给列表加个序列号

曾经终败给现在 2022-08-05 08:41 155阅读 0赞

给列表加个序号

package com.miracle.mby.utils;
    
    
    import com.mw.sql.Paging;
    import com.mw.sql.engine.PagingImpl;
    
    import java.io.Serializable;
    import java.lang.reflect.Field;
    import java.lang.reflect.Method;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.UUID;
    
    /**
     * @author LiAnAn
     */
    public class SequenceUtils implements Serializable{
        private static final String SN = "sn";
        public static void main(String arg0[])  {
            /*List<ModelTest> list = new ArrayList<>();
            for(int i=0;i<10;i++){
                ModelTest test = new ModelTest();
                test.setId(UUID.randomUUID().toString());
                test.setName("姓名"+i);
                list.add(test);
            }
            //List测试
            List<ModelTest> testList = getList(list);
            for(ModelTest test:testList){
                System.out.println(test.getSn()+"--"+test.getName()+"---"+test.getId());
            }
    
            //page测试
            Paging<ModelTest> testPaging = new PagingImpl<>();
            testPaging.setTotalCount(list.size());
            testPaging.setData(list);
            testPaging.setStart(0);
            testPaging.setLimit(10);
            Paging<ModelTest> paging = getPaging(testPaging);
            for(ModelTest test:paging.getData()){
                System.out.println(test.getSn()+"--"+test.getName()+"---"+test.getId());
            }*/
        }
    
        public static <T> List<T> getList(List<T> list){
            return getList(list,0);
        }
    
        private static <T> List<T> getList(List<T> list,int startSn){
            List<T> arrayList = new ArrayList<>();
            if(list!=null && list.size()>0){
                try{
                    for(int i=0;i<list.size();i++){
                        T t= list.get(i);
                        Class<?> cla = t.getClass();
                        for(Field field:cla.getDeclaredFields()){
                            field.setAccessible(true);
                            if(field.getName().equals(SN)){
                                startSn++;
                                field.set(t,startSn);
    
                            }
                        }
                        arrayList.add(t);
                    }
                }catch(Exception e){
                    e.printStackTrace();
                }
    
            }
            return arrayList;
        }
        /**
        public static <T> Paging<T> getPaging(Paging<T> paging){
            Paging<T> newPaging = new PagingImpl<>();
            if(paging!=null && paging.getTotalCount()>0){
                List<T> list = paging.getData();
                newPaging.setData(getList(list,paging.getStart()));
                newPaging.setStart(paging.getStart());
                newPaging.setLimit(paging.getLimit());
                newPaging.setTotalCount(paging.getTotalCount());
            }
            return newPaging;
        }**/
    }

package com.miracle.mby.utils;
    
    public class ModelTest {
        private int sn;
        private String id;
        private String name;
    
        public String getId() {
            return id;
        }
    
        public void setId(String id) {
            this.id = id;
        }
    
        public String getName() {
            return name;
        }
    
        public int getSn() {
            return sn;
        }
    
        public void setSn(int sn) {
            this.sn = sn;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    }