發送端：
/**
* 以流的方式
* 發送文件和json對象
*
* @return
*/
public static String doPostFileStreamAndJsonObj(String url, List<String> fileList, JSONObject json) {
String result = "";//請求返回參數
String jsonString = json.toJSONString();//獲得jsonstirng,或者toString都可以，只要是json格式，給了別人能解析成json就行
// System.out.println("================");
// System.out.println(xml);//可以打印出來瞅瞅
// System.out.println("================");
try {
//開始設置模擬請求的參數，額，不一個個介紹了，根據需要拿
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");
//這里模擬的是火狐瀏覽器，具體的可以f12看看請求的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");
//這里的content-type要設置成表單格式，模擬ajax的表單請求
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
// 指定流的大小，當內容達到這個值的時候就把流輸出
conn.setChunkedStreamingMode(10240000);
//定義輸出流，有什么數據要發送的，直接后面append就可以，記得轉成byte再append
OutputStream out = new DataOutputStream(conn.getOutputStream());
byte[] end_data = ("\r\n--" + boundary + "--\r\n").getBytes();// 定義最后數據分隔線
StringBuilder sb = new StringBuilder();
//添加form屬性
sb.append("--");
sb.append(boundary);
sb.append("\r\n");
//這里存放要傳輸的參數，name = xml
sb.append("Content-Disposition: form-data; name=\"JsonObj\"");
sb.append("\r\n\r\n");
//把要傳的json字符串放進來
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");
//這里的參數啥的是我項目里對方接收要用到的，具體的看你的項目怎樣的格式
sb.append("Content-Disposition: form-data;name=\"File"
+ "\";filename=\"" + file.getName() + "\"\r\n");
//這里拼接個fileName，方便后面用第一種方式接收（如果是純文件，不帶其他參數，就可以不用這個了，因為Multipart可以直接解析文件）
sb.append("FileName:"+ file.getName() + "\r\n");
//發送文件是以流的方式發送，所以這里的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()); // 多個文件時，二個文件之間加入這個
}
in.close();
}else{
System.out.println("沒有發現文件");
}
}
//發送流
out.write(end_data);
out.flush();
out.close();
// 定義BufferedReader輸入流來讀取URL的響應
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());//可以把結果打印出來瞅瞅
// System.out.println("================");
//后面可以對結果進行解析（如果返回的是格式化的數據的話）
} catch (Exception e) {
System.out.println("發送POST請求出現異常！" + e);
e.printStackTrace();
}
return result;
}
----------------------------------
發送端測試類
public static void main(String args[]) throws Exception {
//模擬流文件及參數上傳
String url = "http://127.0.0.1:8090/kty/test/receiveStream";
//文件列表，搞了三個本地文件
List<String> fileList = new ArrayList<>();
fileList.add("F:\\me\\photos\\動漫\\3ba39425fec1965f4d088d2f.bmp");
fileList.add("F:\\me\\photos\\動漫\\09b3970fd3f5cc65b1351da4.bmp");
fileList.add("F:\\me\\photos\\動漫\\89ff57d93cd1b72cd0164ec9.bmp");
//json字符串，模擬了一個，傳圖片名字吧
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("進來了");
try {
//獲取request里的所有部分
Collection<Part> parts = request.getParts();
for (Iterator<Part> iterator = parts.iterator(); iterator.hasNext(); ) {
Part part = iterator.next();
System.out.println("名稱========" + part.getName());
if ("JsonObj".equals(part.getName())) {
//解析json對象
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對象為=====" + json.toJSONString());
} else if ("File".equals(part.getName())) {
String fileName = "";
Long size = part.getSize();
//文件名的獲取，可以直接獲取header里定義好的FIleName（大部分沒有），或從Content-Disposition去剪切出來
// String head = part.getHeader("Content-Disposition");
// fileName = head.substring(head.indexOf("filename=")+ 10, head.lastIndexOf("\""));
fileName = part.getHeader("FileName");
System.out.println(fileName + size);
// //這里就是文件，文件流就可以直接寫入到文件了
// 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();
}
}
//如果嫌上面獲取文件的麻煩，用下面這個比較簡單，解析成multipartFile
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
//統計文件數
Integer fileCount = 0;
//請求里key為File的元素（即文件元素）
List<MultipartFile> 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 + "個文件");
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
}