工具函数

清除指定目录

1. /**
2. *Recursivelydeleteswholecontentofthegivenfolder.
3. *@paramfolderfoldertobeemptied
4. *@return<code>true</code>ifgivenfolderbecomesemptyornotexists
5. */
6. publicstaticbooleanemptyFolder(finalFilefolder){
7. if(!folder.isDirectory()){
8. returntrue;
9. }
10. File[]files=folder.listFiles();
11. booleanresult=true;
12. for(Filefile:files)
13. {
14. if(file.isDirectory()){
15. if(emptyFolder(file)){
16. result&=file.delete();
17. }else{
18. result=false;
19. }
20. }else{
21. result&=file.delete();
22. }
23. }
24. returnresult;
25. }

通过类名创建一个实例

1. protectedObjectcreateClassInstance(finalStringclassName)
2. throwsInstantiationException,IllegalAccessException,
3. ClassNotFoundException{
4. ClassLoadercl=Thread.currentThread().getContextClassLoader();
5. if(cl!=null){
6. try{
7. returncl.loadClass(className).newInstance();
8. }catch(ClassNotFoundExceptioncnfe){
9. //ignore
10. }
11. }
12. cl=getClass().getClassLoader();
13. if(cl!=null){
14. try{
15. returncl.loadClass(className).newInstance();
16. }catch(ClassNotFoundExceptioncnfe){
17. //ignore
18. }
19. }
20. returnClassLoader.getSystemClassLoader().loadClass(
21. className).newInstance();
22. }