package cn.edu.nchu.studentmanager.web.servlet;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import com.alibaba.fastjson.JSON;

import cn.edu.nchu.studentmanager.service.UserService;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
public class MyUploadServlet extends ControllerServlet{
	 public void SHOWImage(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		 	String userName = request.getParameter("key");//获取要上传头像UI的用户Id
		 	//根据userId从数据库中读出相应的头像path，然后用ajax返回到login.jsp
		 	UserService userService = new UserService();
		 	
		 	String path = userService.queryUserPathByUserName(userName);
		 	System.out.println("path1="+path);
		 	 //需要往浏览器写入json数据
	    	 response.setContentType("application/json;charset=utf-8");
	    	 PrintWriter out = response.getWriter();
	    	 //把对象Result转换成json数据
	    	 String jsonStr = JSON.toJSONString(path, true);
	    	 out.write(jsonStr);
	         out.close();    
    }
     public void upImage(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    	 String userId = request.getParameter("userid");//获取要上传头像UI的用户Id
       
         if(ServletFileUpload.isMultipartContent(request)) {
             //该提示符合文件上传规则，在此处对文件上传数据进行处理。

             try {
                 // 1. 创建DiskFileItemFactory对象，设置缓冲区大小和临时文件目录
                 DiskFileItemFactory factory = new DiskFileItemFactory();
                 // System.out.println(System.getProperty("java.io.tmpdir"));//默认临时文件夹

                 // 2. 创建ServletFileUpload对象，并设置上传文件的大小限制。
                 ServletFileUpload sfu = new ServletFileUpload(factory);
                 sfu.setSizeMax(10 * 1024 * 1024);// 以byte为单位 不能超过10M 1024byte =
                 // 1kb 1024kb=1M 1024M = 1G
                 sfu.setHeaderEncoding("utf-8");

                 // 3.
                 // 调用ServletFileUpload.parseRequest方法解析request对象，得到一个保存了所有上传内容的List对象。
                 @SuppressWarnings("unchecked")
                 List<FileItem> fileItemList = sfu.parseRequest(request);
                 Iterator<FileItem> fileItems = fileItemList.iterator();

                 // 4. 遍历list，每迭代一个FileItem对象，调用其isFormField方法判断是否是上传文件
                 while (fileItems.hasNext()) {
                     FileItem fileItem = fileItems.next();
                     // 普通表单元素
                     if (fileItem.isFormField()) {
                         String name = fileItem.getFieldName();// name属性值
                         String value = fileItem.getString("utf-8");// name对应的value值

                         System.out.println(name + " = " + value);
                     }
                     // <input type="file">的上传文件的元素
                     else {
                         String fileName = fileItem.getName();// 文件名称
                         System.out.println("原文件名：" + fileName);// Koala.jpg

                         String suffix = fileName.substring(fileName.lastIndexOf('.'));
                         System.out.println("扩展名：" + suffix);// .jpg

                         // 新文件名（唯一）
                         String newFileName = new Date().getTime() + suffix;
                         System.out.println("新文件名：" + newFileName);// image\1478509873038.jpg

                         // 5. 调用FileItem的write()方法，写入文件
                         File file = new File("C:\\Users\\LiuWentao\\workspace\\studentmanager\\src\\main\\webapp\\loginpage\\images\\" + newFileName);//写入文件的地址
                         System.out.println(file.getAbsolutePath());
                         fileItem.write(file);

                         // 6. 调用FileItem的delete()方法，删除临时文件
                         fileItem.delete();

                             String path = "loginpage/images/";
                             path = path+newFileName;
                             //src="${AUI_ContextPath}/loginpage/images/crm_1.gif"
                            UserService userservice = new UserService(); 
                            userservice.uploadUserTouxiangById(path, userId);
                     }

                 }
         } catch (FileUploadException e) {
             e.printStackTrace();
         } catch (Exception e) {
             e.printStackTrace();
         }

     }
   }

}