[转发]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 "u3053u3093u306bu3061u306fu4e16u754cuff01 ("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 "u3053u3093u306bu3061u306fu4e16u754cuff01 ("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);
    }

}