发送端：

/**

* 以流的方式

* 发送文件和json对象

*

* @return

*/

public static String doPostFileStreamAndJsonObj(String url, List fileList, JSONObject json) {

String result = "";//请求返回参数

String jsonString = json.toJSONString();//获得jsonstirng,或者toString都可以，只要是json格式，给了别人能解析成json就行

// System.out.println("================");

// System.out.println(xml);//可以打印出来瞅瞅

// System.out.println("================");

try {

//开始设置模拟请求的参数，额，不一个个介绍了，根据需要拿

String boundary = "------WebKitFormBoundaryUey8ljRiiZqhZHBu";

URL u = new URL(url);

HttpURLConnection conn = (HttpURLConnection) u.openConnection();

conn.setDoOutput(true);

conn.setDoInput(true);

conn.setUseCaches(false);

conn.setRequestMethod("POST");

conn.setRequestProperty("connection", "Keep-Alive");

//这里模拟的是火狐浏览器，具体的可以f12看看请求的user-agent是什么

conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

conn.setRequestProperty("Charsert", "UTF-8");

//这里的content-type要设置成表单格式，模拟ajax的表单请求

conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

// 指定流的大小，当内容达到这个值的时候就把流输出

conn.setChunkedStreamingMode(10240000);

//定义输出流，有什么数据要发送的，直接后面append就可以，记得转成byte再append

OutputStream out = new DataOutputStream(conn.getOutputStream());

byte[] end_data = ("\r\n--" + boundary + "--\r\n").getBytes();// 定义最后数据分隔线

StringBuilder sb = new StringBuilder();

//添加form属性

sb.append("--");

sb.append(boundary);

sb.append("\r\n");

//这里存放要传输的参数，name = xml

sb.append("Content-Disposition: form-data; name=\"JsonObj\"");

sb.append("\r\n\r\n");

//把要传的json字符串放进来

sb.append(jsonString);

out.write(sb.toString().getBytes("utf-8"));

out.write("\r\n".getBytes("utf-8"));

int leng = fileList.size();

for (int i = 0; i < leng; i++) {

File file = new File(fileList.get(i));

if(file.exists()){

sb = new StringBuilder();

sb.append("--");

sb.append(boundary);

sb.append("\r\n");

//这里的参数啥的是我项目里对方接收要用到的，具体的看你的项目怎样的格式

sb.append("Content-Disposition: form-data;name=\"File"

+ "\";filename=\"" + file.getName() + "\"\r\n");

//这里拼接个fileName，方便后面用第一种方式接收(如果是纯文件，不带其他参数，就可以不用这个了，因为Multipart可以直接解析文件)

sb.append("FileName:"+ file.getName() + "\r\n");

//发送文件是以流的方式发送，所以这里的content-type是octet-stream流

sb.append("Content-Type:application/octet-stream\r\n\r\n");

byte[] data = sb.toString().getBytes();

out.write(data);

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);

}

int j = i + 1;

if (leng > 1 && j != leng) {

out.write("\r\n".getBytes()); // 多个文件时，二个文件之间加入这个

}

in.close();

}else{

System.out.println("没有发现文件");

}

}

//发送流

out.write(end_data);

out.flush();

out.close();

// 定义BufferedReader输入流来读取URL的响应

BufferedReader reader = new BufferedReader(new InputStreamReader(

conn.getInputStream()));

String line = "";

while ((line = reader.readLine()) != null) {

result += line;

}

// System.out.println("================");

// System.out.println(result.toString());//可以把结果打印出来瞅瞅

// System.out.println("================");

//后面可以对结果进行解析(如果返回的是格式化的数据的话)

} catch (Exception e) {

System.out.println("发送POST请求出现异常！" + e);

e.printStackTrace();

}

return result;

}

----------------------------------

发送端测试类

public static void main(String args[]) throws Exception {

//模拟流文件及参数上传

String url = "http://127.0.0.1:8090/kty/test/receiveStream";

//文件列表，搞了三个本地文件

List fileList = new ArrayList<>();

fileList.add("F:\\me\\photos\\动漫\\3ba39425fec1965f4d088d2f.bmp");

fileList.add("F:\\me\\photos\\动漫\\09b3970fd3f5cc65b1351da4.bmp");

fileList.add("F:\\me\\photos\\动漫\\89ff57d93cd1b72cd0164ec9.bmp");

//json字符串，模拟了一个，传图片名字吧

String jsonString = "{\n" +

" \"token\": \"stream data\", \n" +

" \"content\": [\n" +

" {\n" +

" \"id\": \"1\", \n" +

" \"name\": \"3ba39425fec1965f4d088d2f.bmp\"\n" +

" }, \n" +

" {\n" +

" \"id\": \"2\", \n" +

" \"name\": \"09b3970fd3f5cc65b1351da4.bmp\"\n" +

" }, \n" +

" {\n" +

" \"id\": \"3\", \n" +

" \"name\": \"89ff57d93cd1b72cd0164ec9.bmp\"\n" +

" }\n" +

" ]\n" +

"}";

JSONObject json = JSONObject.parseObject(jsonString);

doPostFileStreamAndJsonObj(url, fileList, json);

}

-----------------------------------------

接收端：

@RestController

@RequestMapping("/test")

//跨域注解

@CrossOrigin

public class TestController {

/**

* 接收流信息

*

* @param request

* @return

*/

@PostMapping("/receiveStream")

public String receiveStream(HttpServletRequest request) {

String result = "";

System.out.println("进来了");

try {

//获取request里的所有部分

Collection parts = request.getParts();

for (Iterator iterator = parts.iterator(); iterator.hasNext(); ) {

Part part = iterator.next();

System.out.println("名称========" + part.getName());

if ("JsonObj".equals(part.getName())) {

//解析json对象

BufferedReader reader = new BufferedReader(new InputStreamReader(part.getInputStream()));

String line = "";

String parseString = "";

while ((line = reader.readLine()) != null) {

parseString += line;

}

JSONObject json = JSONObject.parseObject(parseString);

System.out.println("接收到的json对象为=====" + json.toJSONString());

} else if ("File".equals(part.getName())) {

String fileName = "";

Long size = part.getSize();

//文件名的获取，可以直接获取header里定义好的FIleName(大部分没有)，或从Content-Disposition去剪切出来

// String head = part.getHeader("Content-Disposition");

// fileName = head.substring(head.indexOf("filename=")+ 10, head.lastIndexOf("\""));

fileName = part.getHeader("FileName");

System.out.println(fileName + size);

// //这里就是文件，文件流就可以直接写入到文件了

// InputStream inputStream = part.getInputStream();

// OutputStream outputStream = new FileOutputStream(fileName);

// int bytesWritten = 0;

// int byteCount = 0;

// byte[] bytes = new byte[1024];

// while ((byteCount = inputStream.read(bytes)) != -1) {

// outputStream.write(bytes, bytesWritten, byteCount);

// bytesWritten += byteCount;

// }

// inputStream.close();

// outputStream.close();

}

}

//如果嫌上面获取文件的麻烦，用下面这个比较简单，解析成multipartFile

MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;

//统计文件数

Integer fileCount = 0;

//请求里key为File的元素(即文件元素)

List list = multiRequest.getFiles("File");

while (fileCount < list.size()) {

MultipartFile file = list.get(fileCount);

System.out.println(file.getName());

System.out.println(file.getOriginalFilename());

System.out.println(file.getSize());

fileCount++;

}

System.out.println("共有" + fileCount + "个文件");

} catch (Exception e) {

e.printStackTrace();

}

return result;

}

}