SSM 实现文件下载功能（用postman测试）
- 前端只用传文件的路径即可。 如：String path = “D:\user\test.docx”;
- controller
@Autowired
FileService fileService;
/**
* 前端传文件路径来下载文件
*
* @param path 文件路径，如 /guide/appendix.doc
* @param response
* @return
*/
@RequestMapping(value = "/download")
@ResponseBody
public CommonReturnType downloadAppendix(@Param("path") String path, HttpServletRequest request, HttpServletResponse response) {
fileService.downloadFile(path,request,response);
return CommonReturnType.create(null, "下载完成");
} - service
@Override
public void downloadFile(String path, HttpServletRequest request, HttpServletResponse response) {
try {
//String pathTest = "D:\\UPC\\offer"+"\\"+fileName;
//转码，免得文件名中文乱码(有时候加上反而会乱码)
// fileName = URLEncoder.encode(fileName,"UTF-8");
//从路径中获取文件名称，trim：去除字符串前后的空格
File tempFile = new File(path.trim());
String filename = tempFile.getName();
//解决中文文件名乱码
String userAgent = request.getHeader("User-Agent");
//IE内核浏览器
if (userAgent.contains("MSIE") || userAgent.contains("Trident")) {
filename = java.net.URLEncoder.encode(filename, "UTF-8");
} else {
// 非IE浏览器的处理：
filename = new String(filename.getBytes("UTF-8"), "ISO-8859-1");
}
//设置文件下载头
response.setHeader("Content-disposition",String.format("attachment; filename=\"%s\"", filename));
//设置文件ContentType类型，这样设置，会自动判断下载文件类型
response.setContentType("multipart/form-data");
response.setCharacterEncoding("UTF-8");
InputStream inputStream = new BufferedInputStream(new FileInputStream(new File(path)));
BufferedOutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
//创建缓冲区
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, length);
outputStream.flush();
}
//关闭流
inputStream.close();
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
} - postman测试
本人完整调试，简单标准实现文件下载
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