双表的增删改查-上传图片工具类

package com.lzl.controller;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.multipart.MultipartFile;

public class FileUtils {

/**
*
* @param response
* @param file
* @throws FileNotFoundException
*/
public static void downLoad(HttpServletResponse response, String filename) throws FileNotFoundException {
/* // 下载本地文件
String fileName = "Operator.doc".toString(); // 文件的默认保存名
*/ // 读到流中
InputStream inStream = new FileInputStream("d:\pic\"+filename);// 文件的存放路径
// 设置输出的格式
response.reset();
response.setContentType("bin");
response.addHeader("Content-Disposition", "attachment; filename="" + filename + """);

// 循环取出流中的数据
byte[] b = new byte[1024];
int len;
try {
while ((len = inStream.read(b)) > 0)
response.getOutputStream().write(b, 0, len);
inStream.close();
} catch (IOException e) {
e.printStackTrace();
}

}


/**
* 上传文件
* @param file
* @return
* @throws IllegalStateException
* @throws IOException
*/
public static String processFile(MultipartFile file) throws IllegalStateException, IOException {

// 原来的文件名称
System.out.println("file.isEmpty() :" + file.isEmpty() );
System.out.println("file.name :" + file.getOriginalFilename());

if(file.isEmpty()||"".equals(file.getOriginalFilename()) || file.getOriginalFilename().lastIndexOf('.')<0 ) {
return "";
}

String originName = file.getOriginalFilename();
String suffixName = originName.substring(originName.lastIndexOf('.'));
SimpleDateFormat sdf= new SimpleDateFormat("yyyyMMdd");
String path = "d:/pic/" + sdf.format(new Date());
File pathFile = new File(path);
if(!pathFile.exists()) {
pathFile.mkdir();
}
String destFileName = path + "/" + UUID.randomUUID().toString() + suffixName;
File distFile = new File( destFileName);
file.transferTo(distFile);//文件另存到这个目录下边
return destFileName.substring(7);


}

}