spring mvc

使用maven新建项目，添加srpingmvc依赖

<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.0.1.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.0.1.RELEASE</version>
        </dependency>
    </dependencies>

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创建WEB-INF目录及web.xml文件

编辑web.xml

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
          version="3.1">
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/services.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

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创建spring配置文件services.xml

<?xml version="1.0" encoding="UTF-8"?>
<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"
       xsi:schemaLocation="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.xsd">

    <context:component-scan base-package="org.mythsky.springdemo"></context:component-scan>
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean>
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"></bean>
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"></bean>
</beans>

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编写HelloController

package org.mythsky.springdemo;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class HelloController {
    private static final Log logger= LogFactory.getLog(HelloController.class);
    @RequestMapping(value = "/hello")
    public ModelAndView hello(){
        logger.info("hello 方法被调用");
        ModelAndView mv=new ModelAndView();
        mv.addObject("message","Hello World!");
        mv.setViewName("/WEB-INF/views/welcome.jsp");
        return mv;
    }
}

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新建一个jsp页面welcome.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>欢迎</title>
</head>
<body>
    <h3>${requestScope.message}</h3>
</body>
</html>

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配置tomcat

运行tomcat，打开地址：http://localhost:8080/hello

结果

接着修改下services.xml的试图解析器配置

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

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新建一个User类

package org.mythsky.springdemo.model;

import java.io.Serializable;

public class User implements Serializable {
    private String username;
    private String sex;
    private Integer age;

    public User() {
        super();
    }

    public User(String username, String sex, Integer age) {
        this.username = username;
        this.sex = sex;
        this.age = age;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

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UserController

package org.mythsky.springdemo.controller;

import org.mythsky.springdemo.model.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class UserController {
    @RequestMapping(value = "/register",method = RequestMethod.GET)
    public String registerForm(Model model){
        User user=new User("jack","男",28);
        model.addAttribute("command",user);
        return "registerForm";
    }
}

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可以看到此时返回的是一个字符串registerForm，配合视图解析器的前缀和后缀会自动查找/WEB-INF/views/registerForm.jsp

新建registerForm.jsp

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%--
  Created by IntelliJ IDEA.
  User: mythsky
  Date: 2017/11/18
  Time: 14:58
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>注册</title>
</head>
<body>
<form:form action="register" method="post">
    <table>
        <tr>
            <td>姓名：</td>
            <td><form:input path="username"></form:input></td>
        </tr>
        <tr>
            <td>性别：</td>
            <td><form:input path="sex"></form:input></td>
        </tr>
        <tr>
            <td>年龄：</td>
            <td><form:input path="age"></form:input></td>
        </tr>
    </table>
</form:form>
</body>
</html>

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运行tomcat，打开地址：http://localhost:8080/register ，会看到User自动绑定到了页面上

这里是因为控制器里把user绑定到了command上，如果不是绑定到command上，而是换个名字，比如user，可以使用如下方式

model.addAttribute("user",user);

Idea很智能给出了提示。

查看页面源码可以看到模型的绑定

给user添加两个属性

private boolean reader;
    private List<String> courses;

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修改控制器

User user=new User("jack","男",28);
        user.setReader(true);
        List<String> list=new ArrayList<String>();
        list.add("javaee");
        list.add("spring");
        user.setCourses(list);
        model.addAttribute("user",user);

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修改页面

<tr>
            <td>年龄：</td>
            <td><form:input path="age"></form:input></td>
        </tr>
        <tr>
            <td>选择课程：</td>
            <td>
                <form:checkbox path="courses" value="javaee" label="javee"></form:checkbox>
                <form:checkbox path="courses" value="spring" label="spring"></form:checkbox>
                <form:checkbox path="courses" value="mybatis" label="mybatis"></form:checkbox>
            </td>
        </tr>
    </table>
    <form:checkbox path="reader"></form:checkbox>已经阅读相关协议

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查看结果

改用checkboxes效果也是一样的，需要修改控制器

 User user=new User("jack","男",28);
        user.setReader(true);
        List<String> list=new ArrayList<String>();
        list.add("javaee");
        list.add("spring");
        user.setCourses(list);
        List<String> courseList=new ArrayList<String>();
        courseList.add("javaee");
        courseList.add("spring");
        courseList.add("mybatis");
        model.addAttribute("user",user);
        model.addAttribute("courseList",courseList);

