pringMVC教程6[Restful和拦截器]

/**
 * RestFul
 * @author dpb【波波烤鸭】
 *
 */
@RestController
public class UserController {
  @Autowired
  UserService userService;
  /** * 查询所有、分页查询、条件查询 * 一般都是直接使用资源的复数形式来做路径 * * @return */
  @GetMapping("/users")
  public List<User> getAllUser(@RequestParam(defaultValue = "1") Integer page,
      @RequestParam(defaultValue = "4") Integer count) {
    return userService.getAllUser(page, count);
  }
  /**
   * * 按照id查询 例如 http://localhost:8080/user/1 表示查询id为1的用户 * * @param id
   * * @return
   */
  @GetMapping("/user/{id}")
  public User getUserById(@PathVariable Integer id) {
    return userService.getUserById(id);
  }
  /** * 使用POST请求来完成添加功能 * * @param user * @return */
  @PostMapping("/user")
  public RespBean addUser(@RequestBody User user) {
    int result = userService.addUser(user);
    if (result == 1) {
      return RespBean.ok("添加成功!");
    }
    return RespBean.error("添加失败!");
  }
  @DeleteMapping("/user/{id}")
  public RespBean deleteUserById(@PathVariable Integer id) {
    int result = userService.deleteUserById(id);
    if (result == 1) {
      return RespBean.ok("删除成功!");
    }
    return RespBean.error("删除失败!");
  }
  @PutMapping("/user")
  public RespBean updateUserById(@RequestBody User user) {
    int result = userService.updateUserById(user);
    if (result == 1) {
      return RespBean.ok("修改成功!");
    }
    return RespBean.error("修改失败!");
  }
}

/**
 * 自定义拦截器
 * @author dpb【波波烤鸭】
 *
 */
public class FirstIntercepter implements HandlerInterceptor{
  /**
   * 进入Handler之前调用的方法
   * 处理：
   *    用于身份确认和授权
   *    比如确认当前请求是否登陆，如果登陆就方法，否则拦截跳回登陆界面
   * @return
   *    true 放过
   *    false 拦截
   */
  @Override
  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
      throws Exception {
    System.out.println("preHandle 执行了...");
    return true;
  }
  /**
   * 进入Handler之后，返回ModelAndView对象之前执行
   * 可以修改调整的视图
   */
  @Override
  public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
      ModelAndView modelAndView) throws Exception {
    // TODO Auto-generated method stub
    System.out.println("ModelAndView之前执行...");
    modelAndView.setViewName("/error.jsp");
    modelAndView.addObject("msg", "传递的信息...");
  }
  /**
   * 执行完成Handler之后执行此方法，
   * 应用场景：
   *    统一异常处理，统一日志处理，资源释放
   */
  @Override
  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
      throws Exception {
    System.out.println("执行完Handler到返回客户端之前执行...");
  }
}

<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
  <mvc:annotation-driven></mvc:annotation-driven>
  <context:component-scan base-package="com.dpb.*"></context:component-scan>
  <!-- 拦截器的配置 -->
  <mvc:interceptors>
    <mvc:interceptor>
      <!-- ** 表示当前目录及其子目录路径 -->
      <mvc:mapping path="/**"/>
      <bean class="com.dpb.interceptor.FirstIntercepter"></bean>
    </mvc:interceptor>
  </mvc:interceptors>
</beans>