带有 Spring Boot 的 JSON 和 HTML 控制器
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/27278791/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Controller for JSON and HTML with Spring Boot
提问by John
I am writing an application where among other things I need to do CRUD operations with certain objects. I need to be able to serve both HTML pages for human users, and JSON for other applications. Right now my URLs look like this for "Read":
我正在编写一个应用程序，其中我需要对某些对象进行 CRUD 操作。我需要能够为人类用户提供 HTML 页面，并为其他应用程序提供 JSON。现在，我的“阅读”网址如下所示：
GET /foo/{id} -> Serves HTML
GET /rest/foo/{id} -> Serves JSON
etc.
This seems a little redundant. I would rather have something like this:
这似乎有点多余。我宁愿有这样的事情：
GET /foo/{id}.html OR /foo/{id} -> Serves HTML
GET /foo/{id}.json -> Serves JSON
Can Spring Boot do this? If so, how?
Spring Boot 可以做到这一点吗？如果是这样，如何？
I know how to return JSON:
我知道如何返回 JSON：
@RequestMapping(value = "/foo/{id}", method = RequestMethod.GET, produces = "application/json")
public Object fetch(@PathVariable Long id) {
return ...;
}
I also know how to return HTML:
我也知道如何返回 HTML：
@RequestMapping("/app/{page}.html")
String index(@PathVariable String page) {
if(page == null || page.equals(""))
page = "index";
return page;
}
But I'm not sure how to have a controller do one or the other based on the request.
但我不确定如何让控制器根据请求做一个或另一个。
回答by Maciej Walkowiak
It's a default behavior for Spring Boot. The only thing is that you have to mark one of @RequestMappingto produce JSON. Example:
这是 Spring Boot 的默认行为。唯一的问题是您必须标记其中之一@RequestMapping才能生成 JSON。例子：
@Controller
class HelloController {
// call http://<host>/hello.json
@RequestMapping(value = "/hello", method = RequestMethod.GET, produces = "application/json")
@ResponseBody
public MyObject helloRest() {
return new MyObject("hello world");
}
// call http://<host>/hello.html or just http://<host>/hello
@RequestMapping(value = "/hello", method = RequestMethod.GET)
public String helloHtml(Model model) {
model.addAttribute("myObject", new MyObject("helloWorld"));
return "myView";
}
}
Read more at: http://spring.io/blog/2013/05/11/content-negotiation-using-spring-mvcand http://spring.io/blog/2013/06/03/content-negotiation-using-views
阅读更多信息：http: //spring.io/blog/2013/05/11/content-negotiation-using-spring-mvc和http://spring.io/blog/2013/06/03/content-negotiation-使用视图
回答by Ivan Ursul
Actually, you are mixing rest web service with html pages, it's a bad practice. If you want to build something really great, here is my advice. Write only CRUD operations in your controllers and all html/css/js keep in some static folder and when you will want to see ui part - just call that static index.html file You can read more about that here - http://spring.io/blog/2013/12/19/serving-static-web-content-with-spring-boot
实际上，您正在将休息 Web 服务与 html 页面混合在一起，这是一种不好的做法。如果你想建立一些真正伟大的东西，这是我的建议。在您的控制器中只编写 CRUD 操作，所有 html/css/js 都保存在某个静态文件夹中，当您想要查看 ui 部分时 - 只需调用该静态 index.html 文件您可以在此处阅读更多相关信息 - http://spring .io/blog/2013/12/19/serving-static-web-content-with-spring-boot
But if you really want to do things as it is now, here is the solution:
但如果你真的想按照现在的方式做事，这里是解决方案：
@RequestMapping(value = "/foo/{id}", method = RequestMethod.GET)
public Object serve(final HttpServletRequest req, final HttpServletResponse resp, @PathVariable final Long id) {
String header = req.getHeader("Accept");
// If Accept header will be text/html - then we are forwarding to jsp page.
if(header.equals("text/html")) {
req.getRequestDispatcher("login.jsp").forward(req, resp);
}
// In other cases we are returning json and setting appropriate headers.
resp.setHeader("Content-Type", "application/json");
Object object = "Some string";
return object;
}
