@Target({ElementType.TYPE}) 
@Retention(RetentionPolicy.RUNTIME)
@Documented 
@Component public @interface Controller {
	// 用于指定存入IOC容器是Bean的唯一標(biāo)識(shí)
	@AliasFor(annotation = Component.class) 
    String value() default "";
}

@Target(ElementType.TYPE) 
@Retention(RetentionPolicy.RUNTIME) 
@Documented 
@Controller 
@ResponseBody public @interface RestController {
	// 用于指定存入ioc容器時(shí)bean的唯一標(biāo)識(shí)。 @since 4.0.1 
	@AliasFor(annotation = Controller.class) 
	String value() default "";
}

package org.springframework.web.bind.annotation;
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Mapping
public @interface RequestMapping {
    // 給當(dāng)前url 提供一個(gè)名稱(chēng)
    String name() default "";
	// value: 用于指定請(qǐng)求的URL . 和path屬性作用一樣
	// 注意: 該屬性的值 前邊加不加 "/" 都是一樣的.
    @AliasFor("path")
    String[] value() default {};
	// 4.2 版本中加入的注解 和value屬性一樣
    // @since 4.2
    @AliasFor("value")
    String[] path() default {};
	// method：用于指定請(qǐng)求的方式。它支持以下這些類(lèi)型: 
    // GET, POST, HEAD, OPTIONS, PUT, PATCH, DELETE, TRACE.
    // 是通過(guò)RequestMethod枚舉指定的
    RequestMethod[] method() default {};
    // params：用于指定限制請(qǐng)求參數(shù)的條件。它支持簡(jiǎn)單的表達(dá)式。
    // 要求請(qǐng)求參數(shù)的key和value必須和配置的一模一樣。
    // 示例: params = {"accountName"}，表示請(qǐng)求參數(shù)必須有accountName
	//      params = {"moeny!100"}，表示請(qǐng)求參數(shù)中money不能是100。
    String[] params() default {};
	// headers：用于指定限制請(qǐng)求消息頭的條件。
    // 示例: RequestMapping(value = "/something", headers = "content-type=text/*")
    String[] headers() default {};
	// consumes：用于指定可以接收的請(qǐng)求正文類(lèi)型（MIME類(lèi)型）
    // 示例: consumes = "text/plain"  , consumes = {"text/plain", "application/*"}
    String[] consumes() default {};
	// produces：用于指定可以生成的響應(yīng)正文類(lèi)型。（MIME類(lèi)型）
    // produces = "text/plain"
    // produces = {"text/plain", "application/*"}
    // produces = MediaType.APPLICATION_JSON_UTF8_VALUE
    String[] produces() default {};
}

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@RequestMapping(
    method = {RequestMethod.POST}
)
public @interface PostMapping {

@Controller
public class ModelAttributeController {
    @ModelAttribute("username")
    public String showModel(String username){
        System.out.println("showModel method name is "+username);
        username = username + "aaa";
        return username;
    }
    @RequestMapping("/useModelAttribute")
    public String useModelAttribute(@ModelAttribute("username") String username){
        System.out.println("controller method name is "+username);
        return "success";
    }
}

package com.exception;
/**
 * 自定義異常（處理業(yè)務(wù)異常）
 */
public class CustomerException extends Exception{
    private String message;
    public CustomerException(String message){
        this.message = message;
    }
    @Override
    public String getMessage() {
        return message;
    }
}

@ControllerAdvice
public class ExceptionHandlerAdvice {
    @ExceptionHandler(Exception.class)
    public String handleException(Model model, Exception e){
        String errorMsg = "";
        //判斷Exception的類(lèi)型是不是CustomerException
        if(e instanceof CustomerException){
            errorMsg = e.getMessage();
        }else {
            //系統(tǒng)異常
            errorMsg = "服務(wù)器內(nèi)部錯(cuò)誤，請(qǐng)聯(lián)系管理員！";
        }
        model.addAttribute("errorMsg",errorMsg);
        return "error";
    }
}

package com.web.controller;
@ControllerAdvice
public class ExceptionHandlerAdvice {
    @ExceptionHandler(Exception.class)
    public String handleException(Model model, Exception e){
        String errorMsg = "";
        //判斷Exception的類(lèi)型是不是CustomerException
        if(e instanceof CustomerException){
            errorMsg = e.getMessage();
        }else {
            //系統(tǒng)異常
            errorMsg = "服務(wù)器內(nèi)部錯(cuò)誤，請(qǐng)聯(lián)系管理員！";
        }
        model.addAttribute("errorMsg",errorMsg);
        return "error";
    }
}

<%-- ExceptionHandler注解的使用--%>
<a href="useExceptionHandler?age=111" rel="external nofollow" >ExcpetionHandler注解的使用</a>
<hr/>

 @RequestMapping("/useRequestParam")
 public String useRequestParam(@RequestParam(value = "page",defaultValue = "10") int page){
     System.out.println("當(dāng)前頁(yè)是："+page);
     return "success";
 }

@RequestMapping("/useRequestBody")
public String useRequestBody(@RequestBody(required = false) User user){
    //System.out.println("不支持跨域 user is "+user);
    System.out.println(" user is "+user);
    return "success";
}

    
    <a href="#" rel="external nofollow"  id="useRequestBodyAjax">RequestBody注解的使用</a>
    <%-- RequestBody注解的使用--%>
    <script src="js/jquery-2.2.3.min.js"></script>
<%--    <script src="${pageContext.request.contextPath}/js/jquery-2.2.3.min.js"></script>--%>
    <script type="text/javascript">
        //頁(yè)面加載事件
        $(function () {
            //給Id為useRequestBodyAjax超鏈接綁定一個(gè)點(diǎn)擊事件
            $("#useRequestBodyAjax").click(function () {
                alert("點(diǎn)擊事件綁定成功");
                $.ajax({
                    url: "useRequestBody",
                    type: "post",
                    // data:"username=test&age=18&gender=male",
                    data: '{"username":"test","age":25,"gender":"male"}',//json
                    contentType: "application/json",
                    dataType: "text",
                    success: function (data) {
                        alert(data);
                    }
                });
            });
        })
    </script>

    @RequestMapping("/useRequestHeader")
    public String useRequestHeader
        (@RequestHeader(value = "Accept-Language",required = false,defaultValue = "test") String header)
    {
        System.out.println("Accept-Language:"+header);
        return "success";
    }

@CookieValue(value = "JSESSIONID" , required = true,  defaultValue = "")

    @RequestMapping("/useCookieValue")
    public String useCookieValue(@CookieValue("JSESSIONID") String jsessionid){
        System.out.println(jsessionid);
        return "success";
    }

@RequestMapping(method = RequestMethod.PUT,value = "/{id}")
public String update(@PathVariable Integer id, User user){
        //1.給user的id賦值
        user.setId(id);
        //2.輸出
        System.out.println("user is "+user);
        return "success";
 }

package com.web.controller;
/**
 * SessionAttribute和SessionAttributes注解的使用
 */
@Controller
@SessionAttributes(value = {"message"})
public class SessionAttributesController {
    /**
     * 往session域中存入數(shù)據(jù)
     * 在沒(méi)有SessionAttributes注解時(shí)，當(dāng)控制器方法的參數(shù)有Model,ModelMap時(shí)是默認(rèn)往請(qǐng)求域中存入數(shù)據(jù)
     * @return
     */
    @RequestMapping("/useSessionAttributes")
    public String useSessionAttributes(Model model){
        model.addAttribute("message","存入請(qǐng)求域的數(shù)據(jù)");
        return "success";
    }
    @RequestMapping("/useSessionAttribute")
    public String useSessionAttribute(HttpServletRequest request,@SessionAttribute(value = "message",required = false) String message){
        System.out.println(message);
        System.out.println("request attribute "+request.getAttribute("message"));
        return "success";
    }
}

@RequestMapping("/useResponseBody")
public String useResponseBody(){
        return "use response body";
}

package com.filters;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class CrossOriginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        try{
            HttpServletRequest request = (HttpServletRequest) req;
            HttpServletResponse response = (HttpServletResponse)res;
            System.out.println("解決跨域問(wèn)題的過(guò)濾器執(zhí)行了");
            //設(shè)置response的響應(yīng)消息頭實(shí)現(xiàn)跨域問(wèn)題的解決
            /* 允許跨域的主機(jī)地址 */
            response.setHeader("Access-Control-Allow-Origin", "*");
            /* 允許跨域的請(qǐng)求方法GET, POST, HEAD 等 */
            response.setHeader("Access-Control-Allow-Methods", "*");
            /* 重新預(yù)檢驗(yàn)跨域的緩存時(shí)間 (s) */
            response.setHeader("Access-Control-Max-Age", "3600");
            /* 允許跨域的請(qǐng)求頭 */
            response.setHeader("Access-Control-Allow-Headers", "*");
            /* 是否攜帶cookie */
            response.setHeader("Access-Control-Allow-Credentials", "true");
            //放行
            chain.doFilter(request,response);
        }catch (Exception e){
            e.printStackTrace();
        }
    }
    @Override
    public void destroy() {  }
}

    /**
     * 跨域訪問(wèn)的方法
     * @param user
     * @return
     */
    @RequestMapping("/useCrossOrigin")
    @ResponseBody
    @CrossOrigin
    public String useCrossOrigin(@RequestBody(required = false) User user){
        System.out.println("user is "+user);
        return "success";
    }