后台返回输出流的方式显示图片

Posted 2021-03-24 lazyli

前端请求路径：

<img  src="<%=basePath%>commericalPart/readPartImage">
后台：

 /**
     * 读取图片
     */
    @RequestMapping("/readPartImage")
    @ResponseBody
    public void readPartImage(HttpServletRequest request, HttpServletResponse response)throws Exception{
        String path = request.getParameter("url");
        File file = new File("E:/lazyli/image/part/本田/车身/1230474 防飞溅-17.jpg");
        InputStream is = new FileInputStream(file);
        byte[] bytes = new byte[is.available()];
        is.read(bytes);
        is.close();
        //ByteArrayOutputStream baos = new ByteArrayOutputStream();
        OutputStream os = response.getOutputStream();
        /*int ch = 0;
        while (-1 != (ch = is.read())){
            os.write(bytes,0,ch);
        }*/
        response.setContentType("image/*");
        os.write(bytes);
        os.close();
    }

　　第二种方式

 

/**
 * 读取图片
 */
@RequestMapping("/readPartImage")
@ResponseBody
public void readPartImage(HttpServletRequest request, HttpServletResponse response)throws Exception{
    String path = request.getParameter("url");
    File file = new File("E:/lazyli/image/part/本田/车身/1230474 防飞溅-17.jpg");
    InputStream is = new FileInputStream(file);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    OutputStream os = response.getOutputStream();
    int ch = 0;
    while (-1 != (ch = is.read())){
        baos.write(ch);
    }
    os.write(baos.toByteArray());
    is.close();
    baos.close();
    os.close();
}