hessian demo和hessian与spring整合demo
Hessian是一个轻量级的remoting on http工具,使用简单的方法提供了RMI(Remote Method Invocation,远程方法调用)的功能。采用的是二进制RPC(Remote Procedure Call Protocol,远程过程调用协议)协议,因为采用的是二进制协议,所以它很适合于发送二进制数据。
在进行基于Hessian的项目开发时,应当注意以下几点:
▲JAVA服务器端必须具备以下几点:
•包含Hessian的jar包。
•设计一个接口,用来给客户端调用。
•实现该接口的功能。
•配置web.xml,配好相应的servlet。
•对象必须实现Serializable 接口。
•对于复杂对像可以使用Map的方法传递。
▲客户端必须具备以下几点:
•java客户端包含Hessian.jar的包。
•具有和服务器端结构一样的接口。
•利用HessianProxyFactory调用远程接口。
下面是一个hessian的简单例子。
Java服务器端:
环境:j2sdk1.4.2、Tomcat6.0
依赖的包:hessian-3.1.6.jar
新建一个名为HessianServer的web project。将hessian-3.1.6.jar放入WEB-INF/lib文件夹中。
创建接口:
- package server.demo;
- public interface DemoApi {
- public void setName(String name);
- public String sayHello();
- public User getUser();
- }
实现接口:
- package server.demo;
- public class DemoService implements DemoApi {
- private String name;
- public String sayHello() {
- return "Hello "+name;
- }
- public void setName(String name) {
- this.name=name;
- System.out.println("Hello "+name);
- }
- public User getUser() {
- return new User("lingling", "pass");
- }
- }
创建User类,注意:一定要implements Serializable。
- package server.demo;
- import java.io.Serializable;
- public class User implements Serializable {
- String name = "kitty";
- String password = "nopass";
- public User() {
- super();
- }
- public User(String name, String password) {
- super();
- this.name = name;
- this.password = password;
- }
- public String getName() {
- return name;
- }
- public void setName(String name) {
- this.name = name;
- }
- public String getPassword() {
- return password;
- }
- public void setPassword(String password) {
- this.password = password;
- }
- }
配置web.xml:
- <servlet>
- <servlet-name>first</servlet-name>
- <servlet-class>com.caucho.hessian.server.HessianServlet</servlet-class>
- <init-param>
- <param-name>service-class</param-name>
- <param-value>server.demo.DemoService</param-value>
- </init-param>
- </servlet>
- <servlet-mapping>
- <servlet-name>first</servlet-name>
- <url-pattern>/helloworld</url-pattern>
- </servlet-mapping>
将项目发布到tomcat服务器上。
Java客户端:
环境:j2sdk1.4.2
依赖的包:hessian-3.1.6.jar
创建一个名为HessianClient的java project,载入hessian-3.1.6.jar。
创建与服务器一样的接口及User类,注意它们所在的包路径也要与服务器相同,否则会出现java.lang.ClassNotFoundException。
接口:
- package server.demo;
- public interface DemoApi {
- public void setName(String name);
- public String sayHello();
- public User getUser();
- }
User类:
- package server.demo;
- import java.io.Serializable;
- public class User implements Serializable {
- String name = "kitty";
- String password = "nopass";
- public User() {
- super();
- }
- public User(String name, String password) {
- super();
- this.name = name;
- this.password = password;
- }
- public String getName() {
- return name;
- }
- public void setName(String name) {
- this.name = name;
- }
- public String getPassword() {
- return password;
- }
- public void setPassword(String password) {
- this.password = password;
- }
- }
客户端程序:
- package client.demo;
- import java.net.MalformedURLException;
- import server.demo.DemoApi;
- import com.caucho.hessian.client.HessianProxyFactory;
- public class ClientTest {
- public static void main(String[] args) throws MalformedURLException,
- ClassNotFoundException {
- String url = "http://localhost:9520/HessianServer/helloworld";
- HessianProxyFactory factory = new HessianProxyFactory();
- DemoApi api = (DemoApi) factory.create(url);
- api.setName("test");
- System.out.println(api.sayHello());
- System.out.println(api.getUser().getName());
- System.out.println(api.getUser().getPassword());
- }
- }
现在,启动tomcat,运行ClientTest。运行结果:
Hello test
lingling
pass
现在,在以上基础上将hessian与spring整合。
Java服务器端(即我们上面建的名为HessianServer的web project):
环境:j2sdk1.4.2、Tomcat6.0
依赖的包:
1. Hessian包:hessian-3.1.6.jar
2. spring-framework-2.0.2包:
a) aopalliance.jar
b) commons-logging.jar
c) log4j-1.2.14.jar
d) spring.jar
e) spring-aop.jar
f) spring-beans.jar
g) spring-context.jar
