我在构造一个处理Binary De/Serialization的类。方法open()
收到InputStream
和OutputStream
。这些是由接收路径作为参数的另一个open()
方法创建的。 InputStream
实际上是一个ByteArrayInputStream
。 我已经做了一些测试,证明InputStream
到达open()
方法与内容 - 实际上是。但是当我尝试设置使用它的ObjectInputStream
时,它不起作用。没有例外,但是当我尝试从它读取字节时,它总是给我-1
。ObjectInputStream在用ByteArrayInputStream构造之后没有可用的字节
BinaryStrategy类
public class BinaryStrategy implements SerializableStrategy{
public BinaryStrategy(){
try{
open("products.ser");
}catch(IOException ioe){
}
}
@Override
public void open(InputStream input, OutputStream output) throws IOException {
try{
this.ois = new ObjectInputStream(input);
}catch(Exception ioe){
System.out.println(ioe);
}
this.oos = new ObjectOutputStream(output);
}
@Override
public void writeObject(fpt.com.Product obj) throws IOException {
oos.writeObject(obj);
oos.flush();
}
@Override
public Product readObject() throws IOException {
Product read = new Product();
try{
read.readExternal(ois);
}catch(IOException | ClassNotFoundException exc){
System.out.println(exc);
}
return read;
}
}
接口SerializableStrategy(只是默认方法)
default void open(Path path) throws IOException {
if (path != null) {
ByteArrayInputStream in = null;
if (Files.exists(path)) {
byte[] data = Files.readAllBytes(path);
in = new ByteArrayInputStream(data);
}
OutputStream out = Files.newOutputStream(path);
open(in, out);
}
产品类
public class Product implements java.io.Externalizable {
@Override
public void writeExternal(ObjectOutput out) throws IOException {
out.writeLong(getId());
out.writeObject(getName());
out.writeObject(getPrice());
out.writeObject(getQuantity());
}
@Override
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
this.setId((Long)in.readLong());
this.setName((String) in.readObject());
this.setPrice((Double) in.readObject());
this.setQuantity((Integer) in.readObject());
}
我不得不因为这些属性是它个性化SimpleProperty
小号
在public void open(InputStream input, OutputStream output)
我试图做一些东西如下测试:
public void open(InputStream input, OutputStream output) throws IOException {
try{
System.out.println(input.available() + " " + input.read() + " " + input.read());
//is gives me: 181 172 237
//181 is the exact size of the file I have, so i think that the Output is ok
//172 237 - just some chars that are in the file
//I know that for now on it is going to give me an excepetion because
// of the position of the index that is reading. I did it just to test
this.ois = new ObjectInputStream(input);
}catch(Exception ioe){
System.out.println(ioe);
}
this.oos = new ObjectOutputStream(output);
}
,然后其他测试:
public void open(InputStream input, OutputStream output) throws IOException {
try{
this.ois = new ObjectInputStream(input);
System.out.println(ois.available() + " " + ois.read());
//here is where I am receiving -1 and 0 available bytes!
//so something is going wrong right here.
//i tried to just go on and try to read the object,
//but I got a EOFException, in other words, -1.
}catch(Exception ioe){
System.out.println(ioe);
}
this.oos = new ObjectOutputStream(output);
}
向我们展示的代码的其余部分,我们没有什么可以只用这个 –
我做编辑它现在。 –
请告诉我们你得到的代码-1也 –