package com.lzh.controller;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.UUID;

import javax.servlet.http.HttpSession;

import org.springframework.stereotype.Controller;
import org.springframework.util.Base64Utils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;


@Controller
@RequestMapping("/upload")
public class AjaxUpload {
	@RequestMapping("/img")
	@ResponseBody
	public String uploadImg(@RequestParam("image") String imgStr, HttpSession session) {

		String filePath = null;
			String uuid = UUID.randomUUID().toString().replace("-", "").toUpperCase();
			
			filePath = session.getServletContext().getRealPath("/upload");
			//不存在就创建
			File file = new File(filePath);
			if (!file.exists() && !file.isDirectory()) {
				System.out.println("文件夹不存在");
				file.mkdir();
			}
			
			filePath = filePath + "\\" + uuid + ".jpg";
			try {
			//俩种方式解密Base64 后者更简单
		/*	// Base64
			byte[] b;
				b = decoder.decodeBuffer(imgStr.split(",")[1]);

				for (int i = 0; i < b.length; ++i) {
					if (b[i] < 0) {
						b[i] += 256;
					}
				}
				*/
				//因为BASE64Decoder的jar问题，此处使用spring框架提供的工具包
	            byte[] b = Base64Utils.decodeFromString(imgStr.split(",")[1]);
				System.out.println(filePath);
				OutputStream out = new FileOutputStream(filePath);
				out.write(b);
				out.flush();
				out.close();
			} catch (Exception e) {
				String json = "{\"result\":\"服务器异常\"}";
				return json;
			}
		String imgePath = "upload/" + uuid + ".jpg";
		String json = "{\"result\":\"ok\",\"file\":\""+imgePath+"\"}";
		System.out.println(json);
		return json;
	}
}