简单XML的安卓自定义转换器没有从XML序列化为java对象

Question

我有一个简单的XML注释类，用于序列化/反序列化。我有一个字节[]数组，我正在使用自定义转换器，但它在读取方法失败

下面是我的简单XML注释对象

@Root
public class Device implements Serializable
{
    @Element
    @Convert(ByteArrayConverter.class)
    protected byte[] imageRef;
...
}

这是我的转换器

import org.simpleframework.xml.convert.Converter;
import org.simpleframework.xml.stream.InputNode;
import org.simpleframework.xml.stream.OutputNode;

public class ByteArrayConverter implements Converter<byte[]>
{

    @Override
    public byte[] read(InputNode node) throws Exception 
    {
        String value = node.getValue();
        //return value.getBytes();
                return new byte[]{1,2,3,4,5};
    }

    @Override
    public void write(OutputNode node, byte[] byteArray) throws Exception 
    {       
        node.setValue("something");     
    }         
}

这是我的XML设备。xml

<device>
    <imageRef>AQIDBAU=</imageRef>
</device>

这是我失败的序列化代码

Strategy strategy = new AnnotationStrategy();
Serializer serializer = new Persister(strategy);
File file = new File("device.xml");     
Device device = serializer.read(Device.class, file);

我在ByteArrayConverter中设置了一个断点。read（）方法，并说它正确执行并返回字节数组。然而，在这之后，在简单的XML中，我得到了这个

Exception in thread "main" org.simpleframework.xml.core.InstantiationException: Incompatible class [B for field 'imageRef' protected byte[] com.test.Device.imageRef at line 4 at org.simpleframework.xml.core.Factory.getOverride(Factory.java:147) at org.simpleframework.xml.core.PrimitiveFactory.getInstance(PrimitiveFactory.java:82) at org.simpleframework.xml.core.Primitive.readElement(Primitive.java:186) at org.simpleframework.xml.core.Primitive.read(Primitive.java:124) at org.simpleframework.xml.core.Composite.readVariable(Composite.java:623) at org.simpleframework.xml.core.Composite.readInstance(Composite.java:573) at org.simpleframework.xml.core.Composite.readUnion(Composite.java:549) at org.simpleframework.xml.core.Composite.readElement(Composite.java:532) at org.simpleframework.xml.core.Composite.readElements(Composite.java:445) at org.simpleframework.xml.core.Composite.access$400(Composite.java:59) at org.simpleframework.xml.core.Composite$Builder.read(Composite.java:1383) at org.simpleframework.xml.core.Composite.read(Composite.java:201) at org.simpleframework.xml.core.Composite.read(Composite.java:148) at org.simpleframework.xml.core.Traverser.read(Traverser.java:92) at org.simpleframework.xml.core.Persister.read(Persister.java:625) at org.simpleframework.xml.core.Persister.read(Persister.java:606) at org.simpleframework.xml.core.Persister.read(Persister.java:584) at org.simpleframework.xml.core.Persister.read(Persister.java:543) at org.simpleframework.xml.core.Persister.read(Persister.java:521) at org.simpleframework.xml.core.Persister.read(Persister.java:426)

任何提示都会有帮助

Answer 1

您使用的是基元类型数组，这可能会导致异常。字节数组是否已编码（例如base64）？如果使用编码，那么在read()/write()中也必须注意这一点

这里的Converter不是最好的选择，最好选择^{}。通过这些，您可以实现对象<->；字符串由您自己进行转换

下面是一个非常简单的例子：

public class ByteArrayTransformer implements Transform<byte[]>
{
    @Override
    public byte[] read(String value) throws Exception
    {
        /*
         * TODO: Implement proper encoding
         */
        return value.getBytes();
    }


    @Override
    public String write(byte[] value) throws Exception
    {
        /*
         * TODO: Implement proper encoding
         */
        return new String(value);
    }

}

这允许您删除转换器（@Convert字段注释和AnnotationStrategy）

最后是如何绑定变压器：

RegistryMatcher m = new RegistryMatcher();
m.bind(byte[].class, new ByteArrayTransformer());

Serializer ser = new Persister(m);

Device d = ser.read(Device.class, f);