（类比较器）java对比两个相同实体类中属性的值的差异

平时经常会遇到这种情况，比如修改一个单子，需要记录修改记录，这就需要做前后对比，所以自己定义了一个工具类，细节还可以优化，希望大家提出宝贵的意见。

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface AnjiDescription {/*** 加上注解默认对比* @return*/String value();
}

public class ComparisonResult {private String key;private String label;private String previous;private String later;public String getKey() {return key;}public void setKey(String key) {this.key = key;}public String getLabel() {return label;}public void setLabel(String label) {this.label = label;}public String getPrevious() {return previous;}public void setPrevious(String previous) {this.previous = previous;}public String getLater() {return later;}public void setLater(String later) {this.later = later;}
}

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public class CompareUtils {private final static String DATE_FORMATTR_SECOND = "yyyy-MM-dd HH:mm:ss";/*** 比较两个实体属性值，返回一有差异的属性* @param obj1      进行属性比较的对象1* @param obj2      进行属性比较的对象2* @return*/public static List<ComparisonResult> compareFields(Object obj1, Object obj2, Class clazz) throws Exception {try {List<String> ignoreList = getCompareFields(clazz);Map<String,String> descsMap = getFieldSwaggerValue(clazz);List<ComparisonResult> list = new ArrayList<>();// 只有两个对象都是同一类型的才有可比性if (obj1.getClass() == obj2.getClass()) {Class claz = obj1.getClass();// 获取object的属性描述PropertyDescriptor[] pds = Introspector.getBeanInfo(claz,Object.class).getPropertyDescriptors();for (PropertyDescriptor pd : pds) {String name = pd.getName();String label = descsMap.get(name);if (ignoreList != null && !ignoreList.contains(name)) {continue;}Method readMethod = pd.getReadMethod();Object o1 = readMethod.invoke(obj1);Object o2 = readMethod.invoke(obj2);String r1 = null,r2 = null;if (Objects.isNull(o1) && Objects.isNull(o2)){continue;}if (null == o1 || null == o2){setResult(o1, o2, name, label, list);continue;}if (compareField(o1, o2)) {setResult(o1, o2, name, label, list);}}}else{throw new Exception("对象类型不一致");}return list;} catch (Exception e) {throw new Exception("对象比较失败", e);}}/*** 获取比较的类中字段** @param objectClass* @return*/private static List<String> getCompareFields(Class objectClass) {Field[] fields = objectClass.getDeclaredFields();List<String> map = new ArrayList<>();for (Field f : fields) {boolean annotationPresent2 = f.isAnnotationPresent(AnjiDescription.class);if (annotationPresent2) {map.add(f.getName());}}return map;}/*** 获取实体类字段的description** @param clazz* @return*/private static Map<String, String> getFieldSwaggerValue(Class clazz) {Field[] fields = clazz.getDeclaredFields();Map<String, String> map = new HashMap<>();for (Field f : fields) {boolean annotationPresent2 = f.isAnnotationPresent(AnjiDescription.class);if (annotationPresent2) {AnjiDescription name = f.getAnnotation(AnjiDescription.class);String nameStr = name.value();map.put(f.getName(), nameStr);}}return map;}private static void setResult(Object o1, Object o2,String name,String label, List<ComparisonResult> list){Object ot = null;String r1 = null,r2 = null;if (!Objects.isNull(o1)){ot = o1;}else if(!Objects.isNull(o2)){ot = o2;}if (ot instanceof String){r1 = objectToString(o1);r2 = objectToString(o2);}else if(ot instanceof BigDecimal){System.out.println("BigDecimal");r1 = objectToString(o1);r2 = objectToString(o2);}else if (ot instanceof Integer){System.out.println("Integer");r1 = objectToString(o1);r2 = objectToString(o2);}else if (ot instanceof Boolean){System.out.println("Boolean");r1 = booleanToString(o1);r2 = booleanToString(o2);}else if (ot instanceof Long){System.out.println("Long");r1 = objectToString(o1);r2 = objectToString(o2);}else if (ot instanceof LocalDateTime){System.out.println("LocalDateTime");r1 = localDateTimeToString(o1);r2 = localDateTimeToString(o2);}ComparisonResult result = new ComparisonResult();result.setKey(name);result.setPrevious(r1);result.setLater(r2);result.setLabel(label);list.add(result);}private static boolean compareField(Object o1, Object o2){Boolean sign = false;Object ot = null;if (!Objects.isNull(o1)){ot = o1;}else if(!Objects.isNull(o2)){ot = o2;}if (ot instanceof String){sign = !o1.equals(o2);}else if(ot instanceof BigDecimal){System.out.println("BigDecimal");sign = ((BigDecimal) o1).compareTo((BigDecimal) o2) != 0 ? true : false;}else if (ot instanceof Integer){System.out.println("Integer");sign = ((Integer) o1).compareTo((Integer) o2) != 0 ? true : false;}else if (ot instanceof Boolean){System.out.println("Boolean");sign = ((Boolean) o1).compareTo((Boolean) o2) != 0 ? true : false;}else if (ot instanceof Long){System.out.println("Long");sign = ((Long) o1).compareTo((Long) o2) != 0 ? true : false;}else if (ot instanceof LocalDateTime){System.out.println("LocalDateTime");sign = ((LocalDateTime) o1).compareTo((LocalDateTime) o2) != 0 ? true : false;}return sign;}private static String objectToString(Object obj){if(null == obj){return "";}else {return obj.toString();}}private static String booleanToString(Object obj){if(null == obj){return null;}else {return(Boolean) obj ? "是" : "否";}}private static String localDateTimeToString(Object obj){if(null == obj){return null;}else {DateTimeFormatter df = DateTimeFormatter.ofPattern(DATE_FORMATTR_SECOND);LocalDateTime ld = LocalDateTime.now();return df.format(ld);}}
}

测试

private String id;@AnjiDescription("标题")private String title;@AnjiDescription("作者")private String author;@AnjiDescription("时间long")private long postDate;@AnjiDescription("年龄")private int age;@AnjiDescription("金额")private BigDecimal price;@AnjiDescription("是否婚配")private Boolean sex;@AnjiDescription("时间戳")private LocalDateTime dateTime;long a ;Book book = new Book("1","java","fu",123,2,null,null, LocalDateTime.now(),1);book.setId("1");book.setTitle("java");book.setAuthor("fu");book.setPostDate(123);Book book1 = new Book("2","python","fu",0,3,new BigDecimal(BigInteger.ZERO),null,LocalDateTime.now()    ,1);book1.setId("2");book1.setTitle("python");book1.setAuthor("fu");book1.setPostDate(0);CompareUtils.compareFields(book,book1,book.getClass());

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