通用的自定義排序類

public class SortList<E>{

        public int compareMap(Object a, Object b, final String method,final String type, final String sort){
            long ret = 0;
                try {
                Method m1 = ((E)a).getClass().getMethod(method, null);
                Method m2 = ((E)b).getClass().getMethod(method, null);
                switch(type){
                case "String":
                    if(sort != null && "desc".equals(sort)){//倒序
                    ret = String.valueOf(m2.invoke(((E)b), null)).compareTo(String.valueOf(m1.invoke(((E)a), null)));
                    }else{
                        ret = String.valueOf(m1.invoke(((E)a), null)).compareTo(String.valueOf(m2.invoke(((E)b), null)));
                    }
                    break;
                case "Date":
                    if(sort != null && "desc".equals(sort)){//倒序
                        ret = ((Date)(m2.invoke(((E)b), null))).getTime()-((Date)(m1.invoke(((E)a), null))).getTime();
                        }else{
                            ret = ((Date)(m1.invoke(((E)a), null))).getTime()-((Date)(m2.invoke(((E)b), null))).getTime();

                        }
                    break;
                case "Integer":
                    if(sort != null && "desc".equals(sort)){//倒序
                        ret = toInt(String.valueOf(m2.invoke(((E)b), null))).compareTo(toInt(String.valueOf(m1.invoke(((E)a), null))));
                        }else{
                            ret = toInt(String.valueOf(m1.invoke(((E)a), null))).compareTo(toInt(String.valueOf(m2.invoke(((E)b), null))));
                        }
                    break;
                default:
                        if(sort != null && "desc".equals(sort)){//倒序
                            ret = String.valueOf(m2.invoke(((E)b), null)).compareTo(String.valueOf(m1.invoke(((E)a), null)));
                            }else{
                                ret = String.valueOf(m1.invoke(((E)a), null)).compareTo(String.valueOf(m2.invoke(((E)b), null)));
                            }
                        break;
                }
                } catch (Exception e) {
                    // TODO 自動生成的 catch 塊
                    e.printStackTrace();
                } 
            return (int)ret;
        }
        /**
         * map 先放的條件優先
         * @param list
         * @param sortMap
         * @param sort
         */
        public void SortMuitled(List<E> list, final LinkedHashMap<String,String> sortMap, final String sort){
            Collections.sort(list, new Comparator() {
              public int compare(Object a, Object b) {
                long ret = 0;
                try{
                      for(String key:sortMap.keySet()){

                          ret = compareMap((E)a,(E)b,key,sortMap.get(key),sort);
                          if(ret!=0){
                              return (int)ret;
                          }
                      }
                }catch(Exception ne){
                  System.out.println(ne);
                }
                return (int)ret;
              }
             });
          }
        private Integer toInt(String num){
            if(StringUtil.isNotNull(num)){
                try{
                    return Integer.parseInt(num);
                }catch (Exception e) {
                    // TODO: handle exception
                    return 0;
                }

            }else{
                return 0;
            }
        }
}

使用方法

        SortList<TestVO> sort=new SortList<>();
        List<TestVO> list=new ArrayList<>();
        TestVO t1=new TestVO("1","1","1",DateUtil.stringToDate(2, "2018-05-04 09:00:00"));
        TestVO t2=new TestVO("2","2","2",DateUtil.stringToDate(2, "2018-05-04 10:00:00"));
        TestVO t3=new TestVO("3","2","2",DateUtil.stringToDate(2, "2018-05-04 08:00:00"));
        list.add(t1);
        list.add(t2);
        list.add(t3);
        LinkedHashMap<String, String> sortMap = new LinkedHashMap<>();
        sortMap.put("getTime", "Date");
        sortMap.put("getId", "String");
        sort.SortMuitled(list, sortMap, "asc");

根據放入map順序，優先第一個條件，第一條件相同按第二條件排