<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="java.util.*,java.io.*" %>
<%@ page import="java.text.SimpleDateFormat" %>
<%@ page import="org.apache.commons.fileupload.*" %>
<%@ page import="org.apache.commons.fileupload.disk.*" %>
<%@ page import="org.apache.commons.fileupload.servlet.*" %>
<%@ page import="org.json.simple.*" %>
<%

/**
 * KindEditor JSP
 * 
 * 本JSP程序是演示程序，建议不要直接在实际项目中使用。
 * 如果您确定直接使用本程序，使用之前请仔细确认相关安全设置。
 * 
 */

//文件保存目录路径
String savePath = pageContext.getServletContext().getRealPath("/") + "attached/";
//文件保存目录URL
String saveUrl  = request.getContextPath() + "/attached/";
//定义允许上传的文件扩展名
String[] fileTypes = new String[]{"gif", "jpg", "jpeg", "png", "bmp"};
//最大文件大小
long maxSize = 1000000;

response.setContentType("text/html; charset=UTF-8");

if(!ServletFileUpload.isMultipartContent(request)){
	out.println(getError("请选择文件。"));
	return;
}
//检查目录
File uploadDir = new File(savePath);
if(!uploadDir.isDirectory()){
	out.println(getError("上传目录不存在。"));
	return;
}
//检查目录写权限
if(!uploadDir.canWrite()){
	out.println(getError("上传目录没有写权限。"));
	return;
}

FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setHeaderEncoding("UTF-8");
List items = upload.parseRequest(request);
Iterator itr = items.iterator();
while (itr.hasNext()) {
	FileItem item = (FileItem) itr.next();
	String fileName = item.getName();
	long fileSize = item.getSize();
	if (!item.isFormField()) {
		//检查文件大小
		if(item.getSize() > maxSize){
			out.println(getError("上传文件大小超过限制。"));
			return;
		}
		//检查扩展名
		String fileExt = fileName.substring(fileName.lastIndexOf(".") + 1).toLowerCase();
		if(!Arrays.<String>asList(fileTypes).contains(fileExt)){
			out.println(getError("上传文件扩展名是不允许的扩展名。"));
			return;
		}
		SimpleDateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
		String newFileName = df.format(new Date()) + "_" + new Random().nextInt(1000) + "." + fileExt;
		try{
			File uploadedFile = new File(savePath, newFileName);
			item.write(uploadedFile);
		}catch(Exception e){
			out.println(getError("上传文件失败。"));
			return;
		}

		JSONObject obj = new JSONObject();
		obj.put("error", 0);
		obj.put("url", saveUrl + newFileName);
		out.println(obj.toJSONString());
	}
}
%>
<%!
private String getError(String message) {
	JSONObject obj = new JSONObject();
	obj.put("error", 1);
	obj.put("message", message);
	return obj.toJSONString();
}
%>