Hessian 演示例子
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
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。C#中引用hessianCSharp.dll
·具有和服务器端结构一样的接口。包括命名空间都最好一样
·利用HessianProxyFactory调用远程接口。
一、服务器（service）
1、实体类
1
public
class
CarDO implements java.io.Serializable{
2
3 /* *
4 * 一定要实现Serializable因为要远程传输
5 */
6 private static final long serialVersionUID = 1L ;
7
8 String color;
9
10 String length;
11
12 String name;
13
14 public String getColor() {
15 return this .color;
16 }
17 public void setColor(String color) {
18 this .color = color;
19 }
20 public String getLength() {
21 return this .length;
22 }
23 public void setLength(String length) {
24 this .length = length;
25 }
26 public String getName() {
27 return this .name;
28 }
29 public void setName(String name) {
30 this .name = name;
31 }
2
3 /* *
4 * 一定要实现Serializable因为要远程传输
5 */
6 private static final long serialVersionUID = 1L ;
7
8 String color;
9
10 String length;
11
12 String name;
13
14 public String getColor() {
15 return this .color;
16 }
17 public void setColor(String color) {
18 this .color = color;
19 }
20 public String getLength() {
21 return this .length;
22 }
23 public void setLength(String length) {
24 this .length = length;
25 }
26 public String getName() {
27 return this .name;
28 }
29 public void setName(String name) {
30 this .name = name;
31 }
2、接口类
1
2 import com.hessian.server.javabean.CarDO;
3 /* *
4 * @author sunney
5 *
6 */
7 public interface IHello {
8
9 /* *
10 * 返回字符串
11 * @return
12 */
13 String sayHello();
14
15 /* *
16 * 返回一个实体
17 * @param carDO
18 * @return
19 */
20 CarDO searchCarInfo(CarDO carDO);
21 }
22
2 import com.hessian.server.javabean.CarDO;
3 /* *
4 * @author sunney
5 *
6 */
7 public interface IHello {
8
9 /* *
10 * 返回字符串
11 * @return
12 */
13 String sayHello();
14
15 /* *
16 * 返回一个实体
17 * @param carDO
18 * @return
19 */
20 CarDO searchCarInfo(CarDO carDO);
21 }
22
3、实现类
1
2 import com.caucho.hessian.server.HessianServlet;
3 import com.hessian.server.IHello;
4 import com.hessian.server.javabean.CarDO;
5
6 public class Hello extends HessianServlet implements IHello{
7 /**
8 *
9 */
10 private static final long serialVersionUID = 1L ;
11
12 public String sayHello(){
13 return " Hello world,zoomhoo again! " ;
14 }
15
16 public CarDO searchCarInfo(CarDO carDO) {
17 System.out.println( " server Color: " + carDO.getColor());
18 System.out.println( " server Name: " + carDO.getName());
19 System.out.println( " server Length: " + carDO.getLength());
20 carDO.setColor( " blue " );
21 carDO.setName( " baoma " );
22 carDO.setLength( " 1000000 " );
23 return carDO;
24 }
25
26
27 }
2 import com.caucho.hessian.server.HessianServlet;
3 import com.hessian.server.IHello;
4 import com.hessian.server.javabean.CarDO;
5
6 public class Hello extends HessianServlet implements IHello{
7 /**
8 *
9 */
10 private static final long serialVersionUID = 1L ;
11
12 public String sayHello(){
13 return " Hello world,zoomhoo again! " ;
14 }
15
16 public CarDO searchCarInfo(CarDO carDO) {
17 System.out.println( " server Color: " + carDO.getColor());
18 System.out.println( " server Name: " + carDO.getName());
19 System.out.println( " server Length: " + carDO.getLength());
20 carDO.setColor( " blue " );
21 carDO.setName( " baoma " );
22 carDO.setLength( " 1000000 " );
23 return carDO;
24 }
25
26
27 }
4、web.xml
1 <?xml version="1.0" encoding="ISO-8859-1"?>
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/remoting-servlet.xml </ param-value >
10 </ context-param >
11
12 < listener >
13 < listener-class >
14 org.springframework.web.context.ContextLoaderListener </ listener-class >
15 </ listener >
16
17 < servlet >
18 < servlet-name > remoting </ servlet-name >
19
20 < servlet-class >
21 org.springframework.web.servlet.DispatcherServlet </ servlet-class >
22 < load-on-startup > 1 </ load-on-startup >
23 </ servlet >
24
25 < servlet-mapping >
26 < servlet-name > remoting </ servlet-name >
27 < url-pattern > /remoting/* </ url-pattern >
28 </ servlet-mapping >
29
30 < servlet >
31 < servlet-name > Hello </ servlet-name >
32 < servlet-class > com.caucho.hessian.server.HessianServlet </ servlet-class >
33 < init-param >
34 < param-name > home-class </ param-name >
35 < param-value > com.hessian.server.impl.Hello </ param-value >
36 </ init-param >
37 < init-param >
38 < param-name > home-api </ param-name >
39 < param-value > com.hessian.server.IHello </ param-value >
