public Object beforeBodyWrite(Object body, MethodParameter returnType, MediaType selectedContentType,
                              Class<? extends HttpMessageConverter<?>> selectedConverterType, ServerHttpRequest request,
                              ServerHttpResponse response) {

    ResponseJSONP responseJsonp = returnType.getMethodAnnotation(ResponseJSONP.class);
    if(responseJsonp == null){
        responseJsonp = returnType.getContainingClass().getAnnotation(ResponseJSONP.class);
    }

    HttpServletRequest servletRequest = ((ServletServerHttpRequest) request).getServletRequest();
    String callbackMethodName = servletRequest.getParameter(responseJsonp.callback());

    if (!IOUtils.isValidJsonpQueryParam(callbackMethodName)) {
        if (logger.isDebugEnabled()) {
            logger.debug("Invalid jsonp parameter value:" + callbackMethodName);
        }
        callbackMethodName = null;
    }

    JSONPObject jsonpObject = new JSONPObject(callbackMethodName);
    jsonpObject.addParameter(body);
    beforeBodyWriteInternal(jsonpObject, selectedContentType, returnType, request, response);
    return jsonpObject;
}
 

@Override
protected void renderMergedOutputModel(Map<String, Object> model, //
                                       HttpServletRequest request, //
                                       HttpServletResponse response) throws Exception {
    Object value = filterModel(model);
    String jsonpParameterValue = getJsonpParameterValue(request);
    if(jsonpParameterValue != null) {
        JSONPObject jsonpObject = new JSONPObject(jsonpParameterValue);
        jsonpObject.addParameter(value);
        value = jsonpObject;
    }

    ByteArrayOutputStream outnew = new ByteArrayOutputStream();

    int len = JSON.writeJSONString(outnew, //
            fastJsonConfig.getCharset(), //
            value, //
            fastJsonConfig.getSerializeConfig(), //
            fastJsonConfig.getSerializeFilters(), //
            fastJsonConfig.getDateFormat(), //
            JSON.DEFAULT_GENERATE_FEATURE, //
            fastJsonConfig.getSerializerFeatures());

    if (this.updateContentLength) {
        // Write content length (determined via byte array).
        response.setContentLength(len);
    }

    // Flush byte array to servlet output stream.
    ServletOutputStream out = response.getOutputStream();
    outnew.writeTo(out);
    outnew.close();
    out.flush();
}
 

@Override
protected void writeInternal(Object object, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {
    try (ByteArrayOutputStream outnew = new ByteArrayOutputStream()) {
        HttpHeaders headers = outputMessage.getHeaders();

        //获取全局配置的filter
        SerializeFilter[] globalFilters = getFastJsonConfig().getSerializeFilters();
        List<SerializeFilter> allFilters = new ArrayList<>(Arrays.asList(globalFilters));

        boolean isJsonp = false;
        Object value = strangeCodeForJackson(object);

        if (value instanceof FastJsonContainer) {
            FastJsonContainer fastJsonContainer = (FastJsonContainer) value;
            PropertyPreFilters filters = fastJsonContainer.getFilters();
            allFilters.addAll(filters.getFilters());
            value = fastJsonContainer.getValue();
        }

        if (value instanceof MappingFastJsonValue) {
            isJsonp = true;
            value = ((MappingFastJsonValue) value).getValue();
        } else if (value instanceof JSONPObject) {
            isJsonp = true;
        }


        int len = writePrefix(outnew, object);
        len += JSON.writeJSONString(outnew, //
                getFastJsonConfig().getCharset(), //
                value, //
                getFastJsonConfig().getSerializeConfig(), //
                allFilters.toArray(new SerializeFilter[allFilters.size()]),
                getFastJsonConfig().getDateFormat(), //
                JSON.DEFAULT_GENERATE_FEATURE, //
                getFastJsonConfig().getSerializerFeatures());
        len += writeSuffix(outnew, object);

        if (isJsonp) {
            headers.setContentType(APPLICATION_JAVASCRIPT);
        }
        if (getFastJsonConfig().isWriteContentLength()) {
            headers.setContentLength(len);
        }

        headers.set("carrera_logid", RequestContext.getLogId());
        RequestContext.sendJsonResponse(outnew.toString());

        outnew.writeTo(outputMessage.getBody());

    } catch (JSONException ex) {
        throw new HttpMessageNotWritableException("Could not write JSON: " + ex.getMessage(), ex);
    }
}
 

@Override
protected void writeInternal(Object object, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {
    try (ByteArrayOutputStream outnew = new ByteArrayOutputStream()) {
        HttpHeaders headers = outputMessage.getHeaders();

