SPRING MVC3.2案例讲解--SPRING MVC3的@ResponseBody和ResponseEntity

在传统的开发过程中，我们的控制CONTROLL层通常需要转向一个JSP视图；但随着WEB2.0相关技术的崛起，我们很多时候只需要返回数据即可，而不是一个JSP页面。

SPRING MVC3的@ResponseBody使Controller直接返回数据，而不是直接指向具体的视图；同时通过

MessageConverter和produces（如produces="text/plain;charset=UTF-8"）可以返回各种格式的数据（XML，json，RSS，TEXT，字节流等),本章只介绍最简单的使用；

见代码：

@ResponseBody可以直接返回结果，

而ResponseEntity 可以定义返回的HttpHeaders和HttpStatus，见文章最后的两张图

@RequestMapping(value="/response", method=RequestMethod.GET)
public class ResponseController {

//http://127.0.0.1:8010/response/annotation
	@RequestMapping("/annotation")
	public @ResponseBody String responseBody() {
		return "The String ResponseBody";
	}


	@RequestMapping("/charset/accept")
	public @ResponseBody String responseAcceptHeaderCharset() {
		return "\u3053\u3093\u306b\u3061\u306f\u4e16\u754c\uff01 (\"Hello world!\" in Japanese)";
	}

//http://127.0.0.1:8010/response/charset/produce
	@RequestMapping(value="/charset/produce", produces="text/plain;charset=UTF-8")
	public @ResponseBody String responseProducesConditionCharset() {
		return "\u3053\u3093\u306b\u3061\u306f\u4e16\u754c\uff01 (\"Hello world!\" in Japanese)";
	}

//http://127.0.0.1:8010/response/entity/status
	@RequestMapping("/entity/status")
	public ResponseEntity<String> responseEntityStatusCode() {
		return new ResponseEntity<String>("The String ResponseBody with custom status code (403 Forbidden)",
				HttpStatus.FORBIDDEN);
	}

//http://127.0.0.1:8010/response/entity/headers
	@RequestMapping("/entity/headers")
	public ResponseEntity<String> responseEntityCustomHeaders() {
		HttpHeaders headers = new HttpHeaders();
		headers.setContentType(MediaType.TEXT_PLAIN);
		return new ResponseEntity<String>("The String ResponseBody with custom header Content-Type=text/plain",
				headers, HttpStatus.OK);
	}

}