*本事例主要讲了如下几点:
* 1:将图片转换为BASE64加密字符串.
* 2:将图片流转换为BASE64加密字符串.
* 3:将BASE64加密字符串转换为图片.
* 4:在jsp文件中以引用的方式和BASE64加密字符串方式展示图片.
首先看工具类:
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream; import javax.imageio.ImageIO; import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder; /**
* @author IluckySi
* @since 20150122
*/
public class ImageUtil { private static BASE64Encoder encoder = new sun.misc.BASE64Encoder();
private static BASE64Decoder decoder = new sun.misc.BASE64Decoder(); /**
* 将图片转换为BASE64加密字符串.
* @param imagePath 图片路径.
* @param format 图片格式.
* @return
*/
public String convertImageToByte(String imagePath, String format) {
File file = new File(imagePath);
BufferedImage bi = null;
ByteArrayOutputStream baos = null;
String result = null;
try {
bi = ImageIO.read(file);
baos = new ByteArrayOutputStream();
ImageIO.write(bi, format == null ? "jpg" : format, baos);
byte[] bytes = baos.toByteArray();
result = encoder.encodeBuffer(bytes).trim();
System.out.println("将图片转换为BASE64加密字符串成功！");
} catch (IOException e) {
System.out.println("将图片转换为 BASE64加密字符串失败: " + e);
} finally {
try {
if(baos != null) {
baos.close();
baos = null;
}
} catch (Exception e) {
System.out.println("关闭文件流发生异常: " + e);
}
}
return result;
} /**
* 将图片流转换为BASE64加密字符串.
* @param imageInputStream
* @param format 图片格式.
* @return
*/
public String convertImageStreamToByte(InputStream imageInputStream, String format) {
BufferedImage bi = null;
ByteArrayOutputStream baos = null;
String result = null;
try {
bi = ImageIO.read(imageInputStream);
baos = new ByteArrayOutputStream();
ImageIO.write(bi, format == null ? "jpg" : format, baos);
byte[] bytes = baos.toByteArray();
result = encoder.encodeBuffer(bytes).trim();
System.out.println("将图片流转换为BASE64加密字符串成功！");
} catch (IOException e) {
System.out.println("将图片流转换为 BASE64加密字符串失败: " + e);
} finally {
try {
if(baos != null) {
baos.close();
baos = null;
}
} catch (Exception e) {
System.out.println("关闭文件流发生异常: " + e);
}
}
return result;
} /**
* 将BASE64加密字符串转换为图片.
* @param base64String
* @param imagePath 图片生成路径.
* @param format 图片格式.
*/
public void convertByteToImage(String base64String, String imagePath, String format) {
byte[] bytes = null;
ByteArrayInputStream bais = null;
BufferedImage bi = null;
File file = null;
try {
bytes = decoder.decodeBuffer(base64String);
bais = new ByteArrayInputStream(bytes);
bi = ImageIO.read(bais);
file = new File(imagePath);
ImageIO.write(bi, format == null ? "jpg" : format, file);
System.out.println("将BASE64加密字符串转换为图片成功！");
} catch (IOException e) {
System.out.println("将BASE64加密字符串转换为图片失败: " + e);
} finally {
try {
if(bais != null) {
bais.close();
bais = null;
}
} catch (Exception e) {
System.out.println("关闭文件流发生异常: " + e);
}
}
}
}
然后看测试类：
import java.io.InputStream; import com.ilucky.util.image.ImageUtil; /**
* 本事例主要讲了如下几点:
* 1:将图片转换为BASE64加密字符串.
* 2:将图片流转换为BASE64加密字符串.
* 3:将BASE64加密字符串转换为图片.
* 4:在jsp文件中以引用的方式和BASE64加密字符串方式展示图片.
* @author IluckySi
* @since 20150122
*/
public class MainTest { public static void main(String[] args) {
ImageUtil imageUtil = new ImageUtil(); String base64String = imageUtil.convertImageToByte("D:\\test.png", "png");
System.out.println(base64String);
imageUtil.convertByteToImage(base64String, "D:\\test2.png", "png"); InputStream is = MainTest.class.getResourceAsStream("test.png");
String base64String2 = imageUtil.convertImageStreamToByte(is, "png");
System.out.println(base64String2);
imageUtil.convertByteToImage(base64String2, "D:\\test3.png", "png");
}
}
最后看jsp文件:
<!DOCTYPE html>
<html>
<head>
<title>index.html</title>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
</head>
<body>
<!--
data表示取得数据的协定名称,image/png是数据类型名称,base64 是数据的编码方法,
逗号后面是image/png文件base64编码后的数据.
data:text/css;base64,base64编码的CSS代码
data:text/javascript,Javascript代码
data:text/javascript;base64,base64编码的Javascript代码
data:image/gif;base64,base64编码的gif图片数据
data:image/png;base64,base64编码的png图片数据
data:image/jpeg;base64,base64编码的jpeg图片数据
data:image/x-icon;base64,base64编码的icon图片数据
-->
<img src="test.png"/>
<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAFYklEQVR42sVXfUyUdRz/8XKhMZQO
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</body>
</html>