java 文件上传数据库
时间：2021-07-01 10:21:17
帮助过：17人阅读
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;
}
}
总结：
1.上传: file----->byte[]
2.下载： byte[]------->File---->存到服务器--->提供路径---->下载完成后删除服务器文件。
java 文件上传数据库
标签：sys mysql ora str pack style 二进制 filename out
