异常

java.io.FileNotFoundException: Byte array resource [resource loaded from byte array] cannot be resolved to absolute file path

at org.springframework.core.io.AbstractResource.getFile(AbstractResource.java:114)

at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:497)

at com.alibaba.fastjson.util.FieldInfo.get(FieldInfo.java:453)

at com.alibaba.fastjson.serializer.FieldSerializer.getPropertyValueDirect(FieldSerializer.java:110)

at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:196)

at com.alibaba.fastjson.serializer.JSONSerializer.writeWithFieldName(JSONSerializer.java:304)

at com.alibaba.fastjson.serializer.ASMSerializer_1_HttpEntity.write

at com.alibaba.fastjson.serializer.ListSerializer.write(ListSerializer.java:126)

at com.alibaba.fastjson.serializer.MapSerializer.write(MapSerializer.java:243)

at com.alibaba.fastjson.serializer.JSONSerializer.write(JSONSerializer.java:275)

at com.alibaba.fastjson.JSON.toJSONString(JSON.java:648)

at com.alibaba.fastjson.JSON.toJSONString(JSON.java:590)

at com.alibaba.fastjson.JSON.toJSONString(JSON.java:555)

上下文

其中file为MultipartFile

MultiValueMap map = new LinkedMultiValueMap();

final String filename = file.getName();

Path path = file.toPath();

map.add("name", filename);

map.add("filename", filename);

HttpHeaders fileHeaders = new HttpHeaders();

fileHeaders.setContentDispositionFormData("file",filename);

ByteArrayResource contentsAsResource = new ByteArrayResource(Files.readAllBytes(path)){

@Override

public String getFilename(){

return filename;

}

};

map.add("file", new HttpEntity<>(contentsAsResource, fileHeaders));

报错的地方

JSON.toJSONString(map)

toJSONString也不是所有类型的都可以使用，要慎重一点，这里遇到file要去序列化，然后就报错了。