h) spring-core.jar
i) spring-jdbc.jar
j) spring-jms.jar
k) spring-web.jar
l) spring-webmvc.jar
配置web.xml,web.xml中增加:
- <servlet>
- <servlet-name>remote</servlet-name>
- <servlet-class>
- org.springframework.web.servlet.DispatcherServlet
- </servlet-class>
- <init-param>
- <param-name>namespace</param-name>
- <param-value>classes/remote-servlet</param-value>
- </init-param>
- <load-on-startup>1</load-on-startup>
- </servlet>
- <servlet-mapping>
- <servlet-name>remote</servlet-name>
- <url-pattern>/remote/*</url-pattern>
- </servlet-mapping>
写spring的发布hessian服务的配置文件remote-servlet.xml,这个文件就建在工程的src下,即deploy到tomcat后,在WEB-INF/classes目录下。注意:这个文件为什么叫remote-servlet.xml呢?因为我们在web.xml中有配置:<param-value>classes/remote-servlet</param-value>所以文件名为remote-servlet.xml。
以下是remote-servlet.xml的内容:
- <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
- <beans>
- <bean id="demoService" class="server.demo.DemoService" />
- <bean name="/helloSpring"
- class="org.springframework.remoting.caucho.HessianServiceExporter">
- <property name="service" ref="demoService" />
- <property name="serviceInterface" value="server.demo.DemoApi" />
- </bean>
- </beans>
好了,现在可以测试一下了。在刚才建的名为HessianClient的java project中修改client.demo.ClientTest.java如下:
- package client.demo;
- import java.net.MalformedURLException;
- import server.demo.DemoApi;
- import com.caucho.hessian.client.HessianProxyFactory;
- public class ClientTest {
- public static void main(String[] args) throws MalformedURLException,
- ClassNotFoundException {
- // String url = "http://localhost:9520/HessianServer/helloworld";
- String url = "http://localhost:9520/HessianServer/remote/helloSpring";
- HessianProxyFactory factory = new HessianProxyFactory();
- DemoApi api = (DemoApi) factory.create(DemoApi.class, url);
- api.setName("test");
- System.out.println(api.sayHello());
- System.out.println(api.getUser().getName());
- System.out.println(api.getUser().getPassword());
- }
- }
现在,启动tomcat,运行ClientTest。运行结果:
Hello test
lingling
pass
如果客户端也使用spring呢?现在做一个spring整合hessian的客户端demo。首先载入spring-framework-2.0.2包:
1) aopalliance.jar
2) commons-logging.jar
3) log4j-1.2.14.jar
4) spring.jar
5) spring-aop.jar
6) spring-beans.jar
7) spring-context.jar
8) spring-core.jar
9) spring-jdbc.jar
10) spring-jms.jar
11) spring-web.jar
12) spring-webmvc.jar
在名为HessianClient的java project中src目录下,新建一个remote-client.xml,这个文件可随意命名。remote-client.xml内容为:
- <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
- <beans>
- <bean id="helloSpring"
- class="org.springframework.remoting.caucho.HessianProxyFactoryBean">
- <property name="serviceUrl">
- <value>
- http://localhost:9520/HessianServer/remote/helloSpring
- </value>
- </property>
- <property name="serviceInterface">
- <value>server.demo.DemoApi</value>
- </property>
- </bean>
- </beans>
在刚才建的名为HessianClient的java project中修改client.demo.ClientTest.java如下:
- package client.demo;
- import java.net.MalformedURLException;
- import org.springframework.context.ApplicationContext;
- import org.springframework.context.support.ClassPathXmlApplicationContext;
- import server.demo.DemoApi;
- public class ClientTest {
- public static void main(String[] args) throws MalformedURLException,
- ClassNotFoundException {
- // String url = "http://localhost:9520/HessianServer/helloworld";
- // String url =
- // "http://localhost:9520/HessianServer/remote/helloSpring";
- // HessianProxyFactory factory = new HessianProxyFactory();
- // DemoApi api = (DemoApi) factory.create(DemoApi.class, url);
- ApplicationContext context = new ClassPathXmlApplicationContext(
- "remote-client.xml");
- DemoApi api = (DemoApi) context.getBean("helloSpring");
- api.setName("test");
- System.out.println(api.sayHello());
- System.out.println(api.getUser().getName());
- System.out.println(api.getUser().getPassword());
- }
- }
现在,启动tomcat,运行ClientTest。运行结果:
Hello test
lingling
pass
至此over~
PS:有时候可能因hessian或spring的版本问题使程序不能运行