文件上傳參考文檔:http://blog.didispace.com/spring-cloud-starter-dalston-2-4/ 文件下載參考文檔:https://blog.csdn.net/aaronsimon/article/details/82710979 我的spring boot ...
文件上傳參考文檔:http://blog.didispace.com/spring-cloud-starter-dalston-2-4/
文件下載參考文檔:https://blog.csdn.net/aaronsimon/article/details/82710979
我的spring boot ,spring cloud 版本是:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.1.RELEASE</version>
<relativePath/>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Finchley.M9</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
服務調用方 feign文件下載需要配置的config:
import feign.codec.Encoder; import feign.form.spring.SpringFormEncoder; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class FeignMultipartSupportConfig { @Bean public Encoder feignFormEncoder() { return new SpringFormEncoder(); } }
對應的feign pom.xml需要引入
<!--feign upload file--> <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> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.3</version> </dependency>
服務調用方controller:
import com.yft.common.annotation.Log; import com.yft.sys.modules.test.fileclient.FileTestClient; import feign.Response; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.http.HttpHeaders; import org.springframework.http.HttpStatus; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.multipart.MultipartFile; import java.io.IOException; import java.io.InputStream; /** * feign 熔斷器示例 * * @author oKong */ @RestController @Slf4j public class FileController { @Autowired FileTestClient fileTestClient; @Log("文件上傳測試") @PostMapping("/upload") public Object upload(MultipartFile file) { log.info("使用feign調用服務,文件上傳"); return fileTestClient.upload(file); } @Log("文件下載測試") @RequestMapping(value = "/download", method = RequestMethod.GET) public ResponseEntity<byte[]> downFile() { log.info("使用feign調用服務 文件下載"); ResponseEntity<byte[]> result = null; InputStream inputStream = null; try { // feign文件下載 Response response = fileTestClient.download(); Response.Body body = response.body(); inputStream = body.asInputStream(); byte[] b = new byte[inputStream.available()]; inputStream.read(b); HttpHeaders heads = new HttpHeaders(); heads.add(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=lr.xls"); heads.add(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE); result = new ResponseEntity<byte[]>(b, heads, HttpStatus.OK); } catch (IOException e) { e.printStackTrace(); } finally { if (inputStream != null) { try { inputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } return result; } }
服務調用方feign client寫法(文件上傳主要是上面第一步配置,文件下載主要是返回的feign 的response):
import com.yft.sys.modules.ClientUrl; import com.yft.sys.modules.test.fileclient.impl.FileTestClientFallbackFactory; import feign.Response; import org.springframework.cloud.openfeign.FeignClient; import org.springframework.http.MediaType; import org.springframework.stereotype.Component; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.multipart.MultipartFile; /** * @author lr */ @FeignClient(name = ClientUrl.SYSTEM_NAME, fallbackFactory = FileTestClientFallbackFactory.class) @Component public interface FileTestClient { /** * 上傳文件測試 * * @return */ @PostMapping(value = ClientUrl.PRE_REQUEST_RUL + "/file/upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE) Object upload(MultipartFile file); /** * 下載文件測試 */ @RequestMapping(value = ClientUrl.PRE_REQUEST_RUL + "/file/download", method = RequestMethod.GET) Response download(); }
服務調用方 feign client 異常類:
