实现多图片上传加上多参数上传

@SuppressWarnings("rawtypes")
    public static String formUpload(String urlStr, Map<String, String> textMap,
                                   String [] fileMap,String contentType) {
        String res = "";
        sun.net.www.protocol.http.HttpURLConnection conn = null;
        // boundary就是request头和上传文件内容的分隔符
        String BOUNDARY = "---------------------------123821742118716";
        try {
            URL url = new URL(urlStr);
            conn = (sun.net.www.protocol.http.HttpURLConnection) url.openConnection();
            conn.setConnectTimeout(5000);
            conn.setReadTimeout(30000);
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Connection", "Keep-Alive");
            conn.setRequestProperty("User-Agent",
                    "Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.6)");
            conn.setRequestProperty("Content-Type",
                    "multipart/form-data; boundary=" + BOUNDARY);
            OutputStream out = new DataOutputStream(conn.getOutputStream());
            // text
            if (textMap != null) {
                StringBuffer strBuf = new StringBuffer();
                Iterator iter = textMap.entrySet().iterator();
                while (iter.hasNext()) {
                    Map.Entry entry = (Map.Entry) iter.next();
                    String inputName = (String) entry.getKey();
                    String inputValue = (String) entry.getValue();
                    if (inputValue == null) {
                        continue;
                    }
                    strBuf.append("\r\n").append("--").append(BOUNDARY)
                            .append("\r\n");
                    strBuf.append("Content-Disposition: form-data; name=\""
                            + inputName + "\"\r\n\r\n");
                    strBuf.append(inputValue);
                }
                out.write(strBuf.toString().getBytes());
            }
            // file
            if (fileMap != null) {
                for (int i = 0; i <fileMap.length ; i++) {
                    File file = new File(fileMap[i]);
                    String filename = file.getName();
                    //没有传入文件类型，同时根据文件获取不到类型，默认采用application/octet-stream
                    contentType = new MimetypesFileTypeMap().getContentType(file);
                    //contentType非空采用filename匹配默认的图片类型
                    if(!"".equals(contentType)){
                        if (filename.endsWith(".png")) {
                            contentType = "image/png";
                        }else if (filename.endsWith(".jpg") || filename.endsWith(".jpeg") || filename.endsWith(".jpe")) {
                            contentType = "image/jpeg";
                        }else if (filename.endsWith(".gif")) {
                            contentType = "image/gif";
                        }else if (filename.endsWith(".ico")) {
                            contentType = "image/image/x-icon";
                        }
                    }
                    if (contentType == null || "".equals(contentType)) {
                        contentType = "application/octet-stream";
                    }
                    StringBuffer strBuf = new StringBuffer();
                    strBuf.append("\r\n").append("--").append(BOUNDARY)
                            .append("\r\n");
                    strBuf.append("Content-Disposition: form-data; name=\""
                            + "pictures" + "\"; filename=\"" + filename
                            + "\"\r\n");
                    strBuf.append("Content-Type:" + contentType + "\r\n\r\n");
                    out.write(strBuf.toString().getBytes());
                    DataInputStream in = new DataInputStream(
                            new FileInputStream(file));
                    int bytes = 0;
                    byte[] bufferOut = new byte[1024];
                    while ((bytes = in.read(bufferOut)) != -1) {
                        out.write(bufferOut, 0, bytes);
                    }
                    in.close();
                }
          }
            byte[] endData = ("\r\n--" + BOUNDARY + "--\r\n").getBytes();
            out.write(endData);
            out.flush();
            out.close();
            // 读取返回数据
            StringBuffer strBuf = new StringBuffer();
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    conn.getInputStream()));
            String line = null;
            while ((line = reader.readLine()) != null) {
                strBuf.append(line).append("\n");
            }
            res = strBuf.toString();
            reader.close();
            reader = null;
        } catch (Exception e) {
            System.out.println("发送POST请求出错。" + urlStr);
            e.printStackTrace();
        } finally {
            if (conn != null) {
                conn.disconnect();
                conn = null;
            }
        }
        return res;
    }

public static void main(String[] args) throws Exception {
        String uri ="接口....";
        Map<String, String> map = new HashMap<>();
       map.put("key", "测试单号");
       map.put("title", "测试任务");
       //当前时间
       map.put("createTime", TimeUtils.currentTime());
       //当前时间往后延长num天数
       map.put("limitTime", TimeUtils.plusDay(5));
       map.put("reachId", "12568");
       //调用百度地图api获取到的经纬度，为了方便测试直接传了
       map.put("point", "POINT(11.11111 12.22222)");
       map.put("desc", "测试任务");
       map.put("content", "测试内容");
       String[] file ={"F:\\xx\\141f74027edd0462867bfad0cb530e45.jpg","F:\\xx\\50097c4f7e180741919337ba1244ceb6.jpg","F:\\xx\\tfa.jpg"};
      //上传的图片...
       String contentType="image/jpg";
       String s1 = formUpload(uri, map, file,contentType);
       System.out.println(s1);
   }