需求是，前台通过传参，确定唯一图片，然后后台在服务器磁盘中读取该图片，然后显示于前台页面上。
后台代码：
@RequestMapping("unit/bill/showeinvoice")
@ResponseBody
public void showEInvoice(HttpServletRequest request, HttpServletResponse response){
FileInputStream fis = null;
OutputStream os = null;
String filepath = path; //path是你服务器上图片的绝对路径
File file = new File(filepath);
if(file.exists()){
try {
fis = new FileInputStream(file);
long size = file.length();
byte[] temp = new byte[(int) size];
fis.read(temp, 0, (int) size);
fis.close();
byte[] data = temp;
response.setContentType("image/png");
os = response.getOutputStream();
os.write(data);
os.flush();
os.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
前台代码：
<html>
<body>
<img src="/unit/bill/showeinvoice" /> //src值就是后台controller的映射地址
</body>
</html>