jsp 通过流的方式读取图片

页面：

<img id="mutationImage" src="${pageContext.request.contextPath}/two-check/validate-order-mutation/seeChrom.action?chromId=${request.chromLocation}&t=<s:property value='verifyResultNote'/>"/>

action:

public String seePic(){
        HttpServletResponse response = ServletActionContext.getResponse();
        //获取路径
        String attPath=ReadPropertiesUtils.readProperties("path.properties", "LAB_ORDER_PIC");
        if(null != id && id > 0){
            String picName = mutationService.findpicName(id);
            if(null != picName && !"".equals(picName)){
                try {
                 inputStream=new FileInputStream(new File(attPath+picName));
                 response.setContentType("image/*"); // 设置返回的文件类型
                 OutputStream toClient = response.getOutputStream(); // 得到向客户端输出二进制数据的对象
                 int len;
                 byte[] bs = new byte[1024];
                 while ((len = inputStream.read(bs)) != -1) {
                     toClient.write(bs, 0, len);
                 }
                 toClient.flush();
                 toClient.close();

                    
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }