Spring 的 Hessian 简单使用
一、 服务器端配置
<?
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
>
remote
</
servlet-name
>
<
servlet-class
>
org.springframework.web.servlet.DispatcherServlet
</
servlet-class
>
<
load-on-startup
>
1
</
load-on-startup
>
</
servlet
>
<
servlet-mapping
>
<
servlet-name
>
remote
</
servlet-name
>
<
url-pattern
>
/remote/*
</
url-pattern
>
</
servlet-mapping
>
<
welcome-file-list
>
<
welcome-file
>
index.jsp
</
welcome-file
>
</
welcome-file-list
>
</
web-app
>
配置好
Servlet
和
servlet mapping
的
DispatcherServlet
然后再在
WEB-INF
下
创建
Spring
初始化
HessianService
配置，如下：
该文件名一定是：
那个
servlet
名
+
“
-servlet.xml
”
这里我们创建
”remote-servlet.xml”
文件，内容如下：
<?
xml
version
=
“1.0”
encoding
=
“GBK”
?>
<
beans
xmlns
=
“http://www.springframework.org/schema/beans”
xmlns:xsi
=
“http://www.w3.org/2001/XMLSchema-instance”
xmlns:aop
=
“http://www.springframework.org/schema/aop”
xmlns:tx
=
“http://www.springframework.org/schema/tx”
xsi:schemaLocation
=
“http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd”
>
<
bean
id
=
“timeService”
class
=
“com.sosee.TimeServiceImpl”
/>
<
bean
name
=
“/HessianService”
class
=
“org.springframework.remoting.caucho.HessianServiceExporter”
>
<
property
name
=
“service”
ref
=
“timeService”
/>
<
property
name
=
“serviceInterface”
value
=
“com.sosee.TimeService”
/>
</
bean
>
</
beans
>
2.创建接口和实现类
接口 ：
com.sosee.TimeService
package
com.sosee;
public
interface
TimeService{
String getTime();
}
实现类：
package
com.sosee;
import
java.text.SimpleDateFormat;
import
java.util.Date;
public class
TimeServiceImpl
implements
TimeService {
public
String getTime() {
return new
SimpleDateFormat(“yyyy-MM-dd HH:mm:ss”).format(new Date());
}
}
OK,以上将服务器端的所有准备工作都搞定了，接下来就是客户端如何调用了。
二、 客户端Spring配置以及代码调用
1. 配置Spring 容器
<?
xml
version
=
“1.0”
encoding
=
“GBK”
?>
<
beans
xmlns
=
“http://www.springframework.org/schema/beans”
xmlns:xsi
=
“http://www.w3.org/2001/XMLSchema-instance”
xmlns:aop
=
“http://www.springframework.org/schema/aop”
xmlns:tx
=
“http://www.springframework.org/schema/tx”
xsi:schemaLocation
=
“http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.0.xsd”
>
<
bean
name
=
“hessianService”
class
=
“org.springframework.remoting.caucho.HessianProxyFactoryBean”
>
<
property
name
=
“serviceUrl”
value
=
“http://localhost:8080/call/remote/HessianService”
/>
<
property
name
=
“serviceInterface”
value
=
“com.sosee.TimeService”
/>
</
bean
></
beans
>
2. 调用代码：
package
com.sosee;
import
org.springframework.context.ApplicationContext;
import
org.springframework.context.support.ClassPathXmlApplicationContext;
public
class
Main {
public
static
void
main(String[] args){
ApplicationContext context =
new
ClassPathXmlApplicationContext(
“applicationContext.xml”
);
TimeService service = (TimeService)context.getBean(
“hessianService”
);
System.
out
.println(
“get systime:”
+service.getTime()); }
}
OK，测试成功.
有可能你初次做这个测试的时候，有出现以下的异常情况：
Exception in thread “main”
org.springframework.remoting.RemoteAccessException
: Cannot access Hessian remote service at [http://localhost:8080/call2/remote/HessianService]; nested exception is
com.caucho.hessian.io.HessianProtocolException
: 400:
java.io.IOException
: Server returned HTTP response code: 400 for URL: http://localhost:8080/call2/remote/HessianService
at org.springframework.remoting.caucho.HessianClientInterceptor.convertHessianAccessException(
HessianClientInterceptor.java:254
)
at org.springframework.remoting.caucho.HessianClientInterceptor.invoke(
HessianClientInterceptor.java:225
)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(
ReflectiveMethodInvocation.java:171
)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(
JdkDynamicAopProxy.java:204
)
at $Proxy1.getTime(Unknown Source)
at com.sosee.Main.main(
Main.java:14
)
Caused by:
com.caucho.hessian.io.HessianProtocolException
: 400:
java.io.IOException
: Server returned HTTP response code: 400 for URL: http://localhost:8080/call2/remote/HessianService
at com.caucho.hessian.client.HessianProxy.invoke(
HessianProxy.java:185
)
这种异常一般都是由于 Spring配置文件中 的
<
property
name
=
“serviceUrl”
value
=
“http://localhost:8080/call/remote/HessianService”
/>
(
我这里配置的
call
是
webroot
的名称
,
你如果直接放到服务器的根目录，就不需要这个了；
remote/为servlet的定义规则
)
出现的问题，一定把URL写正确就OK了！
另外需要注意的就是spring.jar的版本问题了，Srping版本更新较快，我这个用的2.0.7版本。
原博客地址：http://blog.csdn.net/jakemanse/article/details/4218322