项目中用到了Kindeditor，需要把图片上传到服务器上，然后并显示出来。以前一直显示不出来，一看路径是本地磁盘的路径这样是肯定显示不出来的，所以需要在后台把saveUrl修改一下就可以了。需要修改成相对路径，这样图片就能正常显示了
以下为Java代码：
public Object fileUpload(){ String savePath=this.getCurSession().getServletContext().getRealPath("")+"/attached"; //文件保存路径 String saveUrl=this.getCurRequest().getContextPath()+"/attachedimage/";//相对路径 //String saveUrl=this.getCurSession().getServletContext().getRealPath("")+"/attachedimage/";//绝对路径 HttpServletResponse response=ServletActionContext.getResponse(); PrintWriter out = null; //输出流 try { out = response.getWriter(); } catch (IOException e1) { e1.printStackTrace(); } //定义能上传的文件格式 HashMap<String, String> extMap=new HashMap<String, String>(); extMap.put("image", "gif,jpg,jpeg,png,bmp"); extMap.put("flash", "swf,flv"); extMap.put("media", "swf,flv,mp3,wav,wma,wmv,mid,avi,mpg,asf,rm,rmvb"); extMap.put("file", "doc,docx,xls,xlsx,ppt,htm,html,xml,txt,zip,rar,gz,bz2"); //最大的文件大小 long maxSize = 1000000; response.setContentType("text/html; charset=UTF-8"); if(!ServletFileUpload.isMultipartContent(this.getCurRequest())){ return getError("请选择文件"); } File uploadDir=new File(savePath); if(!uploadDir.isDirectory()){ uploadDir.mkdirs(); //return getError("上传目录不存在"); } if(!uploadDir.canWrite()){ return getError("没有权利"); } String dirName=this.getCurRequest().getParameter("dir"); if(dirName==null){ dirName="image"; } if(!extMap.containsKey(dirName)){ return getError("目录名不正确"); } savePath+=dirName+"/"; //saveUrl+=dirName+"/"; File saveDirFile=new File(savePath); if(!saveDirFile.exists()){ saveDirFile.mkdirs(); } SimpleDateFormat sdf=new SimpleDateFormat("yyyyMMdd"); String ymd=sdf.format(new Date()); savePath+=ymd+"/"; saveUrl+=ymd+"/"; File dirFile=new File(savePath); if(!dirFile.exists()){ dirFile.mkdirs(); } FileItemFactory factory=new DiskFileItemFactory(); ServletFileUpload upload=new ServletFileUpload(factory); upload.setHeaderEncoding("UTF-8"); MultiPartRequestWrapper wrapper = (MultiPartRequestWrapper) this.getCurRequest(); String fileName=wrapper.getFileNames("imgFile")[0]; File file=wrapper.getFiles("imgFile")[0]; String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase(); if (!Arrays.<String> asList(extMap.get(dirName).split(",")).contains(fileExt)) { out.println(getError("上传文件扩展名是不允许的扩展名。\n只允许" + extMap.get(dirName) + "格式。")); return null; } if(file.length()>maxSize){ out.print(getError("上传文件大小超过限制")); return null; } String newImgName = sdf.format(new Date()) + "_" + new Random().nextInt(1000) + "." + fileExt; byte[] buffer = new byte[1024]; FileOutputStream fos; // 获取内存中当前文件输入流 InputStream in; try { fos = new FileOutputStream(savePath + "/" + newImgName); in = new FileInputStream(file); int num = 0; while ((num = in.read(buffer)) > 0) { fos.write(buffer, 0, num); } in.close(); fos.close(); } catch (FileNotFoundException e1) { e1.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } com.alibaba.fastjson.JSONObject obj = new com.alibaba.fastjson.JSONObject(); obj.put("error", 0); obj.put("url", saveUrl + "/" + newImgName); out.println(obj.toJSONString()); return null; }