Ich dachte, Frühling Rahmen könnte help.Here meines Beispiel des Frühlings-core-4.1.5:
Klassendeklaration:
public static class A{
private String a;
private String b;
private String c;
private C d;
private int e;
//getter&setter here
public static class C {
private String aa;
private String bb;
private String cc;
//getter&setter here
public static class B{
private Integer a;
private Long b;
private Boolean c;
private D d;
private Integer e;
//getter&setter here
public static class D {
private Integer aa;
private Long bb;
private Boolean cc;
//getter&setter here
class ObjectConverter implements Converter<Object, Object> {
private final ConversionService conversionService;
private final Class targetClass;
public ObjectConverter(ConversionService conversionService, Class targetClass) {
this.conversionService = conversionService;
this.targetClass = targetClass;
}
@Override
public Object convert(Object source) {
Object ret=null;
try {
ret = targetClass.newInstance();
Field[] fields = targetClass.getDeclaredFields();
for (Field field : fields) {
PropertyDescriptor sourceDescriptor = new PropertyDescriptor(field.getName(),source.getClass());
PropertyDescriptor targetDescriptor = new PropertyDescriptor(field.getName(),targetClass);
if (sourceDescriptor.getReadMethod()==null || targetDescriptor.getWriteMethod() == null) {
//record error here
break;
}
Class<?> sourcePType = sourceDescriptor.getPropertyType();
Class<?> targetPType = targetDescriptor.getPropertyType();
if(conversionService.canConvert(sourcePType,targetPType)){
Object sourceValue = sourceDescriptor.getReadMethod().invoke(source);
Object targetValue = conversionService.convert(sourceValue, targetPType);
targetDescriptor.getWriteMethod().invoke(ret,targetValue);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return ret;
}
}
main-Methode:
A orgA = new A();
orgA.a="123";
orgA.b="1234567";
orgA.c="1";
orgA.d = new C();
orgA.d.aa="321";
orgA.d.bb="7654321";
orgA.d.cc="0";
orgA.e=-99;
System.out.println(orgA);
try {
ConfigurableConversionService conversionService = new DefaultConversionService();
//if you are not satisfied with the final A result, then
//customize your own Boolean->String Converter;
// conversionService.addConverter(new Converter<Boolean, String>() {
// @Override
// public String convert(Boolean source) {
// return source==null||!source?"0":"1";
// }
// });
conversionService.addConverter(A.class, B.class, new ObjectConverter(conversionService, B.class));
conversionService.addConverter(B.class, A.class, new ObjectConverter(conversionService, A.class));
conversionService.addConverter(C.class, D.class, new ObjectConverter(conversionService, D.class));
conversionService.addConverter(D.class, C.class, new ObjectConverter(conversionService, C.class));
B b = conversionService.convert(orgA, B.class);
System.out.println(b);
A a = conversionService.convert(b, A.class);
System.out.println(a);
} catch (Exception e) {
e.printStackTrace();
}
Ergebnisse:
A {a = '123', b = '1234567', c = '1', d = C {aa = '321', bb = '7654321', cc = '0'}, e = -99}
B {a = 123, b = 1234567, c = richtig, d = D {aa = 321, bb = 7654321, cc = falsch}, e = -99}
A {a = '123', b = '1234567', c = 'wahr', d = C {aa = '321', bb = '7654321', cc = 'falsch'}, e = -99}
Das scheint feine Lösung, aber ich habe ein paar Fragen. Warum muss ich Konverter deklarieren, sollte automatisch die Quell- und Zielklasse automatisch finden. – SacJn
Und ich benutze Struts Framework bereits so Kann es einige Konflikte verursachen, wenn ich diese Bibliothek verwende? Ein weiteres Problem, das ich jetzt finde. Quell- und Konverterklassen haben für einige Felder nicht den gleichen Namen. – SacJn