JSR303和拦截器
目录
- 一、 JSR303
-
- 1.1.简介
- 1.2.pom依赖
- 1.3.后端
- 二、拦截器
-
- 2.1 入门
- 2.2 拦截器链
- 2.3 登录权限控制
一、 JSR303
1.1.简介
服务端验证
1.2.pom依赖
org.hibernate
hibernate-validator
6.0.7.Final
1.3.后端
代码展示
package com.yzp.model;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
/**
* @NotNull:针对的是基本数据类型
* @NotEmpty:作用于集合
* @NotBlank：作用于字符串
*/
public class Clayy {
@NotNull(message = ("cid不能为空"))
protected Integer cid;
@NotBlank(message = ("班级名称不能为空"))
protected String cname;
@NotBlank(message = ("教员老师不能为空"))
protected String cteacher;
protected String pic;
public Clayy(Integer cid, String cname, String cteacher, String pic) {
this.cid = cid;
this.cname = cname;
this.cteacher = cteacher;
this.pic = pic;
}
public Clayy() {
super();
}
public Integer getCid() {
return cid;
}
public void setCid(Integer cid) {
this.cid = cid;
}
public String getCname() {
return cname;
}
public void setCname(String cname) {
this.cname = cname;
}
public String getCteacher() {
return cteacher;
}
public void setCteacher(String cteacher) {
this.cteacher = cteacher;
}
public String getPic() {
return pic;
}
public void setPic(String pic) {
this.pic = pic;
}
@Override
public String toString() {
return "Clayy{" +
"cid=" + cid +
", cname='" + cname + '\'' +
", cteacher='" + cteacher + '\'' +
", pic='" + pic + '\'' +
'}';
}
}
控制层代码controller
/**
* @valid 是与实体类中的服务端校验 注解配合使用的
* @param clayy
* @param bindingResult 存放了所有违背 校验的错误信息
* @return
*/
@RequestMapping("/valiAdd")
public String valiAdd(@Valid Clayy clayy, BindingResult bindingResult,HttpServletRequest request){
if(bindingResult.hasErrors()){
Map msg = new HashMap();
// 违背规则
List fieldErrors = bindingResult.getFieldErrors();
for (FieldError fieldError : fieldErrors) {
//cid ：cid不能为空
System.out.println(fieldError.getField() + ":" + fieldError.getDefaultMessage());
msg.put(fieldError.getField(),fieldError.getDefaultMessage());
}
request.setAttribute("msg",msg);
//如果出现了错误，应该将提示语显示在表单提示元素后方
return "clyedit";
}else {
this.clayyBiz.insertSelective(clayy);
}
return "redirect:/cly/list";
}
jsp代码
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
班级的编辑界面
运行结果：
二、拦截器
2.1 入门
package com.yzp.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
/**
* @author易泽鹏
* @site 16670388677
* @company
* @create 2022-08-22 18:08
*/
@Controller
public class HelloController {
@RequestMapping("/hello")
public String hello(){
System.out.println("进入业务方法");
return "index";
}
}
后台代码
public class OneInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("【OneInterceptor】：preHandle...");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("【OneInterceptor】：postHandle...");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("【OneInterceptor】：afterCompletion...");
}
}
配置到springmvc.xml里面
index代码
<%--
Created by IntelliJ IDEA.
User: Administrator
Date: 2022/8/22
Time: 20:16
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
测试json数据返回
返回list<T>对象
返回list<map>对象
返回T对象
返回map对象
返回hunhe对象
http://localhost:8080/hello
运行结果：
2.2 拦截器链
拦截器OneInterceptor
public class OneInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("【OneInterceptor】：preHandle...");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("【OneInterceptor】：postHandle...");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("【OneInterceptor】：afterCompletion...");
}
}
拦截器TwoInterceptor
public class TwoInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
System.out.println("【TwoInterceptor】：preHandle...");
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
System.out.println("【TwoInterceptor】：postHandle...");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
System.out.println("【TwoInterceptor】：afterCompletion...");
}
}
配置文件SpringMVC.xml
注：如果preHandle的返回值为false，则后续代码不执行
运行结果
2.3 登录权限控制
拦截器
package com.yzp.intercept;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* @author易泽鹏
* @site 16670388677
* @company
* @create 2022-08-22 17:57
*/
public class OneHandlerInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//预处理
System.out.println("OneHandlerInterceptor.preHandle");
//如果 login、logout 这个两个请求就直接放行，反之就拦截
String url = request.getRequestURL().toString();
if(url.indexOf("/login")>0||url.indexOf("/logout")>0){
return true;
}
//对于请求业务方法 只有登录果，也就是存在session，才能访问
String uname = (String)request.getSession().getAttribute("uname");
System.out.println(uname);
if(uname==null||"".equals(uname)){
response.sendRedirect("/login.jsp");
return false;
}
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
//后处理
System.out.println("OneHandlerInterceptor.postHandle");
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
//完成后执行
System.out.println("OneHandlerInterceptor.afterCompletion");
}
}
controller代码
package com.yzp.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;
/**
* @author易泽鹏
* @site 16670388677
* @company
* @create 2022-08-22 18:37
*/
@Controller
public class LoginController {
@RequestMapping("/login")
public String login(HttpServletRequest request){
//登录成功 需要 保存用户信息
String uname = request.getParameter("uname");
if("yzp".equals(uname)){
request.getSession().setAttribute("uname",uname);
System.out.println(uname);
}
return "index";
}
@RequestMapping("/logout")
public String logout(HttpServletRequest request){
request.getSession().invalidate();
return "index";
}
}
测试步骤如下：
http://localhost:8082/cly/list 不能访问，因为session被过滤掉
http://localhost:8082/login 不能访问，因为用户未成功登录被过滤掉
http://localhost:8082/login?uname=yzp 可以访问
http://localhost:8082/logout 清除掉session
登录成功跳到主界面
登录成功之后才可访问cly/list界面
