十五分钟学会用Hessian

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了解Hessian

Hessian是远程调用的一种技术，和WebService类似，但不同的是较WebService而言，它更轻量级，更简单，更快速。关于Hessian更详细全面的介绍可以查看http://hessian.caucho.com/。下面可以花十五分钟的时间，学会怎么简单的使用Hessian。

使用Hessian

在Eclipse建立一个Maven webapp项目：
右键项目添加Hessian的依赖：
Maven随后会去中央仓库下载Hessian相关的jar包。
添加一个提供Hessian服务的接口：
1: /**
2: * @ClassName: HessianService
3: * @Description: Hessian服务接口
4: * @author liping.action@gmail.com
5: * @date 2014-1-3 下午10:41:26
6: *
7: */
8: public interface HessianService {
9: public String sayHello(String name);
10: }
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
以及现实类：
1: public class HessianServiceImpl implements HessianService {
2: /*
3: * (non-Javadoc)
4: *
5: * @see
6: * com.cnblogs.leefreeman.hessian.service.HessianService#sayHello(java.lang
7: * .String)
8: */
9: @Override
10: public String sayHello(String name) {
11: // TODO Auto-generated method stub
12: return "hello " + name;
13: }
14: }
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }
最后在web.xml中增加hessian相应的配置：
1: <servlet>
2: <servlet-name>service</servlet-name>
3: <servlet-class>com.caucho.hessian.server.HessianServlet</servlet-class>
4: <load-on-startup>1</load-on-startup>
5: <init-param>
6: <param-name>service-class</param-name>
7: <param-value>com.cnblogs.leefreeman.hessian.service.impl.HessianServiceImpl</param-value>
8: </init-param>
9: </servlet>
10: <servlet-mapping>
11: <servlet-name>service</servlet-name>
12: <url-pattern>/service</url-pattern>
13: </servlet-mapping>
.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }

现在Hessian服务端就算完成，是不是觉得很简单。启动项目：

打开该页面说明Hessian服务端启动正常。接口下来编写客户端测试用例:

1: public class HessianServiceTest {

2: private final static String SERVICE_URL = "http://localhost:8080/hessian-project/service";

4: @Test

5: public void testSayHello() {

6: HessianProxyFactory proxyFactory = new HessianProxyFactory();

7: try {

8: HessianService hessianService = (HessianService) proxyFactory

9: .create(HessianService.class, SERVICE_URL);

10: System.out.println(hessianService.sayHello("liping"));

11: } catch (MalformedURLException e) {

12: e.printStackTrace();

13: }

14: }

15: }

.csharpcode, .csharpcode pre
{
font-size: small;
color: black;
font-family: consolas, "Courier New", courier, monospace;
background-color: #ffffff;
/*white-space: pre;*/
}
.csharpcode pre { margin: 0em; }
.csharpcode .rem { color: #008000; }
.csharpcode .kwrd { color: #0000ff; }
.csharpcode .str { color: #006080; }
.csharpcode .op { color: #0000c0; }
.csharpcode .preproc { color: #cc6633; }
.csharpcode .asp { background-color: #ffff00; }
.csharpcode .html { color: #800000; }
.csharpcode .attr { color: #ff0000; }
.csharpcode .alt
{
background-color: #f4f4f4;
width: 100%;
margin: 0em;
}
.csharpcode .lnum { color: #606060; }结果：