发布申请失败答案

【问题标题】：Post requisition failed发布申请失败
【发布时间】：2020-06-01 12:55:32
【问题描述】：

我正在尝试发出 POST 请求，将文件转换并下载为 pdf，但出现此错误：文档.service.ts：

  download(documento: IDocumento) {
    return this.http.post(SERVER_API_URL + "api/download/", documento).subscribe((response) => {
      saveAs(response, documento.tituloDocumento + "." + "pdf");
    });
  }

文档资源

    @RequestMapping(value = "/download", method = RequestMethod.POST)
public void download(HttpServletResponse response, @RequestBody DocumentoDTO documentoDTO) throws IOException {
    File file = new File(documentoDTO.getPathorigdoc());
    response.setContentType("pdf");
    response.setHeader("Content-disposition", "attachment;" + documentoDTO.getTituloDocumento());
    response.getOutputStream().write(Files.readAllBytes(file.toPath()));
}

Access to XMLHttpRequest at 'https://autenticacao.campogrande.ms.gov.br/auth/realms/dev/protocol/openid-connect/auth?response_type=code&client_id=web_app&scope=openid%20offline_access%20profile%20email%20address%20phone%20roles%20web-origins%20jhipster&state=DooRYbdfmKCip2apn-NOTWQOqWBGkeh-AigMtoJVfcM%3D&redirect_uri=http://localhost:9000/login/oauth2/code/oidc' (redirected from 'http://localhost:9000/api/download/') from origin 'http://localhost:9000' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
autenticacao.campogrande.ms.gov.br/auth/realms/dev/protocol/openid-connect/auth?response_type=code&client_id=web_app&scope=openid%20offline_access%20profile%20email%20address%20phone%20roles%20web-origins%20jhipster&state=DooRYbdfmKCip2apn-NOTWQOqWBGkeh-AigMtoJVfcM%3D&redirect_uri=http://localhost:9000/login/oauth2/code/oidc:1 Failed to load resource: net::ERR_FAILED
webpack-internal:///./node_modules/@angular/core/fesm5/core.js:6249 ERROR HttpErrorResponse

【问题讨论】：

您需要在服务器上设置 CORS 以允许您的应用发出 XHR 请求
你能告诉我我在哪里做的吗？
在您的 API 上。我看到这个问题是因为它出现在我的 Angular 提要中。当您在这里没有任何答案时，您应该阅读 SpringBoot 中的 CORS。
这似乎是一个很好的起点spring.io/guides/gs/rest-service-cors

标签： angular spring spring-boot post request

【解决方案1】：

不知道你用的是什么服务器，但是需要修改服务中的headers值（java中的一个例子）

How to handle CORS using JAX-RS with Jersey

【讨论】：

【解决方案2】：

能够解决，但您没有管理下载，我认为是因为或答案返回 null，我需要修复什么吗？

    @PostMapping(value = "/download")
public void download(HttpServletResponse response, @RequestBody DocumentoDTO documentoDTO) throws IOException {
    String caminho = "";

    caminho += "/arquivos/leisweb" + File.separator + documentoDTO.getPathorigdoc();

    File file = new File(caminho);
    response.setContentType("application/pdf");
    response.setHeader("Content-disposition", "attachment;" + documentoDTO.getTituloDocumento() + ".pdf");
    response.getOutputStream().write(Files.readAllBytes(file.toPath()));
}

  download(documento: IDocumento) {
    return this.http.post(SERVER_API_URL + "api/download", documento).subscribe((response) => {
      saveAs(response, documento.tituloDocumento + "." + "pdf");
    });
  }

返回：退出：.web.rest.DocumentoResource.download() with result = null

【讨论】：