关于java的BigDecimal类型经Hessian发布出现Bug的示例

我用的Hessian是Hessian 4.0.7版本
我们用它与spring集成
以下是web.xml内容

<?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">

	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>/WEB-INF/classes/*-context.xml</param-value>
	</context-param>

	<listener>  
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
    </listener>

	<servlet>
		<servlet-name>remoting</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>  
            <param-name>contextConfigLocation</param-name>  
            <param-value>/WEB-INF/classes/*-remote.xml</param-value>  
        </init-param> 
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>remoting</servlet-name>
		<url-pattern>/remoting/*</url-pattern>
	</servlet-mapping>

  	<welcome-file-list>
    	<welcome-file>index.jsp</welcome-file>
  	</welcome-file-list>
</web-app>

以下是Hessian发布配置（common-remote.xml）：

<?xml version="1.0" encoding="gb2312"?>

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://www.springframework.org/schema/beans
                 http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
	<!-- 
		此文件定义上下文内容，各模块需各自按以下指定的文件名在各模块的src文件夹下维护、管理上下文内容。
		此文件只作管理用途，不允许随意修改！
	-->
    <bean name="/remoteLoginService" class="org.springframework.remoting.caucho.HessianServiceExporter"> 
    	<property name="service" ref="fap.loginService"/> 
        <property name="serviceInterface" value="grp.pt.common.ILoginService"/> 
    </bean>

    <!-- 用户管理 -->
    <bean name="/remoteUserService" class="org.springframework.remoting.caucho.HessianServiceExporter"> 
    	<property name="service" ref="fap.userService"/> 
        <property name="serviceInterface" value="grp.pt.common.IUserService"/> 
    </bean>  

    <bean name="/remoteTest" class="org.springframework.remoting.caucho.HessianServiceExporter"> 
    	<property name="service" ref="testbean"/> 
        <property name="serviceInterface" value="grp.pt.common.ITestService"/> 
    </bean> 

</beans>

bean的定义我们只关注我们的测试类（common-context.xml）：

<bean id="testbean" class="grp.pt.common.bs.TestService"></bean>

接口的定义：

package grp.pt.common;

import java.math.BigDecimal;

public interface ITestService {

	public BigDecimal testBig();

	public float testfloat();

	public double testdouble();

}

接口实现类的定义：

package grp.pt.common.bs;

import grp.pt.common.ITestService;

import java.math.BigDecimal;

public class TestService implements ITestService {

	public BigDecimal testBig() {
		BigDecimal big=new BigDecimal( "10.90944" );
		System.out.println("服务端："+big);
		return big;
	}
	public double testdouble(){
		return 10.123d;
	}

	public float testfloat(){
		return 10.123f;
	}
}

测试代码：

public static void main(String[] args) throws Exception {
		 String url = "http://localhost:8080/realware/remoting/remoteTest";
		 HessianProxyFactory factory = new HessianProxyFactory();
		 ITestService test = (ITestService) factory.create(ITestService.class,url);
		 BigDecimal bi=test.testBig();
		 System.out.println(test.testdouble());
		 System.out.println(test.testfloat());
		 System.out.println(new BigDecimal(bi.toString()));
		 BigDecimal big=new BigDecimal("10.123");
		 System.out.println(big.toString());
	}

最后服务发布后，测试结果为：

10.123
10.123
0.00000
10.123

服务器打印：

服务端：10.90944

我们可以看到Hessian对于BigDemical类型的序列化后的传输是个大bug，它保留了它的精度，但数值全是0.