如何在客户端从控制器下载zip文件？春天的靴子

Question

我有file.zipDB喜欢的BLOB.我想在Spring控制器中创建方法,以便在客户端下载此文件.

@RequestMapping(value = "/downloadResolution/{resolutionId}", method = RequestMethod.GET)
    public void downloadResolution(@PathVariable("resolutionId") Long resolutionId, HttpServletResponse response) {
        Resolution resolution = resolutionService.findOne(resolutionId);
        ResolutionArchive resolutionArchive = resolution.getResolutionArchive();
        if (resolutionArchive == null) return;
        byte[] archive = resolutionArchive.getArchive();
        //this byte[] archive - my zip file from db
    }

如何更改此methot以便在客户端下载？

用户按下载按钮.Methos从byte []中获取数据,用户可以下载它.

编辑

我尝试了@pleft的解决方案,它的工作原理.我知道 - 我使用ajax进行呼叫方法

function downloadResolution(resulutionId) {
        $.ajax({
            type: 'GET',
            dataType: "json",
            url: '/downloadResolution/' + resulutionId,
            success: function (data) {
            },
            error: function (xhr, str) {
            }
        });
    }

如果我使用ajax,怎么意识到这一点？

Answer 1

你可以使用OutputStream你HttpServletResponse的编写存档字节.

例如

response.setHeader("Content-Disposition", "attachment; filename=file.zip");
response.setHeader("Content-Type", "application/zip");
response.getOutputStream().write(archive);

编辑

样本下载

@RequestMapping(value = "/downloadResolution/{resolutionId}", method = RequestMethod.GET, produces = MediaType.APPLICATION_OCTET_STREAM_VALUE)
public void downloadResolution(@PathVariable("resolutionId") Long resolutionId, HttpServletResponse response) throws IOException {
    String test = "new string test bytes";
    response.setHeader("Content-Disposition", "attachment; filename=file.txt");
    response.getOutputStream().write(test.getBytes());
}