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這期內(nèi)容當(dāng)中小編將會(huì)給大家?guī)?lái)有關(guān)怎么在Spring Cloud中使用FeignClient實(shí)現(xiàn)文件上傳功能,文章內(nèi)容豐富且以專業(yè)的角度為大家分析和敘述,閱讀完這篇文章希望大家可以有所收獲。
具體的使用方法是加入maven依賴
<dependency> <groupId>io.github.openfeign.form</groupId> <artifactId>feign-form-spring</artifactId> <version>3.2.2</version> </dependency> <dependency> <groupId>io.github.openfeign.form</groupId> <artifactId>feign-form</artifactId> <version>3.2.2</version> </dependency>
注入SpringFormEncoder類
@Bean @Primary @Scope("prototype") public Encoder multipartFormEncoder() { return new SpringFormEncoder(); }
FeignClient接口里方法參數(shù)是文件類型的要用@RequestPart注解,且要設(shè)置ContentType為multipart/form-data
@ResponseBody @RequestMapping(value = "/ctstestcase/updateTestCase", method = {RequestMethod.POST}, consumes = MediaType.MULTIPART_FORM_DATA_VALUE) Map<String, Object> updateTestCase(@RequestParam("testcaseId") String testcaseId, @RequestParam("name") String name, @RequestParam("assignId") String assignId, @RequestParam("areaId") String areaId, @RequestParam("state") Integer state, @RequestParam("iterationId") String iterationId,@RequestParam("priority") Integer priority, @RequestParam("moduleId") String moduleId, @RequestParam("executionType") Integer executionType, @RequestParam("summary") String summary, @RequestParam("tcsteps") String tcsteps, @RequestParam("relations") String relations,@RequestParam("attachments") String attachments, @RequestPart("files") MultipartFile[] files);
但遇到一個(gè)問(wèn)題,就是不支持文件數(shù)組類型,我看了源碼,發(fā)現(xiàn)源碼里底層是有對(duì)MultipartFile[]類型的支持的,源碼中有個(gè)類叫SpringManyMultipartFilesWriter,是專門針對(duì)文件數(shù)組類型進(jìn)行操作的,但是配置到項(xiàng)目里的SpringFormEncoder類里卻沒(méi)有對(duì)文件數(shù)組類型的判斷,以致不能支持文件數(shù)組的上傳.。
SpringManyMultipartFilesWriter源碼:
@FieldDefaults(level = PRIVATE, makeFinal = true) public class SpringManyMultipartFilesWriter extends AbstractWriter { SpringSingleMultipartFileWriter fileWriter = new SpringSingleMultipartFileWriter(); @Override public void write (Output output, String boundary, String key, Object value) throws Exception { if (value instanceof MultipartFile[]) { val files = (MultipartFile[]) value; for (val file : files) { fileWriter.write(output, boundary, key, file); } } else if (value instanceof Iterable) { val iterable = (Iterable<?>) value; for (val file : iterable) { fileWriter.write(output, boundary, key, file); } } } @Override public boolean isApplicable (Object value) { if (value == null) { return false; } if (value instanceof MultipartFile[]) { return true; } if (value instanceof Iterable) { val iterable = (Iterable<?>) value; val iterator = iterable.iterator(); if (iterator.hasNext() && iterator.next() instanceof MultipartFile) { return true; } } return false; }
SpringFormEncoder源碼:
public class SpringFormEncoder extends FormEncoder { /** * Constructor with the default Feign's encoder as a delegate. */ public SpringFormEncoder () { this(new Encoder.Default()); } /** * Constructor with specified delegate encoder. * * @param delegate delegate encoder, if this encoder couldn't encode object. */ public SpringFormEncoder (Encoder delegate) { super(delegate); val processor = (MultipartFormContentProcessor) getContentProcessor(MULTIPART); processor.addWriter(new SpringSingleMultipartFileWriter()); processor.addWriter(new SpringManyMultipartFilesWriter()); } @Override public void encode (Object object, Type bodyType, RequestTemplate template) throws EncodeException { if (!bodyType.equals(MultipartFile.class)) { super.encode(object, bodyType, template); return; } val file = (MultipartFile) object; val data = singletonMap(file.getName(), object); super.encode(data, MAP_STRING_WILDCARD, template); } }
從上面SpringFormEncoder的源碼上可以看到SpringFormEncoder類構(gòu)造時(shí)把SpringManyMultipartFilesWriter實(shí)例添加到了處理器列表里了,但是在encode方法里又只判斷了MultipartFile類型,沒(méi)有判斷數(shù)組類型,這就比較奇怪了,底層有對(duì)數(shù)組的支持但上層卻缺少了相應(yīng)判斷,而且在源碼里的test包里也沒(méi)有對(duì)文件數(shù)組類型的測(cè)試,難道只是encode方法里漏掉了?還是說(shuō)那個(gè)文件數(shù)組的支持有問(wèn)題?所以encode方法里才沒(méi)有加入對(duì)其的判斷?
于是我先試著對(duì)encode方法進(jìn)行擴(kuò)展加入對(duì)文件數(shù)組的判斷,應(yīng)該就可以支持文件數(shù)組的上傳了,于是把SpringFormEncoder類源碼復(fù)制出來(lái)重命名為FeignSpringFormEncoder,源碼如下:
public class FeignSpringFormEncoder extends FormEncoder { /** * Constructor with the default Feign's encoder as a delegate. */ public FeignSpringFormEncoder() { this(new Encoder.Default()); } /** * Constructor with specified delegate encoder. * * @param delegate delegate encoder, if this encoder couldn't encode object. */ public FeignSpringFormEncoder(Encoder delegate) { super(delegate); val processor = (MultipartFormContentProcessor) getContentProcessor(MULTIPART); processor.addWriter(new SpringSingleMultipartFileWriter()); processor.addWriter(new SpringManyMultipartFilesWriter()); } @Override public void encode(Object object, Type bodyType, RequestTemplate template) throws EncodeException { if (bodyType.equals(MultipartFile.class)) { val file = (MultipartFile) object; val data = singletonMap(file.getName(), object); super.encode(data, MAP_STRING_WILDCARD, template); return; } else if (bodyType.equals(MultipartFile[].class)) { val file = (MultipartFile[]) object; if(file != null) { val data = singletonMap(file.length == 0 ? "" : file[0].getName(), object); super.encode(data, MAP_STRING_WILDCARD, template); return; } } super.encode(object, bodyType, template); } }
上述就是小編為大家分享的怎么在Spring Cloud中使用FeignClient實(shí)現(xiàn)文件上傳功能了,如果剛好有類似的疑惑,不妨參照上述分析進(jìn)行理解。如果想知道更多相關(guān)知識(shí),歡迎關(guān)注億速云行業(yè)資訊頻道。
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