Java com.fasterxml.jackson.databind.JsonMappingException:由于输入结束,没有要映射的内容
我需要用JavaPOJO类映射一个JSON数组对象。 我这样写代码:Java com.fasterxml.jackson.databind.JsonMappingException:由于输入结束,没有要映射的内容,java,json,jackson,Java,Json,Jackson,我需要用JavaPOJO类映射一个JSON数组对象。 我这样写代码: // execute the client with get method InputStream inputStream = getMethod.getResponseBodyAsStream(); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream)); ObjectMapper objectMapp
// execute the client with get method
InputStream inputStream = getMethod.getResponseBodyAsStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
ObjectMapper objectMapper = new ObjectMapper();
JsonFactory jsonFactory = new JsonFactory();
List<OwnerDetail> owners = new ArrayList<>();
JsonParser jsonParser = jsonFactory.createJsonParser(inputStream);
if (jsonParser.nextToken() != null && jsonParser.)
{ // end-of-input
owners = objectMapper.readValue(bufferedReader, TypeFactory.defaultInstance().constructCollectionType(List.class, OwnerDetail.class));
}
if (parser.isExpectedStartArrayToken()) {
owners = mapper.readValue(parser, mapper.getTypeFactory().constructCollectionType(List.class, OwnerDetail.class));
}
任何帮助都将不胜感激。谢谢。读取响应后,将使用响应中的数据。 如果您的代码在拦截器中,您可以再次尝试创建响应并返回如下所示:
Request request = chain.request();
Response originalResponse = chain.proceed(request);
final ResponseBody original = originalResponse.body();
// if(request.url().toString().equalsIgnoreCase(string)){
if (originalResponse.code() == HttpURLConnection.HTTP_OK) {
try {
String response = originalResponse.body().string();
JSONObject mainObject = new JSONObject(response);
// your mapping - manipulation code here.
originalResponse = originalResponse.newBuilder()
.header("Cache-Control", "max-age=60")
.body(ResponseBody.create(original.contentType(),
mainObject.toString().getBytes()))
.build();
} catch (JSONException | IOException e) {
e.printStackTrace();
}
}
return originalResponse;
这里再次创建并返回响应
请务必让我知道任何更新。inputStream和bufferedReader的使用似乎都是错误的。如果已经为输入创建了JsonParser,那么最好继续将其用于对象映射。缓冲读取器急切地从流中读取所有内容可能会出现问题,而JSON解析器无法读取任何内容 在
if
条件下,代码中似乎还缺少一个部分
大概是这样的:
// execute the client with get method
InputStream inputStream = getMethod.getResponseBodyAsStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
ObjectMapper objectMapper = new ObjectMapper();
JsonFactory jsonFactory = new JsonFactory();
List<OwnerDetail> owners = new ArrayList<>();
JsonParser jsonParser = jsonFactory.createJsonParser(inputStream);
if (jsonParser.nextToken() != null && jsonParser.)
{ // end-of-input
owners = objectMapper.readValue(bufferedReader, TypeFactory.defaultInstance().constructCollectionType(List.class, OwnerDetail.class));
}
if (parser.isExpectedStartArrayToken()) {
owners = mapper.readValue(parser, mapper.getTypeFactory().constructCollectionType(List.class, OwnerDetail.class));
}
附加说明:
- 在传递给Jackson之前,建议不要在缓冲/解码(InputStreamReader)中包装流,因为Jackson的解析器已经对这个过程进行了大量优化
- 实际上,在BufferedReader中包装InputStreamReader实际上总是多余的,因为InputStreamReader会缓冲内容
- TypeFactory和JsonFactory都可以从ObjectMapper实例获得
- 无需将所有者初始化为一个空列表,该列表无论如何都会被覆盖——在不初始化的情况下声明它,并仅在必要时使用
设置默认值else
OutputStreamWriter
来反序列化您的响应
OutputStreamWriter wr=新的OutputStreamWriter(con.getOutputStream())代码>
wr.write(auth.toString())代码>
wr.flush()代码>