spring学习（一）—— spring mvc

// 以下是注解接口
Target(value={ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface MaskFormat {
	String value();
}

// 以下是使用注解
@MaskFormat("(###) ###-####")
private String masked;

@Controller
@RequestMapping("/data")
public class RequestDataController {

	@RequestMapping(value="param", method=RequestMethod.GET)
	public @ResponseBody String withParam(@RequestParam String foo) {  // 对应url  /data/param?foo=bar
		return "Obtained ‘foo‘ query parameter value ‘" + foo + "‘";
	}

	@RequestMapping(value="path/{var}", method=RequestMethod.GET)
	public @ResponseBody String withPathVariable(@PathVariable String var) { // 对应url /data/path/bar
		return "Obtained ‘var‘ path variable value ‘" + var + "‘";
	}
}

@Controller
public class MappingController {
        @RequestMapping("/mapping/path")   
	public @ResponseBody String byPath() { // 最常见的
		return "Mapped by path!";
	}
	@RequestMapping(value="/mapping/path/*", method=RequestMethod.GET)
	public @ResponseBody String byPathPattern(HttpServletRequest request) { // 模式匹配到一组 url
		return "Mapped by path pattern (‘" + request.getRequestURI() + "‘)";
	}
}
    

@XmlRootElement
public class JavaBean {
        @NotNull
        private String fruit;

        @NotEmpty // 非空
	private String name;
	
	@Min(21) // 限定取值范围
	private int age;

        @DateTimeFormat(iso=ISO.DATE)
	@Past  // 必须是过去的时间，相反的是 Future
	private Date birthDate;
        
        @MaskFormat("(###) ###-####") //  自定义的格式
	private String phone;

        @NumberFormat(style=Style.PERCENT)
	private BigDecimal percent;        

        public JavaBean() {  // 构造方法1
	}

	public JavaBean(String foo) { // 构造方法2
		this.foo = foo;
	}

	@Override
	public String toString() { // java bean作为最基础的对象类，一般会重构toString方法
		return "JavaBean {foo=[" + foo + "], fruit=[" + fruit + "]}";
	}
}

// 一些场景下（如调用接口）可通过序列化的对象 根据java bean定义反转义回来
String json = MapUtils.getString(params,"json");
JavaBean aBean = JsonUtil.toObject(json, JavaBean.class);