packageutil;importjava.lang.reflect.Field;importjava.util.Comparator;
@SuppressWarnings(“rawtypes”)public class ComparatorUtil implementsComparator{//要排序的属性名
privateString name;//是否升序
private boolean falg = true;/***@paramname 要排序的属性名,如果是基本类型的排序，请入null值
*@paramfalg false/true : 升序/降序*/
public ComparatorUtil(String name, booleanfalg) {super();this.name =name;this.falg =falg;
}
@Overridepublic intcompare(Object o1, Object o2) {int result = 0;//入参为空|参数类型不相等，都不进行处理。
if(o1 == null || o2 == null || !o1.getClass().getName().equals(o2.getClass().getName())){returnresult;
}//7大基本类型的处理(boolean除外.且把Collections.reverse()/Collections.sort()的事也做了)
if(isBaseType(o1)){//比较
returnbaseTypeOpt(o1,o2);
}try{
Field f1=o1.getClass().getDeclaredField(name);
Field f2=o2.getClass().getDeclaredField(name);//设置private可读
f1.setAccessible(true);
f2.setAccessible(true);
result=baseTypeOpt(f1.get(o1),f2.get(o2));
}catch (Exception e) { //异常懒得处理了,如果没有对应的属性,那就不排序了.(手动滑稽)
e.printStackTrace();
}returnresult;
}private intbaseTypeOpt(Object o1, Object o2) {int result = 0;if(o1 instanceofString){
result=o1.toString().compareTo(o2.toString());
}else if(o1 instanceofInteger){
result= ((Integer)o1) -((Integer)o2);
}else if(o1 instanceofDouble){if(((Double)o1 – (Double)o2) > 0){
result= 1;
}else if(((Double)o1 – (Double)o2) < 0){
result= -1;
}
}else if(o1 instanceofFloat){if(((Float)o1 – (Float)o2) > 0){
result= 1;
}else if(((Float)o1 – (Float)o2) < 0){
result= -1;
}
}else if(o1 instanceofCharacter){
result=((Character)o1).compareTo(((Character)o2));
}else if(o1 instanceofShort){
result= ((Short)o1) -((Short)o2);
}else if(o1 instanceofLong){if(((Long)o1 – (Long)o2) > 0){
result= 1;
}else if(((Long)o1 – (Long)o2) < 0){
result= -1;
}
}//降序
if(isFalg()){
result= -result;
}returnresult;
}private booleanisBaseType(Object o) {if((o instanceof String) || (o instanceofInteger)|| (o instanceof Double) || (o instanceofFloat)|| (o instanceof Character) || (o instanceofShort)|| (o instanceofLong)){return true;
}return false;
}publicString getName() {returnname;
}public voidsetName(String name) {this.name =name;
}public booleanisFalg() {returnfalg;
}public void setFalg(booleanfalg) {this.falg =falg;
}
}