Java后端HttpClient Post提交文件流 及服务端接收文件流

客户端将文件转换为流发送：

依赖的包：

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.4</version>
</dependency>
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpmime</artifactId>
    <version>4.4</version>
</dependency>

import com.alibaba.fastjson.JSONObject;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

public static void main(String[] args) throws IOException {
        DataInputStream in = null;
        OutputStream out = null;
        HttpURLConnection conn = null;
        JSONObject resposeTxt = null;
        InputStream ins = null;
        ByteArrayOutputStream outStream = null;
        try {
//            URL url = new URL("http://192.168.3.11:8081/mes-boot-doc/test/fileupload?fileName=shafei.xls");
            URL url = new URL("http://localhost:8081/mes-boot-doc/test/fileupload?fileName=shafei.xls");

            conn = (HttpURLConnection) url.openConnection();
            // 发送POST请求必须设置如下两行
            conn.setDoOutput(true);
            conn.setUseCaches(false);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Type", "text/html");
            conn.setRequestProperty("Cache-Control", "no-cache");
            conn.setRequestProperty("Charsert", "UTF-8");
            conn.connect();
            conn.setConnectTimeout(10000);
            out = conn.getOutputStream();

            File file = new File("C:/Users/Dell/Desktop/print/shafei.xls");
            in = new DataInputStream(new FileInputStream(file));

            int bytes = 0;
            byte[] buffer = new byte[1024];
            while ((bytes = in.read(buffer)) != -1) {
                out.write(buffer, 0, bytes);
            }
            out.flush();

            // 返回流
            if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
                ins = conn.getInputStream();
                outStream = new ByteArrayOutputStream();
                byte[] data = new byte[1024];
                int count = -1;
                while ((count = ins.read(data, 0, 1024)) != -1) {
                    outStream.write(data, 0, count);
                }
                data = null;
                resposeTxt = JSONObject.parseObject(new String(outStream
                        .toByteArray(), "UTF-8"));
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (in != null) {
                in.close();
            }
            if (out != null) {
                out.close();
            }
            if (ins != null) {
                ins.close();
            }
            if (outStream != null) {
                outStream.close();
            }
            if (conn != null) {
                conn.disconnect();
            }
        }
    }

　　

服务端接收文件流生成文件：

@PostMapping("/fileupload")
    public String uploadFile(HttpServletRequest request,HttpServletResponse response) throws Exception{
        String fileName = request.getParameter("fileName");
        log.info("filename:"+fileName);
//        String fileName ="shafei.xls";
//        String fileFullPath = "C:/Users/Dell/Desktop/print/test/" + fileName;
        String fileFullPath = "/root/uploadfile/apache-tomcat-8.5.42/" + fileName;

        InputStream input = null;
        FileOutputStream fos = null;
        try {
            input = request.getInputStream();
            File file = new File("/root/uploadfile/apache-tomcat-8.5.42/");
            if(!file.exists()){
                file.mkdirs();
            }
            fos = new FileOutputStream(fileFullPath);
            int size = 0;
            byte[] buffer = new byte[1024];
            while ((size = input.read(buffer,0,1024)) != -1) {
                fos.write(buffer, 0, size);
            }

            //响应信息 json字符串格式
            Map<String,Object> responseMap = new HashMap<String,Object>();
            responseMap.put("flag", true);

            //生成响应的json字符串
            String jsonResponse = JSONObject.toJSONString(responseMap);
            sendResponse(jsonResponse,response);
        } catch (IOException e) {
            //响应信息 json字符串格式
            Map<String,Object> responseMap = new HashMap<String,Object>();
            responseMap.put("flag", false);
            responseMap.put("errorMsg", e.getMessage());
            String jsonResponse = JSONObject.toJSONString(responseMap);
            sendResponse(jsonResponse,response);
        } finally{
            if(input != null){
                input.close();
            }
            if(fos != null){
                fos.close();
            }
        }

        return null;
    }

    /**
     * 返回响应
     *
     * @throws Exception
     */
    private void sendResponse(String responseString,HttpServletResponse response) throws Exception {
        response.setContentType("application/json;charset=UTF-8");
        PrintWriter pw = null;
        try {
            pw = response.getWriter();
            pw.write(responseString);
            pw.flush();
        } finally {
            IOUtils.closeQuietly(pw);
        }
    }