从servlet中的文件系统提供静态图像文件？ [英] Serve a static image file from the filesystem in a servlet?

问题描述

如何在servlet中为文件系统提供图像文件？ > 示例仓库：在Servlet中返回图像 链接破碎。插入下面的Wayback Machine拷贝：

  //这个方法被servlet容器调用来处理一个GET请求。 
 public void doGet（HttpServletRequest req，HttpServletResponse resp）throws IOException {
 //获取映像的绝对路径
 ServletContext sc = getServletContext（）; 
 String filename = sc.getRealPath（image.gif）; 
 
 //获取图像的MIME类型
 String mimeType = sc.getMimeType（filename）; 
 if（mimeType == null）{
 sc.log（无法得到MIME类型的+ filename）; 
 resp.setStatus（HttpServletResponse.SC_INTERNAL_SERVER_ERROR）; 
 return; 
} 
 
 //设置内容类型
 resp.setContentType（mimeType）; 
 
 //设置内容大小
文件文件=新文件（文件名）; 
 resp.setContentLength（（int）file.length（））; 
 
 //打开文件并输出流
 FileInputStream in = new FileInputStream（file）; 
 OutputStream out = resp.getOutputStream（）; 
 
 //将文件的内容复制到输出流
 byte [] buf = new byte [1024]; 
 int count = 0; （（count = in.read（buf））> = 0）{
 out.write（buf，0，count）; 
} 
 in.close（）; 
 out.close（）; 
} 
  

How do I serve an image file in the filesystem from a servlet?

解决方案

Have a look over here: Example Depot: Returning an Image in a Servlet Link broken. Wayback Machine copy inserted below:

// This method is called by the servlet container to process a GET request.
public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {
    // Get the absolute path of the image
    ServletContext sc = getServletContext();
    String filename = sc.getRealPath("image.gif");

    // Get the MIME type of the image
    String mimeType = sc.getMimeType(filename);
    if (mimeType == null) {
        sc.log("Could not get MIME type of "+filename);
        resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
        return;
    }

    // Set content type
    resp.setContentType(mimeType);

    // Set content size
    File file = new File(filename);
    resp.setContentLength((int)file.length());

    // Open the file and output streams
    FileInputStream in = new FileInputStream(file);
    OutputStream out = resp.getOutputStream();

    // Copy the contents of the file to the output stream
    byte[] buf = new byte[1024];
    int count = 0;
    while ((count = in.read(buf)) >= 0) {
        out.write(buf, 0, count);
    }
    in.close();
    out.close();
}

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