1.Java在jsp中 如何上传 在上传时可以取到大小并修改
2.javaå®ç°å¾çä¸ä¼ ä¸è½½ï¼
Java在jsp中 如何上传 在上传时可以取到大小并修改
用第三方工具去取 common-upload,图片lora源码解释具体取到的方法参考代码如下:
FileItemFactory fileItemFactory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(fileItemFactory);
upload.setHeaderEncoding("utf-8");
try {
List<FileItem> items = upload.parseRequest(request);
for (FileItem fileItem : items) {
System.out.println("fileName=" + fileItem.getFieldName());
//获取文件流
InputStream in = fileItem.getInputStream();
ServletContext context = getServletConfig().getServletContext();
String path = context.getRealPath("image");
System.out.println(path);
OutputStream out = new FileOutputStream(new File(path + "\\" + fileItem.getName()));
byte[] buffer = new byte[];
int len = 0;
while((len = in.read(buffer)) != -1) {
out.write(buffer, 0, len);
}
out.close();
in.close();
System.out.println("写入完毕");
}
} catch (FileUploadException e) {
e.printStackTrace();
}
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html
head
titleæ件ä¸ä¼ æ¼ç¤º/title
/head
bodybgcolor=â#FFFFFFâtext=â#âleftmargin=â0âtopmargin=ââmarginwidth=â0âmarginheight=â0â
center
h1æ件ä¸ä¼ æ¼ç¤º/h1
formname=âuploadformâmethod=âPOSTâaction=âsave.jspâENCTYPE=âmultipart/form-dataâ
tableborder=â1âwidth=ââcellpadding=â4âcellspacing=â2âbordercolor=â#9BD7FFâ
trtdwidth=â%âcolspan=â2â
æ件1ï¼inputname=âfile1âsize=ââtype=âfileâ
/td/tr
trtdwidth=â%âcolspan=â2â
æ件2ï¼inputname=âfile2âsize=ââtype=âfileâ
/td/tr
trtdwidth=â%âcolspan=â2â
æ件3ï¼inputname=âfile3âsize=ââtype=âfileâ
/td/tr
/table
br/br/
table
trtdalign=âcenterâinputname=âuploadâtype=âsubmitâvalue=âå¼å§ä¸ä¼ â//td/tr
/table
/form
/center
/body
/html
代ç ä¸è¦ç¹å«æ³¨æçæ¯é»ä½å¤ãå¿ é¡»ä¿è¯è¡¨åçENCTYPEå±æ§å¼ä¸ºmultipart/form-dataï¼è¿æ ·æµè§å¨æè½æ£ç¡®æ§è¡ä¸ä¼ æ件çæä½ã
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ç±äºæ¬æ主è¦æ¯è®²è¿°å¦ä½ä½¿ç¨Commons-fileuploadï¼æ以为äºä¾¿äºä¿®æ¹ãè°è¯ï¼ä¸ä¼ æ件çä¿å使ç¨ä¸ä¸ªJSPæ件æ¥è¿è¡å¤çãæ们å°æµè§å¨ä¸ä¼ æ¥çæææ件ä¿åå¨ä¸ä¸ªæå®ç®å½ä¸å¹¶å¨é¡µé¢ä¸æ¾ç¤ºææä¸ä¼ æ件ç详ç»ä¿¡æ¯ãä¿å页é¢å¤çç»æè§å¾2æ示ã
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ä¸é¢æ¥ççsave.jspç代ç :
%
/
***æ¼ç¤ºæ件ä¸ä¼ çå¤ç
*@authorahref=âmailto:winter.lau@.comâWinterLau/a
*@version$Id:save.jsp,v1.//::
*/
%
%@pagelanguage=âjavaâcontentType=âtext/html;charset=GBKâ%
%@pageimport=âjava.util.*â%
%@pageimport=âorg.apache.commons.fileupload.*â%
html
head
titleä¿åä¸ä¼ æ件/title
/head
%
Stringmsg=ââ;
FileUploadfu=newFileUpload();
//设置å 许ç¨æ·ä¸ä¼ æ件大å°,åä½:åè
fu.setSizeMax();
//maximumsizethatwillbestoredinmemory?
