文件与byte[]数组间的相互转换

雨点打透心脏的1/2处 2021-11-17 01:04 409阅读 0赞

工具类：

package io.renren.modules.job.utils;
    
    import java.io.*;
    
    public class ByteToFile {
    
    
    
        /**
         * 根据byte数组，生成文件
         */
        public static void getFile(byte[] bfile, String filePath,String fileName,String suffix) {
            BufferedOutputStream bos = null;
            FileOutputStream fos = null;
            File file = null;
            try {
                File dir = new File(filePath);
                if(!dir.exists()&&dir.isDirectory()){//判断文件目录是否存在
                    dir.mkdirs();
                }
                file = new File(filePath+"\\"+fileName+suffix);
                fos = new FileOutputStream(file);
                bos = new BufferedOutputStream(fos);
                bos.write(bfile);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (bos != null) {
                    try {
                        bos.close();
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                }
                if (fos != null) {
                    try {
                        fos.close();
                    } catch (IOException e1) {
                        e1.printStackTrace();
                    }
                }
            }
        }
        /**
         * 获得指定文件的byte数组
         */
        public static byte[] getBytes(String filePath){
            byte[] buffer = null;
            try {
                File file = new File(filePath);
                FileInputStream fis = new FileInputStream(file);
                ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
                byte[] b = new byte[1000];
                int n;
                while ((n = fis.read(b)) != -1) {
                    bos.write(b, 0, n);
                }
                fis.close();
                bos.close();
                buffer = bos.toByteArray();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return buffer;
        }
    }

测试调用：

package io.renren.zzrl_2019.controller;
    
    import io.renren.common.utils.R;
    import io.renren.modules.job.utils.ByteToFile;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import java.io.*;
    
    @Controller
    @RequestMapping("/wechatdocking")
    public class WechatDockingController {
        @Value("${zzrlfile.catalogs}")
        private String catalogs; // 磁盘盘符
    
    
        @RequestMapping("/ByteToFile")
        @ResponseBody
        public R ByteToFile(byte[] bfile,String filename,Integer sqid){
            //文件地址
            String filePath="C:/Users/lenovo/Desktop/sqlServer游标循环.txt";
            //截取后缀
            String suffix=filePath.substring(filePath.lastIndexOf("."));
            //截取名称
            filename=filePath.substring(filePath.lastIndexOf("/"),filePath.lastIndexOf("."));
            System.out.println(filename);
            ByteToFile.getFile(ByteToFile.getBytes(filePath),catalogs,filename,suffix);
            return  R.ok("成功");
        }
    
    
    }