html img动态获取后台的图片资源-例子
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2022-07-08 12:07:02
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我们需要动态获取后台的图片，现举例如下：
后台的代码:
<%@ page contentType="text/html; charset=UTF-8" %> <html> <head> <title>下载img</title> </head> <body> <img src="http://localhost:8400/mlams/img1.jsp?NoDecorate=1" widht="300" height="250"/> </body> </html>
后台的代码:
<%@ page contentType="text/html; charset=UTF-8" %>
<%@page import="java.io.*" %>
<%
try{
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
String img = "D:/jxgl1/mlams/WebRoot/img.jpg";
BufferedInputStream bis = null;
OutputStream os = null;
FileInputStream fileInputStream = new FileInputStream(new File(img));
bis = new BufferedInputStream(fileInputStream);
byte[] buffer = new byte[512];
response.reset();
response.setCharacterEncoding("UTF-8");
//不同类型的文件对应不同的MIME类型
response.setContentType("image/*");
//文件以流的方式发送到客户端浏览器
//response.setHeader("Content-Disposition","attachment; filename=img.jpg");
//response.setHeader("Content-Disposition", "inline; filename=img.jpg");
response.setContentLength(bis.available());
os = response.getOutputStream();
int n;
while ((n = bis.read(buffer)) != -1) {
os.write(buffer, 0, n);
}
bis.close();
os.flush();
os.close();
}catch(Exception e){
e.printStackTrace();
}
%>
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