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| |
| <h1 id="_1">文件上传开发指导</h1> |
| <h2 id="_2">服务提供者开发</h2> |
| <p>服务提供者可以采用Spring MVC 或者 Jax RS定义上传接口。</p> |
| <ul> |
| <li>采用Spring MVC</li> |
| </ul> |
| <pre><code class="language-java">@PostMapping(path = "/fileUpload", produces = MediaType.TEXT_PLAIN_VALUE, |
| consumes = MediaType.MULTIPART_FORM_DATA_VALUE) |
| public String fileUpload(@RequestPart(name = "file") MultipartFile file) |
| |
| @PostMapping(path = "/fileUpload", produces = MediaType.TEXT_PLAIN_VALUE, |
| consumes = MediaType.MULTIPART_FORM_DATA_VALUE) |
| public String fileUpload(@RequestPart(name = "file") Part file) |
| </code></pre> |
| <p>文件上传需要通过 @RequestPart 声明参数，参数类型支持 servlet 定义的 javax.servlet.http.Part 类型，也支持 |
| org.springframework.web.multipart.MultipartFile 类型，两种数据类型功能是一致的，MultipartFile 的底 |
| 层也是Part。 两种数据类型可以混合使用，比如第一个参数是Part，第二个参数是MultipartFile。 除了通过 |
| 定义多个参数的方式上传多个文件，也可以通过List或者数组的方式声明上传多个文件。</p> |
| <pre><code class="language-java">@PostMapping(path = "/fileUpload", produces = MediaType.TEXT_PLAIN_VALUE, |
| consumes = MediaType.MULTIPART_FORM_DATA_VALUE) |
| public String fileUpload(@RequestPart(name = "files") List<MultipartFile> files) |
| |
| @PostMapping(path = "/fileUpload", produces = MediaType.TEXT_PLAIN_VALUE, |
| consumes = MediaType.MULTIPART_FORM_DATA_VALUE) |
| public String fileUpload(@RequestPart(name = "files") MultipartFile[] files) |
| </code></pre> |
| <p>可以通过@RequestAttribute获取其他额外信息。</p> |
| <pre><code class="language-java">@PostMapping(path = "/fileUpload", produces = MediaType.TEXT_PLAIN_VALUE, |
| consumes = MediaType.MULTIPART_FORM_DATA_VALUE) |
| public String fileUpload(@RequestPart(name = "files") List<MultipartFile> files, |
| @RequestAttribute("message") String message) |
| </code></pre> |
| <p>Spring MVC方式定义上传接口还有其他很多方式，可以下载java-chassis源码，并查看UploadSpringmvcSchema里面的示例。</p> |
| <ul> |
| <li>采用Jax RS</li> |
| </ul> |
| <pre><code class="language-java">@Path("/fileUpload") |
| @POST |
| @Produces(MediaType.TEXT_PLAIN) |
| public String fileUpload(@FormParam(name = "file") Part file) |
| </code></pre> |
| <p>文件上传需要通过 @FormParam 声明参数，参数类型支持servlet定义的javax.servlet.http.Part类型。除了通过 |
| 定义多个参数的方式上传多个文件，也可以通过List或者数组的方式声明上传多个文件。</p> |
| <pre><code class="language-java">@Path("/fileUpload") |
| @POST |
| @Produces(MediaType.TEXT_PLAIN) |
| public String fileUpload(@FormParam(name = "files") List<Part> files) |
| |
| @Path("/fileUpload") |
| @POST |
| @Produces(MediaType.TEXT_PLAIN) |
| public String fileUpload(@FormParam(name = "files") Part[] files) |
| </code></pre> |
| <p>可以通过@FormParam获取其他额外信息。</p> |
| <pre><code class="language-java">@Path("/fileUpload") |
| @POST |
| @Produces(MediaType.TEXT_PLAIN) |
| public String fileUpload(@FormParam(name = "files") List<Part> files, |
| @FormParam("message") String message) |
| </code></pre> |
| <p>Jax RS 方式定义上传接口还有其他很多方式，可以下载java-chassis源码，并查看 UploadJaxrsSchema 里面的示例。</p> |
| <ul> |
| <li>业务开发注意事项</li> |
| </ul> |
| <p>通过MultipartFile或Part打开流后，记得关闭，否则上传的临时文件会无法删除，导致资源泄露和磁盘空间耗尽。</p> |
| <h2 id="_3">开发服务消费者</h2> |
| <p>可以使用透明 RPC </p> |
| <pre><code class="language-java"> interface UploadIntf { |
| String upload(File file); |
| } |
| |
| @RpcReference(microserviceName = "name", schemaId = "schema") |
| UploadIntf uploadIntf; |
| |
| String result = uploadIntf.upload(file); |
| </code></pre> |
| <p>或者 RestTemplate 进行文件上传。 </p> |
| <pre><code class="language-java">Map<String, Object> map = new HashMap<>(); |
| map.put("file", new FileSystemResource("a file path!")); |
| map.put("param1", "test"); |
| HttpHeaders headers = new HttpHeaders(); |
| headers.setContentType(org.springframework.http.MediaType.MULTIPART_FORM_DATA); |
| HttpEntity<Map<String, Object>> entity = new HttpEntity<>(map, headers); |
| |
| String reseult = template.postForObject(url, entity, String.class); |
| </code></pre> |
| <p>服务消费者不区分服务提供者是 Spring MVC 或者 Jax RS。 在使用透明 RPC 或者 RestTemplate 的时候， 可以使用如下类型 |
| 与服务提供者的文件对应： </p> |
| <ul> |
| <li>java.io.File</li> |
| <li>javax.servlet.http.Part</li> |
| <li>java.io.InputStream</li> |
| <li>org.springframework.core.io.Resource</li> |
| </ul> |
| <p>使用InputStream时，因为是流的方式，此时没有客户端文件名的概念，服务提供者获取到的文件名为null。 |
| 如果既要使用内存数据，又想让producer可以获取客户端文件名，可以使用resource类型，继承 |
| org.springframework.core.io.ByteArrayResource，且需要实现 getFilename 方法。</p> |
| <p>一样的，服务消费者还有其他灵活的使用方式，可以下载 java-chassis 代码查看调用示例。</p> |
| <h2 id="_4">使用浏览器上传文件</h2> |
| <p>浏览器通过Form的方式上传文件，下面是一个简单的HTML 和 JS 示例</p> |
| <pre><code class="language-html"><form id="upload_form" method="POST"> |
| <p> |
| File Name: <input type="file" name="fileName"/> |
| </p> |
| <p> |
| <input type="button" value="Upload" onclick="uploadAction()"> |
| </p> |
| </form> |
| </code></pre> |
| <p>事件处理：</p> |
| <pre><code>function uploadAction() { |
| var formData = new FormData(document.getElementById("upload_form")); |
| |
| $.ajax({ |
| type: 'POST', |
| url: "/api/file-service/upload", |
| data: formData, |
| processData:false, |
| contentType:false, |
| success: function (data) { |
| console.log(data); |
| var error = document.getElementById("error"); |
| error.textContent="Upload Successfully, file id=" + data; |
| error.hidden=false; |
| }, |
| error: function(data) { |
| console.log(data); |
| var error = document.getElementById("error"); |
| error.textContent="Upload failed"; |
| error.hidden=false; |
| }, |
| async: true |
| }); |
| </code></pre> |
| <h2 id="_5">配置参数说明</h2> |
| <table> |
| <thead> |
| <tr> |
| <th align="left">配置项</th> |
| <th align="left">默认值</th> |
| <th align="left">取值范围</th> |
| <th align="left">含义</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left">servicecomb.uploads.directory</td> |
| <td align="left">null</td> |
| <td align="left"></td> |
| <td align="left">上传的临时文件保存在哪个目录，<strong>默认值null表示不支持文件上传</strong></td> |
| </tr> |
| <tr> |
| <td align="left">servicecomb.uploads.maxSize</td> |
| <td align="left">-1</td> |
| <td align="left"></td> |
| <td align="left">http body的最大允许大小，单位byte，默认值-1表示无限制</td> |
| </tr> |
| </tbody> |
| </table> |
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