這篇文章主要介紹了java實現文件上傳、下載、圖片預覽,文中通過示例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值,需要的朋友可以參考下
多文件保存到本地：
@ResponseBody
@RequestMapping(value = "/uploadApp",produces = { "application/json;charset=UTF-8" },method= RequestMethod.POST)
public String uploadApp( HttpServletRequest request,@RequestParam("file") MultipartFile[] file) throws IOException {
try {
if(file.length > 0) {
String name = file[0].getOriginalFilename().split(";")[0];
String fileUrlName = CommonEnum.FILEPATH+"/"+name;
for (int i = 0; i < file.length; i++) {
FileUtils.copyInputStreamToFile(file[i].getInputStream(), new File(fileUrlName, file[i].getOriginalFilename().split(";")[1]));
}
return "success";
}else{
return "null";
}
}catch (Exception e){
e.printStackTrace();
return "error";
}
}
下載文件：
@RequestMapping(value = "/download", method = RequestMethod.GET)
@ResponseBody
public void download(@RequestParam Map<String, Object> data, HttpServletRequest request,HttpServletResponse response) throws FileNotFoundException {
String time = DateUtil.formatFromDate("yyyyMMddHHmmss", new Date());
List<Map<String, Object>> urllist = companyService.findByIMG(data);
String path = (String) urllist.get(0).get("imgurl");
String docx = StringUtils.substringAfterLast(path, ".");
String fileName = time+"."+docx; // 文件的默認保存名
InputStream inStream = new FileInputStream(path);// 文件的存放路徑
response.reset();
response.setContentType("bin");
response.addHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
byte[] b = new byte[100];
int len;
try {
while ((len = inStream.read(b)) > 0)
response.getOutputStream().write(b, 0, len);
inStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 讀取圖片
*/
@RequestMapping(value = "/iomoreimgcom", produces = {
"application/json;charset=UTF-8" }, method = RequestMethod.GET)
@ResponseBody
public synchronized void iomoreimgcom(HttpServletRequest request, HttpServletResponse response) throws Exception {
String url = request.getParameter("url");
File file = new File(url);
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
BufferedOutputStream bos = new BufferedOutputStream(response.getOutputStream());
response.setHeader("Content-Type", "image/jpeg");
byte b[] = new byte[1024];
int read;
try {
while ((read = bis.read(b)) != -1) {
bos.write(b, 0, read);
}
//request.getRequestDispatcher("/components/hazard/yscchird.html").forward(request, response);
} catch (Exception e) {
// TODO: handle exception
} finally {
if (bos != null) {
bos.close();
}
if (bis != null) {
bis.close();
}
}
}
前端請求直接拼接圖片路徑即可。
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
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