package com.lizi.admin.utils.contrast;
import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;public class EntityUtil {
private static String GET_METHOD_PREFIX = "get"; public static <T> Object getFieldValue(T t, String fieldName) throws IllegalArgumentException, NoSuchMethodException, SecurityException, IllegalAccessException, InvocationTargetException{ String methodName = getGetMethodRealName(fieldName); if(methodName == null){ throw new IllegalArgumentException("外部订单号不能为空"); } Class<?> clazz = t.getClass(); Method getMethod = clazz.getMethod(methodName); return getMethod.invoke(t); } private static String getGetMethodRealName(String fieldName){ if(fieldName == null || fieldName.length() ==0){ return null; } String getMethodRealName = GET_METHOD_PREFIX + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1); return getMethodRealName; }} package com.lizi.admin.utils.contrast;import java.lang.reflect.InvocationTargetException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;public class ListUtils {
private static <T> boolean isBaseEqual(List<T> first, List<T> second){ if(first == null || second == null || first.size() == 0 || second.size() == 0){ return false; } return true; } /** * 获取在第一个集合中但是不在第二个集合中的数据 * @param first 第一个集合 * @param second 第二个集合 * @param compareFieldName 需要比较的属性名称 * @return * @throws IllegalArgumentException * @throws NoSuchMethodException * @throws SecurityException * @throws IllegalAccessException * @throws InvocationTargetException */ public static <T> List<T> getInFirstNotInSecondList(List< T> first, List<T> second, String compareFieldName) throws IllegalArgumentException, NoSuchMethodException, SecurityException, IllegalAccessException, InvocationTargetException{ List<T> result = new ArrayList<>(); if(isBaseEqual(first, second)){ Map<String, String> listMap = new HashMap<>(); String temp; for(T t : second){ temp = String.valueOf(EntityUtil.getFieldValue(t, compareFieldName)); listMap.put(temp, temp); } for(T t : first){ temp = String.valueOf(EntityUtil.getFieldValue(t, compareFieldName)); if(listMap.get(temp) == null){ result.add(t); } } } return result; } /** * 获取两个集合中共有元素集合，通过比对指定的属性名称所对应的属性值 * @param first 集合一 * @param second 集合二 * @param compareFieldName 需要做比较的属性名称 * @return 两个集合中共有元素 * @throws IllegalArgumentException * @throws NoSuchMethodException * @throws SecurityException * @throws IllegalAccessException * @throws InvocationTargetException */ public static <T> List<T> getCommonElements(List<T> first, List<T> second,String compareFieldName) throws IllegalArgumentException, NoSuchMethodException, SecurityException, IllegalAccessException, InvocationTargetException{ List<T> result = new ArrayList<>(); if(isBaseEqual(first, second)){ Map<String, List<T>> listMap = new HashMap<>(); String temp; for(T t : second){ temp = String.valueOf(EntityUtil.getFieldValue(t, compareFieldName)); if(listMap.get(temp) == null){ listMap.put(temp, new ArrayList<T>()); } listMap.get(temp).add(t); } for(T t : first){ temp = String.valueOf(EntityUtil.getFieldValue(t, compareFieldName)); if(listMap.get(temp) != null){ result.add(t); result.addAll(listMap.get(temp)); } } } return result; } private static <T, E> boolean isBaseEqualOne(List<T> first, List<E> second){ if(first == null || second == null || first.size() == 0 || second.size() == 0){ return false; } return true; } /** * * @param first * @param second * @param compareFieldName * @return * @throws IllegalArgumentException * @throws NoSuchMethodException * @throws SecurityException * @throws IllegalAccessException * @throws InvocationTargetException */ public static <T, E> List<Object> getInFirstNotInSecondListOne(List< T> first, List<E> second, String compareFieldName) throws IllegalArgumentException, NoSuchMethodException, SecurityException, IllegalAccessException, InvocationTargetException{ List<Object> result = new ArrayList<>(); if(isBaseEqualOne(first, second)){ Map<String, String> listMap = new HashMap<>(); String temp; for(E e : second){ temp = String.valueOf(EntityUtil.getFieldValue(e, compareFieldName)); listMap.put(temp, temp); } for(T t : first){ temp = String.valueOf(EntityUtil.getFieldValue(t, compareFieldName)); if(listMap.get(temp) == null){ result.add(t); } } } return result; } public static <T, E> List<Object> getCommonElementsOne(List<T> first, List<E> second,String compareFieldName) throws IllegalArgumentException, NoSuchMethodException, SecurityException, IllegalAccessException, InvocationTargetException{ List<Object> result = new ArrayList<>(); if(isBaseEqualOne(first, second)){ Map<String, List<E>> listMap = new HashMap<>(); String temp; for(E e : second){ temp = String.valueOf(EntityUtil.getFieldValue(e, compareFieldName)); if(listMap.get(temp) == null){ listMap.put(temp, new ArrayList<E>()); } listMap.get(temp).add(e); } for(T t : first){ temp = String.valueOf(EntityUtil.getFieldValue(t, compareFieldName)); if(listMap.get(temp) != null){ result.add(t); result.addAll(listMap.get(temp)); } } } return result; }}
package eq;
import java.lang.reflect.InvocationTargetException;import java.util.ArrayList;import java.util.LinkedList;import java.util.List; public class Test { public void aa() throws IllegalArgumentException, NoSuchMethodException, SecurityException, IllegalAccessException, InvocationTargetException{ List<User> first = new ArrayList<>(); first.add(new User("a001" , "张三")); first.add(new User("a002" , "李四")); first.add(new User("a003" , "王五")); first.add(new User("a004" , "不知道")); first.add(new User("a007" , "李大麻子")); List<Student> second=new ArrayList<Student>(); second.add(new Student("a001","大明",3)); second.add(new Student("a002","大林",3)); second.add(new Student("a003","大哈",3)); second.add(new Student("a004","大紫",3)); second.add(new Student("a009","大3",3)); List<Object> inFirstNotInSecond = ListUtils.getInFirstNotInSecondListOne(first, second, "code"); for (int i = 0; i < inFirstNotInSecond.size(); i++) { User u=(User) inFirstNotInSecond.get(i); System.out.println(u.getCode()+","+u.getName()); } System.err.println("inFirstNotInSecond: " + inFirstNotInSecond); List<Object> bothIn = ListUtils.getCommonElementsOne(first, second, "code"); for (int i = 0; i < bothIn.size(); i++) { Object o=bothIn.get(i); if(o.getClass().equals(User.class)){ System.out.println("00000"); } if(o.getClass().equals(Student.class)){ System.out.println("00001"); } } System.err.println("inFirstNotInSecond: " + bothIn); List<User> listsone=new LinkedList<User>(); List<Student> liststwo=new LinkedList<Student>(); for (int i = 0; i < bothIn.size(); i++) { Object o=bothIn.get(i); if(o.getClass().equals(User.class)){ listsone.add((User) o); } if(o.getClass().equals(Student.class)){ liststwo.add((Student) o); } } //比较 for(int i=0;i<listsone.size();i++){ for(int k=0;k<liststwo.size();k++){ if(liststwo.get(k).getCode().equals(listsone.get(i).getCode())){ //数据一致 break; } } } } public static void main(String[] args) throws IllegalArgumentException, NoSuchMethodException, SecurityException, IllegalAccessException, InvocationTargetException { Test t=new Test(); t.aa(); List<User> first = new ArrayList<>(); first.add(new User("a001" , "张三")); first.add(new User("a002" , "李四")); first.add(new User("a003" , "王五")); first.add(new User("a004" , "不知道")); first.add(new User("a007" , "李大麻子")); System.err.println(first); List<User> second = new ArrayList<>(); second.add(new User("a001" , "张三")); second.add(new User("a002" , "李四")); second.add(new User("a003" , "王五")); second.add(new User("a004" , "不知道")); second.add(new User("a006" , "王大麻子")); System.err.println(second); List<User> inFirstNotInSecond = ListUtils.getInFirstNotInSecondList(first, second, "code"); System.err.println("inFirstNotInSecond: " + inFirstNotInSecond); List<User> bothIn = ListUtils.getCommonElements(first, second, "code"); System.err.println("bothIn: " + bothIn); }}