JAVA实现读取图片

package cn.kgc.ssm.common; import java.io.*; /**
* @author
* @create 2019-08-15 9:36
**/
public class DDD {
/**
* 读取图片 返回一个图片的字节数组
* @param path
* @return
*/
public static byte[] imgArray(String path) {
//字节输入流
InputStream inputStream = null;
//字节缓冲流数组
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
try {
inputStream = new FileInputStream(path);
byte[] b = new byte[1024];
int len = -1;
//循环读取
while ((len = inputStream.read(b)) != 1) {
byteArrayOutputStream.write(b, 0, len);
}
//返回byteArrayOutputStream数组
return byteArrayOutputStream.toByteArray();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
//关闭流
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
} public static void writeImg(byte[]array,String path){
//创建一个字节输出流
DataOutputStream dataOutputStream = null;
try {
dataOutputStream = new DataOutputStream(new FileOutputStream(path));
//将字节数组
dataOutputStream.write(array);
} catch (IOException e) {
e.printStackTrace();
}finally {
try {
//关闭
dataOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} /**
* 读取二进制保存的图片 放到数组里
* @param path
* @return
*/
public static byte[] imageIn(String path){
//创建一个字节输出流
DataInputStream dataInputStream = null;
try {
dataInputStream = new DataInputStream(new FileInputStream(path));
//创建一个字节数组 byte的长度等于二进制图片的返回的实际字节数
byte[] b = new byte[dataInputStream.available()];
//读取图片信息放入这个b数组
dataInputStream.read(b);
return b;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally {
try {
//关闭流
dataInputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
} /**
* 读取二进制保存的图片 输出图片
* @param img
* @param path
*/
public static void writImg(byte[]img,String path){
//创建一个字节输出流
OutputStream outputStream = null;
try {
outputStream = new FileOutputStream(path);
//将图片输处到流中
outputStream.write(img);
//刷新
outputStream.flush();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally {
try {
//关闭
outputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} /**
* main方法
* @param args
*/
public static void main(String[] args) {
//获取图片 将图片信息把存到数组b中
byte[] b = DDD.imgArray("D:\\5.JPG");
//通过数组B写到文件中
DDD.writImg(b,"img.txt");
//读取二进制文件保存到一个数组中
byte[] c = DDD.imageIn("img.txt");
//通过数组c 输出图片
DDD.writImg(c,"img.jpg");
}
}