图像无法写入 spring 的资源文件夹中

这是我的服务方法

public void CapchaString() {
                 String capchaString = UUID.randomUUID().toString();
    //         ByteArrayInputStream bais = new ByteArrayInputStream(capchaString.getBytes());
                            try {
                               BufferedImage bi=new BufferedImage(100, 100, BufferedImage.TYPE_INT_RGB);
                               Graphics g = bi.getGraphics();
                               g.drawString(capchaString, 10, 10);
                              /* File outputfile = new File("src/main/resources/output.png");*/
                               ImageOutputStream out = new FileImageOutputStream(new File("C:/Users/Saurabh/Documents/Agile maple code/JavaJ2eeTraining/src/main/resources/output.png")); 
                               ImageIO.write(bi, "png", out);

                           } catch (IOException e) {
                               throw new RuntimeException(e);
                           }

            }
    }

这是我的控制器方法

@ResponseBody
@RequestMapping(value="/photo2", method = RequestMethod.GET, produces = MediaType.IMAGE_JPEG_VALUE)
public byte[] testphoto() throws IOException {
    capchaService.CapchaString();
    Resource resource = loader.getResource("output.png");

           ImageIO.createImageInputStream(resource.getFile());
    InputStream is = new BufferedInputStream(new FileInputStream(resource.getFile()));
    return IOUtils.toByteArray(is);
}

当我使用我的服务器时，我得到HTTP 状态 500 - 类路径资源[5]无法解析为 URL，因为它不存在

org.springframework.core.io.ClassPathResource.getURL(ClassPathResource.java:177)org.springframework.core.io.AbstractFileResolvingResource.getFile(AbstractFileResolvingResource.java:48)com.agilemaple.common.controller.HelloController.testphoto(HelloController.java:174)sun.reflect.NativeMethodAccessorImpl.invoke0(Native 方法)sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)java.lang.reflect.Method.invoke(Method.java:606)org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:953)org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:844)javax.servlet.http.HttpServlet.service(HttpServlet.java:621)org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829)javax.servlet.http.HttpServlet.service(HttpServlet.java:728)org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)