HttpClient实现表单提交上传文件
本文实例为大家分享了HttpClient实现表单提交上传文件的具体代码,供大家参考,具体内容如下
需求:如何利用HttpClient,发起post请求,模拟表单提交,在后端上传文件?
上传文件接口:
/** * 文件上传测试接口 * @return */ @PostMapping("/upload") public Object uploadFileTest(@RequestParam("file") MultipartFile file, @RequestParam("file_name") String file_name, @RequestParam("file_code") String file_code) { System.out.println(file_name+","+file_code); return "OK"; }
启动后,可以通过postman进行调用,最后打印OK,表示接口可以调用通
然后就是正式编码环节了
首先引入需要的包:
<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpmime</artifactId> <version>4.5.3</version> </dependency>
编写main方法,直接发起调用
public static String httpClientUploadFile(String url, File file) { CloseableHttpClient httpClient = HttpClients.createDefault(); String result = ""; //每个post参数之间的分隔。随意设定,只要不会和其他的字符串重复即可。 String boundary = "--------------4585696313564699"; try { //文件名 String fileName = file.getName(); HttpPost httpPost = new HttpPost(url); //设置请求头 httpPost.setHeader("Content-Type", "multipart/form-data; boundary="+boundary); //HttpEntity builder MultipartEntityBuilder builder = MultipartEntityBuilder.create(); //字符编码 builder.setCharset(Charset.forName("UTF-8")); //模拟浏览器 builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE); builder.setContentType(ContentType.MULTIPART_FORM_DATA); //boundary builder.setBoundary(boundary); //multipart/form-data builder.addPart("file", new FileBody(file, ContentType.DEFAULT_BINARY)); // binary //builder.addBinaryBody("name=\"file\"; filename=\"mysql.docx\"", new FileInputStream(file), ContentType.MULTIPART_FORM_DATA, fileName);// 文件流 //其他参数 //builder.addTextBody("file_name", fileName, ContentType.create("text/plain", Consts.UTF_8)); builder.addTextBody("file_name", fileName, ContentType.MULTIPART_FORM_DATA); builder.addTextBody("file_code", "111111", ContentType.MULTIPART_FORM_DATA); //HttpEntity HttpEntity entity = builder.build(); httpPost.setEntity(entity); // 执行提交 HttpResponse response = httpClient.execute(httpPost); //响应 HttpEntity responseEntity = response.getEntity(); if (responseEntity != null) { // 将响应内容转换为字符串 result = EntityUtils.toString(responseEntity, Charset.forName("UTF-8")); } } catch (IOException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } finally { try { httpClient.close(); } catch (IOException e) { e.printStackTrace(); } } System.out.println("result" + result); return result; } //main 方法 public static void main(String[] args) { httpClientUploadFile("http://127.0.0.1:8080/test/tempA/upload",new File("e:/tmp/mysql.docx")); }
最后返回OK,调用成功
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
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