flags |= ObjectStreamConstants.SC_WRITE_METHOD;
}
if (isEnum) {
flags |= ObjectStreamConstants.SC_ENUM;//是否是枚举
}
out.writeByte(flags);
out.writeShort(fields.length); //遍历写入各个类的各个field字段类型名称等信息
for (int i = 0; i < fields.length; i++) {
ObjectStreamField f = fields[i];
out.writeByte(f.getTypeCode()); //typecode参考ObjectStreamField.java类
out.writeUTF(f.getName());
if (!f.isPrimitive()) {
out.writeTypeString(f.getTypeString());
}
}
}
typecode：
[java]
case 'Z': type = Boolean.TYPE; break;
case 'B': type = Byte.TYPE; break;
case 'C': type = Character.TYPE; break;
case 'S': type = Short.TYPE; break;
case 'I': type = Integer.TYPE; break;
case 'J': type = Long.TYPE; break;
case 'F': type = Float.TYPE; break;
case 'D': type = Double.TYPE; break;
case 'L':
case '[': type = Object.class; break;
至此，对象obj的class相关信息已经全部写入。
然后我们再查看具体写入obj数据的过程
[java]
private void writeSerialData(Object obj, ObjectStreamClass desc)
throws IOException
{
ObjectStreamClass.ClassDataSlot[] slots = desc.getClassDataLayout();
for (int i = 0; i < slots.length; i++) {
ObjectStreamClass slotDesc = slots[i].desc;
if (slotDesc.hasWriteObjectMethod()) { //Returns true if represented class is serializable (but not externalizable) and defines a conformant writeObject method. Otherwise, returns false.
Object oldObj = curObj;
ObjectStreamClass oldDesc = curDesc;
PutFieldImpl oldPut = curPut;
curObj = obj;
curDesc = slotDesc;
curPut = null;
debugInfoStack.push(
"custom writeObject data (class \"" +
slotDesc.getName() + "\")");
}
try {
bout.setBlockDataMode(true);
slotDesc.invokeWriteObject(obj, this);
bout.setBlockDataMode(false);
bout.writeByte(TC_ENDBLOCKDATA);
} finally {
if (extendedDebugInfo) {
debugInfoStack.pop();
}
}
curObj = oldObj;
curDesc = oldDesc;
curPut = oldPut;
} else {
defaultWriteFields(obj, slotDesc); //写入对象的字段数据
}
}
}
private void defaultWriteFields(Object obj, ObjectStreamClass desc)
throws IOException
{
// REMIND: perform conservative isInstance check here
desc.checkDefaultSerialize();
int primDataSize = desc.getPrimDataSize(); //先写入private field的数据
if (primVals == null || primVals.length < primDataSize) {
primVals = new byte[primDataSize];
}
desc.getPrimFieldValues(obj, primVals);
bout.write(primVals, 0, primDataSize, false);
ObjectStreamField[] fields = desc.getFields(false);
Object[] objVals = new Object[desc.getNumObjFields()];
int numPrimFields = fields.length - objVals.length;
desc.getObjFieldValues(obj, objVals);
for (int i = 0; i < objVals.length; i++) { //写入非private的数据
if (extendedDebug