resstFul服务文件上传下载

上传

1. 在测试类中使用MocekMvc伪造上传文件请求

@RunWith(SpringRunner.class)
@SpringBootTest(classes = DemoApplication.class)
public class UserControllerTest {
    @Autowired
	private WebApplicationContext wac;
	private MockMvc mockMvc;
	@Before
	public void setup() {
		mockMvc = MockMvcBuilders.webAppContextSetup(wac).build();
	}
	@Test
	public void whenUploadSuccess() throws Exception {
		String result = mockMvc.perform(fileUpload("/file")
		        // 第一个参数为文件名,第二个参数为上传的原始名字,第四个参数为文件内容
				.file(new MockMultipartFile("file", "test.txt", "multipart/form-data", "hello upload".getBytes("UTF-8"))))
				.andExpect(status().isOk())
				.andReturn().getResponse().getContentAsString();
		System.out.println(result);
	}

2. 编写上传文件Controller层类

@RestController
@RequestMapping("/file")
public class FileController {
    private String folder = "F:\\doucuments\\idea\\spring-security\\demo\\src\\main\\resources";
	@PostMapping
	public FileInfo upload(MultipartFile file) throws Exception {
		System.out.println(file.getName());
		System.out.println(file.getOriginalFilename());
		System.out.println(file.getSize());
		File localFile = new File(folder, new Date().getTime() + ".txt");
		file.transferTo(localFile);
		return new FileInfo(localFile.getAbsolutePath());
	}
}

下载

controller层编写方法

@RestController
@RequestMapping("/file")
public class FileController {
	private String folder = "F:\\doucuments\\idea\\spring-security\\demo\\src\\main\\resources";
	@GetMapping("/{id}")
	public void download(@PathVariable String id, HttpServletRequest request, HttpServletResponse response) throws Exception {
		try (InputStream inputStream = new FileInputStream(new File(folder, id + ".txt"));
				OutputStream outputStream = response.getOutputStream();) {
			response.setContentType("application/x-download");
			response.addHeader("Content-Disposition", "attachment;filename=test.txt");
			IOUtils.copy(inputStream, outputStream);
			outputStream.flush();
		} 
	}
}