java - 在 Jersey 中显示图像 ExceptionMapper

Question

我尝试为 CompletionException 编写自定义异常映射器，并在出现此异常时显示图像。这是我的映射器:

@Provider
public class CustomCompleteExceptionManager implements ExceptionMapper<CompletionException> {

    @Override
    public Response toResponse(CompletionException e) {
        return Response
                .status(Response.Status.BAD_REQUEST)
                .entity(Paths.get("error.png").toFile())
                .type("image/img")
                .build();
    }

当我的代码抛出 CompletionException 但浏览器不显示 error.png 时，会调用 toResponse 方法。我收到错误:

This site can’t be reached

The webpage at http://localhost:8080/cf/point might be temporarily down or it may have moved permanently to a new web address.

当我只将字符串消息写入 Response 时，它工作正常:

@Provider
public class CustomCompleteExceptionManager implements ExceptionMapper<CompletionException> {

    @Override
    public Response toResponse(CompletionException e) {
        return Response
                .status(Response.Status.BAD_REQUEST)
                .entity(e.getMessage())
                .build();
    }

可能是什么问题？

Answer 1

响应中设置的媒体类型错误。
它应该是 .type("image/png") 而不是 image/img。

这是我在本地测试时的代码。

return Response
            .status(Response.Status.BAD_REQUEST)
            .entity(Paths.get("/home","kishore","Pictures","Meme.png").toFile())
            .type("image/png")
            .build();