本文實例為大家分享了java文件上傳下載的具體代碼，供大家參考，具體內容如下
文件上傳
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@requestmapping(value="/uploadfile",method=requestmethod.post) public resultobject uploadfiles(@requestparam("file")multipartfile file,httpservletrequest request){ resultobject rs = null;//返回上傳完成信息 string uploaddir = "files";//上傳目錄,文件保存在webapp下的files文件中 if(!file.isempty()) { //可以對user做一些操作如存入數據庫 //以下的代碼是將文件file重新命名并存入tomcat的webapp目錄下項目的下級目錄 string filerealname = file.getoriginalfilename(); //獲得原始文件名; /*int pointindex = filerealname.indexof("."); //點號的位置 string filesuffix = filerealname.substring(pointindex); //截取文件后綴 uuid fileid = uuid.randomuuid(); //生成文件的前綴包含連字符 string savedfilename = fileid.tostring().replace("-", "").concat(filesuffix); //文件存取名 */ string saveddir = request.getsession().getservletcontext().getrealpath(uploaddir); //獲取服務器指定文件存取路徑 file savedfile = new file(saveddir, filerealname); boolean iscreatesuccess; try { iscreatesuccess = savedfile.createnewfile(); if (iscreatesuccess) { file.transferto(savedfile); //轉存文件 rs = resultobject.getsuccessresult("上傳文件成功"); long size = file.getsize();//獲取文件大小 rs.setdata(uploaddir+filerealname); }else{ rs = resultobject.getfailresult("請修改文件名,重新上傳"); } } catch (ioexception e) { e.printstacktrace(); } }else{ rs = resultobject.getfailresult("文件不能為空"); } return rs; } |
文件下載
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@requestmapping(value = "/filterpermission/appdownload", method = requestmethod.get) public void appdownload(httpservletrequest request, httpservletresponse response) { //url是上面文件上傳的url download(url,request,response); } |
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public string download(string filepath, httpservletrequest request, httpservletresponse response) { bufferedinputstream bis = null; bufferedoutputstream bos = null; try { //獲取文件名 string filename = filepath.substring(filepath.lastindexof("/")+1); response.setcharacterencoding("utf-8"); response.setcontenttype("application/octet-stream"); //response.setcontenttype("application/force-download"); //處理下載彈出框名字的編碼問題 response.setheader("content-disposition", "attachment;filename=" + new string( filename.getbytes("gb2312"), "iso8859-1" )); //獲取文件的下載路徑 string path = request.getsession().getservletcontext().getrealpath(filepath); //利用輸入輸出流對文件進行下載 inputstream inputstream = new fileinputstream(new file(path)); //設置文件大小 response.setheader("content-length", string.valueof(inputstream.available())); bis = new bufferedinputstream(inputstream);//構造讀取流 bos = new bufferedoutputstream(response.getoutputstream());//構造輸出流 byte[] buff = new byte[1024]; int bytesread; //每次讀取緩存大小的流，寫到輸出流 while (-1 != (bytesread = bis.read(buff, 0, buff.length))) { bos.write(buff, 0, bytesread); } response.flushbuffer();//將所有的讀取的流返回給客戶端 } 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("下載文件失敗,"+"文件路徑:"+filepath+e); logger.error("文件下載失敗!", e); } } // 返回值要注意，要不然就出現下面這句錯誤！ //java+getoutputstream() has already been called for this response return null; } |
以上所述是小編給大家介紹的java文件上傳下載詳解整合，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對服務器之家網站的支持！
原文鏈接：https://www.cnblogs.com/gczmn/p/9921479.html
