Spring MVC常用注解

话不多说，直接代码：

@Controller//控制器
@RequestMapping("/anno")//路径
public class DemoAnnoController {
    /**
     * 此方法未标明路径，因此使用类级别的路径/anno；produces可定制返回的response的媒体类型和字符集，或需要返回值是json对象。
     * ResponseBody支持将返回值放在response体内，而不是返回一个页面，此注解返回数据，此注解可以放置在返回值前或者方法上。
     * @param request
     * @return
     */
    @RequestMapping(produces = "text/plain;charset=UTF-8")
    public @ResponseBody String index(HttpServletRequest request){
        return "url:"+request.getRequestURI()+" can access";
    }

    /**
     * PathVariable接收路径参数
     * @param str
     * @param request
     * @return
     */
    @RequestMapping(value="/pathvar/{str}",produces = "text/plain;charset=UTF-8")
    public @ResponseBody String demoPathVar(@PathVariable String str,HttpServletRequest request){
        return "url:"+request.getRequestURI()+" can access,str: "+str;
    }
    @RequestMapping(value = "/requestParam",produces = "text/plain;charset=UTF-8")
    public @ResponseBody String passRequestParam(Long id,HttpServletRequest request){
        return "url:"+request.getRequestURI()+" can access,id: "+id;
    }
    @RequestMapping(value = "/obj",produces = "application/json;charset=UTF-8")
    @ResponseBody
    public String passObj(DemoObj obj,HttpServletRequest request){
        return "url:"+request.getRequestURI()+" can access, obj id: "+obj.getId()+" obj name:"+obj.getName();
    }

    /**
     * 可以映射不同的路径到相同的方法
     * @param request
     * @return
     */
    @RequestMapping(value = {"/name1","/name2"},produces = "text/plain;charset=UTF-8")
    public @ResponseBody String remove(HttpServletRequest request){
        return "url:"+request.getRequestURI()+" can access ";
    }
}

@RestController//使用该注解，声明是控制器，并且返回数据时不需要@ResponseBody
@RequestMapping("/rest")
public class DemoRestController {
    //返回json类型的数据
    @RequestMapping(value = "/getjson",produces = {"application/json;charset=UTF-8"})
    public DemoObj getjson(DemoObj obj){
        return new DemoObj(obj.getId()+1,obj.getName()+"yy");
    }
    //返回xml类型的数据。
    @RequestMapping(value = "/getxml",produces = {"application/xml;charset=UTF-8"})
    public DemoObj getxml(DemoObj obj){
        return new DemoObj(obj.getId()+1,obj.getName()+"yy");
    }
}