保留后两位

int  recordsize=1024*102481024;

String recordstrsize="";

if(recordsize>1024*1024){

recordstrsize=new java.text.DecimalFormat("#.00").format(recordsize/1024/1024)+" MB";

}else{

recordstrsize=new java.text.DecimalFormat("#.00").format(recordsize/1024)+" KB";

}