本文实例为大家分享了java文件上传下载的具体代码，供大家参考，具体内容如下
文件上传
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
@requestmapping(value="/uploadfile",method=requestmethod.post) public resultobject uploadfiles(@requestparam("file")multipartfile file,httpservletrequest request){ resultobject rs = null;//返回上传完成信息 string uploaddir = "files";//上传目录,文件保存在webapp下的files文件中 if(!file.isempty()) { //可以对user做一些操作如存入数据库 //以下的代码是将文件file重新命名并存入tomcat的webapp目录下项目的下级目录 string filerealname = file.getoriginalfilename(); //获得原始文件名; /*int pointindex = filerealname.indexof("."); //点号的位置 string filesuffix = filerealname.substring(pointindex); //截取文件后缀 uuid fileid = uuid.randomuuid(); //生成文件的前缀包含连字符 string savedfilename = fileid.tostring().replace("-", "").concat(filesuffix); //文件存取名 */ string saveddir = request.getsession().getservletcontext().getrealpath(uploaddir); //获取服务器指定文件存取路径 file savedfile = new file(saveddir, filerealname); boolean iscreatesuccess; try { iscreatesuccess = savedfile.createnewfile(); if (iscreatesuccess) { file.transferto(savedfile); //转存文件 rs = resultobject.getsuccessresult("上传文件成功"); long size = file.getsize();//获取文件大小 rs.setdata(uploaddir+filerealname); }else{ rs = resultobject.getfailresult("请修改文件名,重新上传"); } } catch (ioexception e) { e.printstacktrace(); } }else{ rs = resultobject.getfailresult("文件不能为空"); } return rs; } |
文件下载
|
1
2
3
4
5
|
@requestmapping(value = "/filterpermission/appdownload", method = requestmethod.get) public void appdownload(httpservletrequest request, httpservletresponse response) { //url是上面文件上传的url download(url,request,response); } |
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
public string download(string filepath, httpservletrequest request, httpservletresponse response) { bufferedinputstream bis = null; bufferedoutputstream bos = null; try { //获取文件名 string filename = filepath.substring(filepath.lastindexof("/")+1); response.setcharacterencoding("utf-8"); response.setcontenttype("application/octet-stream"); //response.setcontenttype("application/force-download"); //处理下载弹出框名字的编码问题 response.setheader("content-disposition", "attachment;filename=" + new string( filename.getbytes("gb2312"), "iso8859-1" )); //获取文件的下载路径 string path = request.getsession().getservletcontext().getrealpath(filepath); //利用输入输出流对文件进行下载 inputstream inputstream = new fileinputstream(new file(path)); //设置文件大小 response.setheader("content-length", string.valueof(inputstream.available())); bis = new bufferedinputstream(inputstream);//构造读取流 bos = new bufferedoutputstream(response.getoutputstream());//构造输出流 byte[] buff = new byte[1024]; int bytesread; //每次读取缓存大小的流，写到输出流 while (-1 != (bytesread = bis.read(buff, 0, buff.length))) { bos.write(buff, 0, bytesread); } response.flushbuffer();//将所有的读取的流返回给客户端 } catch (filenotfoundexception e) { e.printstacktrace(); } catch (ioexception e) { e.printstacktrace(); }finally{ try{ if(null != bis){ bis.close(); } if(null != bos){ bos.close(); } }catch(ioexception e){ system.out.println("下载文件失败,"+"文件路径:"+filepath+e); logger.error("文件下载失败!", e); } } // 返回值要注意，要不然就出现下面这句错误！ //java+getoutputstream() has already been called for this response return null; } |
以上所述是小编给大家介绍的java文件上传下载详解整合，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：https://www.cnblogs.com/gczmn/p/9921479.html
