这似乎很简单但我没有得到序列化的JsonNode反序列化。这是我的测试类
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
public class Foo implements Serializable {
private String string;
private transient JsonNode jsonNode;
public Foo(String string, JsonNode jsonNode) {
this.string = string;
this.jsonNode = jsonNode;
}
private void writeObject(ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
if (this.jsonNode != null) out.writeObject((new ObjectMapper()).writeValueAsBytes(this.jsonNode));
// out.writeObject(this.jsonNode.textValue());
}
private void readObject(ObjectInputStream in) throws IOException,ClassNotFoundException {
in.defaultReadObject();
this.jsonNode = (new ObjectMapper()).readValue(in, JsonNode.class);
}
}
当我尝试反序列化时出现此错误
com.fasterxml.jackson.databind.JsonMappingException: No content to map due to end-of-input
这是单元测试
import com.fasterxml.jackson.databind.node.JsonNodeFactory;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.testng.annotations.Test;
import java.io.*;
import static org.testng.Assert.assertEquals;
public class FooTest {
@Test
public void testSerialization() {
JsonNodeFactory nodeFactory = new JsonNodeFactory(false);
ObjectNode node = nodeFactory.objectNode();
ObjectNode child = nodeFactory.objectNode(); // the child
child.put("message", "test");
node.put("notification", child);
Foo foo = new Foo("Bar", node);
String fileName = "foo.ser";
try (
OutputStream file = new FileOutputStream(fileName);
OutputStream buffer = new BufferedOutputStream(file);
ObjectOutput output = new ObjectOutputStream(buffer);
){
output.writeObject(foo);
}
catch(IOException ex){
ex.getStackTrace();
}
Foo fooNew = null;
//deserialize the ser file
try(
InputStream file = new FileInputStream(fileName);
InputStream buffer = new BufferedInputStream(file);
ObjectInput input = new ObjectInputStream (buffer);
){
//deserialize the Object
fooNew = (Foo) input.readObject();
}
catch(ClassNotFoundException ex){
ex.printStackTrace();
}
catch(IOException ex){
ex.printStackTrace();
}
assertEquals(foo, fooNew);
}
}
答案 0 :(得分:4)
您的读写操作不匹配。
在写入端,您使用ObjectOutputStream.writeObject(Object)
编写包含序列化JSON内容的byte[]
。在读取端,当您实际需要首先读取ObjectMapper.readValue(InputStream, Class)
对象时,尝试使用byte[]
读取流中的原始字节,因为这是您编写的,然后使用ObjectMapper.readValue(byte[], Class)
。
或者可能更好的解决方案是你可以在写入端使用ObjectMapper.writeValue(OutputStream, Object)
。
试试这个:
private void writeObject(ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
if(jsonNode == null){
out.writeBoolean(false);
} else {
out.writeBoolean(true);
new ObjectMapper().configure(JsonGenerator.Feature.AUTO_CLOSE_TARGET, false).writeValue(out, jsonNode);
}
}
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
in.defaultReadObject();
if(in.readBoolean()){
this.jsonNode = new ObjectMapper().configure(JsonParser.Feature.AUTO_CLOSE_SOURCE, false).readValue(in, JsonNode.class);
}
}