import com.yft.sys.modules.test.fileclient.FileTestClient; import feign.Response; import feign.hystrix.FallbackFactory; import lombok.extern.slf4j.Slf4j; import org.springframework.stereotype.Component; import org.springframework.web.multipart.MultipartFile; /** * @author lr */ @Slf4j @Component public class FileTestClientFallbackFactory implements FallbackFactory<FileTestClient> { @Override public FileTestClient create(Throwable cause) { return new FileTestClient() { @Override public Object upload(MultipartFile file) { log.error("fallback; file upload reason was: " + cause.getMessage()); return null; } @Override public Response download() { log.error("fallback; file download reason was: " + cause.getMessage()); return null; } }; } }
服務提供方呢與原來寫法一樣,沒差別
@PostMapping(value = "upload", consumes = MediaType.MULTIPART_FORM_DATA_VALUE) public R upload(MultipartFile file) { try { String fileName = file.getOriginalFilename(); fileName = FileUtils.renameToUUID(fileName); String resPath = FileUtils.saveFile(file.getBytes(), filePath, fileName); // fileService.save(new FileDO() {{ // setCreateDate(new Date()); // setUrl("http://localhost:8004" + filePre + "/"+resPath); // setType(1); // }}); return R.ok().put("resPath", resPath); } catch (IOException e) { e.printStackTrace(); return R.error("文件上傳失敗"); } } @GetMapping("/download") public void downLoad(HttpServletResponse response) throws IOException {
//這裡示意下載excel文件,自己隨便下載點東西
/*我們先定義一個嵌套的List,List的元素也是一個List,內層的一個List代表一行數據, 每行都有4個單元格,最終list對象代表多行數據。*/ List<String> row1 = CollUtil.newArrayList("aa", "bb", "cc", "dd"); List<String> row2 = CollUtil.newArrayList("aa1", "bb1", "cc1", "dd1"); List<String> row3 = CollUtil.newArrayList("aa2", "bb2", "cc2", "dd2"); List<String> row4 = CollUtil.newArrayList("aa3", "bb3", "cc3", "dd3"); List<String> row5 = CollUtil.newArrayList("aa4", "bb4", "cc4", "dd4"); List<List<String>> rows = CollUtil.newArrayList(row1, row2, row3, row4, row5); // 然後我們創建ExcelWriter對象後寫出數據: // 通過工具類創建writer,預設創建xls格式 ExcelWriter writer = ExcelUtil.getWriter(); // 一次性寫出內容,使用預設樣式 writer.write(rows); //out為OutputStream,需要寫出到的目標流 //response為HttpServletResponse對象 response.setContentType("application/vnd.ms-excel;charset=utf-8"); //test.xls是彈出下載對話框的文件名,不能為中文,中文請自行編碼 response.setHeader("Content-Disposition", "attachment;filename=test.xls"); ServletOutputStream out = response.getOutputStream(); writer.flush(out); // 關閉writer,釋放記憶體 writer.close(); }
文件上傳配置yml
#上傳文件配置
app:
filePath: D:/uploaded_files/
pre: /files
@Configuration
public class WebConfig implements WebMvcConfigurer {
@Value("${app.filePath}")
String filePath;
@Value("${app.pre}")
String pre;
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler(pre + "/**").addResourceLocations("file:///" + filePath);
}
}
import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.channels.FileChannel; import java.util.UUID; public class FileUtils { public static String saveFile(byte[] file, String filePath, String fileName) { int random = (int) (Math.random() * 100 + 1); int random1 = (int) (Math.random() * 100 + 1); filePath = filePath + random + File.separator + random1 + File.separator; File targetFile = new File(filePath); if (!targetFile.exists()) { targetFile.mkdirs(); } FileOutputStream fileOutputStream = null; try { fileOutputStream = new FileOutputStream(filePath + fileName); FileChannel fileChannel = fileOutputStream.getChannel(); ByteBuffer buf = ByteBuffer.wrap(file); while (fileChannel.write(buf) != 0) { } } catch (Exception e) { } finally { if (fileOutputStream != null) { try { fileOutputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } //url return random + "/" + random1 + "/" + fileName; } public static boolean deleteFile(String fileName) { File file = new File(fileName); // 如果文件路徑所對應的文件存在,並且是一個文件,則直接刪除 if (file.exists() && file.isFile()) { if (file.delete()) { return true; } else { return false; } } else { return false; } } public static String renameToUUID(String fileName) { return UUID.randomUUID() + "." + fileName.substring(fileName.lastIndexOf(".") + 1); } }