Content-Disposition

文件下載響應頭的設置

content-type?指示響應內容的格式

content-disposition?指示如何處理響應內容。

一般有兩種方式:

• inline:直接在頁面顯示
• attchment:以附件形式下載

/**
 * 設置強制下載
 * @param fileName
 * @param response
 */
@RequestMapping("/downOpen")
public void downOpen(@RequestParam("fileName") String fileName,HttpServletResponse response){
    String fix = fileName.substring(fileName.lastIndexOf("."), fileName.length());
    response.setHeader("Content-Disposition", "attachment;filename=" + System.currentTimeMillis()+fix);
    response.setContentType("application/force-download");
    response.setCharacterEncoding("UTF-8");
    FtpUtil.downloadOpen(fileName,response);
}

/**
 * 設置Content-Disposition :inline 無效直接下載,不打開
 * @param fileName
 * @param response
 */
@RequestMapping("/forceDownInline")
public void forceDownInline(@RequestParam("fileName") String fileName,HttpServletResponse response){
    String fix = fileName.substring(fileName.lastIndexOf("."), fileName.length());
    response.setHeader("Content-Disposition", "inline;filename=" + System.currentTimeMillis()+fix);
    response.setContentType("application/force-download");
    response.setCharacterEncoding("UTF-8");
    FtpUtil.downloadOpen(fileName,response);
}

/**
 * 不設置 Content-Disposition 在頁面顯示
 * @param url
 * @param response
 */
@RequestMapping("/urlOpen/{url}")
public void urlOpen(@PathVariable("url") String url, HttpServletResponse response){
    response.setContentType("image/png");
    response.setCharacterEncoding("UTF-8");
    FtpUtil.urlOpen(url,response);
}
/**
 * inline:直接在頁面顯示
 * @param url
 * @param response
 */
@RequestMapping("/urlOpenInline/{url}")
public void urlOpenInline(@PathVariable("url") String url, HttpServletResponse response){
    response.setHeader("Content-Disposition", "inline;filename=" + System.currentTimeMillis()+".png");
    response.setContentType("image/png");
    response.setCharacterEncoding("UTF-8");
    FtpUtil.urlOpen(url,response);
}

/**
 * 附件形式下載,不打開
 * @param url
 * @param response
 */
@RequestMapping("/urlDownAttachment/{url}")
public void urlDownAttachment(@PathVariable("url") String url, HttpServletResponse response){
    response.setHeader("Content-Disposition", "attachment;filename=" + System.currentTimeMillis()+".png");
    response.setContentType("image/png");
    response.setCharacterEncoding("UTF-8");
    FtpUtil.urlOpen(url,response);
}

/**
 * attachment:以附件形式下載,不打開
 * @param url
 * @param response
 */
@RequestMapping("/downAttachment/{url}")
public void downAttachment(@PathVariable("url") String url, HttpServletResponse response){
    response.setHeader("Content-Disposition", "attachment;filename=" + System.currentTimeMillis()+".png");
    response.setContentType("application/octet-stream");
    response.setCharacterEncoding("UTF-8");
    FtpUtil.urlOpen(url,response);
}

/**
 * 設置Content-Disposition :inline 無效 直接下載 不打開
 * @param url
 * @param response
 */
@RequestMapping("/streamInline/{url}")
public void streamInline(@PathVariable("url") String url, HttpServletResponse response){
    response.setHeader("Content-Disposition", "inline;filename=" + System.currentTimeMillis()+".png");
    response.setContentType("application/octet-stream");
    response.setCharacterEncoding("UTF-8");
    FtpUtil.urlOpen(url,response);
}

?

以上這幾種設置方式,在<img>?標簽中都會展示出圖片,不同的是在瀏覽器訪問,

<p style="width: 100px;height: 100px;">
    <!--顯示有效,預覽為二進制流數據-->
    <img alt="downOpen" src="http://localhost:8080/ftp/downOpen?fileName=1677072114406.jpeg"/>
</p>
<p style="width: 100px;height: 100px;">
    <!--顯示有效,預覽為圖片本圖-->
    <img alt="urlOpen" src="http://localhost:8080/ftp/urlOpen/1677072114406.jpeg"/>
</p>
<p style="width: 100px;height: 100px;">
    <!--顯示有效,預覽為圖片本圖-->
    <img alt="urlOpenInline" src="http://localhost:8080/ftp/urlOpenInline/1677072114406.jpeg"/>
</p>
<p style="width: 100px;height: 100px;">
    <!--顯示有效,預覽為圖片本圖-->
    <img alt="downAttachment" src="http://localhost:8080/ftp/downAttachment/1677072114406.jpeg"/>
</p>
<p style="width: 100px;height: 100px;">
    <!--顯示有效,預覽為圖片本圖-->
    <img alt="urlDownAttachment" src="http://localhost:8080/ftp/urlDownAttachment/1677072114406.jpeg"/>
</p>
<p style="width: 100px;height: 100px;">
    <!--顯示有效,預覽為圖片本圖-->
    <img alt="streamInline" src="http://localhost:8080/ftp/streamInline/1677072114406.jpeg"/>
</p>
<p style="width: 100px;height: 100px;">
    <!--顯示有效,預覽為二進制流數據-->
    <img alt="streamInline" src="http://localhost:8080/ftp/forceDownInline?fileName=1677072114406.jpeg"/>
</p>

在<img>標簽中,預覽會有不同

設置

response.setContentType("application/octet-stream");?預覽為二進制流數據

其他設置預覽為圖片

在瀏覽器訪問url時設置

Content-Disposition :attachment 會下載,不打開

Content-Disposition :inline 不下載,直接打開