一、传统流方式
@RequestMapping(value = "antennaAttitudeDownloadFile.do", method = RequestMethod.POST, produces = "application/json;charset=UTF-8")
@ResponseBody
public String antennaAttitudeDownloadFile(String path, HttpServletResponse response){
//判断下载路径是否为空
if (!StringUtils.isEmpty(path)) {
//通过绝对路径获取文件
File file = new File(path);
//判断文件是否为空
if (file.exists()) {
//生成文件名
String fileName = "测听室.txt";
// 配置文件下载
response.setHeader("content-type", "application/octet-stream");
response.setContentType("application/octet-stream");
// 下载文件能正常显示中文
try {
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
// 实现文件下载
byte[] buffer = new byte[1024];
FileInputStream fis = null;
BufferedInputStream bis = null;
try {
fis = new FileInputStream(file);
bis = new BufferedInputStream(fis);
OutputStream os = response.getOutputStream();
int i = bis.read(buffer);
while (i != -1) {
os.write(buffer, 0, i);
i = bis.read(buffer);
os.flush();
}
} catch (IOException e) {
e.printStackTrace();
}finally {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (bis!= null){
try {
bis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
return null;
}
二、通过 ResponseEntity<byte[]> 进行下载
@RequestMapping(value = "antennaAttitudeDownloadFile.do", method = RequestMethod.POST, produces = "application/json;charset=UTF-8")
@ResponseBody
public ResponseEntity<byte[]> antennaAttitudeDownloadFile(String path, HttpServletResponse response) {
//判断下载路径是否为空
if (!StringUtils.isEmpty(path)) {
//通过绝对路径获取文件
File file = new File(path);
//判断文件是否为空
if (file.exists()) {
//生成文件名
String fileName = "略略略.txt";
HttpHeaders headers = null;
try {
//请求头
headers = new HttpHeaders();
//解决文件名乱码
String downloadFileName = new String(fileName.getBytes("UTF-8"), "iso-8859-1");
//让浏览器知道用attachment（下载方式）打开图片
headers.setContentDispositionFormData("attachment", downloadFileName);
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
} catch (Exception e) {
throw new RuntimeException(e);
}
try {
return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file), headers, HttpStatus.OK);
} catch (IOException e) {
e.printStackTrace();
}
}
}
return null;
}
写在最后特别注意的是,文件下载发送请求不能以ajax发送异步请求,以ajax发送的请求返回文件会以二进制流回显到response里,如需要以ajax发送需另行配置
写一种发送请求的方法
<script>
$("#btn").click(function(){
var url = "http://localhost:8081/tiankui-tools-web/antennaAttitude/antennaAttitudeDownloadFile.do";
var form = $("<form></form>").attr("action", url).attr("method", "post");
form.append($("<input></input>").attr("type", "hidden").attr("name", "path").attr("value",$("#path").val()));
form.appendTo('body').submit().remove();
});
</script>
