java 私有成员的java反射getFields| 动态访问对象名称值
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java reflection getFields for private member| accessing object name value dynamically
提问by Ravi Parekh
I want to print all of the class's properties with their name and values. I have used reflection, but getFieldsgive me length of 0.
我想用它们的名称和值打印所有类的属性。我使用了反射，但getFields给我长度为 0。
RateCode getMaxRateCode = instance.getID(Integer.parseInt((HibernateUtil
.currentSession().createSQLQuery("select max(id) from ratecodes")
.list().get(0).toString())));
for (Field f : getMaxRateCode.getClass().getFields()) {
try {
System.out.println(f.getGenericType() + " " + f.getName() + " = "
+ f.get(getMaxRateCode));
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
RateCode.java
速率代码.java
private Integer rateCodeId;
private String code;
private BigDecimal childStay;
private DateTime bookingTo;
private Short minPerson;
private Boolean isFreeNightCumulative = false;
private boolean flat = false;
private Timestamp modifyTime;
回答by Peter Lawrey
Class.getFields() only gives you public fields. Perhaps you wanted the JavaBean getters?
Class.getFields() 只为您提供公共字段。也许您想要 JavaBean getter？
BeanInfo info = Introspector.getBeanInfo(getMaxRateCode.getClass());
for ( PropertyDescriptor pd : info.getPropertyDescriptors() )
System.out.println(pd.getName()+": "+pd.getReadMethod().invoke(getMaxRateCode));
If you want to access the private fields, you can use getDeclaredFields() and call field.setAccessible(true) before you use them.
如果要访问私有字段，可以在使用它们之前使用 getDeclaredFields() 并调用 field.setAccessible(true)。
for (Field f : getMaxRateCode.getClass().getDeclaredFields()) {
f.setAccessible(true);
Object o;
try {
o = f.get(getMaxRateCode);
} catch (Exception e) {
o = e;
}
System.out.println(f.getGenericType() + " " + f.getName() + " = " + o);
}
回答by wjans
getFieldsonly returns public fields. If you want all fields, see getDeclaredFields
getFields只返回公共字段。如果您想要所有字段，请参阅getDeclaredFields
