后端和前端之间的文件(完整示例)

Question

我正在将文件网址传递给前端。问题是 url 只对服务器可用(settings.dockerIP())，因为用户没有连接到码头工人。

所以我需要一种方法将我的 url 转换为文件，然后将其全部发送到后端的用户。

我当前的代码是这样的(它可以工作，但用户需要一个隧道到 docker 主机)

控制器

@RequestMapping("/report")
public ModelAndView report(HttpServletRequest request) {
String environmentName = request.getParameter("name");
ModelAndView model = new ModelAndView("report");    
model.addObject("file", Report.getFileFromContainer(environmentName));
return model;
}

类

public static String getFileFromContainer(String environmentName) {
Container container = getContainerID(environmentName);
String url = "";
if(container != null) {
Settings settings = Settings.getSettings();
url = "http://" + settings.getDockerIP() + ":" + settings.getDockerPort() + "/containers/" + container.getId() + "/archive?path=/path/file";
}
return url;
}

前端

<a href="${file}"></a>

Answer 1

您可以在返回文件作为流的情况下创建一个方法，您将最后一个的 url 分配给您的链接按钮，

@RequestMapping(value="getFile", method=RequestMethod.GET)
public void getFile(HttpServletResponse response,HttpServletRequest request) {
String environmentName = request.getParameter("name");
//here the code to get your file as stream 
//whether getting the file by Ressource or buffred ,
//here for example I named a getfileStream() method wihch return your file  InputStream
InputStream myStream  = getFileStream(environmentName);

// Set the content type and attachment header add filename and it's extention.
response.addHeader("Content-disposition", "attachment;filename=myfile.myExtention");
response.setContentType("txt/plain");
// copy your file stream to Response 
IOUtils.copy(myStream, response.getOutputStream());
response.flushBuffer();
}

为了获得名称parameter您只需将其传递给/report控制器中的modelview，然后将其分配给您的链接。

如下：

@RequestMapping("/report")
public ModelAndView report(HttpServletRequest request) {
String environmentName = request.getParameter("name");
ModelAndView model = new ModelAndView("report");    
model.addObject("name", environmentName);
return model;
}

那么你的链接将是：

<a href="<c:url value="/getFile" />?name=${name}">Get file</a>

getFileStream 可能是这样的：

public InputStream getFileStream(String environmentName) {
Container container = getContainerID(environmentName);
String url = "";
if(container != null) {
Settings settings = Settings.getSettings();
url = "http://" + settings.getDockerIP() + ":" + settings.getDockerPort() + "/containers/" + container.getId() + "/archive?path=/path/file";
}
InputStream is = new URL(url).openStream();
return is; 
}

您必须将以下 appace 通用 io 添加到您的项目中才能使用 IOUtils

<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.5</version>
</dependency>