </listener-class>
    16     </listener>
    17 
    18 
    19     <servlet>
    20         <servlet-name>service</servlet-name>
    21         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    22         <load-on-startup>1</load-on-startup>
    23     </servlet>
    24 
    25 
    26     <servlet-mapping>
    27         <servlet-name>service</servlet-name>
    28         <url-pattern>/service/*</url-pattern>
    29     </servlet-mapping>
    30 
    31 
    32 
    33     <welcome-file-list>
    34         <welcome-file>index.jsp</welcome-file>
    35     </welcome-file-list>
    36 </web-app>

    第7~10行配置上下文路径,就是服务出口配置文件的路径。12~16行配置转载上下文的监听器。19~29行配置Http请求中服务对应的路径。

    配置路径映射(service-servlet.xml):

     1 <?xml version="1.0" encoding="UTF-8"?>
     2 <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
     3 "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
     4 <beans>
     5     <bean id="urlMapping"
     6         class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
     7         <property name="mappings">
     8             <props>
     9                 <prop key="/httpService">httpService</prop>
    10             </props>
    11         </property>
    12     </bean>
    13 </beans>

    这个配置文件的名字是有规范的,后缀为-servlet.xml,前缀是上面web.xml中配置的servlet名字。

    客户端代码分析:

    配置远程调用代理(application-context.xml):

     1 <?xml version="1.0" encoding="UTF-8"?>
     2 <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN"
     3 "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
     4 <beans>
     5     <bean id="httpService"
     6         class="org.springframework.remoting.httpinvoker.HttpInvokerProxyFactoryBean">
     7         <property name="serviceUrl">
     8             <value>http://localhost:80/service/service/httpService</value>
     9         </property>
    10         <property name="serviceInterface">
    11             <value>com.yuan.service.TestService</value>
    12         </property>
    13     </bean>
    14 </beans>

     

    测试(Test.java):

     1 package com.yuan.test;
     2 
     3 import org.springframework.context.ApplicationContext;
     4 import org.springframework.context.support.ClassPathXmlApplicationContext;
     5 
     6 import com.yuan.service.TestService;
     7 
     8 /**
     9  * @author Caihanyuan
    10  * @time 2012-10-26 上午11:14:09
    11  */
    12 public class Test {
    13     private static ApplicationContext appContext = new ClassPathXmlApplicationContext(
    14             "application-context.xml");
    15 
    16     public static TestService getTestService() {
    17         return (TestService) appContext.getBean("httpService");
    18     }
    19 
    20     public static void main(String[] args) {
    21         double numberA = 12.5;
    22         double numberB = 52.3;
    23 
    24         System.out.println("sum of numberA and numberB is:"
    25                 + getTestService().getSum(numberA, numberB));
    26 
    27     }
    28 }

    测试结果:

     

    源码下载:http://pan.baidu.com/share/link?shareid=87148&uk=2198762756

    一颗平常心,踏踏实实,平静对待一切
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  • 原文地址:https://www.cnblogs.com/hanyuan/p/2740666.html
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