SpringMVC学习（一）

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SpringMVC入门

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package com.xiaoguan.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class HelloController {
    @RequestMapping("/")
    public String index(){
        return "index";
    }
    @RequestMapping("/target")
    public String toTarget(){
        return "target";
    }
}

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<?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 https://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="com.xiaoguan.controller"/>
    <bean id="viewResolver" class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
        <property name="order" value="1"/>
        <property name="characterEncoding" value="UTF-8"/>
        <property name="templateEngine">
            <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
                <property name="templateResolver">
                    <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">

                        <!-- 视图前缀 -->
                        <property name="prefix" value="/WEB-INF/templates/"/>

                        <!-- 视图后缀 -->
                        <property name="suffix" value=".html"/>
                        <property name="templateMode" value="HTML5"/>
                        <property name="characterEncoding" value="UTF-8" />
                    </bean>
                </property>
            </bean>
        </property>
    </bean>
</beans>
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<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
    <head>
        <meta charset="UTF-8">
        <title>首页</title>
    </head>
    <body>
     <h1>首页</h1><br>
     <a th:href="@{/target}">访问目标页面target.html</a>
    </body>
</html>
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<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>$Title$</title>
</head>
<body>
HelloWorld
</body>
</html>
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<?xml version="1.0" encoding="UTF-8"?>
<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_4_0.xsd"
         version="4.0">
        <!--配置SpringMVC的前端控制器 ，对浏览器发送的请求统一处理   -->
        <!--这种方式配置文件必须放在web-info目录下    -->
<!--        <servlet>-->
<!--            <servlet-name>SpringMVC</servlet-name>-->
<!--            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>-->
<!--        </servlet>-->
<!--        <servlet-mapping>-->
<!--            <servlet-name>SpringMVC</servlet-name>-->
<!--            <url-pattern>/</url-pattern>-->
<!--        </servlet-mapping>-->
    <servlet>
        <servlet-name>SpringMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--配置springmvc.xml文件的位置和名称        -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springMVC.xml</param-value>
        </init-param>
<!--        将前端dispacheServleet的初始化时间提前到服务器启动时-->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>SpringMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>


</web-app>

Demo2

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package com.xiaoguan.bean;

import org.springframework.web.bind.annotation.RequestParam;

import java.util.Objects;

public class User {
    private Integer id;
    private String username;
    private String password;
    private Integer age;
    private String sex;
    private String email;

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", age=" + age +
                ", sex='" + sex + '\'' +
                ", email='" + email + '\'' +
                '}';
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        User user = (User) o;
        return Objects.equals(getId(), user.getId()) && Objects.equals(getUsername(), user.getUsername()) && Objects.equals(getPassword(), user.getPassword()) && Objects.equals(getAge(), user.getAge()) && Objects.equals(getSex(), user.getSex()) && Objects.equals(getEmail(), user.getEmail());
    }

    @Override
    public int hashCode() {
        return Objects.hash(getId(), getUsername(), getPassword(), getAge(), getSex(), getEmail());
    }

    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 getPassword() {
        return password;
    }

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

    public Integer getAge() {
        return age;
    }

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

    public String getSex() {
        return sex;
    }

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

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public User() {
    }

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

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package com.xiaoguan.controller;

import com.xiaoguan.bean.User;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.Arrays;

@Controller
public class ParamController {
    @RequestMapping("/testServletAPI")
    //形参位置的request表示当前请求
    public String testServlet(HttpServletRequest request){
        HttpSession session = request.getSession();
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        System.out.println("username:"+username+"password:"+password);
        return "success";
    }

    @RequestMapping("/testParam")
    public String testParam(@RequestParam(value = "user_name") String username , Integer password, String[] hobby
            , @RequestHeader("Host") String host
            , @CookieValue("Pycharm-537dcaea") String pycharm){
        System.out.println("username:"+username+",password:"+password+",hobby:"+ Arrays.toString(hobby));
        System.out.println("Host:"+host);
        System.out.println("Pycharm:"+pycharm);
        return "success";
    }
    @RequestMapping("/testpojo")
    public String testBean(User user){
        System.out.println(user);
        return "success";
    }
}

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package com.xiaoguan.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class RequestMappingController {
    @RequestMapping(value = {"/testRequest","/test" },method = {RequestMethod.POST,RequestMethod.GET})
    public String success(){
        return "success";
    }
    @GetMapping("/testGetMapping")
    public String testGetMapping(){
        return "success";
    }
    @RequestMapping(value = "/testput",method = RequestMethod.GET)
    public String testput(){
        return "success";
    }
    @RequestMapping(value = "/testParamsAndHeaders",params = {"username","password=root"},headers = {"Host=localhost:8080"})
    public String testParamsAndHeaders(){
        return "success";
    }
    //?一个任意非特殊字符，*0个或者多个字符，**中间任意一层路径或多层路径，必须单独写在两个斜线/                  之间
    @RequestMapping("/a?a/testAnt")
    public String testAnt(){
        return "success";
    }
    @RequestMapping("/testPath/{id}/{username}")
    public String testPath(@PathVariable("id") Integer id,@PathVariable("username") String username){
        System.out.println(id);
        System.out.println(username);
        return "success";
    }
}

