Spring MVC拦截器的使用和数据效验

什么是拦截器:

Spring MVC中的拦截器（Interceptor）类似于Servlet中的过滤器（Filter），它主要用于拦截用户请求并作相应的处理。例如通过拦截器可以进行权限验证、记录请求信息的日志、判断用户是否登录等。在SpringMVC中通过实现HandlerInterceptor接口实现自定义拦截器类。

拦截器的执行流程

 

 

 

自定义拦截器类如下

public class MyIntercept implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("========拦截器当中的preHandle()方法========");
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("=======在HandlerAdapter之后执行，在DispatcherServlet解析视图之前执行========");
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("=======呈现之后调用=======");
    }
}

编写控制器

Controller
@RequestMapping("/my")
public class MyController {
    @RequestMapping("doFirst")
    public String doFirst(){
        System.out.println("======控制器的执行方法=======");
        return "index";
    }

拦截器的配置

输出

  <!--配置拦截器-->
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/my/**"/>
            <bean class="com.springmvc.Interceptor.MyIntercept"/>
        </mvc:interceptor>
    </mvc:interceptors>

输出

 

 

Spring MVC的数据校验

架包

<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-validator</artifactId>
      <version>5.4.1.Final</version>
    </dependency>

jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
      <form action="/my/validate" method="post"/>
             编号：<input type="text" name="user_id"/>  <br/>
             姓名：<input type="text" name="user_name"/>  <br/>
             邮箱：<input type="text" name="user_email"/> <br/>
           手机号：<input type="text" name="user_phone"/>  <br/>
             地址：<input type="text" name="user_address"/>  <br/>
          身份证号：<input type="text" name="user_cardCode"/>  <br/>
                   <input type="submit" value="提交"/>
</form>
</body>

实体类

public class UserInfo {
    @NotNull(message = "编号不能为空")
    private Integer user_id;

    @NotNull
    @Length(min = 2,max = 8,message = "用户名不能少于2位大于8位")
    private String user_name;

    @Email(message = "邮箱格式不正确")
    private String user_email;

    @Pattern(regexp = "",message = "手机号格式不正确")
    private String user_phone;

    private String user_address;

    @Pattern(regexp = "",message = "身份证号不正确")
    private String user_cardCode;

    public Integer getUser_id() {
        return user_id;
    }

    public void setUser_id(Integer user_id) {
        this.user_id = user_id;
    }

    public String getUser_name() {
        return user_name;
    }

    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }

    public String getUser_email() {
        return user_email;
    }

    public void setUser_email(String user_email) {
        this.user_email = user_email;
    }

    public String getUser_phone() {
        return user_phone;
    }

    public void setUser_phone(String user_phone) {
        this.user_phone = user_phone;
    }

    public String getUser_address() {
        return user_address;
    }

    public void setUser_address(String user_address) {
        this.user_address = user_address;
    }

    public String getUser_cardCode() {
        return user_cardCode;
    }

    public void setUser_cardCode(String user_cardCode) {
        this.user_cardCode = user_cardCode;
    }
}

编写控制器

  @RequestMapping("/validate")
    public String validate(@Valid UserInfo info, BindingResult bindingResult){
        if (bindingResult.hasErrors()){
            List<ObjectError> errors=bindingResult.getAllErrors();
            for (ObjectError error:errors){
                System.out.println(error.getDefaultMessage());
            }
        }
        System.out.println(info.getUser_email());
        return "index";
    }

 

 

 

posted @ 2019-11-12 16:24  听风忆雪  阅读(379)  评论(0)  编辑  收藏  举报