httpclient模拟postman发送请求?

Question

问题描述

post方法调用远端接口,postman成功,自己通过java代码使用httpclient请求失败.
服务端不能够调试,不知道自己的错误 A server error occurred. Please contact the administrator

问题出现的环境背景及自己尝试过哪些方法

1. 首先需要将multipartfile转换为file
2. 构造的httpclient的entity中,使用的是MultipartEntity

相关代码

// 请把代码文本粘贴到下方（请勿用图片代替代码）

使用postman请求

postman构造请求成功

使用postman请求本地项目

header中设置了content-type 为form-data , 返回值为"A server error occurred. Please contact the administrator."

controller层

@RequestMapping(value = "/image", method = {RequestMethod.POST})

@ResponseBody
public String getSimilarImage( int num, MultipartFile image) {

    HashMap<String, String> params = new HashMap<>();
    params.put(ConstantUtil.NUM, String.valueOf(num));

    String result = null;
    File file = null;
    try {

        // 类型转换使用
        file = new File(image.getOriginalFilename());
        FileUtils.copyInputStreamToFile(image.getInputStream(),file);

        result = HttpClientUtil.doFilePost(gunsProperties.getSimilarImage(), file, params);
        System.out.println(result);
    } catch (Exception e) {
        logger.debug(e.getMessage());
    }

    File del = new File(file.toURI());
    del.delete();
    return result;

}

httpclient的工具类post方法

public static String doFilePost(String url, File file, HashMap<String, String> params) {

    CloseableHttpClient httpClient = null;
    CloseableHttpResponse response = null;
    String resultString = "";
    try {
        httpClient = HttpClients.createDefault();
        RequestConfig requestConfig = RequestConfig.custom().
                setConnectTimeout(2000000000).
                setConnectionRequestTimeout(2000000000).
                setSocketTimeout(2000000000).build();
        // 创建Http Post请求
        HttpPost httpPost = new HttpPost(url);
        httpPost.setHeader(ConstantUtil.CONTENT_TYPE, ConstantUtil.CONTENT_TYPE_VALUE);
        httpPost.setConfig(requestConfig);
        /*httpPost.setProtocolVersion(HttpVersion.HTTP_1_0);
        httpPost.addHeader(HTTP.CONN_DIRECTIVE, HTTP.CONN_CLOSE);*/

        // 设置Header信息
        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        builder.addPart("image", new FileBody(file));

        if (params != null && !params.isEmpty()) {
            for (Map.Entry<String, String> entry : params.entrySet()) {
                StringBody contentBody = new StringBody(entry.getValue(),
                        "text/plain", Charset.forName("UTF-8"));
                builder.addPart(entry.getKey(), contentBody);
            }
        }

        HttpEntity entity = builder.build();

        httpPost.setEntity(entity);
        response = httpClient.execute(httpPost);
        HttpEntity responseEntity = response.getEntity();
        if (responseEntity != null) {
            resultString = EntityUtils.toString(responseEntity, Charset.forName("UTF-8"));
        }
    } catch (Exception e) {
        logger.debug("超时异常,异常为{},异常信息为{}", e, e.getMessage());
        MsgResponse.failMessage(ConstantUtil.OUT_OF_DATE);
    } finally {
        try {
            if (response != null) {
                response.close();

            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    try {
        httpClient.close();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return resultString;
}

你期待的结果是什么？实际看到的错误信息又是什么？

期待和postman一样的结果,不知道中间哪个环节设置错误

Answer 1

原因是post中不能设置header,使用multipartfile的时候,已经默认进行了使用