转载http://www.cnblogs.com/WarBlog/p/4838255.html
html5图片上传【文件上传】
在网上找了很多资料,主要也就2种
1.from表单提交的方式
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<form
action= "pushUserIcon" method= "post" enctype= "multipart/form-data" > <table> <tr> <td
width= "50" align=left>图片:</td> <td><input
type= "file" name= "file" /></td> </tr> <tr> <td
width= "50" align= "left" >用户id:</td> <td><input
type= "text" name= "userId" /></td> </tr> <tr> <td><input
type= "submit" >
</td> </tr> </table> </form> |
注意: enctype="multipart/form-data" 必须要填
1.1.Java页面直接提交:
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@RequestMapping(value= "/pushUserIcon" ,method=RequestMethod.POST) @ResponseBody public String
pushUserIcon(HttpServletRequest request, HttpServletResponse response) throws IOException,BaseException { String
result = null ; String
userId = request.getParameter( "userId" ); try { //转型为MultipartHttpRequest(重点的所在) MultipartHttpServletRequest
multipartRequest = (MultipartHttpServletRequest) request; //获得第1张图片(根据前台的name名称得到上传的文件) MultipartFile
file = multipartRequest.getFile( "file" ); result
= uploadImageServic.uploadFile(file, request, userId); System. out .println( "result:" +
result); response.setContentType( "text/html;charset=utf8" ); response.getWriter().write( "result:" +
result); } catch (Exception
e){ BaseException
baseException = new BaseException(e); baseException.setErrorMsg( "Upload
API Exception" ); throw baseException; } return null ; } |
1.2.原生js 和jQuery的网上有很多,这里就不多说了。
1.2.1. fromData创建的两种方式
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var formData
= new FormData($( "#myForm" )[0]); //用form
表单直接 构造formData 对象; 就不需要下面的append 方法来为表单进行赋值了。 //var
formData = new FormData();//构造空对象,下面用append 方法赋值。 //
formData.append("policy", ""); //
formData.append("signature", ""); //
formData.append("file", $("#file_upload")[0].files[0]); |
2.不用from表单提交:
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<table
style= "border:
1px solid black; width: 100%" > <tr> <td
width= "50" align=left>图片:</td> <td><input
type= "file" id= "imageFile" name= "img" multiple= "multiple" /></td> <td> <input
type= "button" value= "调用" onclick= "pushImg()" /> </td> </tr> </table> |
HTML就这些,我想大家应该都能看懂,下面就要说说这2种提交方式,Ajax是如何编码?【from表单提交方式也可以使用js或者直接提交页面刷新】
Ajax编码也有2种:
1.原生js
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function
sub() { var file
= document.getElementById( "imageFile" ); var files
= file.files; for ( var i
= 0 ; i < files.length;i++) { uploadFile(files[i]); } } var xhr
= null ; function
uploadFile(file) { xhr
= new XMLHttpRequest(); /*
xhr.addEventListener("error", uploadFailed, false); xhr.addEventListener("abort",
uploadCanceled, false); */ xhr.open( "post" , "upload/" , true ); //访问控制器是upload,后面必须加'/'否则会报错"org.apache.catalina.connector.RequestFacade
cannot be cast to org.springframework.web.multipart.Mult...",但是如果是多级的URL【例如XX/XXX/00/upload/0】又没问题了. var fd
= new FormData(); fd.append( "userID" , "1" ); fd.append( "errDeviceType" , "001" ); fd.append( "errDeviceID" , "11761b4a-57bf-11e5-aee9-005056ad65af" ); fd.append( "errType" , "001" ); fd.append( "errContent" , "XXXXXX" ); fd.append( "errPic" ,
file); xhr.send(fd); xhr.onreadystatechange
= cb; } function
cb() { if (xhr.status
== 200) { var b
= xhr.responseText; if (b
== "success" ){ alert( "上传成功!" ); } else { alert( "上传失败!" ); } } } |
2.jquery
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function
pushImg(obj) { debugger; var url
= "upload/" ; //访问控制器是upload,后面必须加'/'否则会报错"org.apache.catalina.connector.RequestFacade
cannot be cast to org.springframework.web.multipart.Mult...",但是如果是多级的URL【例如XX/XXX/00/upload/0】又没问题了. var param
= $( "#errorParameter" ).val(); var files
= $( "#imageFile" ). get (0).files[0]; //获取file控件中的内容 var fd
