Java ResponseEntity<T> 和@ResponseBody 有什么区别？
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What is the difference between ResponseEntity<T> and @ResponseBody?
提问by Flavio
I have a simple handler in my controller which returns a message
我的控制器中有一个简单的处理程序，它返回一条消息
@RequestMapping(value = "/message")
@ResponseBody
public Message get() {
return new Message(penguinCounter.incrementAndGet() + " penguin!");
}
At the same time I can use something like this
同时我可以使用这样的东西
@RequestMapping(value = "/message")
ResponseEntity<Message> get() {
Message message = new Message(penguinCounter.incrementAndGet() + " penguin!");
return new ResponseEntity<Message>(message, HttpStatus.OK);
}
What is the difference betweet this two approaches? Let's not take into account HttpStatus :)
这两种方法有什么区别？我们不考虑 HttpStatus :)
采纳答案by cliff.meyers
ResponseEntity will give you some added flexibility in defining arbitrary HTTP response headers. See the 4th constructor here:
ResponseEntity 将在定义任意 HTTP 响应标头时为您提供一些额外的灵活性。在此处查看第 4 个构造函数：
http://docs.spring.io/spring/docs/3.0.x/api/org/springframework/http/ResponseEntity.html
http://docs.spring.io/spring/docs/3.0.x/api/org/springframework/http/ResponseEntity.html
ResponseEntity(T body, MultiValueMap<String,String> headers, HttpStatus statusCode)
A List of possible HTTP response headers is available here:
此处提供了可能的 HTTP 响应标头列表：
http://en.wikipedia.org/wiki/List_of_HTTP_header_fields#Responses
http://en.wikipedia.org/wiki/List_of_HTTP_header_fields#Responses
Some commonly-used ones are Status, Content-Type and Cache-Control.
一些常用的是状态、内容类型和缓存控制。
If you don't need that, using @ResponseBody will be a tiny bit more concise.
如果您不需要它，使用 @ResponseBody 会更简洁一点。
回答by Ziaullhaq Savanur
HttpEntityrepresents an HTTP requestor responseconsists of headersand body.
HttpEntity表示由headers和body组成的 HTTP请求或响应。
// Only talks about body & headers, but doesn't talk about status code
public HttpEntity(T body, MultiValueMap<String,String> headers)
ResponseEntityextends HttpEntity but also adds a Http status code.
ResponseEntity扩展了 HttpEntity 但也添加了 Http 状态代码。
// i.e ResponseEntity = HttpEntity + StatusCode
public ResponseEntity(T body, MultiValueMap<String,String> headers, HttpStatus statusCode)
Hence used to fullyconfigurethe HTTP response.
因此用于完全配置HTTP 响应。
For Ex:
例如：
@ControllerAdvice
public class JavaWebExeptionHandler {
@Autowired
ExceptionErrorCodeMap exceptionErrorCodeMap;
@ExceptionHandler(RuntimeException.class)
public final ResponseEntity<ExceptionResponseBody> handleAllExceptions(Exception ex) {
Integer expCode = exceptionErrorCodeMap.getExpCode(ex.getClass());
// We have not added headers to response here, If you want you can add by using respective constructor
return new ResponseEntity<ExceptionResponseBody>(new ExceptionResponseBody(expCode, ex.getMessage()),
HttpStatus.valueOf(expCode));
}
}
@ResponseBodyindicates that returnvalue of methodon which it is used is bound to the response body(Mean the return value of method is treated as Http response body)
@ResponseBody表示使用它的方法的返回值绑定到响应体（意味着方法的返回值被视为Http响应体）
