我有以下復(fù)雜的 POJO 類發(fā)票public class Measure { private String id; private Float value; public String getId() { return id; } public void setId(String id) { this.id = id; } public Float getValue() { return value; } public void setValue(Float value) { this.value = value; }}public class LineItem { private Integer lineNumber; private Measure shipped; private List<LineItem> lineItems; public Integer getLineNumber() { return lineNumber; } public void setLineNumber(Integer lineNumber) { this.lineNumber = lineNumber; } public Measure getShipped() { return shipped; } public void setShipped(Measure shipped) { this.shipped = shipped; } public List<LineItem> getLineItems() { return lineItems; } public void setLineItems(List<LineItem> lineItems) { this.lineItems = lineItems; }}public class Invoice { private String originUid; private String vehicleUid; private List<LineItem> lineItems; public String getOriginUid() { return originUid; } public void setOriginUid(String originUid) { this.originUid = originUid; } public String getVehicleUid() { return vehicleUid; } public void setVehicleUid(String vehicleUid) { this.vehicleUid = vehicleUid; } public List<LineItem> getLineItems() { return lineItems; } public void setLineItems(List<LineItem> lineItems) { this.lineItems = lineItems; }}現(xiàn)在我想深入遍歷每個(gè)字段，包括 Invoice 對(duì)象中的嵌套對(duì)象，并使用反射更新它們。我可以遞歸調(diào)用 updateIncomingObject()。但我需要知道如何將嵌套對(duì)象從字段中取出，如注釋部分所示。如何將字段轉(zhuǎn)換為對(duì)象實(shí)例？
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要訪問數(shù)組的對(duì)象（用 [] 定義的字段），您可以執(zhí)行以下操作：
if (incomingField.getType().isArray()) {
Object[] thisArray = (Object[]) incomingField.get(incomingObject);
for (int k = 0; k < thisArray.length; k++) {
Object occurrence = thisArray[k];
Object result = updateIncomingObject(occurrence);
thisArray[k] = result;
}
incomingField.set(incomingObject, thisArray);
}
要訪問List的對(duì)象，您可以執(zhí)行以下操作：
if (List.class.isAssignableFrom(incomingField.getType())) {
List<?> thisList = (List<?>) incomingField.get(incomingObject);
for (int k = 0; k < thisList.size(); k++) {
Object occurrence = thisList.get(k);
Object result = updateIncomingObject(occurrence);
thisList.set(k, occurrence);
}
}
注意：如果在迭代數(shù)組/列表時(shí)調(diào)用updateIncomingObject并且數(shù)組/列表中的對(duì)象是數(shù)組 (Object[])，則您的方法將不會(huì)執(zhí)行任何操作，因?yàn)閿?shù)組 (Object[]) 的聲明字段數(shù)班級(jí)為0。
我希望這對(duì)你有幫助。
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