//设置æå¤åªå 许å¨å åä¸åå¨çæ°æ®,åä½:åè
fu.setSizeThreshold();
//设置ä¸æ¦æ件大å°è¶ è¿getSizeThreshold()çå¼æ¶æ°æ®åæ¾å¨ç¡¬ççç®å½
fu.setRepositoryPath(âC:\\TEMPâ);
//å¼å§è¯»åä¸ä¼ ä¿¡æ¯
ListfileItems=fu.parseRequest(request);
%
bodybgcolor=â#FFFFFFâtext=â#âleftmargin=â0âtopmargin=ââmarginwidth=â0âmarginheight=â0â
fontsize=â6âcolor=âblueâæ件å表ï¼/font
center
tablecellpadding=0cellspacing=1border=1width=â%â
tr
tdbgcolor=â#âæ件å/td
tdbgcolor=â#â大å°/td
/tr
%
//ä¾æ¬¡å¤çæ¯ä¸ªä¸ä¼ çæ件
Iteratoriter=fileItems.iterator();
while(iter.hasNext()){
FileItemitem=(FileItem)iter.next();
//忽ç¥å ¶ä»ä¸æ¯æ件åçææ表åä¿¡æ¯
if(!item.isFormField()){
Stringname=item.getName();
longsize=item.getSize();
if((name==null||name.equals(ââ))size==0)
continue;
%
tr
td%=item.getName()%/td
td%=item.getSize()%/td
/tr
%
//ä¿åä¸ä¼ çæ件å°æå®çç®å½
name=name.replace(â:â,â_â);
name=name.replace(â\\â,â_â);
item.write(âF:\\â+name);
}
}
%
/table
br/br/
ahref=âupload.htmlâè¿åä¸ä¼ 页é¢/a
/center
/body
/html
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FileUploadfu=newFileUpload();
//设置å 许ç¨æ·ä¸ä¼ æ件大å°,åä½:åè
fu.setSizeMax();
//maximumsizethatwillbestoredinmemory?
//设置æå¤åªå 许å¨å åä¸åå¨çæ°æ®,åä½:åè
fu.setSizeThreshold();
//设置ä¸æ¦æ件大å°è¶ è¿getSizeThreshold()çå¼æ¶æ°æ®åæ¾å¨ç¡¬ççç®å½
fu.setRepositoryPath(âC:\\TEMPâ);
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SizeThreshold设置å åä¸ç¼å²åºç大å°ï¼ä¸æ¦æ件ç大å°è¶ è¿è¯¥å¼çæ¶åï¼ç¨åºä¼èªå¨å°å ¶å®æ°æ®åæ¾å¨repositoryPathæå®çç®å½ä¸ä½ä¸ºç¼å²ãåç设置该åæ°çå¼å¯ä»¥ä¿è¯æå¡å¨ç¨³å®é«æçè¿è¡ï¼
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*?@desc:?å¾çå¤çå·¥å ·*?@author:?bingye*?@createTime:?-3-?ä¸å::*?@version:?v1.0*/public?class?ImageUtil?{
/
***?å°å¾çåå°å®¢æ·ç«¯
*?@author:?bingye
*?@createTime:?-3-?ä¸å::
*?@history:
*?@param?image
*?@param?response?void
*/
public?static?void?writeImage(byte[]?image,HttpServletResponse?response){
if(image==null){
return;
}
byte[]?buffer=new?byte[];
InputStream?is=null;
OutputStream?os=null;
try?{
is=new?ByteArrayInputStream(image);
os=response.getOutputStream();
while(is.read(buffer)!=-1){
os.write(buffer);
os.flush();
}
}?catch?(IOException?e)?{
e.printStackTrace();
}?finally{
try?{
if(is!=null){ is.close();}
if(os!=null){ os.close();}
}?catch?(IOException?e)?{
e.printStackTrace();
}
}
}
/
***?è·åæå®è·¯å²å¾ç
*?@author:?bingye
*?@createTime:?-3-?ä¸å::
*?@param?filePath
*?@param?response?void
*/
public?static?void?writeImage(String?filePath,HttpServletResponse?response){
File?imageFile=new?File(filePath);?
