sistema de gestión curricular
Para desarrollar el uso de Servicio-Dao
- estructura de paquete de la figura
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categoría del dominio incluye la lección
public class Lesson { private String LensonName; private String LessonLoc; private String LessonTime; public Lesson(){ } public Lesson(String LN,String LL,String LT){ this.LensonName = LN; this.LessonLoc = LL; this.LessonTime = LT; } public String getLensonName() { return LensonName; } public void setLensonName(String lensonName) { LensonName = lensonName; } public String getLessonLoc() { return LessonLoc; } public void setLessonLoc(String lessonLoc) { LessonLoc = lessonLoc; } public String getLessonTime() { return LessonTime; } public void setLessonTime(String lessonTime) { LessonTime = lessonTime; } @Override public String toString(){ return LensonName+","+LessonLoc+","+LessonTime; } } -
servicio incluye LessonService y LessonServiceImpl
public interface LessonService { public Lesson findLessonByName(String name); public boolean addLesson(Lesson l); public boolean delLessonByName(String name); public boolean updateLesson(Lesson pre_lesson,Lesson l); public void showAllLesson(); public void update(); } public class LessonServiceImpl implements LessonService{ private LessonDao ld; public LessonServiceImpl(){ ld = new LessonDaoImpl(); } @Override public Lesson findLessonByName(String name) { return ld.findLessonByName(name); } @Override public boolean addLesson(Lesson l) { return ld.addLesson(l); } @Override public boolean delLessonByName(String name) { return ld.delLessonByName(name); } @Override public boolean updateLesson(Lesson pre_lesson, Lesson l) { return ld.updateLesson(pre_lesson, l); } @Override public void showAllLesson() { ld.showAllLesson(); } @Override public void update() { ld.update(); } } -
capa de Dao
public interface LessonDao { public Lesson findLessonByName(String name); public boolean addLesson(Lesson l); public boolean delLessonByName(String name); public boolean updateLesson(Lesson pre_lesson,Lesson l); public void showAllLesson(); public void update(); } public class LessonDaoImpl implements LessonDao { private List<Lesson> ls; private File file; public LessonDaoImpl(){ ls = new ArrayList<Lesson>(); file = new File("lesson.txt"); init(); } private void init() { try{ BufferedReader br = new BufferedReader(new FileReader(file)); String tmp; while((tmp = br.readLine())!=null){ String[] s = tmp.split(","); ls.add(new Lesson(s[0], s[1], s[2])); } br.close(); }catch(Exception r){ r.printStackTrace(); } } @Override public Lesson findLessonByName(String name) { for(Lesson lesson: ls){ if(lesson.getLensonName().equals(name)) return lesson; } System.out.println("该节课不存在！"); return null; } @Override public boolean addLesson(Lesson l) { ls.add(l); System.out.println("添加成功!"); try{ BufferedWriter bw = new BufferedWriter(new FileWriter(file,true)); bw.write(l.toString()+"\n"); bw.close(); }catch(Exception e){ e.printStackTrace(); } return true; } @Override public boolean delLessonByName(String name) { for(int i = 0;i<ls.size();i++){ if(ls.get(i).getLensonName().equals(name)){ ls.remove(i); System.out.println("已删除！"); return true; } } System.out.println("未找到该用户！"); return false; } @Override public boolean updateLesson(Lesson pre_lesson, Lesson l) { Lesson tmp = findLessonByName(pre_lesson.getLensonName()); tmp.setLensonName(l.getLensonName()); tmp.setLessonLoc(l.getLessonLoc()); tmp.setLessonTime(l.getLessonTime()); System.out.println("删除成功！"); return true; } @Override public void showAllLesson() { FileUtil.ListSort(ls); for(Lesson l:ls){ System.out.println(l.toString()); } } @Override public void update() { try { file.delete(); file.createNewFile(); BufferedWriter bw = new BufferedWriter(new FileWriter(file,true)); for(int i = 0;i<ls.size();i++){ bw.write(ls.get(i).toString()+"\n"); } bw.close(); } catch (IOException e) { e.printStackTrace(); } } } -
clase FileUtil
public class FileUtil { public static void ListSort(List<Lesson> list) { Collections.sort(list, new Comparator<Lesson>() { @Override public int compare(Lesson o1, Lesson o2) { SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); try { Date dt1 = format.parse(o1.getLessonTime()); Date dt2 = format.parse(o2.getLessonTime()); if (dt1.getTime() > dt2.getTime()) { return 1; } else if (dt1.getTime() < dt2.getTime()) { return -1; } else { return 0; } } catch (Exception e) { e.printStackTrace(); } return 0; } }); } } -
clase de prueba
public class MainTest { public static void main(String[] args) { LessonService ls = new LessonServiceImpl(); int op = -1; Scanner s = new Scanner(System.in); while(op!=0){ System.out.println("课程表系统"); System.out.println("---------------------------------------"); System.out.println("1.添加新课程"); System.out.println("2.显示所有课程"); System.out.println("3.根据名称删除课程"); System.out.println("4.更新课程"); System.out.println("0.结束！"); System.out.println("---------------------------------------"); System.out.println("请选择序号："); op = s.nextInt(); if(op==1){ System.out.println("请输入课程名："); String name = s.next(); System.out.println("请输入教室："); String Loc = s.next(); System.out.println("请输入时间 yyyy-mm-dd："); String time = s.next(); Lesson tmp = new Lesson(name, Loc, time); ls.addLesson(tmp); }else if(op == 2){ ls.showAllLesson(); }else if(op == 3){ System.out.println("请输入要删除的课程名："); String name = s.next(); ls.delLessonByName(name); }else if(op == 4){ System.out.println("请输入要修改的课程名："); String pre_name = s.next(); Lesson pre_lesson = ls.findLessonByName(pre_name); System.out.println("请输入新的名称："); String new_name = s.next(); System.out.println("请输入新的地点："); String new_loc = s.next(); System.out.println("请输入新的时间："); String new_time = s.next(); Lesson new_lesson = new Lesson(new_name, new_loc, new_time); ls.updateLesson(pre_lesson, new_lesson); }else if(op == 0){ ls.update(); } } s.close(); } }