小试Hessian实现Webservice

2019独角兽企业重金招聘Python工程师标准>>>

Hessian是一个轻量级的remoting on http工具,采用的是Binary RPC协议&＃xff0c;所以它很适合于发送二进制数据,同时又具有防火墙穿透能力。Hessian一般是通过Web应用来提供服务&＃xff0c;因此非常类似于平时我们用的WebService。只是它不使用SOAP协议,但相比webservice而言更简单、快捷。

Hessian官网&＃xff1a;http://hessian.caucho.com/

Hessian可通过Servlet提供远程服务&＃xff0c;需要将匹配某个模式的请求映射到Hessian服务。也可Spring框架整合&＃xff0c;通过它的DispatcherServlet可以完成该功能&＃xff0c;DispatcherServlet可将匹配模式的请求转发到Hessian服务。Hessian的server端提供一个servlet基类, 用来处理发送的请求&＃xff0c;而Hessian的这个远程过程调用&＃xff0c;完全使用动态代理来实现的,&＃xff0c;建议采用面向接口编程&＃xff0c;Hessian服务通过接口暴露。

Hessian处理过程示意图&＃xff1a;

客户端——>序列化写到输出流——>远程方法(服务器端)——>序列化写到输出流 ——>客户端读取输入流——>输出结果

下面详细介绍最常用的两种方式实现Hessian提供webservice&＃xff1a;

纯Hessian实现

配合Spring框架实现

在开始之前当然需要到官网上下载相关的lib包&＃xff0c;放入项目的/WEB-INF/lib/下

【一】、纯Hessian实现步骤&＃xff1a;

1.基本代码

首先编写一个服务的接口类&＃xff1a;HelloHessian.java

package michael.hessian; import java.util.List; import java.util.Map; /** * &＃64;author michael * */ public interface HelloHessian { String sayHello(); MyCar getMyCar(); List myLoveFruit(); Map myBabays(); }

一个java bean文件MyCar.java:

Java代码

package michael.hessian; import java.io.Serializable; /** * &＃64;author michael * */ public class MyCar implements Serializable { /** * */ private static final long serialVersionUID &＃61; 4736905401908455439L; private String carName; private String carModel; /** * &＃64;return the carName */ public String getCarName() { return carName; } /** * &＃64;return the carModel */ public String getCarModel() { return carModel; } /** * &＃64;param pCarName the carName to set */ public void setCarName(String pCarName) { carName &＃61; pCarName; } /** * &＃64;param pCarModel the carModel to set */ public void setCarModel(String pCarModel) { carModel &＃61; pCarModel; } /** * &＃64;see java.lang.Object#toString() * &＃64;return */ &＃64;Override public String toString() { return "my car name:[" &＃43; this.carName &＃43; "] model:[" &＃43; this.carModel &＃43; "]."; } }

服务端接口的实现类&＃xff1a;HelloHessianImpl.java

Java代码

package michael.hessian.impl; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import michael.hessian.HelloHessian; import michael.hessian.MyCar; /** * &＃64;author michael * */ public class HelloHessianImpl extends HessianServlet implements HelloHessian { public MyCar getMyCar() { MyCar car &＃61; new MyCar(); car.setCarName("阿斯顿·马丁"); car.setCarModel("One-77"); return car; } public Map myBabays() { Map map &＃61; new HashMap(); map.put("son", "孙吴空"); map.put("daughter", "孙小美"); return map; } public List myLoveFruit() { List list &＃61; new ArrayList(); list.add("apple"); list.add("kiwi"); list.add("orange"); return list; } public String sayHello() { return "welcom to Hessian"; } }

2.配置文件web.xml修改

在web.xml配置文件里增加如下信息&＃xff1a;

Xml代码

HelloHessianservlet-name> com.caucho.hessian.server.HessianServlet servlet-class> home-classparam-name> michael.hessian.impl.HelloHessianImplparam-value> init-param> home-apiparam-name> michael.hessian.HelloHessianparam-value> init-param> 1load-on-startup> servlet> HelloHessianservlet-name> /HessianServiceurl-pattern> servlet-mapping>

3.java客户端验证

Java代码

package michael.hessian.client; import java.net.MalformedURLException; import java.util.Map; import michael.hessian.HelloHessian; import michael.hessian.MyCar; import com.caucho.hessian.client.HessianProxyFactory; /** * &＃64;author michael * */ public class HessianClientTest { /** * &＃64;param args */ public static void main(String[] args) { String url &＃61; "http://localhost:8082/J2EE_sjsky/HessianService"; HessianProxyFactory factory &＃61; new HessianProxyFactory(); try { HelloHessian hello &＃61; (HelloHessian) factory.create( HelloHessian.class, url); System.out.println(hello.sayHello()); MyCar car &＃61; hello.getMyCar(); System.out.println(car.toString()); for (Map.Entry entry : hello.myBabays().entrySet()) { System.out.println(entry.getKey() &＃43; " " &＃43; entry.getValue()); } for (String str : hello.myLoveFruit()) { System.out.println(str); } } catch (MalformedURLException e) { e.printStackTrace(); } } }

运行结果如下&＃xff1a;

Java代码

welcom to Hessian my car name:[阿斯顿·马丁] model:[One-77]. daughter 孙小美 son 孙吴空 apple kiwi orange

【二】、spring&＃43;hessian 实现服务端&＃xff1a;

1.基本代码见上面的demo

2.修改配置文件

在web.xml&＃xff0c;增加内容如下&＃xff1a;

Xml代码

springhessianservlet-name> org.springframework.web.servlet.DispatcherServlet servlet-class> bean> beans>

3.java客户端验证

和上面的例子相似&＃xff0c;只需要把访问的url替换成新的即可如下&＃xff1a;

Java代码

String url&＃61;http://localhost:8082/J2EE_sjsky/springhessian/helloHessianService

运行结果和上面例子一样。

4.spring配置客户端

增加一个spring的bean配置文件hessian-client.xml

Xml代码

xml version&＃61;"1.0" encoding&＃61;"UTF-8"?> > http://localhost:8082/J2EE_sjsky/springhessian/helloHessianService value> property> bean> beans>

测试代码HessianSpringClient.java&＃xff1a;

Java代码

package michael.hessian.client; import java.util.Map; import michael.hessian.HelloHessian; import michael.hessian.MyCar; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; /** * &＃64;author michael * */ public class HessianSpringClient { /** * &＃64;param args */ public static void main(String[] args) { try { ApplicationContext context &＃61; new ClassPathXmlApplicationContext( "hessian-client.xml"); HelloHessian hello &＃61; (HelloHessian) context .getBean("helloHessianClient"); System.out.println(hello.sayHello()); MyCar car &＃61; hello.getMyCar(); System.out.println(car.toString()); for (Map.Entry entry : hello.myBabays().entrySet()) { System.out.println(entry.getKey() &＃43; " " &＃43; entry.getValue()); } for (String str : hello.myLoveFruit()) { System.out.println(str); } } catch (Exception e) { e.printStackTrace(); } } }

运行结果和上面完全一致。