使用HttpClient4实现文件上传请求的发送，服务器端以MultipartFile形式接收（附依赖jar包地址）

全栈程序员-用户IM • 2022年7月22日上午7:16 • 未分类

大家好，又见面了，我是你们的朋友全栈君。

今天学习使用了HttpClient4.2向服务端发送上传文件的post请求，由于服务器端采用MultipartFile形式接收，查询资料后决定使用HttpClient4.2实现，以下是实现代码（仅作测试使用）：

   public void testtaskPost()throws  Exception{
        HttpClient httpclient = new DefaultHttpClient();
        try {
            //新建一个httpclient Post 请求
            HttpPost httppost = new 
            HttpPost("http://127.0.0.1:8889/taskmanagement/task");
            //由于只是测试使用 这里的路径对应本地文件的物理路径
            FileBody bin = new FileBody(new File("E://2017//1.doc"));
            File myfile = new File("E://2017//1.doc");
            long size  = myfile.length();
            //向MultipartEntity添加必要的数据
            StringBody comment = new StringBody("1.doc", 
            Charset.forName("UTF-8"));
            MultipartEntity reqEntity = new MultipartEntity();
            reqEntity.addPart("file",bin);//file为请求后台的Fileupload参数
            reqEntity.addPart("filename",comment);//请求后台Fileupload的参数
            httppost.setEntity(reqEntity);
            //这里是后台接收文件的接口需要的参数，根据接口文档需要放在http请求的请求头
            String taskid ="919894d9-ea5a-4f6a-8edd-b14ef3b6f104";
            httppost.setHeader("task-id",taskid);
            String fileid = UUID.randomUUID().toString();
            httppost.setHeader("file-id",fileid);
            httppost.setHeader("file-name","1.doc");
            httppost.setHeader("file-size",String.valueOf(size));
            httppost.setHeader("total", String.valueOf(1));
            httppost.setHeader("index",String.valueOf(1));

            HttpResponse response = httpclient.execute(httppost);
            int statusCode = response.getStatusLine().getStatusCode();
            if(statusCode == HttpStatus.SC_OK){
                System.out.println("服务器正常响应.....");
                HttpEntity resEntity = response.getEntity();
                System.out.println(
                //httpclient自带的工具类读取返回数据
                EntityUtils.toString(resEntity));
                System.out.println( resEntity.getContent());
                EntityUtils.consume( resEntity);
            }
        } catch (ParseException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                httpclient.getConnectionManager().shutdown();
            } catch (Exception ignore) {
            }
        }
    }