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页面

<tr>
            <td>选择课程：</td>
            <td>
                <form:checkboxes path="courses" items="${courseList}"></form:checkboxes>
            </td>
        </tr>

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select

新增Dept类

package org.mythsky.springdemo.model;

public class Dept {
    private Integer id;
    private String name;

    public Dept() {
    }

    public Dept(Integer id, String name) {
        this.id = id;
        this.name = name;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

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在User中添加属性

private Integer deptId;

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控制器添加方法

@RequestMapping(value = "/select",method = RequestMethod.GET)
    public String SelectForm(Model model){
        User user=new User();
        user.setDeptId(2);
        Map<Integer,String> dept=new HashMap<Integer, String>();
        dept.put(1,"财务部");
        dept.put(2,"开发部");
        dept.put(3,"销售部");
        model.addAttribute("user",user);
        model.addAttribute("dept",dept);
        return "selectForm";
    }

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添加selectForm.jsp页面

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%--
  Created by IntelliJ IDEA.
  User: mythsky
  Date: 2017/11/18
  Time: 15:52
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>select</title>
</head>
<body>
<form:form modelAttribute="user" action="register" method="post">
    <table>

        <tr>
            <td>选择部门：</td>
            <td>
                <form:select path="deptId" items="${dept}"></form:select>
            </td>
        </tr>
    </table>
</form:form>
</body>
</html>

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继续修改控制器

@RequestMapping(value = "/select",method = RequestMethod.GET)
    public String SelectForm(Model model){
        User user=new User();
        user.setDeptId(2);
        List<Dept> list=new ArrayList<Dept>();
        list.add(new Dept(1,"财务部"));
        list.add(new Dept(2,"开发部"));
        list.add(new Dept(3,"销售部"));
        model.addAttribute("user",user);
        model.addAttribute("dept",list);
        return "selectForm";
    }

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修改页面

td>
                <form:select path="deptId">
                    <form:options items="${dept}" itemLabel="name" itemValue="id"></form:options>
                </form:select>
            </td>

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效果与刚才一致。

errors

添加一个验证类

package org.mythsky.springdemo.validator;

import org.mythsky.springdemo.model.User;
import org.springframework.lang.Nullable;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;

public class UserValidator implements Validator {
    public boolean supports(Class<?> aClass) {
        return User.class.equals(aClass);
    }

    public void validate(@Nullable Object o, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors,"username",null,"用户名不能为空");
        ValidationUtils.rejectIfEmpty(errors,"sex",null,"性别不能为空");
    }
}

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控制器中添加验证

@InitBinder
    public void initBinder(DataBinder binder){
        binder.setValidator(new UserValidator());
    }
    @RequestMapping(value = "/register",method = RequestMethod.POST)
    public String register(@Validated User user,Errors errors){
        if(errors.hasFieldErrors())
            return "registerForm";
        return "submit";
    }

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页面修改

<tr>
            <td>姓名：</td>
            <td><form:input path="username"></form:input></td>
            <td><font color="red"><form:errors path="username"></form:errors></font> </td>
        </tr>
        <tr>
            <td>性别：</td>
            <td><form:input path="sex"></form:input></td>
            <td><font color="red"><form:errors path="sex"></form:errors></font> </td>
        </tr>
        <tr>
            <td>年龄：</td>
            <td><form:input path="age"></form:input></td>
        </tr>
        <tr><td><input type="submit" value="提交"></td></tr>

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查看结果

权限控制

User

package org.mythsky.security.domain;

import java.util.Date;

public class User {
    private Integer id;
    private String username;
    private String loginname;
    private String password;
    private Integer status;
    private Date createDate;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getLoginname() {
        return loginname;
    }

    public void setLoginname(String loginname) {
        this.loginname = loginname;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Integer getStatus() {
        return status;
    }

    public void setStatus(Integer status) {
        this.status = status;
    }

    public Date getCreateDate() {
        return createDate;
    }

    public void setCreateDate(Date createDate) {
        this.createDate = createDate;
    }
}

