httpclient使用HttpPost发送multipart/form-data请求:

ゝ一世哀愁。 2024-03-23 15:30 49阅读 0赞

最近在使用httpClient使用multipart/form-data请求,这个过程极为恶心人,一共重要的2点:

*  核心代码1:Boundary不要忘了设置,这个是分隔符(随机生成字符串就行),可以自己百度下.
 *  核心代码2:ContentType记得设置,不然导致中文编码异常

public static String postHikOpenApiByForm(String urlMap,String: param) {
        
    
            CloseableHttpClient httpClient = getHttpsClient();
            try {
        
                HttpPost httpPost = new HttpPost(url);
                //[核心代码1.1]boundary分隔符随机生成
                String boundary = UUIDGenerator.generateUUIDWithOutSlash();
                //[核心代码1.2]分割符号别忘了设置到头里面的content_type
                httpPost.addHeader(HTTP.CONTENT_TYPE, "multipart/form-data; boundary=" + boundary);
                //[核心代码2.1]
                ContentType contentType = ContentType.create("multipart/form-data", StandardCharsets.UTF_8);
                
                
                MultipartEntityBuilder builder = MultipartEntityBuilder.create()
                        .setCharset(StandardCharsets.UTF_8)
                    //[核心代码1.3]这里别忘了设置分割符
                        .setBoundary(boundary)
                        ;
                if (!CollectionUtils.isEmpty(param)) {
        
                    //设置请求参数
                    for (String item : param.keySet()) {
        
                        //[核心代码2.2]这里请勿使用httpclient自带的contentType
                        builder.addTextBody(item,param.get(item).toString(),contentType);
                    }
                }
                //构建请求实体
                HttpEntity entity = builder.build();
                httpPost.setEntity(entity);
                CloseableHttpResponse response = httpClient.execute(httpPost);
                int responCode = response.getStatusLine().getStatusCode();
                String resultStr = EntityUtils.toString(response.getEntity(), "UTF-8");
                if (SUCCESS==responCode) {
        
                    return resultStr;
                }
                log.error("请求 失败,返回错误码:{},返回体:{}", response.getStatusLine().getStatusCode(), EntityUtils.toString(response.getEntity(), "UTF-8"));
                throw new BusinessException(ErrorCodeEnum.REQUEST_OPEN_API_EXCEPTION);
            } finally {
        
                try {
        
                    httpClient.close();
                } catch (Exception el) {
        
                    log.error("httpClient 释放异常", el);
                }
            }
        }

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