java caching system完整项目例子（包括用到的JAR包）

package cn; import java.util.ArrayList; import java.util.List; import org.apache.jcs.JCS; public class StuObjManager { private static StuObjManager instance; private static int checkedOut=0; public static JCS stuCache; private StuObjManager() { try { stuCache=JCS.getInstance("stuCache"); } catch(Exception e) { e.printStackTrace(); } } public static StuObjManager getInstance() { synchronized(StuObjManager.class) { if(instance==null) { instance=new StuObjManager(); } } synchronized(instance) { instance.checkedOut++; } return instance; } public Student getStu(int sno) { return getStu(sno,true); } public Student getStu(int sno,boolean a) { Student stu=null; if(a) { stu=(Student)stuCache.get("Stu"+sno); } if(stu==null) { stu=loadStu(sno); } return stu; } public Student loadStu(int sno) { Student stu=new Student(); stu.sno=sno; try { boolean found=false; found=true; if(found) { stuCache.put("Stu"+sno, stu); } } catch(Exception e) {System.out.println("又报错了!");} return stu; } public void storeStu(Student stu) { try { if(stu.sno!=0) { stuCache.remove("Stu"+stu.sno); } stuCache.put("Stu"+stu.sno, stu); } catch(Exception e) {} } public List<Student> getStuList(int sno) { return getStuList(sno,true); } public List<Student> getStuList(int sno,boolean a) { List<Student> stulist = null; // Student stu=null; if(a) { stulist=(List<Student>)stuCache.get("StuList"+sno);System.out.println(stulist.size()+" 从内存中取出数据！"); } // if(stu==null) // { // stu=loadStu(sno); // } return stulist; } public List<Student> loadStuList(List<Student> sts,int sno) { List<Student> stulist = sts; try { boolean found=false; found=true; if(found) { stuCache.put("StuList"+sno, stulist); } } catch(Exception e) {System.out.println("又报错了!");} return stulist; } public static void main(String [] args) { long last=System.currentTimeMillis(); StuObjManager stu=StuObjManager.getInstance(); // for(int i = 0; i < 2000; i++){ // stu.loadStu(i); // } // Student stu1=stu.getStu(8,true); // System.out.println(stu1.sno); // System.out.println("所需时间："+(System.currentTimeMillis()-last)); List<Student> stulist = new ArrayList<Student>(); for(int m=0;m<20;m++){ Student st = new Student(); st.sno=m; st.sname="STU"+m; stulist.add(st); } stu.loadStuList(stulist, 1); List<Student> stulistget = stu.getStuList(1); System.out.println(stulistget.size()); for(Student stt:stulistget){ System.out.println(stt.sname+" "+stt.sno); } } }