java 文件上传数据库

package com.yunztec.eprj.util;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class FileOperateUtil {
 
 
 private static FileOperateUtil fpu=new FileOperateUtil();
 
 
 public static FileOperateUtil getInstance(){
  return fpu;
 }
 
 
 
 public byte[] getBytes(File file){  
       byte[] buffer = null;  
          try {     
              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;  
 }
 
 
 public String writeFileToService(byte[] bt, String filePath,String fileName) {  
        BufferedOutputStream bos = null;  
        FileOutputStream fos = null;  
        File file = null;  
        try {  
            File dir = new File(filePath);
            System.out.println(dir.exists());
            if(!dir.exists()){//判断文件目录是否存在  
                dir.mkdirs();  
            }  
            file = new File(filePath+"\\"+fileName);  
            fos = new FileOutputStream(file);  
            bos = new BufferedOutputStream(fos);  
           bos.write(bt);  
       } 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();  
                }  
            }  
        }  
        return filePath+"\\"+fileName;
 　　}
}