将图片转成base64字符串并在JSP页面显示的Java代码.docx
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将图片转成base64字符串并在JSP页面显示的Java代码
*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;
import;
import;
import;
import;
import;
import;
import;
import;
/**
*@authorIluckySi
*@since
*/
publicclassImageUtil{
privatestaticBASE64Encoderencoder=new;
privatestaticBASE64Decoderdecoder=new;
/**
*将图片转换为BASE64加密字符串.
*@paramimagePath图片路径.
*@paramformat图片格式.
*@return
*/
publicStringconvertImageToByte（StringimagePath,Stringformat）{
Filefile=newFile（imagePath）;
BufferedImagebi=null;
ByteArrayOutputStreambaos=null;
Stringresult=null;
try{
bi=ImageIO.read（file）;
baos=newByteArrayOutputStream（）;
ImageIO.write（bi,format==null?
"jpg":
format,baos）;
byte[]bytes=baos.toByteArray（）;
result=encoder.encodeBuffer（bytes）.trim（）;
"将图片转换为BASE64加密字符串成功！
"）;
}catch（IOExceptione）{
"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（Exceptione）{
"关闭文件流发生异常:
"+e）;
}
}
returnresult;
}
/**
*将BASE64加密字符串转换为图片.
*@parambase64String
*@paramimagePath图片生成路径.
*@paramformat图片格式.
*/
publicvoidconvertByteToImage（Stringbase64String,StringimagePath,Stringformat）{
byte[]bytes=null;
ByteArrayInputStreambais=null;
BufferedImagebi=null;
Filefile=null;
try{
bytes=decoder.decodeBuffer（base64String）;
bais=newByteArrayInputStream（bytes）;
bi=ImageIO.read（bais）;
file=newFile（imagePath）;
ImageIO.write（bi,format==null?
"jpg":
format,file）;
"将BASE64加密字符串转换为图片成功！
"）;
}catch（IOExceptione）{
"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（Exceptione）{
"关闭文件流发生异常:
"+e）;
}
}
}
}
然后看测试类：
import;
import;
/**
*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.
*@authorIluckySi
*@since
*/
publicclassMainTest{
publicstaticvoidmain（String[]args）{
ImageUtilimageUtil=newImageUtil（）;
Stringbase64String=imageUtil.convertImageToByte（"D:
\\test.png","png"）;
;
imageUtil.convertByteToImage（base64String,"D:
\\test2.png","png"）;
InputStreamis="test.png"）;
Stringbase64String2=imageUtil.convertImageStreamToByte（is,"png"）;
;
imageUtil.convertByteToImage（base64String2,"D:
\\test3.png","png"）;
}
}
最后看jsp文件:
DOCTYPEhtml>
index.html
--
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
-->
image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAFYklEQVR42sVXfUyUdRz/8XKhMZQO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5ymwZi8Y7dgNywAzPQuc3xNet3Ypv8+Bn3Y0sUqTQ3k24MM4BdZW3f9zYuKeoYNZzPQscNkRsv35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"/>
部署项目，启动服务器,访问jsp页面,会看到浏览器上有两张一样的图片.
升级会员 