= new FormData(); fd.append( "userID" , "1" ); fd.append( "errDeviceType" , "001" ); fd.append( "errDeviceID" , "11761b4a-57bf-11e5-aee9-005056ad65af" ); fd.append( "errType" , "001" ); fd.append( "errContent" , "XXXXXX" ); fd.append( "errPic" ,
files); $.ajax({ type: "POST" , contentType: false , //必须false才会避开jQuery对
formdata 的默认处理 , XMLHttpRequest会对 formdata 进行正确的处理 processData: false , //必须false才会自动加上正确的Content-Type url:
url, data:
fd, success:
function (msg) { debugger; var jsonString
= JSON.stringify(msg); $( "#txtTd" ).text(jsonString) alert(jsonString); }, error:
function (msg) { debugger; alert( "error" ); } }); } |
现在前端的就应该差不多了,现在就是接口了,我的参数和访问路径都好了,现在就差接口服务了:
spring mvc框架:
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@RequestMapping(value
= { "upload" }) public void pushErrorData(HttpServletRequest
request, HttpServletResponse
response) throws BaseException { String
userID=request.getParameter( "userID" ); //
转型为MultipartHttpRequest(重点的所在)这个就是上面ajax中提到如果直接访问此接口而不加"/",此转型就会报错 MultipartHttpServletRequest
multipartRequest = (MultipartHttpServletRequest) request; //MultipartFile
file = multipartRequest.getFiles("errPic");//获取文件集合 对应 jquery $("#imageFile").get(0).files //
获得第1张图片(根据前台的name名称得到上传的文件) MultipartFile
file = multipartRequest.getFile( "errPic" ); //对应
jquery $("#imageFile").get(0).files[index] Map<String,
Object> map = new HashMap<String,
Object>(); if ( null !=file
&& !file.isEmpty()) { try { map
= Common.uploadFile(file); } catch (IOException
e) { BaseException
baseException = new BaseException(e); //baseException.setErrorMsg(imgErrorMsg); throw baseException; } } } /** *
图片上传 * *
@param file *
@return *
@throws IOException *
@throws BaseException */ public static Map<String,
Object> uploadFile(MultipartFile file) throws
IOException, BaseException { String
fail = ConfigBundleHelper.getValue( "busConfig" , "fail" ); //上传失败状态 String
success = ConfigBundleHelper.getValue( "busConfig" , "success" ); //上传成功状态 String
errorMsg = ConfigBundleHelper.getValue( "busConfig" , "imgErrorMsg" ); //上传错误信息 String
filePath = ConfigBundleHelper.getValue( "busConfig" , "filePath" ); //上传路径,本来是相对路径,但是在发布后路径会创建在tomcat的bin目录下,所以接口上传的路径是一个难题,我用的是绝对路径,等到发布到Linux环境中,通过配置文件修改路径为Linux中的资源地址【防止工程删除而资源文件不会丢失】,然后重新发布工程时再通过Linux的命令把我们需要的资源文件导入到我们发布的工程项目中。 String
size = ConfigBundleHelper.getValue( "busConfig" , "fileSize" ); String
interfaceService = ConfigBundleHelper.getValue( "busConfig" , "interfaceService" ); long maxFileSize
= (Integer.valueOf(size)) * 1024 * 1024; String
suffix = file.getOriginalFilename().substring( file.getOriginalFilename().lastIndexOf( "." )); long fileSize
= file.getSize(); Map<String,
Object> map = new HashMap<String,
Object>(); if (suffix. equals ( ".png" )
|| suffix. equals ( ".jpg" ))
{ if (fileSize
< maxFileSize) { //
System.out.println("fileSize"+fileSize); String
fileName = file.getOriginalFilename(); fileName
= new String(fileName.getBytes( "ISO-8859-1" ), "UTF-8" ); File
tempFile = new File(filePath, new Date().getTime() +
fileName); try { if (!tempFile.getParentFile().exists())
{ tempFile.getParentFile().mkdirs(); //如果是多级文件使用mkdirs();如果就一层级的话,可以使用mkdir() } if (!tempFile.exists())
{ tempFile.createNewFile(); } file.transferTo(tempFile); } catch (IllegalStateException
e) { BaseException
baseException = new BaseException(e); baseException.setErrorMsg(errorMsg); throw baseException; } map.put( "SUCESS" ,
success); map.put( "data" ,interfaceService
+ filePath + new Date().getTime()
+ tempFile.getName()); } else { map.put( "SUCESS" ,
fail); map.put( "data" , "Image
too big" ); } } else { map.put( "SUCESS" ,
fail); map.put( "data" , "Image
format error" ); } return map; } |
这是我在工作中所遇到到问题,分享给大家,希望大家不会在这个问题上花费大量的时间。谢谢