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UserService

package org.mythsky.security.service;

import org.mythsky.security.domain.User;
import org.springframework.stereotype.Service;

@Service
public class UserService {
    public User login(String loginname,String password){
        User user=new User();
        if(loginname.equals("admin")&&password.equals("admin")){
            user.setId(1);
            user.setLoginname("admin");
            user.setUsername("admin");
        }else{
            user=null;
        }
        return user;
    }
}

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HelloController

package org.mythsky.security.controllers;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class HelloController {
    private static final Log logger= LogFactory.getLog(HelloController.class);
    @RequestMapping(value = "/hello")
    public ModelAndView hello(){
        logger.info("hello 方法被调用");
        ModelAndView mv=new ModelAndView();
        mv.addObject("message","Hello World!");
        mv.setViewName("welcome");
        return mv;
    }
}

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UserController

package org.mythsky.security.controllers;

import org.mythsky.security.domain.User;
import org.mythsky.security.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpSession;

@Controller
public class UserController {
    @Autowired
    UserService userService;
    @RequestMapping("/loginForm")
    public String loginForm(){
        return "loginForm";
    }

    @RequestMapping("/login")
    public ModelAndView login(@RequestParam("loginname")String loginname,
                              @RequestParam("password")String password,
                              HttpSession session,
                              ModelAndView mv){
        User user=userService.login(loginname,password);
        if(user!=null){
            session.setAttribute("user",user);
            mv.addObject("message",user.getLoginname());
            mv.setViewName("redirect:/hello");
//            mv.setViewName("welcome");
        }else {
            mv.addObject("message","用户名或密码错误!请重新输入");
            mv.setViewName("forward:/loginForm");
        }
        return mv;
    }
}

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AuthorizedInterceptor

package org.mythsky.security.interceptor;

import org.mythsky.security.domain.User;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class AuthorizedInterceptor implements HandlerInterceptor {
    private static final String[] IGNORE_URL={"/loginForm","/login","/404.html"};
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //默认用户没有登录
        boolean flag=false;
        //获得请求的ServletPath
        String servletPath=request.getServletPath();
        //判断是否需要拦截
        for(String s:IGNORE_URL){
            if(servletPath.contains(s)){
                flag=true;
                break;
            }
        }
        //拦截请求
        if(!flag){
            //获取Session中的用户
            User user=(User)request.getSession().getAttribute("user");
            //判断用户是否已经登录
            if(user==null){
                //如果用户没有登录，跳转到登录页面
                request.setAttribute("message","请先登录再访问网站!");
                request.getRequestDispatcher("/loginForm").forward(request,response);
                return flag;
            }else {
                flag=true;
            }
        }
        return flag;
    }

    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

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web.xml

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/services.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

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services.xml

<?xml version="1.0" encoding="UTF-8"?>
<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/beans
                http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <context:component-scan base-package="org.mythsky.security"></context:component-scan>
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"></bean>
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"></bean>
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/hello"/>
            <bean class="org.mythsky.security.interceptor.AuthorizedInterceptor"></bean>
        </mvc:interceptor>
    </mvc:interceptors>
</beans>

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loginForm.jsp

<%--
  Created by IntelliJ IDEA.
  User: mythsky
  Date: 2018/8/19
  Time: 18:28
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<html>
<head>
    <title>登录</title>
</head>
<body>
    <form:form method="post" action="login">
        <table>
            <tr>
                <td>登录名:</td>
                <td><input type="text" name="loginname"></td>
            </tr>
            <tr>
                <td>密  码:</td>
                <td><input type="password" name="password"></td>
            </tr>
            <tr>
                <td><input type="submit" value="提交"> </td>
            </tr>
        </table>
    </form:form>
</body>
</html>

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welcome.jsp

<%--
  Created by IntelliJ IDEA.
  User: mythsky
  Date: 2018/8/19
  Time: 17:40
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>欢迎</title>
</head>
<body>
    <h3>${requestScope.message}</h3>
</body>
</html>

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原文地址：https://www.cnblogs.com/uptothesky/p/7856717.html