        //获取全局配置的filter
        SerializeFilter[] globalFilters = getFastJsonConfig().getSerializeFilters();
        List<SerializeFilter> allFilters = new ArrayList<>(Arrays.asList(globalFilters));

        boolean isJsonp = false;
        Object value = strangeCodeForJackson(object);

        if (value instanceof FastJsonContainer) {
            FastJsonContainer fastJsonContainer = (FastJsonContainer) value;
            PropertyPreFilters filters = fastJsonContainer.getFilters();
            allFilters.addAll(filters.getFilters());
            value = fastJsonContainer.getValue();
        }

        if (value instanceof MappingFastJsonValue) {
            isJsonp = true;
            value = ((MappingFastJsonValue) value).getValue();
        } else if (value instanceof JSONPObject) {
            isJsonp = true;
        }


        int len = writePrefix(outnew, object);
        len += JSON.writeJSONString(outnew, //
                getFastJsonConfig().getCharset(), //
                value, //
                getFastJsonConfig().getSerializeConfig(), //
                allFilters.toArray(new SerializeFilter[allFilters.size()]),
                getFastJsonConfig().getDateFormat(), //
                JSON.DEFAULT_GENERATE_FEATURE, //
                getFastJsonConfig().getSerializerFeatures());
        len += writeSuffix(outnew, object);

        if (isJsonp) {
            headers.setContentType(APPLICATION_JAVASCRIPT);
        }
        if (getFastJsonConfig().isWriteContentLength()) {
            headers.setContentLength(len);
        }

        headers.set("carrera_logid", RequestContext.getLogId());
        RequestContext.sendJsonResponse(outnew.toString());

        outnew.writeTo(outputMessage.getBody());

    } catch (JSONException ex) {
        throw new HttpMessageNotWritableException("Could not write JSON: " + ex.getMessage(), ex);
    }
}
 

public <T> T deserialze(DefaultJSONParser parser, Type type, Object fieldName) {
    JSONLexerBase lexer = (JSONLexerBase) parser.getLexer();

    SymbolTable symbolTable = parser.getSymbolTable();

    String funcName = lexer.scanSymbolUnQuoted(symbolTable);
    lexer.nextToken();

    int tok = lexer.token();

    if (tok == JSONToken.DOT) {
        String name = lexer.scanSymbolUnQuoted(parser.getSymbolTable());
        funcName += ".";
        funcName += name;
        lexer.nextToken();
        tok = lexer.token();
    }

    JSONPObject jsonp = new JSONPObject(funcName);

    if (tok != JSONToken.LPAREN) {
        throw new JSONException("illegal jsonp : " + lexer.info());
    }
    lexer.nextToken();
    for (;;) {
        Object arg = parser.parse();
        jsonp.addParameter(arg);

        tok = lexer.token();
        if (tok == JSONToken.COMMA) {
            lexer.nextToken();
        } else if (tok == JSONToken.RPAREN) {
            lexer.nextToken();
            break;
        } else {
            throw new JSONException("illegal jsonp : " + lexer.info());
        }
     }
    tok = lexer.token();
    if (tok == JSONToken.SEMI) {
        lexer.nextToken();
    }

    return (T) jsonp;
}
 

@Override
protected void writeInternal(Object object, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {

    ByteArrayOutputStream outnew = new ByteArrayOutputStream();
    try {
        HttpHeaders headers = outputMessage.getHeaders();

        //获取全局配置的filter
        SerializeFilter[] globalFilters = fastJsonConfig.getSerializeFilters();
        List<SerializeFilter> allFilters = new ArrayList<SerializeFilter>(Arrays.asList(globalFilters));

        boolean isJsonp = false;

        //不知道为什么会有这行代码， 但是为了保持和原来的行为一致，还是保留下来
        Object value = strangeCodeForJackson(object);

        if (value instanceof FastJsonContainer) {
            FastJsonContainer fastJsonContainer = (FastJsonContainer) value;
            PropertyPreFilters filters = fastJsonContainer.getFilters();
            allFilters.addAll(filters.getFilters());
            value = fastJsonContainer.getValue();
        }

        //revise 2017-10-23 ,
        // 保持原有的MappingFastJsonValue对象的contentType不做修改 保持旧版兼容。
        // 但是新的JSONPObject将返回标准的contentType：application/javascript ，不对是否有function进行判断
        if (value instanceof MappingFastJsonValue) {
            if(!StringUtils.isEmpty(((MappingFastJsonValue) value).getJsonpFunction())){
                isJsonp = true;
            }
        } else if (value instanceof JSONPObject) {
            isJsonp = true;
        }


        int len = JSON.writeJSONString(outnew, //
                fastJsonConfig.getCharset(), //
                value, //
                fastJsonConfig.getSerializeConfig(), //
                //fastJsonConfig.getSerializeFilters(), //
                allFilters.toArray(new SerializeFilter[allFilters.size()]),
                fastJsonConfig.getDateFormat(), //
                JSON.DEFAULT_GENERATE_FEATURE, //
                fastJsonConfig.getSerializerFeatures());

        if (isJsonp) {
            headers.setContentType(APPLICATION_JAVASCRIPT);
        }

        if (fastJsonConfig.isWriteContentLength()) {
            headers.setContentLength(len);
        }

        outnew.writeTo(outputMessage.getBody());

    } catch (JSONException ex) {
        throw new HttpMessageNotWritableException("Could not write JSON: " + ex.getMessage(), ex);
    } finally {
        outnew.close();
    }
}
 

public void beforeBodyWriteInternal(JSONPObject jsonpObject, MediaType contentType,
                                    MethodParameter returnType, ServerHttpRequest request, ServerHttpResponse response) {
    //MediaType contentTypeToUse = getContentType(contentType, request, response);
    //response.getHeaders().setContentType(contentTypeToUse);
}