java 实现Http请求

/**
 * 使用HttpClient4.5 post提交multipart/form-data数据实现多文件上传
 * @param url 请求地址
 * @param multipartFiles post提交的文件列表
 * @param fileParName fileKey
 * @param params 附带的文本参数
 * @param timeout 请求超时时间(毫秒)
 * @return
 * @author lingtong`
 * @date 2019年1月21日 上午11:36:15
 */
public static Map<String, String> httpPostRequest2(String url, List<MultipartFile> multipartFiles, String fileParName,
                                                   Map<String, Object> params, int timeout) {
    Map<String, String> resultMap = new HashMap<String, String>();
    CloseableHttpClient httpClient = HttpClients.createDefault();
    String result = "";
    try {
        HttpPost httpPost = new HttpPost(url);
        httpPost.setHeader("sign","86358999");
        MultipartEntityBuilder builder = MultipartEntityBuilder.create();
        builder.setCharset(java.nio.charset.Charset.forName("UTF-8"));
        builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
        String fileName = null;
        MultipartFile multipartFile = null;
        if (multipartFiles != null){
            for (int i = 0; i < multipartFiles.size(); i++) {
                multipartFile = multipartFiles.get(i);
                fileName = multipartFile.getOriginalFilename();
                builder.addBinaryBody(fileParName, multipartFile.getInputStream(), ContentType.MULTIPART_FORM_DATA, fileName);// 文件流
            }
        }

        //决中文乱码
        ContentType contentType = ContentType.create(HTTP.PLAIN_TEXT_TYPE, HTTP.UTF_8);
        for (Map.Entry<String, Object> entry : params.entrySet()) {
            if(entry.getValue() == null)
                continue;
            // 类似浏览器表单提交，对应input的name和value
            builder.addTextBody(entry.getKey(), entry.getValue().toString(), contentType);
        }
        HttpEntity entity = builder.build();
        httpPost.setEntity(entity);
        HttpResponse response = httpClient.execute(httpPost);// 执行提交

        // 设置连接超时时间
        RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(timeout)
                .setConnectionRequestTimeout(timeout).setSocketTimeout(timeout).build();
        httpPost.setConfig(requestConfig);

        HttpEntity responseEntity = response.getEntity();
        resultMap.put("scode", String.valueOf(response.getStatusLine().getStatusCode()));
        resultMap.put("data", "");
        if (responseEntity != null) {
            // 将响应内容转换为字符串
            result = EntityUtils.toString(responseEntity, java.nio.charset.Charset.forName("UTF-8"));
            resultMap.put("data", result);

        }
    } catch (Exception e) {
        resultMap.put("scode", "error");
        resultMap.put("data", "HTTP请求出现异常: " + e.getMessage());

        Writer w = new StringWriter();
        e.printStackTrace(new PrintWriter(w));
        //logger.error("HTTP请求出现异常: " + w.toString());
        System.out.println("HTTP请求出现异常: " + w.toString());
    } finally {
        try {
            httpClient.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return resultMap;
}

public static void main(String[] args)throws Exception{
    Map<String, Object> data = new HashMap<>();
    /*data中请求需要的参数*/
    data.put("account", "szsdtjtfafa");//账号
    data.put("password", "Mima12345");//密码

    //导入需要上传的文件 
    File file = new File("C:\\Users\\Thinkpa\\Desktop\\161616.jpg");
    FileItem fileItem = dataFormat(file);
    MultipartFile multipartFile = new CommonsMultipartFile(fileItem);
    List<MultipartFile> list = new ArrayList();
    list.add(multipartFile);

    Map<String, String> resultDataMap = httpPostRequest2("xxx/noticeInterface/save",list, "files", data, -1);
    System.out.println("返回状态：========》"+resultDataMap.get("scode") + "==>data"+resultDataMap.get("data"));

}

public static FileItem dataFormat(File file)throws Exception{
    FileItem fileItem = new DiskFileItem("mm", Files.probeContentType(file.toPath()), false, file.getName(), (int) file.length(), file.getParentFile());
    try {
        InputStream input = new FileInputStream(file);
        OutputStream os = fileItem.getOutputStream();
        IOUtils.copy(input, os);
        //Or faster..
        IOUtils.copy(new FileInputStream(file), fileItem.getOutputStream());
    } catch (IOException ex) {
        //do something.
    }
    return  fileItem;
}