springboot 下载zip压缩包文件

如果你想在Spring Boot中下载一个ZIP压缩文件，你可以使用Java的内置类库或者第三方库来实现。这里有两种实现方式：

1. 使用Java的内置类库

@GetMapping("/download")
public void downloadFile(HttpServletResponse response) throws IOException {
    String fileName = "example.zip";
    String filePath = "/path/to/example.zip";
    File file = new File(filePath);
    InputStream inputStream = new FileInputStream(file);
    response.setContentType("application/zip");
    response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
    IOUtils.copy(inputStream, response.getOutputStream());
    response.flushBuffer();
}

2. 使用第三方库

@GetMapping("/download")
public void downloadFile(HttpServletResponse response) throws IOException {
    String fileName = "example.zip";
    String filePath = "/path/to/example.zip";
    File file = new File(filePath);
    FileInputStream fis = new FileInputStream(file);
    response.setContentType("application/zip");
    response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
    response.setHeader("Content-Length", String.valueOf(file.length()));
    response.setHeader("Content-Transfer-Encoding", "binary");
    try {
        IOUtils.copy(fis, response.getOutputStream());
        response.flushBuffer();
    } finally {
        fis.close();
    }
}

其中，第二种方式使用了Apache Commons IO库中的IOUtils工具类。这个工具类可以很方便地将输入流复制到输出流中。