httpclient 多附件上传

多附件上传实例：

 /**
     * 多附件上传
     * @param host
     * @param uri
     * @param attachment 附件
     * @param param  body参数
     * @return
     */
    public String upload(String host, String uri, Map<String,String> attachment, Map<String, String> param) {
        logger.info("*****************request*****************");
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        MultipartEntityBuilder builder = MultipartEntityBuilder.create();;
        File file = null;
        InputStream inputStream = null;
        String url = host + uri;
        String rst = "";
        try {
            httpClient = HttpClients.createDefault();
            logger.info("请求路径： "+ url);
            HttpPost httpPost = new HttpPost(url);
            for(String fileName:attachment.keySet()){
                inputStream = this.getClass().getClassLoader().getResourceAsStream(attachment.get(fileName));  //获取resources下的资源文件
                file = new File(attachment.get(fileName));
                builder.addBinaryBody(fileName, inputStream, create("multipart/form-data", Consts.UTF_8), file.getName());
            }            for (Map.Entry<String, String> entry : param.entrySet()) {
                String key = entry.getKey();
                String value = entry.getValue();
                StringBody stringBody = new StringBody(value, create(
                        "text/plain", Consts.UTF_8));
                builder.addPart(key, stringBody);
                logger.info("请求参数："+key+":"+ value);
            }
            HttpEntity reqEntity = builder.build();
            httpPost.setEntity(reqEntity);
            // 发起请求 并返回请求的响应
            response = httpClient.execute(httpPost);
            // 获取响应对象
            HttpEntity resEntity = response.getEntity();
            if (resEntity != null) {
                // 打印响应内容
                rst = EntityUtils.toString(resEntity, Charset.forName("UTF-8")) ;
                logger.info("*****************response*****************");
                logger.info("响应结果： " +rst);
            }
            // 销毁
            EntityUtils.consume(resEntity);
            return rst;
        } catch (Exception e) {
            logger.info("出错啦： "+e.getMessage());
            e.printStackTrace();
            return "出错了";
        } finally {
            try {
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                if (httpClient != null) {
                    httpClient.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

　调用方法

public String uploadImage () throws Exception {
    Map<String, String> params = new HashMap<>();
    params.put("uploadType", "1");
    params.put("repayReason", "测试数据");
    Map<String, String> attachment= new HashMap<>();
    attachment.put("imageFile","picture/repayPic.jpg");  //该附件放在resources包下的picture包里面
    attachment.put("images","picture/repay.jpg");
    String rst = baseRequest.upload("http://xxxx.com","/web/upload", attachment, params);
    return rst;
}

请求类型表：查看

基本步骤：

1.设置上传的模式；
　　setMode(HttpMultipartMode mode)，其中mode主要有BROWSER_COMPATIBLE，RFC6532，STRICT三种，默认值是STRICT。
2.创建MultipartEntityBuilder对象，并添加需要上传的数据；
　a.利用MultipartEntityBuilder.create()来创建对象；
　b.addBinaryBody：以二进制的形式添加数据，可以添加File、InputStream、byte[]类型的数据。
　　addBinaryBody(String name, File file, ContentType contentType, String filename)
　　addBinaryBody(String name, InputStream stream, ContentType contentType, String filename)
　　addBinaryBody(String name, byte[] b, ContentType contentType, String filename)
　c.addTextBody：添加文本数据
　　addTextBody(String name, String text, ContentType contentType)
　d.addPart：以Key/Value的形式添加ContentBody类型的数据
　　addPart(String name, ContentBody contentBody)

MultipartEntityBuilder用法

2.MultipartEntityBuilder这个类主要用于创建HttpEntity。它的主要方法有：