java 逐个字段比较两个对象并显示差异
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Compare two objects field by field and show the difference
提问by Rohit K
I want to compare two object i.e two database rows field by field.
e.g. Object1[name="ABC", age=29, email="[email protected]"]and Object2[name="XYZ", age=29, email="[email protected]"]
我想逐个字段比较两个对象，即两个数据库行。例如Object1[name="ABC", age=29, email="[email protected]"]和Object2[name="XYZ", age=29, email="[email protected]"]
suppose I want to compare these two object and I want output like this
假设我想比较这两个对象并且我想要这样的输出
[{
"fieldName" : "email",
"OldObjectValue" : "[email protected]",
"NewObjectValue" : "[email protected]"
},
{
"fieldName" : "name",
"OldObjectValue" : "ABC",
"NewObjectValue" : "XYZ"
}]
Here age is same so age field is not present in output.
这里年龄相同，因此输出中不存在年龄字段。
If this is possible by doing generic method using reflection please provide some code. because I have not worked on reflection yet. Please help.
如果可以通过使用反射进行泛型方法来实现，请提供一些代码。因为我还没有进行反思。请帮忙。
回答by isurujay
According to your requirement you can do this as follow.
根据您的要求，您可以执行以下操作。
you can take two database rows to two objects. Eg: SampleObject
您可以将两个数据库行转换为两个对象。例如：样本对象
public class SampleObject {
private String name;
private int age;
private String email;
public SampleObject(String name, int age, String email) {
this.name = name;
this.age = age;
this.email = email;
}
.
.
I imagine your results will be an object too. Eg : ResultObject
我想你的结果也将是一个对象。例如：结果对象
public class ResultObject {
private String fieldName;
private String OldObjectValue;
private String NewObjectValue;
.
.
You can just define a compareField kind of method in SampleObject
你可以在 SampleObject 中定义一个 compareField 类型的方法
public List<ResultObject> compareFields(SampleObject object) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException{
List<ResultObject> resultList = new ArrayList<ResultObject>();
Field[] fields = this.getClass().getDeclaredFields();
for(Field field : fields){
if(!field.get(this).equals(field.get(object))){
ResultObject resultObject = new ResultObject();
resultObject.setFieldName(field.getName());
resultObject.setOldObjectValue(field.get(this).toString());
resultObject.setNewObjectValue(field.get(object).toString());
resultList.add(resultObject);
}
}
return resultList;
}
Then you can make it work.
然后你就可以让它工作了。
SampleObject object1 = new SampleObject("ABC", 29, "[email protected]");
SampleObject object2 = new SampleObject("XYZ", 29, "[email protected]");
List<ResultObject> resultList = object1.compareFields(object2);
Thanks
谢谢
