[英]Unable to read data from CBOR File
我的目標是使用文件將TargetModel類的實例存儲為CBOR格式。 如果有其他方法,它對我有用!
我正在使用Jackson CBOR API讀寫文件中的數據,並將數據寫入文件。
我正在使用ObjectMapper類的writeValue方法編寫TargetModel的實例,但是當我嘗試讀取數據時,當我嘗試使用ReadValue讀取對象時,它將引發JsonMappingException 。
請幫我! 因此,我遇到了嚴重的麻煩。
主類
package cborStoring;
public class MainClass {
public static void main (String[] args) throws Exception{
String targetfilePath = "/home/vaio/Documents/mySampleFile";
CBORWriter myCborWriter = new CBORWriter();
TargetModel sampleModel = new TargetModel("rajat", "dfdsf");
// TestClass sampleModel = new TestClass();
Object inputObject = (Object)sampleModel;
myCborWriter.writeObject(inputObject, targetfilePath);
CBORReader myCborReader = new CBORReader();
Object readObj = myCborReader.readObject(targetfilePath);
TargetModel myModel = (TargetModel)readObj;
// TestClass myModel = (TestClass)readObj;
System.out.println("Program Ends!");
}
}
CBORWriter.java
package cborStoring;
public class CBORWriter {
public CBORWriter(){
}
public void writeObject(Object inputObject, String targetfilePath) throws Exception{
FileOutputStream fos = new FileOutputStream(targetfilePath, true);
if (!(new File(targetfilePath)).exists())
(new File(targetfilePath)).createNewFile();
CBORFactory f = new CBORFactory();
ObjectMapper mapper = new ObjectMapper(f);
mapper.writeValue(fos,inputObject);
fos.close();
}
}
CBORReader.java
package cborStoring;
public class CBORReader {
public CBORReader(){
}
public Object readObject(String targetFilePath) throws Exception{
FileInputStream fis = new FileInputStream(targetFilePath);
CBORFactory f = new CBORFactory();
ObjectMapper myMapper = new ObjectMapper(f);
CBORParser myCborParser = f.createParser(fis);
//Object readObject = myMapper.readValue(myCborParser, Object.class);
//Object readObject = myMapper.readValue(myCborParser, TargetModel.class); : This does NOT Work throws JSONMappingException
Object readObject = myMapper.readValue(myCborParser, TargetModel.class);
return readObject;
}
}
我不知道潛在的問題是什么,但是可以將代碼簡化很多,如下所示:
ObjectMapper映射器= new ObjectMapper(new CBORFactory()); mapper.writeValue(file,objectToWrite); TargetModel結果= mapper.readValue(文件,TargetModel.class);
分別構造解析器或生成器通常沒有多大意義。 另外,請確保使用最新的可用版本。 2.5.3此時。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.