public class StateMachine {//持有一個(gè)狀態(tài)對(duì)象 private State state = null;//包含流程處理需要的業(yè)務(wù)數(shù)據(jù)對(duì)象，不知道具體類型,用Object，反正只是傳遞到具體的狀態(tài)對(duì)象里面 private Object businessVO = null;//執(zhí)行工作，客戶端處理流程的接口方法。 public void doWork(){//轉(zhuǎn)調(diào)相應(yīng)的狀態(tài)對(duì)象真正完成功能處理this.state.doWork(this);}public State getState() {return state;}public void setState(State state) {this.state = state;}public Object getBusinessVO() {return businessVO;}public void setBusinessVO(Object businessVO) {this.businessVO = businessVO;} }public class LeaveRequestContext extends StateMachine{//這里可以擴(kuò)展跟自己流程相關(guān)的處理 }public interface State {//執(zhí)行狀態(tài)對(duì)應(yīng)的功能處理 public void doWork(StateMachine ctx); }public interface LeaveRequestState extends State{//這里可以擴(kuò)展跟自己流程相關(guān)的處理 }public class DepManagerState implements LeaveRequestState{public void doWork(StateMachine request) {//先把業(yè)務(wù)對(duì)象造型回來(lái)LeaveRequestModel lrm = (LeaveRequestModel)request.getBusinessVO();//業(yè)務(wù)處理，把審核結(jié)果保存到數(shù)據(jù)庫(kù)中//部門經(jīng)理審核過后，直接轉(zhuǎn)向?qū)徍私Y(jié)束狀態(tài)了request.setState(new AuditOverState());//給申請(qǐng)人增加一個(gè)工作，讓他察看審核結(jié)果} }public class ProjectManagerState implements LeaveRequestState{public void doWork(StateMachine request) {//先把業(yè)務(wù)對(duì)象造型回來(lái)LeaveRequestModel lrm = (LeaveRequestModel)request.getBusinessVO();System.out.println("項(xiàng)目經(jīng)理審核中，請(qǐng)稍候......");//模擬用戶處理界面，通過控制臺(tái)來(lái)讀取數(shù)據(jù)System.out.println(lrm.getUser()+"申請(qǐng)從"+lrm.getBeginDate()+"開始請(qǐng)假"+lrm.getLeaveDays()+"天,請(qǐng)項(xiàng)目經(jīng)理審核(1為同意，2為不同意)：");//讀取從控制臺(tái)輸入的數(shù)據(jù)Scanner scanner = new Scanner(System.in);if(scanner.hasNext()){int a = scanner.nextInt();//設(shè)置回到上下文中String result = "不同意";if(a==1){result = "同意";}lrm.setResult("項(xiàng)目經(jīng)理審核結(jié)果："+result);//根據(jù)選擇的結(jié)果和條件來(lái)設(shè)置下一步if(a==1){if(lrm.getLeaveDays() > 3){//如果請(qǐng)假天數(shù)大于3天，而且項(xiàng)目經(jīng)理同意了，就提交給部門經(jīng)理request.setState(new DepManagerState());//繼續(xù)執(zhí)行下一步工作request.doWork();}else{//3天以內(nèi)的請(qǐng)假，由項(xiàng)目經(jīng)理做主,就不用提交給部門經(jīng)理了，轉(zhuǎn)向?qū)徍私Y(jié)束狀態(tài)request.setState(new AuditOverState());//繼續(xù)執(zhí)行下一步工作request.doWork();} }else{//項(xiàng)目經(jīng)理要是不同意的話，也就不用提交給部門經(jīng)理了，轉(zhuǎn)向?qū)徍私Y(jié)束狀態(tài)request.setState(new AuditOverState());//繼續(xù)執(zhí)行下一步工作request.doWork();} } } }

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