最近在做一个临时的项目，APP端在检测到程序有更新时，需要去后台下载新的安装包。具体过程如下:
controller层：
@RequestMapping("downApp")
@ResponseBody
public void Download(HttpServletResponse response) {
String fileName ="wuye.apk";
String result = FileUtil.downloadFile(response, fileName);
log.info("app包下载结果:",result);
}工具类：
public class FileUtil {
public static String downloadFile(HttpServletResponse response, String fileName) {
File path =null;
response.setHeader("content-type","application/octet-stream");
response.setContentType("application/octet-stream");
try {
response.setHeader("Content-Disposition","attachment;filename=" + java.net.URLEncoder.encode(fileName,"UTF-8"));
}catch (UnsupportedEncodingException e2) {
e2.printStackTrace();
}
byte[] buff =new byte[1024];
BufferedInputStream bis =null;
OutputStream os =null;
try {
path =new File(ResourceUtils.getURL("classpath:").getPath());
os = response.getOutputStream();
bis =new BufferedInputStream(new FileInputStream(new File(path +"/doc/" + fileName)));
int i = bis.read(buff);
while (i != -1) {
os.write(buff,0, buff.length);
os.flush();
i = bis.read(buff);
}
}catch (FileNotFoundException e1) {
//e1.getMessage()+"系统找不到指定的文件";
return "系统找不到指定的文件";
}catch (IOException e) {
e.printStackTrace();
}finally {
if (bis !=null) {
try {
bis.close();
}catch (IOException e) {
e.printStackTrace();
}
}
}
return "success";
}访问：http://127.0.0.1:8081/ymd/downApp 文件就下载下来了，本方法借鉴了 网络上的一些文章
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