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package com.xiaoguan.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class TestController {
    @RequestMapping("/")
    public String toIndex(){
        return "index";
    }
    @RequestMapping("/param")
    public String param(){
        return "test_param";
    }

}

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<?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 https://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="com.xiaoguan.controller"/>
<!--    配置视图解析器-->
    <bean id="viewResolver" class="org.thymeleaf.spring5.view.ThymeleafViewResolver">
        <property name="order" value="1"/>
        <property name="characterEncoding" value="UTF-8"/>
        <property name="templateEngine">
            <bean class="org.thymeleaf.spring5.SpringTemplateEngine">
                <property name="templateResolver">
                    <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">

                        <!-- 视图前缀 -->
                        <property name="prefix" value="/WEB-INF/templates/"/>

                        <!-- 视图后缀 -->
                        <property name="suffix" value=".html"/>
                        <property name="templateMode" value="HTML5"/>
                        <property name="characterEncoding" value="UTF-8" />
                    </bean>
                </property>
            </bean>
        </property>
    </bean>
</beans>
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<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org" xmlns:a="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="UTF-8">
    <title>首页</title>
</head>
<body>
<h1>首页</h1>
<a th:href="@{/testRequest}">测试RequestMapping注解的位置指向testRequest</a><br>
<a th:href="@{/test}">测试RequestMapping注解的位置指向test</a><br>
<a th:href="@{/testGetMapping}">测试GetMapping注解的位置指向test</a><br>
<form th:action="@{/test}" method="post">
    <input type="submit" value="测试RequestMapping的Method属性">
</form>
<form th:action="@{/testput}" method="put">
    <input type="submit" value="测试form表单是否能发送put或者delete请求">
</form>
<a th:href="@{/testParamsAndHeaders(username='admin',password='root')}">测试RequestMapping的Parames属性</a><br>
<a th:href="@{/a1a/testAnt}">测试@RequestMapping可以匹配ant风格的路径</a><br>
<a th:href="@{/aca/testAnt}">测试@RequestMapping可以匹配ant风格的路径</a><br>
<a th:href="@{/testPath/1}">测试@RequestMapping支持路径中的占位符</a><br>
<a th:href="@{/param}">测试param</a><br>
</body>
</html>
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<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>$Title$</title>
</head>
<body>
success
</body>
</html>
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<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>测试请求参数</title>
</head>
<body>
<h1>测试请求参数</h1>
<a th:href="@{/testServletAPI(username='admin',password=123456)}">测试使用servletAPI来获取请求参数</a><br>
<a th:href="@{/testParam(username='admin',password=123456)}">测试使用控制器形参来获取请求参数</a><br>
<form th:action="@{/testParam}" method="get">
    用户名：<input type="text" name="user_name"><br>
    密码：<input type="password" name="password"><br>
    爱好：<input type="checkbox" name="hobby" value="a">
    <input type="checkbox" name="hobby" value="b">
    <input type="checkbox" name="hobby" value="c"><br>
    <input type="submit" value="测试使用控制器的形参来获取参数">
</form>
<form th:action="@{/testpojo}" method="post">
    用户名：<input type="text" name="username"><br>
    密码：<input type="password" name="password"><br>
    性别：<input type="radio" name="sex" value="男">男<input type="radio" name="sex" value="女">女<br>
    年龄：<input type="text" name="age"><br>
    邮箱：<input type="text" name="email"><br>
    <input type="submit" value="使用pojo类来接收请求参数">
</form>
</body>
</html>
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<?xml version="1.0" encoding="UTF-8"?>
<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_4_0.xsd"
         version="4.0">
<!--    注册前端控制器DispatcheServlet-->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
<!--            请求编码-->
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
<!--        设置响应编码和请求编码一致为UTF_8（自己设置的）-->
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springMVC.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

JSP

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package com.xiaoguan.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class JspController {
    @RequestMapping("/success")
    public String success(){
        return "success";
    }
}

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<?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 https://www.springframework.org/schema/context/spring-context.xsd">
    <context:component-scan base-package="com.xiaoguan"/>
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/xiaoguan/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>
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<%--
  Created by IntelliJ IDEA.
  User: xiaoguan
  Date: 2023/7/29
  Time: 20:41
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>成功</title>
</head>
<body>
success
</body>
</html>

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<?xml version="1.0" encoding="UTF-8"?>
<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_4_0.xsd"
         version="4.0">
    <!--    配置编码过滤器-->
    <filter>
        <filter-name>CharacterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceResponseEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!--    配置springMVC的前端控制器-->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springMVC.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>
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<%--
  Created by IntelliJ IDEA.
  User: xiaoguan
  Date: 2023/7/29
  Time: 20:38
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h1>首页</h1>
<a href="${pageContext.request.contextPath}/success">成功页面</a>
</body>
</html>