struts2 一个CRUD的BaseAction

在struts2 in action中所见，这样封装后省去了大部分crud反复代码。尽管还不能理悟。先记下来。

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);
		}
	}
}