通用排序工具类

1,实际应用:

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

2,工具类sortList源码

    Java代码  
     
   
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:

    Java代码  
     
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:

    Java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:

    Java代码  
     
   
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*/;  
        }  
          
    }  

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