40 </ init-param >
41 < load-on-startup > 1 </ load-on-startup >
42 </ servlet >
43 < servlet-mapping >
44 < servlet-name > Hello </ servlet-name >
45 < url-pattern > /Hello </ url-pattern >
46 </ servlet-mapping >
47 </ web-app >
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/remoting-servlet.xml </ param-value >
10 </ context-param >
11
12 < listener >
13 < listener-class >
14 org.springframework.web.context.ContextLoaderListener </ listener-class >
15 </ listener >
16
17 < servlet >
18 < servlet-name > remoting </ servlet-name >
19
20 < servlet-class >
21 org.springframework.web.servlet.DispatcherServlet </ servlet-class >
22 < load-on-startup > 1 </ load-on-startup >
23 </ servlet >
24
25 < servlet-mapping >
26 < servlet-name > remoting </ servlet-name >
27 < url-pattern > /remoting/* </ url-pattern >
28 </ servlet-mapping >
29
30 < servlet >
31 < servlet-name > Hello </ servlet-name >
32 < servlet-class > com.caucho.hessian.server.HessianServlet </ servlet-class >
33 < init-param >
34 < param-name > home-class </ param-name >
35 < param-value > com.hessian.server.impl.Hello </ param-value >
36 </ init-param >
37 < init-param >
38 < param-name > home-api </ param-name >
39 < param-value > com.hessian.server.IHello </ param-value >
40 </ init-param >
41 < load-on-startup > 1 </ load-on-startup >
42 </ servlet >
43 < servlet-mapping >
44 < servlet-name > Hello </ servlet-name >
45 < url-pattern > /Hello </ url-pattern >
46 </ servlet-mapping >
47 </ web-app >
5、remoting-servlet.xml
1
<?
xml version="1.0" encoding="UTF-8"
?>
2 <! DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
3 "http://www.springframework.org/dtd/spring-beans.dtd" >
4 < beans >
5 <!-- 定义普通bean实例 -->
6 < bean id ="hello" class ="com.hessian.server.impl.Hello" />
7 <!-- 使用HessianServiceExporter 将普通bean导出成Hessian服务 -->
8 < bean name ="/HessianRemoting"
9 class ="org.springframework.remoting.caucho.HessianServiceExporter" >
10 <!-- 需要导出的目标bean -->
11 < property name ="service" ref ="hello" />
12 <!-- Hessian服务的接口 -->
13 < property name ="serviceInterface" value ="com.hessian.server.IHello" />
14 </ bean >
15 </ beans >
2 <! DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
3 "http://www.springframework.org/dtd/spring-beans.dtd" >
4 < beans >
5 <!-- 定义普通bean实例 -->
6 < bean id ="hello" class ="com.hessian.server.impl.Hello" />
7 <!-- 使用HessianServiceExporter 将普通bean导出成Hessian服务 -->
8 < bean name ="/HessianRemoting"
9 class ="org.springframework.remoting.caucho.HessianServiceExporter" >
10 <!-- 需要导出的目标bean -->
11 < property name ="service" ref ="hello" />
12 <!-- Hessian服务的接口 -->
13 < property name ="serviceInterface" value ="com.hessian.server.IHello" />
14 </ bean >
15 </ beans >
二、客户端（clent）
1、客户端也要有对应该的实体类，最好包的路径要一样。如： com.hessian.server.javabean.CarDO
以上存在不在贴代码。
2、接口
1
import
com.hessian.server.javabean.CarDO;
2 /**
3 * @author
4 *
5 */
6 public interface IHello {
7 String sayHello();
8 CarDO searchCarInfo(CarDO carDO);
9 }
2 /**
3 * @author
4 *
5 */
6 public interface IHello {
7 String sayHello();
8 CarDO searchCarInfo(CarDO carDO);
9 }
3、实现类
1
2 package com.hessian.client;
3
4 import java.net.MalformedURLException;
5
6 import com.caucho.hessian.client.HessianConnectionException;
7 import com.caucho.hessian.client.HessianProxyFactory;
8 import com.hessian.server.IHello;
9 import com.hessian.server.javabean.CarDO;
10
11 /**
12 * @author
13 *
14 */
15 public class simpleTest {
16
17 /**
18 * @param args
19 */
20 public static void main(String[] args) {
21 // String url = " http://192.168.1.10 :8080/hessiantest/Hello";
22 String url = " http://localhost:8080/hessian-server/Hello " ;
23 HessianProxyFactory factory = new HessianProxyFactory();
24 try</sp
2 package com.hessian.client;
3
4 import java.net.MalformedURLException;
5
6 import com.caucho.hessian.client.HessianConnectionException;
7 import com.caucho.hessian.client.HessianProxyFactory;
8 import com.hessian.server.IHello;
9 import com.hessian.server.javabean.CarDO;
10
11 /**
12 * @author
13 *
14 */
15 public class simpleTest {
16
17 /**
18 * @param args
19 */
20 public static void main(String[] args) {
21 // String url = " http://192.168.1.10 :8080/hessiantest/Hello";
22 String url = " http://localhost:8080/hessian-server/Hello " ;
23 HessianProxyFactory factory = new HessianProxyFactory();
24 try</sp
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