通用排序工具类

1,实际应用:

List<OrderInfoBean> orderInfoBeans = commitOrderDto.getValue();
		SortList<OrderInfoBean> sortList = new SortList<OrderInfoBean>();
		sortList.Sort(orderInfoBeans, "getCreateTime", "desc");

 

2,工具类sortList源码

package com.gov.util;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

/***
 * 用户排序
 * @author huangwei
 * 2015年7月1日
 * @param <E>
 */
public class SortList<E> {
    public void Sort(List<E> list, final String method, final String sort) {
        Collections.sort(list, new Comparator() {
            public int compare(Object a, Object b) {
                int ret = 0;
                try {
                    Method m1 = ((E) a).getClass().getMethod(method, null);
                    Method m2 = ((E) b).getClass().getMethod(method, null);
                    if (sort != null && "desc".equals(sort))// 倒序
                        ret = m2.invoke(((E) b), null).toString()
                                .compareTo(m1.invoke(((E) a), null).toString());
                    else
                        // 正序
                        ret = m1.invoke(((E) a), null).toString()
                                .compareTo(m2.invoke(((E) b), null).toString());
                } catch (NoSuchMethodException ne) {
                    System.out.println(ne);
                } catch (IllegalAccessException ie) {
                    System.out.println(ie);
                } catch (InvocationTargetException it) {
                    System.out.println(it);
                }
                return ret;
            }
        });
    }
}

 

另外一种排序方式

实例:

List<CommonDictionary>list= DictionaryParam.getList("ptype");
			
		Collections.sort(list,new SystemHWUtil. ListComparator(true,"value"));
		model.addAttribute("commonDictionaries", list);

 说明:list的类型是ArrayList;

按照list中的元素(CommonDictionary对象)的成员变量value进行排序

SystemHWUtil. ListComparator的源代码:

public static class ListComparator implements Comparator{
		/***
		 * 是否转化为Int之后再比较
		 */
		private boolean isConvertInteger;
		/***
		 * 对哪个列进行排序
		 */
		private String comparedProperty;
		public ListComparator(boolean isConvertInteger,String comparedProperty) {
			super();
			this.isConvertInteger = isConvertInteger;
			this.comparedProperty=comparedProperty;
		}
		public int compare(Object o1, Object o2) {
			if(null!=o1&&null!=o2)
			{
				try {
					Object obj1=ReflectHWUtils.getObjectValue(o1, comparedProperty);
					Object obj2=ReflectHWUtils.getObjectValue(o2, comparedProperty);
					if(isConvertInteger){
						int num1;
						int num2;
						if(obj1 instanceof Integer){
							num1=(Integer)obj1;
							num2=(Integer)obj2;
						}else{
							num1=Integer.parseInt(obj1.toString());
							num2=Integer.parseInt(obj2.toString());
						}
						if(num1>num2){
							return 1;
						}else if(num1<num2){
							return -1;
						}else{
							return 0;
						}
					}else{
						return obj1.toString().compareTo(obj2.toString());
					}
				} catch (SecurityException e) {
					e.printStackTrace();
				} catch (NoSuchFieldException e) {
					e.printStackTrace();
				} catch (IllegalArgumentException e) {
					e.printStackTrace();
				} catch (IllegalAccessException e) {
					e.printStackTrace();
				}
			}
			return 0/*等于*/;
		}
	}

 

附录:

public static class ArrayListComparator implements Comparator{
		/***
		 * 排序的依据
		 */
		private String titles[];
		/***
		 * 对哪个列进行排序
		 */
		private String comparedProperty;
		
		public ArrayListComparator(String[] titles,String comparedProperty) {
			super();
			this.titles = titles;
			this.comparedProperty=comparedProperty;
		}

		public int compare(Object o1, Object o2) {
			if(null!=o1&&null!=o2)
			{
				
				try {
					if(SystemHWUtil.indexOfArr(titles,(String)ReflectHWUtils.getObjectValue(o1, comparedProperty)   ) >
					SystemHWUtil.indexOfArr(titles,(String)ReflectHWUtils.getObjectValue(o2, comparedProperty))){
						return 1/*大于*/;
					}else {
						return -1/*小于*/;
					}
				} catch (SecurityException e) {
					e.printStackTrace();
				} catch (NoSuchFieldException e) {
					e.printStackTrace();
				} catch (IllegalArgumentException e) {
					e.printStackTrace();
				} catch (IllegalAccessException e) {
					e.printStackTrace();
				}
			}
			return 0/*等于*/;
		}
		
	}

 

 

 

 

评论

1 楼 hw1287789687 2015-10-11  

参考:
http://www.cnblogs.com/huangwei520/p/4868934.html