commons-fileupload-1.2.2.jar和commons-io-2.0.1.jar

（maven项目可以使用

<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.1</version>
</dependency>

）

2、在springMVC的配置文件中添加以下代码

<!-- 上传文件拦截，设置最大上传文件大小 10M=10*1024*1024(B)=10485760 bytes -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="10485760" />
</bean>

3、Controller代码

/*
* 图片命名格式
*/
private static final String DEFAULT_SUB_FOLDER_FORMAT_AUTO = "yyyyMMddHHmmss";

/*
* 放置上传图片的文件夹！
*/
private static final String UPLOAD_PATH="/upload/img/";

@RequestMapping("/uploadImg")
public void uplodaImg(@RequestParam("upload")MultipartFile file,HttpServletRequest request, HttpServletResponse response, @RequestParam("CKEditorFuncNum")String CKEditorFuncNum)
throws IllegalStateException, IOException {

PrintWriter out =response.getWriter();
String fileName=file.getOriginalFilename();
String uploadContentType =file.getContentType();
String expandedName ="";
if (uploadContentType.equals("image/pjpeg")
|| uploadContentType.equals("image/jpeg")) {
// IE6上传jpg图片的headimageContentType是image/pjpeg，而IE9以及火狐上传的jpg图片是image/jpeg
expandedName = ".jpg";
} else if (uploadContentType.equals("image/png")
|| uploadContentType.equals("image/x-png")) {
// IE6上传的png图片的headimageContentType是"image/x-png"
expandedName = ".png";
} else if (uploadContentType.equals("image/gif")) {
expandedName = ".gif";
} else if (uploadContentType.equals("image/bmp")) {
expandedName = ".bmp";
} else {
out.println("<script type=\"text/javascript\">");
out.println("window.parent.CKEDITOR.tools.callFunction(" + CKEditorFuncNum
+ ",''," + "'文件格式不正确（必须为.jpg/.gif/.bmp/.png文件）');");
out.println("</script>");
return ;
}
if (file.getSize()> 600 * 1024) {
out.println("<script type=\"text/javascript\">");
out.println("window.parent.CKEDITOR.tools.callFunction(" + CKEditorFuncNum
+ ",''," + "'文件大小不得大于600k');");
out.println("</script>");
return ;
}
DateFormat df = new SimpleDateFormat(DEFAULT_SUB_FOLDER_FORMAT_AUTO);
fileName = df.format(new Date())+expandedName;

/** 构建上传图片的保存目录* */
String saveDir = UPLOAD_PATH+ fileName;  //相当于("/upload/img/"+fileName)
/** 得到文件保存目录的真实路径* */

/**一定要注意这里，这里的路径就是上传图片所在的项目根路径，在编译后的文件夹里面，前端可以根据wepapp下的路径直接取即可。

*不确定的话，就打印出这句话，然后看看下面的配置的前端是怎么取到的

*/
String imgRealPathDir = request.getSession().getServletContext().getRealPath(saveDir);

File targetFile = new File(imgRealPathDir);

if (!targetFile.exists()) {
targetFile.mkdirs();
}

file.transferTo(targetFile);//注意，项目经常会在这里出现错误，错误的原因一般都是配的上传路径或者前端获取的路径不对，一定要注意这里

// 返回"图像"选项卡并显示图片 request.getContextPath()为web项目名,只适合jsp页面使用，不适用于后台Java代码
out.println("<script type=\"text/javascript\">");
out.println("window.parent.CKEDITOR.tools.callFunction(" + CKEditorFuncNum
+ ",'" + request.getContextPath()+"/upload/img/" + fileName + "','')");
out.println("</script>");

return ;
}