为了测试需要（使用StrutsTestCase,jMock）调整旧的系统，大家给点意见

系统使用了Struts，在Action中调用业务层的类，准备更改结构便于使用StrutsTestcase,jmock,easymock等来写单元测试
调用关系如下：

AAction->BizA-->BizHelper
|
|--->BizB

public class AAction extends AuthBaseAction
{
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception
{
OutInfoListForm outForm = null;
String forwardKind = null;
AForm inForm = (AForm)form;

//call Bussiness logic
BizA bizA = new BizA();
outForm = bizControlA.searchInfo(inForm);
if(outForm == null){
throw new NullPointerException("aaa");
}
DispatchControl comnControl = new DispatchControl();
forwardKind = comnControl.getForwardKind(outForm);
return mapping.findForward(forwardKind);
}
}

bussiess class BizA

public class BizA {
public OutInfoListForm searchInfo(AForm inForm) throws Exception {
try{
OutInfoListForm outForm = new OutInfoListForm();
String receiveTelegram=null;
BizHelper bizHelper= new BizHelper();
receiveTelegram = bizHelper.formatMessage(inForm)

BizB bizB=new BizB();
outForm = bizB.sendMessage(receiveTelegram);
if(outForm.getError())
{
throw new MyException("aaaa");
}
}catch(exception e){
throw new MyException("aaaa");
}
return outForm
}
}

更改以后代码如下：
1,增加一个接口
InterfaceBizA，

public Interface InterfaceBizA{
public OutInfoListForm searchInfo(AForm inForm) throws Exception；
public void setBizHelper(BizHelper bizHelper)；
public void setBizB(BizB bizB);

}

public class BizA implement InterfaceBizA {
private BizHelper bizHelper;
private BizB bizB;

public void setBizHelper(BizHelper bizHelper){
this.bizHelper= bizHelper;
}

public void setBizB(BizB bizB){
this.bizB= bizB;
}

public OutInfoListForm searchInfo(AForm inForm) throws Exception {
try{
OutInfoListForm outForm = new OutInfoListForm();
String receiveTelegram=null;
receiveTelegram = bizHelper.formatMessage(inForm)

outForm = bizB.sendMessage(receiveTelegram);
if(outForm.getError())
{
throw new MyException("aaaa");
}
}catch(exception e){
throw new MyException("aaaa");
}
return outForm
}
}

更改以后使用jMock进行测试就可以进行了，比如在写单元测试，
测试BizA的时候可以使用jMock来隔离BizHelper类和BizB类调用带来的影响。

更改完毕以后感觉结构还是不太好，一旦业务中要调用很多的外部类，那要增加很多的
私有变量，而且在调用这个业务类前要做很多的调用setXXX的操作，不太方便。
大家给点建议。