Iterator<FileItem>的使用，实现文件（图片）上传，限制图片格式，设置随机文件名

来源：互联网发布：linux redis 远程访问编辑：程序博客网时间：2024/06/01 10:53
public StringMap uploadPicture(HttpServletRequest request,                                    HttpServletResponse response)throws Exception{        StringMap map=new StringMap();        DiskFileItemFactory fac = new DiskFileItemFactory();        // 创建servlet文件上传组件        ServletFileUpload upload = new ServletFileUpload(fac);        List fileInfoList = null;        try {            fileInfoList = upload.parseRequest(request);        } catch (FileUploadException ex) {            ex.printStackTrace();        }        Iterator paramItem = fileInfoList.iterator();        Map paraMap = new HashMap();        while (paramItem.hasNext()) {   //获取域中传入的普通参数            FileItem item = paramItem.next();            if (item.isFormField()){                String filedName = item.getFieldName();                String value = "";                try {                    value = item.getString("UTF-8");                } catch (UnsupportedEncodingException e) {                    e.printStackTrace();                }                paraMap.put(filedName, value);            }        }        InetAddress addr = InetAddress.getLocalHost();        String localIp=addr.getHostAddress().toString();//获得本机IP        String  pictureUrl="";        Iterator fileItem = fileInfoList.iterator();        String[] allowedExt = new String[] { "jpg", "jpeg", "gif", "png"};        while (fileItem.hasNext()){  //获取域中传入的文件参数            FileItem item = fileItem.next();            if (!item.isFormField()) {                String filename = item.getName();    //得到文件名                String fileExt = filename.substring(filename.lastIndexOf(".") + 1);    //得到文件格式                boolean isPiceure=false;         //上传的文件是否图片                int allowedExtCount = allowedExt.length;                for (int i=0; i< allowedExtCount; i++) {                    if (allowedExt[i].toLowerCase().equals(fileExt.toLowerCase()))                        isPiceure=true;                } if (isPiceure) {                    String[] s = filename.split("\\.", 2);                    String fileName = System.currentTimeMillis()+ "." + s[1]; //s[1]为文件后缀名,这里文件名设置为随机值                    try {                        String tomcatPath = "../webapps/ROOT";    //找到tomcat目录                        File uploadDirPath = new File(tomcatPath + "/upload");                        if (!uploadDirPath.exists()) {                            uploadDirPath.mkdirs();                            File uploadDirPath_tmp = new File(tomcatPath + "/upload");                            if (!uploadDirPath_tmp.exists()) {                                uploadDirPath_tmp.mkdir();                            }                        }                        String serverpath = "http://" + localIp + ":8080"; //设置要上传的服务器地址和端口号;                        pictureUrl = serverpath + "/upload/" + fileName;    //设置全路径                        File copyfile = new File(tomcatPath + "/upload/" + fileName);                        if (!copyfile.exists()) {                            item.write(copyfile); //FileCopyUtils来自org.springframework.util.FileCopyUtils                        }                    } catch (Exception e) {                        e.printStackTrace();                    }                    map.set("msg","图片上传成功！");                    map.set("pictureUrl",pictureUrl);                }  else{                    map.set("msg","图片上传失败或图片格式不正确！");                    return map;                }            }}        return map;    }
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