Hessian进展远程对象调用（转）
具体网址参见如下：
http://baike.baidu.com/view/2255290.htm
Hessian
百科名片
Hessian是一个轻量级的remoting onhttp工具，使用简单的方法提供了RMI的功能. 相比WebService，Hessian更简单、快捷。采用的是二进制RPC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
Hessian 介绍
注意事项
服务器端
新建一个名EasyHession 的webProject 项目, 将Hessian.jar 放入web-inf 下的lib 中
创建接口：
packageapp.demo;
public interfaceBasicAPI {
public void setGreeting(Stringgreeting);
public String hello();
public User getUser();
}
实现接口：
packageapp.demo;
publicclass BasicService implements BasicAPI {
privateString _greeting = "Hello, world";
public void setGreeting(String greeting)
{
_greeting = greeting;
System.out.println("set greetingsuccess:"+_greeting);
}
public String hello()
{
return _greeting ；
}
public User getUser() {
return new User("prance", "meshow");
}
}
创建一个实现Serializable 的projo 类也可以是Bean 。
package app.demo;
import java.io.Serializable;
public class User implements Serializable{
String userName ="snoopy";
String password ="showme";
public User(Stringuser, String pwd) {
this.userName =user;
this.password= pwd;
}
public StringgetUserName() {
returnuserName;
}
public StringgetPassword() {
returnpassword;
}
}
接下来是配置web.xml
<?xml version="1.0"encoding="UTF-8"?>
<web-app version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>hello</servlet-name>
<servlet-class>com.caucho.hessian.server.HessianServlet</servlet-class>
<init-param>
<param-name>service-class</param-name>
<param-value>app.demo.BasicService</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>hello</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
</web-app>
为了测试可以在编辑一个简单的test.jsp
<%@ pageimport="com.caucho.hessian.client.HessianProxyFactory,
app.demo.BasicAPI"%>
<%@page language="java"%>
<%
HessianProxyFactory factory = newHessianProxyFactory();
String url = ("http://" +request.getServerName() + ":" +request.getServerPort() +
request.getContextPath() + "/hello");
out.println(url);
BasicAPI basic = (BasicAPI) factory.create(BasicAPI.class,url);
out.println("Hello: " + basic.hello());
out.println("Hello: " + basic.getUser() .getUserName() );
out.println("Hello: " +basic.getUser().getPassword() );
%>
将一切配置成功后，将项目发布到web 服务器上去, 可以是Tomcat ，Rain 等等。
进入
结果如下：
Hello: Hello, world
Hello: snoopy
Hello: showme
说明服务器端已经编写成功。
创建客户端程序
创建一个名为HessianClient 的JAVAProject ，载入hessian.jar 包
创建与服务器端一样的接口，及基础类
public interface BasicAPI{
public void setGreeting(Stringgreeting);
public String hello();
public User getUser();
}
import java.io.Serializable;
public class User implements Serializable{
String userName ="snoopy";
String password ="showme";
public User(Stringuser, String pwd) {
this.userName =user;
this.password= pwd;
}
public StringgetUserName() {
returnuserName;
}
public StringgetPassword() {
returnpassword;
}
}
创建客户端程序
importcom.caucho.hessian.client.HessianProxyFactory;
public class BasicClient {
public static void main(String[] args)
throwsException
{
String url ="http://127.0.0.1:8080/Hessian/hello";
HessianProxyFactoryfactory = new HessianProxyFactory();
BasicAPIbasic = (BasicAPI) factory.create(BasicAPI.class, url);
System.out.println("Hello:" + basic.hello());
System.out.println("Hello:" + basic.getUser().getUserName());
System.out.println("Hello:" + basic.getUser().getPassword());
basic.setGreeting("HelloGreeting");
System.out.println("Hello:" + basic.hello());
}
}
运行结果：
Hello: Hello, world
Hello: prance
Hello: meshow
Hello: Hello Greeting