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Java 如何在Spring boot中将映像作为响应发送?_Java_Spring_Spring Boot_Spring Restcontroller - Fatal编程技术网

Java 如何在Spring boot中将映像作为响应发送?

Java 如何在Spring boot中将映像作为响应发送?,java,spring,spring-boot,spring-restcontroller,Java,Spring,Spring Boot,Spring Restcontroller,我是spring boot(restController)和angular的初学者,我想用以下方法向我的客户机(angular)发送一个图像: @RestController public class ProductRestController { @Autowired private ProductRepository pr; @GetMapping (path = "/ photoProduit / {id}", produces = org.sprin

我是spring boot(restController)和angular的初学者,我想用以下方法向我的客户机(angular)发送一个图像:

@RestController public class ProductRestController { 
    @Autowired private ProductRepository pr;
    @GetMapping (path = "/ photoProduit / {id}", produces = org.springframework.http.MediaType.IMAGE_PNG_VALUE)
     public byte [] getPhoto (@PathVariable Long id) throws IOException { 
        Product p = pr.findById (id) .get (); return Files.readAllBytes (Paths.get (System.getProperty ("user.home") + "/ ecom / produits /" + p.getPhotoName ()));
        
    }
 }

但是URL返回一个带有此错误的代码500

There was an unexpected error 
(type = Internal Server Error, status = 500). C: \ Users \ Gonan \ ecom \ products \ unknow.png java.nio.file.NoSuchFileException: C: \ Users \ Gonan \ ecom \ produits \ unknow.png

您能帮我吗???

根据您发布的异常,您试图读取的图像路径似乎找不到

该方法也有一些修正,以下是我是如何做到这一点的:

导入org.springframework.core.io.ByteArrayResource;
导入org.springframework.core.io.Resource;
@GetMapping(value=“/image”,products=MediaType.image\u JPEG\u值)
public ResponseEntity image()引发IOException{
final ByteArrayResource inputStream=新建ByteArrayResource(Files.readAllBytes(path.get(
“/home/silentsudo/Videos/dum1111b.jpg”
)));
返回响应性
.status(HttpStatus.OK)
.contentLength(inputStream.contentLength())
.主体(输入流);
}

请确保
path.get(…)
的URI有效,否则您仍将获得
java.nio.file.NoSuchFileException

根据您发布的异常,似乎找不到您尝试读取的图像路径

该方法也有一些修正,以下是我是如何做到这一点的:

导入org.springframework.core.io.ByteArrayResource;
导入org.springframework.core.io.Resource;
@GetMapping(value=“/image”,products=MediaType.image\u JPEG\u值)
public ResponseEntity image()引发IOException{
final ByteArrayResource inputStream=新建ByteArrayResource(Files.readAllBytes(path.get(
“/home/silentsudo/Videos/dum1111b.jpg”
)));
返回响应性
.status(HttpStatus.OK)
.contentLength(inputStream.contentLength())
.主体(输入流);
}

请确保
path.get(…)
的URI有效,否则您仍将获得
java.nio.file.NoSuchFileException

我相信他找不到图像。因此,要么这个unknow.png图像不存在,要么为unknown.png图像指定的路径不正确。我相信他找不到该图像。因此,要么此unknow.png图像不存在,要么为unknown.png图像指定的路径不正确。回答正确,thx回答正确,thx