java - JSON解析异常: Failed to decode VALUE_STRING as base64 (MIME-NO-LINEFEEDS): Illegal character '"' (code 0x22) in base64 content

Question

使用 Jackson，我正在尝试用 JSON 编码数据，但它给出了异常。

我尝试了 String 数据和 byte[] 数据:

String representation of same data is here:
Bytes converted to String-------->>
{
 "appname": "aaa",
 "deviceType": "diehdcj",
 "reportedDate": "2015-05-03T15:38:45+00:00",
 "sessionId": "5366372183482-6736-23562378",
 "deviceId": "2151272389",
 "commandName" : "wqgduwusdue",
 "protocolVersion" : "0.1",
 "protocolName" : "whjs_ashk_ask",
 "data" : "false"
}

Java

16:50:46.065 [] [] ERROR AAATSHConnector [http-apr-10.40.120.85-80-exec-3] - JSON Parsing Exception: Failed to decode VALUE_STRING as base64 (MIME-NO-LINEFEEDS): Illegal character '"' (code 0x22) in base64 content

这是执行解析的代码:

Java

@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public Response retrieveDevicePassword(InputStream request, @Context HttpServletRequest servletRequest) throws BadRequestException, ValidationException, UnknownServerException
{
    ObjectMapper objectMapper = new ObjectMapper();
    DemoRequest req = null;
    DemoRequest res = null;
    byte[] data = null;
    data= IOUtils.toByteArray(request);
    DemoRequest = objectMapper.readValue(data, DemoRequest.class); //It's where the Exception occurs

Java

//Snippet of POJO
@XmlRootElement(name = "demoRequest") 
@JsonInclude(Include.NON_EMPTY) 
public class DemoRequest { 

private String commandName;

private String sessionId;

private byte[] data;

//getters & setters 

}

令人惊讶的是，当我尝试转换相同的 String 或 byte[] 并在实际内容 "data": "true"中稍作更改时，它起作用了。

谁能帮忙

找到了解决方案，但不知道它到底在做什么:如果我在 false 前面放置一个转义字符，比如 "data": "\false"，它工作正常。

对此有何解释？

Answer 1

JSON Parsing Exception: Failed to decode VALUE_STRING as base64 (MIME-NO-LINEFEEDS): Illegal character '"' (code 0x22) in base64 content

当属性类型为byte[]且json内容用String表示时出现上述异常。 Jackson 认为在这种情况下，json 数据表示为 base64 编码，并尝试将其解码为 byte[]。如果数据字段中的字符串不是正确编码的 base64 字符串，jackson 会引发上述异常。