问题描述
1.把Strings转换成int和把int转换成StringStringa=String.valueOf(2);//integertonumericstringinti=Integer.parseInt(a);//numericstringtoanintStringa=String.valueOf(2);//integertonumericstringinti=Integer.parseInt(a);//numericstringtoanint2.向javajavajavajavajdbcoracleoraclejdbcoraclejdbcoracleoraclejdbcoraclejdbcoraclejdbcoraclejdbcoracleoraclejdbcoraclejdbcjavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajavajava文件中添加文本Updated:ThanksSimoneforpointingtoexception.Ihavechangedthecode.BufferedWriterut=null;try{out=newBufferedWriter(newFileWriter(”filename”,true));out.write(”aString”);}catch(IOExceptione){//errorprocessingcode}finally{if(out!=null){out.close();}}BufferedWriterut=null;try{out=newBufferedWriter(newFileWriter(”filename”,true));out.write(”aString”);}catch(IOExceptione){//errorprocessingcode}finally{if(out!=null){out.close();}}3.获取现在正调用的方法名StringmethodName=Thread.currentThread().getStackTrace()[1].getMethodName();StringmethodName=Thread.currentThread().getStackTrace()[1].getMethodName();4.在中将String型转换成Date型javajavajavajava.util.Date=.text.DateFormat.getDateInstance().parse(dateString);.util.Date=.text.DateFormat.getDateInstance().parse(dateString);orSimpleDateFormatformat=newSimpleDateFormat("dd.MM.yyyy");Datedate=format.parse(myString);SimpleDateFormatformat=newSimpleDateFormat("dd.MM.yyyy");Datedate=format.parse(myString);5.通过链接数据库publicclassTest{StringdriverClass="..driver.Driver";Connectioncon;publicvoidinit(FileInputStreamfs)throwsClassNotFoundException,SQLException,FileNotFoundException,IOException{Propertiesprops=newProperties();props.load(fs);Stringurl=props.getProperty("db.url");StringuserName=props.getProperty("db.user");Stringpassword=props.getProperty("db.password");Class.forName(driverClass);con=DriverManager.getConnection(url,userName,password);}publicvoidfetch()throwsSQLException,IOException{PreparedStatementps=con.prepareStatement("selectSYSDATEfromdual");ResultSetrs=ps.executeQuery();while(rs.next()){//dothethingyoudo}rs.close();ps.close();}publicstaticvoidmain(String[]args){Testtest=newTest();test.init();test.fetch();}}publicclassTest{StringdriverClass="..driver.Driver";Connectioncon;publicvoidinit(FileInputStreamfs)throwsClassNotFoundException,SQLException,FileNotFoundException,IOException{Propertiesprops=newProperties();props.load(fs);Stringurl=props.getProperty("db.url");StringuserName=props.getProperty("db.user");Stringpassword=props.getProperty("db.password");Class.forName(driverClass);con=DriverManager.getConnection(url,userName,password);}publicvoidfetch()throwsSQLException,IOException{PreparedStatementps=con.prepareStatement("selectSYSDATEfromdual");ResultSetrs=ps.executeQuery();while(rs.next()){//dothethingyoudo}rs.close();ps.close();}publicstaticvoidmain(String[]args){Testtest=newTest();test.init();test.fetch();}}6.将中的util.Date转换成sql.Date这一片段显示如何将一个utilDate转换成sqlDate用于数据库javajavajavajavajavajavajavajava.util.DateutilDate=new.util.Date();.sql.DatesqlDate=new.sql.Date(utilDate.getTime());.util.DateutilDate=new.util.Date();.sql.DatesqlDate=new.sql.Date(utilDate.getTime());7.使用NIO快速复制文件publicstaticvoidfileCopy(Filein,Fileout)throwsIOException{FileChannelinChannel=newFileInputStream(in).getChannel();FileChannelutChannel=newFileOutputStream(out).getChannel();try{//inChannel.transferTo(0,inChannel.size(),outChannel);//original--apparentlyhastroublecopyinglargefilesonWindows//magicnumberforWindows,64Mb-32Kb)intmaxCount=(64*1024*1024)-(32*1024);longsize=inChannel.size();longposition=0;while(position<size){ position+=inChannel.transferTo(position,maxCount,outChannel);}}finally{if(inChannel!=null){ inChannel.close();}if(outChannel!=null){ outChannel.close();}}}publicstaticvoidfileCopy(Filein,Fileout)throwsIOException{FileChannelinChannel=newFileInputStream(in).getChannel();FileChannelutChannel=newFileOutputStream(out).getChannel();try{//inChannel.transferTo(0,inChannel.size(),outChannel);//original--apparentlyhastroublecopyinglargefilesonWindows//magicnumberforWindows,64Mb-32Kb)intmaxCount=(64*1024*1024)-(32*1024);longsize=inChannel.size();longposition=0;while(position<size){position+=inChannel.transferTo(position,maxCount,outChannel);}}finally{if(inChannel!=null){inChannel.close();}if(outChannel!=null){outChannel.close();}}}8.帖子内容太多不让发大家可以去这里参考吧http://www.gjrencai.com/newsShow.asp?dataID=684
解决方案
解决方案二：
很基础。不过还是有些作用。建议以后排版下吧
解决方案三：
该回复于2011-03-07 09:02:25被版主删除
解决方案四：
恩分享的精神很好啊就是这最后一句像广告...