知识点：
1. class.getDeclaredFields(); 获取类的所有字段
2.class.getMethods(); 获取类的方法
3.objValue = method.invoke(obj, new Object[] {}); 通过反射获取属性的值，obj对象，new Object[] {} 方法参数
1.bean
package com.qimh.springbootfiledemo.utils;
import com.alibaba.fastjson.JSONObject;
/**
* @author ex-qiminhui001
*/
public class Person {
private String name;
private Integer age;
private String[] friends;
private JSONObject carts;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
public String[] getFriends() {
return friends;
}
public void setFriends(String[] friends) {
this.friends = friends;
}
public JSONObject getCarts() {
return carts;
}
public void setCarts(JSONObject carts) {
this.carts = carts;
}
}
2.bean的比较工具类
package com.qimh.springbootfiledemo.utils;
import com.alibaba.fastjson.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
/**
* @author ex-qiminhui001
* 判断两个bean是否相等
*/
public class BeanEquals {
/**
* 日志操作类
*/
private static Logger logger = LoggerFactory.getLogger(BeanEquals.class);
/**
* 比较两个BEAN或MAP对象的值是否相等
* 如果是BEAN与MAP对象比较时MAP中的key值应与BEAN的属性值名称相同且字段数目要一致
* @param source
* @param target
* @return
*/
public static boolean domainEquals(Object source, Object target) {
if (source == null || target == null) {
return false;
}
boolean rv = true;
if (source instanceof Map) {
rv = mapOfSrc(source, target, rv);
} else {
rv = classOfSrc(source, target, rv);
}
logger.info("THE EQUALS RESULT IS " + rv);
return rv;
}
/**
* 源目标为MAP类型时
* @param source
* @param target
* @param rv
* @return
*/
private static boolean mapOfSrc(Object source, Object target, boolean rv) {
HashMap<String, String> map = new HashMap<String, String>();
map = (HashMap) source;
for (String key : map.keySet()) {
if (target instanceof Map) {
HashMap<String, String> tarMap = new HashMap<String, String>();
tarMap = (HashMap) target;
if(tarMap.get(key)==null){
rv = false;
break;
}
if (!map.get(key).equals(tarMap.get(key))) {
rv = false;
break;
}
} else {
String tarValue = getClassValue(target, key) == null ? "" : getClassValue(target, key).toString();
if (!tarValue.equals(map.get(key))) {
rv = false;
break;
}
}
}
return rv;
}
/**
* 源目标为非MAP类型时
* @param source
* @param target
* @param rv
* @return
*/
private static boolean classOfSrc(Object source, Object target, boolean rv) {
Class<?> srcClass = source.getClass();
Field[] fields = srcClass.getDeclaredFields();
for (Field field : fields) {
String nameKey = field.getName();
if (target instanceof Map) {
HashMap<String, String> tarMap = new HashMap<String, String>();
tarMap = (HashMap) target;
String srcValue = getClassValue(source, nameKey) == null ? "" : getClassValue(source, nameKey)
.toString();
if(tarMap.get(nameKey)==null){
rv = false;
break;
}
if (!tarMap.get(nameKey).equals(srcValue)) {
rv = false;
break;
}
} else {
if (nameKey.equals("carts")){
System.out.println("field:" + nameKey);
}
if (nameKey.equals("friends")){
System.out.println("field:" + nameKey);
}
//数组类型
if (!StringUtils.isEmpty(getClassValue(source, nameKey)) && getClassValue(source, nameKey) instanceof Object[]){
rv = Arrays.equals((Object[])getClassValue(source, nameKey),(Object[])getClassValue(target, nameKey));
break;
}
String srcValue = getClassValue(source, nameKey) == null ? "" : getClassValue(source, nameKey)
.toString();
String tarValue = getClassValue(target, nameKey) == null ? "" : getClassValue(target, nameKey)
.toString();
if (!srcValue.equals(tarValue)) {
rv = false;
break;
}
}
}
return rv;
}
/**
* 根据字段名称取值
* @param obj
* @param fieldName
* @return
*/
public static Object getClassValue(Object obj, String fieldName) {
if (obj == null) {
return null;
}
try {
Class beanClass = obj.getClass();
Method[] ms = beanClass.getMethods();
for (int i = 0; i < ms.length; i++) {
// 非get方法不取
if (!ms[i].getName().startsWith("get")) {
continue;
}
Object objValue = null;
try {
objValue = ms[i].invoke(obj, new Object[] {});
} catch (Exception e) {
logger.info("反射取值出错：" + e.toString());
continue;
}
if (objValue == null) {
continue;
}
if (ms[i].getName().toUpperCase().equals(fieldName.toUpperCase())
|| ms[i].getName().substring(3).toUpperCase().equals(fieldName.toUpperCase())) {
return objValue;
} else if (fieldName.toUpperCase().equals("SID")
&& (ms[i].getName().toUpperCase().equals("ID") || ms[i].getName().substring(3).toUpperCase()
.equals("ID"))) {
return objValue;
}
}
} catch (Exception e) {
// logger.info("取方法出错！" + e.toString());
}
return null;
}
public static void main(String args[]) {
Person person1 = new Person();
person1.setName("张三");
person1.setAge(20);
JSONObject carts = new JSONObject();
carts.put("bmw","宝马");
carts.put("audi","奥迪");
person1.setCarts(carts);
person1.setFriends(new String[]{"tom","jim"});
Person person2 = new Person();
person2.setName("张三");
person2.setAge(20);
JSONObject carts2 = new JSONObject();
carts2.put("bmw","宝马");
carts2.put("audi","奥迪");
person2.setCarts(carts2);
person2.setFriends(new String[]{"tom","jim2"});
System.out.println(domainEquals(person1,person2));
}
}
3.比较结果：
field:friends
13:55:52.746 [main] INFO com.qimh.springbootfiledemo.utils.BeanEquals - THE EQUALS RESULT IS false
false因为：person2.setFriends(new String[]{"tom","jim2"}); 与person1 的friends值不同
参考连接：https://www.cnblogs.com/chenyaqiang/p/5217497.html
来源：oschina
链接：https://my.oschina.net/qimhkaiyuan/blog/4258295