JAVA Spring 返回图像字节 - 错误 406 不可接受

Question

我有下一期 - 每张图片发送请求：

<img src="getImage/9.jpg"/>

Spring MVC 控制器：

    @Secured( "ROLE_ADMIN")
    @RequestMapping(value = "/getImage/{img_name:.+}")
    public byte[] getImage(@PathVariable String img_name)  {

        byte[] data;

        try {
            String realpath = "D:\Project\images\" + img_name;
            Path path = Paths.get(realpath);
            data = Files.readAllBytes(path)


        }catch (IOException e){
            data = null;
        }

        return data;
    }

在浏览器方面，我收到下一个错误：

406 Not Acceptable

出现这种问题的原因可能是什么？我应该从服务器端发送什么数据才能使 <img src="getImage/9.jpg"?> 正常工作。

Answer 1

请在注册 ByteArrayHttpMessageConverter

的 spring-context.xml 文件中添加此代码

<mvc:annotation-driven> <mvc:message-converters> <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"> <property name="supportedMediaTypes"> <list> <value>image/jpeg</value> <value>image/png</value> </list> </property> </bean> </mvc:message-converters> </mvc:annotation-driven

而 class 应该是

 @Secured( "ROLE_ADMIN")
@RequestMapping(value = "/getImage/{img_name:.+}")
public  ResponseEntity<byte[]> getImage(@PathVariable String img_name)
        throws InternalServerError {

    byte[] data;
    try {
        String realpath = "D:\Project\images\" + img_name;
        Path path = Paths.get(realpath);
        data = Files.readAllBytes(path)


    }catch (IOException e){
        data = null;
    }

    final HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.IMAGE_JPEG);
    return new ResponseEntity<byte[]>(data , headers, HttpStatus.OK);
}

JAVA Spring 返回图像字节 - 错误 406 不可接受

JAVA Spring returning image bytes - Error 406 not acceptable

java

base64

spring

image

spring-mvc