HttpClient 发送文件流

使用Maven与HttpClient上传文件

最新推荐文章于 2025-09-20 09:35:14 发布

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本文介绍如何利用Maven依赖的Apache HttpClient组件，通过Java代码实现文件的HTTP POST上传，包括设置请求头、构建MultipartEntity，以及服务器端如何接收和处理上传的文件。

Maven依赖

<dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
            <version>4.3.1</version>
        </dependency>

        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.8</version>
        </dependency>

HttpPost 发送文件流

public void upload(String localFile, String filename){
        CloseableHttpClient httpClient = null;
        CloseableHttpResponse response = null;
        try {
            httpClient = HttpClients.createDefault();

            // 把一个普通参数和文件上传给下面这个地址 是一个servlet
            HttpPost httpPost = new HttpPost("http://127.0.0.1:8081/chapter01/upload/processUpload");

            // 把文件转换成流对象FileBody
            //FileBody bin = new FileBody(new File(localFile));
            InputStreamBody bin = new InputStreamBody(new FileInputStream(localFile), filename);

            StringBody userName = new StringBody("Scott", ContentType.create(
                    "text/plain", Consts.UTF_8));
            StringBody password = new StringBody("123456", ContentType.create(
                    "text/plain", Consts.UTF_8));
            StringBody filenamebody = new StringBody(filename, ContentType.create(
                    "text/plain", Consts.UTF_8));

            HttpEntity reqEntity = MultipartEntityBuilder.create()
                    .setCharset(Charset.forName("UTF-8"))
                    // 相当于<input type="file" name="file"/>
                    .addPart("file", bin)
                    // 相当于<input type="text" name="userName" value=userName>
                    .addPart("userName", userName)
                    .addPart("pass", password)
                    .addPart("filenamebody",filenamebody)
                    .build();

            httpPost.setEntity(reqEntity);

            // 发起请求 并返回请求的响应
            response = httpClient.execute(httpPost);

            System.out.println("The response value of token:" + response.getFirstHeader("token"));

            // 获取响应对象
            HttpEntity resEntity = response.getEntity();
            if (resEntity != null) {
                // 打印响应长度
                System.out.println("Response content length: " + resEntity.getContentLength());
                // 打印响应内容
                System.out.println(EntityUtils.toString(resEntity, Charset.forName("UTF-8")));
            }
            // 销毁
            EntityUtils.consume(resEntity);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            try {
                if(response != null){
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

            try {
                if(httpClient != null){
                    httpClient.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

服务器端接收文件流

@RequestMapping("/processUpload")
    public void processUpload(HttpServletRequest request, HttpServletResponse response, @RequestParam("filenamebody") String filenamebody, @RequestParam("file") MultipartFile file) {
        try {
            request.setCharacterEncoding("utf-8");
            response.setCharacterEncoding("utf-8");
            String name1 = file.getName();
            byte[] bytes = file.getBytes();
            //FileUtils.writeByteArrayToFile(new File("C:\\Users\\wangdongjiang\\Desktop\\wdj\\" + name1), bytes);
            response.addHeader("token", "hello");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }