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| <a href="customized-tracing.html" class="md-nav__link"> |
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| 自定义调用链打点 |
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| <a href="reactive.html" class="md-nav__link"> |
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| Reactive |
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| <a href="dnsconfig.html" class="md-nav__link"> |
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| DNS自定义配置 |
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| <a href="proxy.html" class="md-nav__link"> |
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| 代理设置 |
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| <a href="report-framework-version.html" class="md-nav__link"> |
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| <a href="cross-app-invocation.html" class="md-nav__link"> |
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| 跨应用调用 |
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| <a href="produceprocess.html" class="md-nav__link"> |
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| 跨域资源共享(CORS) |
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| 获取熔断与实例隔离告警事件信息 |
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| <li class="md-nav__item"> |
| <a href="shutdown.html" class="md-nav__link"> |
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| 优雅停机 |
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| 异常处理 |
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| <a href="multienvironment.html" class="md-nav__link"> |
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| 微服务实例间多环境隔离 |
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| <a href="thread-model.html" class="md-nav__link"> |
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| 线程模型 |
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| <li class="md-nav__item"> |
| <a href="config-logs.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 配置日志 |
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| </ul> |
| </nav> |
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| <li class="md-nav__item md-nav__item--nested"> |
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| <span class="md-ellipsis"> |
| 多样化的通信协议功能 |
| </span> |
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| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_11_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_11"> |
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| 多样化的通信协议功能 |
| </label> |
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| <li class="md-nav__item"> |
| <a href="../transports/introduction.html" class="md-nav__link"> |
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| 多协议介绍 |
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| REST over HTTP(Vert.x) |
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| <a href="../transports/http2.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| REST over HTTP2(Vert.x) |
| </span> |
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| <a href="../transports/rest-over-servlet-embedded.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| REST over Servlet(Spring Boot Embedded) |
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| <a href="../transports/rest-over-servlet.html" class="md-nav__link"> |
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| REST over Servlet(WAR) |
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| <li class="md-nav__item"> |
| <a href="../transports/highway-rpc.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| Highway |
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| </ul> |
| </nav> |
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| <li class="md-nav__item md-nav__item--nested"> |
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| <span class="md-ellipsis"> |
| 多样化的服务注册与发现功能 |
| </span> |
| |
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| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_12_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_12"> |
| <span class="md-nav__icon md-icon"></span> |
| 多样化的服务注册与发现功能 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
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| <li class="md-nav__item"> |
| <a href="../registry/introduction.html" class="md-nav__link"> |
| |
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| <span class="md-ellipsis"> |
| 注册发现介绍 |
| </span> |
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| <li class="md-nav__item"> |
| <a href="../registry/service-center.html" class="md-nav__link"> |
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| |
| <span class="md-ellipsis"> |
| 使用Service Center |
| </span> |
| |
| |
| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../registry/nacos.html" class="md-nav__link"> |
| |
| |
| <span class="md-ellipsis"> |
| 使用Nacos |
| </span> |
| |
| |
| </a> |
| </li> |
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| <li class="md-nav__item"> |
| <a href="../registry/zookeeper.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 使用ZooKeeper |
| </span> |
| |
| |
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| <li class="md-nav__item"> |
| <a href="../registry/local-registry.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 本地注册发现 |
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| |
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| <li class="md-nav__item"> |
| <a href="../registry/distributed.html" class="md-nav__link"> |
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| |
| <span class="md-ellipsis"> |
| 去中心化注册发现 |
| </span> |
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| |
| </a> |
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| </ul> |
| </nav> |
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| <li class="md-nav__item md-nav__item--nested"> |
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| <input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_13" > |
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| <label class="md-nav__link" for="__nav_13" id="__nav_13_label" tabindex="0"> |
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| <span class="md-ellipsis"> |
| 多样化的配置管理功能 |
| </span> |
| |
| |
| <span class="md-nav__icon md-icon"></span> |
| </label> |
| |
| <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_13_label" aria-expanded="false"> |
| <label class="md-nav__title" for="__nav_13"> |
| <span class="md-nav__icon md-icon"></span> |
| 多样化的配置管理功能 |
| </label> |
| <ul class="md-nav__list" data-md-scrollfix> |
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| <a href="../config/general-config.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 服务配置介绍 |
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| <li class="md-nav__item"> |
| <a href="../config/read-config.html" class="md-nav__link"> |
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| <span class="md-ellipsis"> |
| 在程序中读取配置信息 |
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| |
| <h1 id="_1">文件下载开发指导</h1> |
| <p>Java Chassis提供了通用的 <code>文件下载</code> 支持。 如果返回值类型为 <code>File</code>、<code>Resource</code>、<code>InputStream</code>、<code>Part</code> 等,则被认为是 <code>文件下载</code>。 文件MIME类型和文件名可以使用 <code>Part</code> 的 API 指定。</p> |
| <ul> |
| <li>Spring MVC</li> |
| </ul> |
| <pre><code class="language-java">@GetMapping(path = "/downloadSpringMVCExample") |
| public Part downloadSpringMVCExample(String content) throws IOException { |
| File file = createTempFile(content); |
| return new FilePart(null, file) |
| .setDeleteAfterFinished(true) |
| .setSubmittedFileName("test.bin") |
| .contentType("application/octet-stream"); |
| } |
| </code></pre> |
| <p>上述接口会返回如下响应头:</p> |
| <pre><code class="language-text">Content-Disposition: attachment;filename=test.bin;filename*=utf-8’’test.bin |
| Content-Encoding: gzip |
| Content-Type: application/octet-stream |
| Transfer-Encoding: chunked |
| </code></pre> |
| <ul> |
| <li>JAX-RS</li> |
| </ul> |
| <pre><code class="language-java">@GET |
| @Path("/downloadSpringMVCExample") |
| public Part downloadSpringMVCExample(String content) throws IOException { |
| File file = createTempFile(content); |
| return new FilePart(null, file) |
| .setDeleteAfterFinished(true) |
| .setSubmittedFileName("test.bin") |
| .contentType("application/octet-stream"); |
| } |
| </code></pre> |
| <p>上述接口会返回如下响应头:</p> |
| <pre><code class="language-text">Content-Disposition: attachment;filename=test.bin;filename*=utf-8’’test.bin |
| Content-Encoding: gzip |
| Content-Type: application/octet-stream |
| Transfer-Encoding: chunked |
| </code></pre> |
| <h2 id="_2">服务提供者开发</h2> |
| <p>文件下载服务端定义建议使用 <code>Part</code>, 它提供了最丰富的功能,包括指定文件名、文件删除策略以及指定Content-Type等。 Java Chassis也提供了下面的一些类型支持。 </p> |
| <ul> |
| <li>File</li> |
| </ul> |
| <p>最简单的例子,接口的返回参数声明为 File 类型的参数, 即可定义一个下载接口。 </p> |
| <pre><code>@GetMapping(path = "/file") |
| public File file(String name) |
| </code></pre> |
| <ul> |
| <li>Resource</li> |
| </ul> |
| <p>可以将接口声明为 org.springframework.core.io.Resource。 由于resource不一定表示文件下载,所以需要通过 |
| @ApiResponse 标识这是一个文件下载场景</p> |
| <p>以ByteArrayResource为例说明:</p> |
| <pre><code>@GetMapping(path = "/resource") |
| @ApiResponses({ |
| @ApiResponse(code = 200, response = File.class, message = "") |
| }) |
| public Resource resource() { |
| return new ByteArrayResource(bytes) { |
| @Override |
| public String getFilename() { |
| return "resource.txt"; |
| } |
| }; |
| } |
| </code></pre> |
| <p>上例中,因为ByteArrayResource没有文件名的概念,所以需要实现Resource的getFilename方法,也可以通过ResponseEntity进行包装:</p> |
| <pre><code>@GetMapping(path = "/resource") |
| @ApiResponses({ |
| @ApiResponse(code = 200, response = File.class, message = "") |
| }) |
| public ResponseEntity<Resource> resource() { |
| return ResponseEntity |
| .ok() |
| .header(HttpHeaders.CONTENT_TYPE, MediaType.TEXT_PLAIN_VALUE) |
| .header(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=resource.txt") |
| .body(resource); |
| } |
| </code></pre> |
| <ul> |
| <li>InputStream</li> |
| </ul> |
| <p>一样的, 使用 InputStream 需要 @ApiResponse 标识这是一个文件下载场景</p> |
| <pre><code>@GetMapping(path = "/inputStream") |
| @ApiResponses({ |
| @ApiResponse(code = 200, response = File.class, message = ""), |
| }) |
| public ResponseEntity<InputStream> download() throws IOException { |
| return ResponseEntity |
| .ok() |
| .header(HttpHeaders.CONTENT_TYPE, MediaType.TEXT_PLAIN_VALUE) |
| .header(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=resource.txt") |
| .body(stream); |
| } |
| </code></pre> |
| <p>在下载完成后,ServiceComb会自动关闭stream,开发人员不必再关注。</p> |
| <ul> |
| <li>文件类型判定</li> |
| </ul> |
| <p>只要没有通过ResponseEntity直接设置HttpHeaders.CONTENT_TYPE,Java Chassis都会尝试通过File、Part、Resource中的文件名后缀进行自动判定。</p> |
| <p>Java Chassis使用java的mime type机制进行文件类型判定,如果业务场景中的文件后缀无法被识别,Java Chassis会默认处理为application/octet-stream</p> |
| <p>如果这不满足要求,假设文件后缀为xyz,期望文件类型为application/file-xyz,以下方式任选一种均可解决:</p> |
| <ol> |
| <li>通过Java的mime type机制扩展</li> |
| </ol> |
| <p>在META-INF目录下,创建mime.types文件,其内容为:</p> |
| <pre><code>application/file-xyz xyz |
| </code></pre> |
| <pre><code>2. 在业务代码中通过Part指定 |
| </code></pre> |
| <pre><code>@GetMapping(path = "/tempFilePart") |
| public Part tempFilePart(String content) throws IOException { |
| File file = createTempFile(content); |
| |
| return new FilePart(null, file) |
| .setDeleteAfterFinished(true) |
| .contentType("application/file-xyz") |
| .setSubmittedFileName("tempFilePart.txt"); |
| } |
| |
| </code></pre> |
| <pre><code>3. 在业务代码中通过ResponseEntity指定 |
| </code></pre> |
| <pre><code>@GetMapping(path = "/tempFileEntity") |
| public ResponseEntity<Part> tempFileEntity(String content) throws IOException { |
| File file = createTempFile(content); |
| |
| return ResponseEntity |
| .ok() |
| .header(HttpHeaders.CONTENT_TYPE, "application/file-xyz") |
| .header(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=tempFileEntity.txt") |
| .body(new FilePart(null, file) |
| .setDeleteAfterFinished(true)); |
| } |
| </code></pre> |
| <ul> |
| <li>指定文件名</li> |
| </ul> |
| <p>只要没有通过ResponseEntity直接设置HttpHeaders.CONTENT_DISPOSITION,Java Chassis都会尝试通过File、Part、Resource中的文件名生成HttpHeaders.CONTENT_DISPOSITION,假设文件名为file.txt,则生成的数据如下:</p> |
| <pre><code>Content-Disposition: attachment;filename=file.txt;filename*=utf-8’’file.txt |
| </code></pre> |
| <p>不仅仅生成 <code>filename</code> ,还生成了 <code>filename\*</code> ,这是因为如果文件名中出现了中文、空格,并且filename正确地做了encode,ie、chrome都没有问题,但是firefox直接将encode后的串当作文件名直接使用了。firefox按照<a href="https://tools.ietf.org/html/rtf6266">https://tools.ietf.org/html/rtf6266</a> ,只对 <code>filename\*</code> 进行解码。</p> |
| <p>如果业务代码中直接设置Content-Disposition,需要自行处理多浏览器支持的问题。</p> |
| <h2 id="_3">服务消费者开发</h2> |
| <p>消费者统一使用 org.apache.servicecomb.foundation.vertx.http.ReadStreamPart 处理文件下载。 |
| 可以使用透明 RPC 方式, </p> |
| <pre><code>public interface ……{ |
| ReadStreamPart download1(……); |
| ReadStreamPart download2(……); |
| } |
| </code></pre> |
| <p>或者 RestTemplate</p> |
| <pre><code>ReadStreamPart part = restTemplate.getForObject(url, ReadStreamPart.class); |
| </code></pre> |
| <p>ReadStreamPart提供了一系列方法,将数据流保存为本地数据:</p> |
| <pre><code>org.apache.servicecomb.foundation.vertx.http.ReadStreamPart.saveAsBytes() |
| org.apache.servicecomb.foundation.vertx.http.ReadStreamPart.saveAsString() |
| org.apache.servicecomb.foundation.vertx.http.ReadStreamPart.saveToFile(String) |
| org.apache.servicecomb.foundation.vertx.http.ReadStreamPart.saveToFile(File, OpenOptions) |
| </code></pre> |
| <p><strong><em>注意:</em></strong></p> |
| <ul> |
| <li>在得到ReadStreamPart实例时,并没有完成文件内容的下载,调用save系列方法才开始真正从网络上读取文件数据。</li> |
| <li>如果使用saveAsBytes、saveAsString,数据是直接保存在内存中的,如果下载的文件很大,会导致内存溢出。</li> |
| <li>save系列方法,返回的都是CompletableFuture对象, 如果要阻塞等待下载完成,通过future.get()即可; |
| 如果通过future.whenComplete进行异步回调处理,要注意回调是发生在网络线程中的,此时需要遵守reactive的线程规则。</li> |
| </ul> |
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