文件上传、下载也是实际项目中会遇到的场景，本篇我们介绍下springcloud中如何使用feign进行文件上传与下载。
还是使用feign 进行http的调用。
一、Feign文件上传
服务提供方java代码：
/**
* 文件上传
* @param file 文件
* @param fileType
* @return
*/
@RequestMapping(method = RequestMethod.POST, value = "/uploadFile",
produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},
consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public String uploadFile(@RequestPart(value = "file") MultipartFile file,
@RequestParam(value = "fileType") String fileType,
HttpServletRequest request,HttpServletResponse response) {
System.out.println("fileType:"+fileType);
long size= file.getSize();
String contentType= file.getContentType();
String name = file.getName();
String orgFilename= file.getOriginalFilename();
System.out.println("size:"+size);
System.out.println("contentType:"+contentType);
System.out.println("name:"+name);
System.out.println("orgFilename:"+orgFilename);
String suffix = orgFilename.substring(orgFilename.lastIndexOf("."));//后缀
String uuid =UUID.randomUUID().toString().replaceAll("-", "").toUpperCase();
File dest = new File("f:/b13/"+uuid+suffix);
try {
file.transferTo(dest);
return dest.getCanonicalPath();//文件的绝对路径
} catch (IllegalStateException | IOException e) {
e.printStackTrace();
}
return "failure";
}
服务提供方Feign api接口：
@RequestMapping(method = RequestMethod.POST, value = "/uploadFile",
produces = {MediaType.APPLICATION_JSON_UTF8_VALUE},
consumes = MediaType.MULTIPART_FORM_DATA_VALUE)
public String uploadFile(@RequestPart(value = "file") MultipartFile file, @RequestParam(value = "fileType") String fileType);
服务消费方：
pom.xml
<!-- 引入文件feign文件上传依赖 --> <dependency> <groupId>io.github.openfeign.form</groupId> <artifactId>feign-form</artifactId> <version>3.0.3</version> </dependency> <dependency> <groupId>io.github.openfeign.form</groupId> <artifactId>feign-form-spring</artifactId> <version>3.0.3</version> </dependency>
java代码：
@Autowired
private UserProControllerApi userProControllerApi;
@ResponseBody
@RequestMapping("/user_uploadFile")
public Object user_uploadFile(HttpServletRequest request,HttpServletResponse response,
@RequestPart(value = "file") MultipartFile file, String fileType) {
System.out.println(fileType);
return userProControllerApi.uploadFile(file, fileType);
}
MultipartSupportConfig.java
@Configuration
public class MultipartSupportConfig {
@Autowired
private ObjectFactory<HttpMessageConverters> messageConverters;
@Bean
@Primary
@Scope("prototype")
public Encoder feignEncoder() {
return new SpringFormEncoder(new SpringEncoder(messageConverters));
}
@Bean
public feign.Logger.Level multipartLoggerLevel() {
return feign.Logger.Level.FULL;
}
}
二、Feign文件下载
服务提供方java代码：
/**
* 文件（二进制数据）下载
* @param fileType 文件类型
* @return
*/
@RequestMapping("/downloadFile")
public ResponseEntity<byte[]> downloadFile(String fileType,HttpServletRequest request ){
System.out.println(request.getParameter("fileType"));
System.out.println("参数fileType: "+fileType);
HttpHeaders headers = new HttpHeaders();
ResponseEntity<byte[]> entity = null;
InputStream in=null;
try {
in=new FileInputStream(new File("d:/myImg/001.png"));
byte[] bytes = new byte[in.available()];
String imageName="001.png";
//处理IE下载文件的中文名称乱码的问题
String header = request.getHeader("User-Agent").toUpperCase();
if (header.contains("MSIE") || header.contains("TRIDENT") || header.contains("EDGE")) {
imageName = URLEncoder.encode(imageName, "utf-8");
imageName = imageName.replace("+", "%20"); //IE下载文件名空格变+号问题
} else {
imageName = new String(imageName.getBytes(), "iso-8859-1");
}
in.read(bytes);
headers.add("Content-Disposition", "attachment;filename="+imageName);
entity = new ResponseEntity<byte[]>(bytes, headers, HttpStatus.OK);
} catch (Exception e) {
e.printStackTrace();
}finally {
if(in!=null) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return entity;
}
服务提供方feign api接口
@RequestMapping("/downloadFile")
public ResponseEntity<byte[]> downloadFile(@RequestParam(value = "fileType") String fileType
);
服务消费方
@ResponseBody
@RequestMapping("/user_downloadFile")
public Object user_downloadFile(HttpServletRequest request,HttpServletResponse response,
String fileType) {
ResponseEntity<byte[]> entity = userProControllerApi.downloadFile(fileType);
System.out.println( entity.getStatusCode());
return entity ;
}
注：实际项目中如果上传的文件太大，可以使用ftp服务器保存上传的文件，直接在controller端调用ftp接口即可。
如果下载的文件太大，则调用service端接口可返回一个ftp文件资源路径，然后在controller端调用ftp下载文件即可。
