SpringBoot实现文件上传

用SpringBoot实现服务器，然后用java和html5实现客户端进行上传测试。

一、服务器端接口程序。为省事就在controller中写了，正式的程序我喜欢放在service这一层进行处理调用。

@RestController@RequestMapping("/file")public class FileController {    /**     * 单文件上传     *     * @param file     * @param request     * @return     */    @PostMapping("/upload")    @ResponseBody    public String upload(@RequestParam("file") MultipartFile file, HttpServletRequest request) {        if (!file.isEmpty()) {            String saveFileName = file.getOriginalFilename();            File saveFile = new File(request.getSession().getServletContext().getRealPath("/upload/") + saveFileName);            if (!saveFile.getParentFile().exists()) {                saveFile.getParentFile().mkdirs();            }            try {                BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(saveFile));                out.write(file.getBytes());                out.flush();                out.close();                return ResultUtils.buildResult(saveFile.getName() + " 上传成功");            } catch (FileNotFoundException e) {                e.printStackTrace();                return ResultUtils.buildResult("上传失败," + e.getMessage());            } catch (IOException e) {                e.printStackTrace();                return ResultUtils.buildResult("上传失败," + e.getMessage());            }        } else {            return ResultUtils.buildResult("上传失败，因为文件为空.");        }    }    /**     * 多文件上传     *     * @param request     * @return     */    @PostMapping("/uploadFiles")    @ResponseBody    public String uploadFiles(HttpServletRequest request) throws IOException {        File savePath = new File(request.getSession().getServletContext().getRealPath("/upload/"));        if (!savePath.exists()) {            savePath.mkdirs();        }        List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");        MultipartFile file = null;        BufferedOutputStream stream = null;        for (int i = 0; i < files.size(); ++i) {            file = files.get(i);            if (!file.isEmpty()) {                try {                    byte[] bytes = file.getBytes();                    File saveFile = new File(savePath, file.getOriginalFilename());                    stream = new BufferedOutputStream(new FileOutputStream(saveFile));                    stream.write(bytes);                    stream.close();                } catch (Exception e) {                    if (stream != null) {                        stream.close();                        stream = null;                    }                    return "第 " + i + " 个文件上传有错误" + e.getMessage();                }            } else {                return "第 " + i + " 个文件为空";            }        }        return "所有文件上传成功";    }}

但是大于1MB的文件上传时会提示出错的，所以要进行设置。添加一个配置文件就可以了。

@Configurationpublic class FileUploadConfig {    @Bean    public MultipartConfigElement multipartConfigElement() {        MultipartConfigFactory factory = new MultipartConfigFactory();        factory.setMaxFileSize("100MB");         factory.setMaxRequestSize("100MB");        return factory.createMultipartConfig();    }}

也可以在application.properties中加入这两句：

spring.http.multipart.maxFileSize=100Mbspring.http.multipart.maxRequestSize=100Mb

二者选其一即可。

2.java客户端测试程序，Android端也是如此，我是用retrofit2框架，以下是三部分代码：

接口：

public interface TestService {    //文件上传    @Multipart    @POST("upload")    Call<NetResult<Object>> upload(@Part MultipartBody.Part part);}

API部分：

public class TestApi extends NetApi {    private static String BASE_URL = "http://192.168.1.101:8080/springbootdemo/file/";    private static TestService service = NetClient.getRetrofit(BASE_URL).create(TestService.class);        //文件上传    public static void upload(File file, NetCallback<Object> callback) {        RequestBody body = RequestBody.create(MediaType.parse("multipart/form-data"), file);        MultipartBody.Part part = MultipartBody.Part.createFormData("file", file.getName(), body);        Call call = service.upload(part);        call.enqueue(callback);        NetManager.addRequest(call);    }}

测试调用：

public class Test {    public static void main(String[] args) {        String filePath = "E://被遗忘的时光.ape";        File file = new File(filePath);        NetCallback<Object> callback = new NetCallback<Object>() {            @Override            protected void onComplete(NetResponse<Object> netResponse) {            }        };        TestApi.upload(file, callback);    }}

测试成功上传！！！

三、HTML5页面单文件上传和多文件上传

<!DOCTYPE html><html><head lang="en">    <meta charset="UTF-8">    <title></title></head><body><form action="http://192.168.1.101:8080/springbootdemo/file/upload"      method="post"      enctype="multipart/form-data">    文件:<input type="file" name="file"/>    <input type="submit" value="上传"/></form></body></html>

测试成功!!!!!!!!!!!!!!!!!!!!!!!