把前端图片存到数据库,再从数据库取出来显示

 1 import java.io.FileInputStream;
 2 
 3 public class Base64Test {
 4 
 5     public static void main(String[] args) throws Exception {
 6         //指定地址获取图片
 7         FileInputStream fi = new FileInputStream("C:\\Users\\hengc\\Pictures\\$.jpg");
 8         byte[] buffer = new byte[fi.available()];
 9         System.out.println("buffer:"+buffer+"\n");
10         fi.read(buffer);
11         fi.close();
12         //转成base编码的字符串
13         String resultStr = org.apache.commons.codec.binary.Base64.encodeBase64String(buffer);
14         System.out.println("resultStr:\n"+resultStr+"\n");
15         
16         //数据库存储的形式
17         byte[] resultDE = org.apache.commons.codec.binary.Base64.decodeBase64(resultStr);
18         System.out.println("resultDE:"+resultDE+"\n");
19         
20         //从数据库取出后再次转换成base64的字符串
21         String reStr = org.apache.commons.codec.binary.Base64.encodeBase64String(resultDE);
22         System.out.println("reStr:\n"+reStr+"\n");
23     }
24 
25 }

显示图片

在html里的img标签的src属性前加入     data:image/jpeg;base64,    后面拼接base64字符串即可

例如:

<img src="data:image/jpeg;base64,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">

图片如图显示:

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转载自www.cnblogs.com/henglan/p/9669982.html
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