struts2 一个CRUD的BaseAction

abstract class BaseAction extends ActionSupport {

protected DB db;
protected static Log log = LogFactory.getLog(BaseAction.class);
private long requestId;
private boolean readOnly = false;
private String mappedRequest;

@SkipValidation
public String show(){
setReadOnly(true);
setMappedRequest(Constants.LIST);
return SUCCESS;
}

@SkipValidation
public String add(){
setMappedRequest(Constants.SAVE);
return SUCCESS;
}

public String save(){
db.save(getModel());
return list();
}

@SkipValidation
public String edit(){
setMappingRequest(Constants.UPDATE);
return SUCCESS;
}

public String update(){
db.save(getModel());
return list();
}

@SkipValidation
public String destroy(){
setReadOnly(true);
setMappingRequest(Constants.REMOVE);
return Constants.SUCCESS;
}

public String remove(){
db.remove(getModel());
return list();
}

@SkipValidation
public String list(){
setMappingedRequest(Constants.LIST);
return Constants.LIST;
}

public String getActionClass(){
return getClass().getSimpleName();
}

public String getDestination(){
return getClass().getSimpleName();
}

public String getActionMethod(){
return mappedRequest;
}

public void setActionMethod(String method){
this.mappedRequest = method;
}

public void setMappedRequest(String actionMethed){
this.mappedRequest = getActionClass() + "_" + actionMethed;
log.debug("setting mappedRequest to "+ getActionClass() + "_" + actionMethed);
}

public void setReadOnly(boolean readOnly){
this.readOnly = readOnly;
log.debug("setting readOnly to "+readOnly);
}

public long getRequestId(){
return requestId;
}

public void setRequestId(long requestId){
this.requestId = requestId;
}

public void setDb(DB db){
this.db = db;
}

public boolean isReadOnly(){
return readOnly;
}

public abstract Object getModel();
}

public class MemberAction extends BaseAction implements ModelDriven,Preparable {

private Member model;

public Member getModel(){
return model;
}

public void prepare() throws Exception{
if(getRequestId() == 0){
model = new Member();
}else{
model = (Member) db.get(getRequestId);
}
}
}