if(imageFile!=null?imageFile.exists()){
byte[]?buffer=new?byte[];
InputStream?is=null;
OutputStream?os=null;
try?{
is=new?FileInputStream(imageFile);
os=response.getOutputStream();
while(is.read(buffer)!=-1){
os.write(buffer);
os.flush();
}
}?catch?(FileNotFoundException?e)?{
e.printStackTrace();
}?catch?(IOException?e)?{
e.printStackTrace();
}?finally{
try?{
if(is!=null){ is.close();}
if(os!=null){ os.close();}
}?catch?(IOException?e)?{
e.printStackTrace();
}
}
}
}
/
***?å¾çä¸ä¼ å°æ件夹
*?@author:?bingye
*?@createTime:?-3-?ä¸å::
*?@param?file
*?@param?savePath
*?@return?boolean
*/
public?static?ResultDto?uploadToLocal(CommonsMultipartFile?file,String?savePath){
if(file!=null?!file.isEmpty()){
//è·åæ件å称
String?fileName=file.getOriginalFilename();
//è·ååç¼å
String?suffixName=fileName.substring(fileName.indexOf(".")+1);
//æ°å称
String?newFileName=System.currentTimeMillis()+"."+suffixName;
//æ°æ件路å²
String?filePath=savePath+newFileName;
//è·ååå¨æ件路å¾
File?fileDir=new?File(savePath);
if(!fileDir.exists()){
//å¦ææ件夹没æï¼æ°å»º
fileDir.mkdirs();
}
FileOutputStream?fos=null;
try?{
fos=new?FileOutputStream(filePath);
fos.write(file.getBytes());
fos.flush();
return?ResultUtil.success("UPLOAD_SUCCESS",?URLEncoder.encode(newFileName,"utf-8"));
}?catch?(Exception?e)?{
e.printStackTrace();
return?ResultUtil.fail("UPLOAD_ERROR");
}?finally{
try?{
if(fos!=null){
fos.close();
}
}?catch?(IOException?e)?{
e.printStackTrace();
return?ResultUtil.fail("UPLOAD_ERROR");
}
}
}
return?ResultUtil.fail("UPLOAD_ERROR");
}
}
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é¦å å¨JSPä¸æ¾ä¸ä¸ªFILEçæ ç¾è¿äºæé½ä¸è¯´äºï¼ä½ ä¹ä¸å®æç½ï¼æç´æ¥æå¤çè¿ç¨ç»ä½ åè¿å»
ææå ¶ä¸åå°æ°æ®åºä¸çå 容å é¤äºï¼ä½ æ¹ä¸ä¸å°±è½ç¨
/
***
*ä¸ä¼ å¾ç
*@paramservlet
*@paramrequest
*@paramresponse
*@return
*@throwsException
*/
//è¿éææ¯åæ¥ä¸ä¼ çï¼ä½ éæ
publicsynchronizedStringimportPic(HttpServletservlet,HttpServletRequestrequest,HttpServletResponseresponse)throwsException{
SimpleDateFormatformatDate=newSimpleDateFormat("yyyyMM");
Datenowtime=newDate();
Stringformatnowtime=formatDate.format(nowtime);
Fileroot=newFile(request.getRealPath("/")+"uploadfile/images/"+formatnowtime+"/");//åºä¿è¯å¨æ ¹ç®å½ä¸ææ¤ç®å½çåå¨å¦æ没æï¼ä¸é¢åä¸å建æ°çæ件夹
if(!root.isDirectory())
{
System.out.println("å建æ°æ件夹æå"+formatnowtime);
root.mkdir();
}
intreturnflag=0;
SmartUploadmySmartUpload=newSmartUpload();
intfile_size_max=;
Stringext="";
Stringurl="uploadfile/images/"+formatnowtime+"/";
//åªå 许ä¸è½½æ¤ç±»æ件
try{
//åå§å
mySmartUpload.initialize(servlet.getServletConfig(),request,response);
mySmartUpload.setAllowedFilesList("jpg,gif,bmp,jpeg,png,JPG");
//ä¸è½½æ件
mySmartUpload.upload();
}catch(Exceptione){
response.sendRedirect()//è¿å页é¢
}
com.jspsmart.upload.