spring mvc md5 签名验证 springmvc登录验证

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mob64ca1408d5ff 2024-03-21 10:22:28

文章标签 spring xml maven 文章分类 架构后端开发

Spring+SpringMVC+JDBC实现登录

有一位程序员去相亲的时候，非常礼貌得说自己是一名程序员，并解释自己是做底层架构的，于是女方听到"底层"两个字，就一脸嫌弃：什么时候能够到中高级？

用久了框架，把原生都忘记了，本章从零开始，熟悉一遍JDBC实现增删改查

开发环境

jdk 1.8
Maven 3.6
Spring、SpringMVC 4.3.18
dbcp2
jsp
Idea

创建项目

创建项目时，我们选择传统的Maven项目结构

创建项目时不要选择任何模板，直接点Next

spring mvc md5 签名验证 springmvc登录验证_spring

填写包名及项目名Next --> Finish

spring mvc md5 签名验证 springmvc登录验证_maven_02

在main文件夹下创建webapp --> WEB-INF --> web.xml (如下图)

spring mvc md5 签名验证 springmvc登录验证_spring_03

web.xml内容如下

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee 
         http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         id="WebApp_ID" version="3.1">
    
    <display-name>Demo-JDBC</display-name>

    <!-- 欢迎页 -->
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

引入jar包，添加Spring、SpringMVC配置

在pom.xml中添加需要用到的jar包

spring mvc md5 签名验证 springmvc登录验证_maven_04

spring mvc md5 签名验证 springmvc登录验证_xml_05

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
         http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <groupId>com.wayne</groupId>
    <artifactId>Demo-JDBC</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <!-- 统一控制jar包版本 -->
    <properties>
        <servlet-version>3.1.0</servlet-version>
        <mysql-version>5.1.38</mysql-version>
        <commons-dbcp2-version>2.1.1</commons-dbcp2-version>
        <dbutil-version>1.6</dbutil-version>
        <spring-version>4.3.18.RELEASE</spring-version>
        <jstl-version>1.2</jstl-version>
    </properties>

    <!-- jar包依赖 -->
    <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>${servlet-version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql-version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-dbcp2</artifactId>
            <version>${commons-dbcp2-version}</version>
        </dependency>
        <dependency>
            <groupId>commons-dbutils</groupId>
            <artifactId>commons-dbutils</artifactId>
            <version>${dbutil-version}</version>
        </dependency>

        <!-- spring-mvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring-version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring-version}</version>
        </dependency>

        <!-- spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring-version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring-version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring-version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring-version}</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>${jstl-version}</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>Demo-JDBC</finalName>
        <plugins>
            <!-- Tomcat插件 -->
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <port>80</port>
                    <path>/</path>
                    <uriEncoding>UTF-8</uriEncoding>
                </configuration>
            </plugin>

            <!-- 编译插件 -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <!-- 资源仓库地址： 阿里云仓库 -->
    <repositories>
        <repository>
            <id>public</id>
            <name>aliyun nexus</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
            <releases>
                <enabled>true</enabled>
            </releases>
        </repository>
    </repositories>

    <!-- 插件仓库下载地址 -->
    <pluginRepositories>
        <pluginRepository>
            <id>public</id>
            <name>aliyun nexus</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>
</project>

pom.xml

在resources下创建spring.xml，并添加一下内容

<!-- 自动扫描的包 -->
    <context:component-scan base-package="com.wayne">
        <!-- 扫描是忽略的注解 -->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

在resources下创建springmvc.xml，并添加一下内容

<!-- 开启自动扫描 -->
    <context:component-scan base-package="com.wayne">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!-- 开启基于注解的mvc -->
    <mvc:annotation-driven/>

    <!-- 开启静态资源访问 -->
    <mvc:default-servlet-handler/>

    <!-- 配置视图解析器 -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

此时项目结构如下

spring mvc md5 签名验证 springmvc登录验证_xml_06

配置监听器及中央控制器，在web.xml中添加如下内容

<!-- 监听器 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring.xml</param-value>
    </context-param>

    <!-- 字符过滤器 -->
    <filter>
        <filter-name>encodingFilter</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>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!-- 配置中央控制器 -->
    <servlet>
        <servlet-name>springmvc</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>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

至此，项目基础配置完成，我们顺便将项目所用各包创建完成，稍后介绍各类所起作用，此时项目结构如下

spring mvc md5 签名验证 springmvc登录验证_spring_07

配置数据库连接

在resources下的config.properties中声明我们要访问的数据库

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/db_test
jdbc.username=你的数据库用户名
jdbc.password=你的数据库密码

在utils包下的ConnectionManager中配置数据库连接池

package com.wayne.utils;

import org.apache.commons.dbcp2.BasicDataSource;

import javax.sql.DataSource;
import java.io.IOException;
import java.util.Properties;

/**
 * 数据库连接池
 * @author Wayne
 * @date 2019/5/24
 */
public class ConnectionManager {

    private static BasicDataSource dataSource = new BasicDataSource();
    private static String DRIVER;
    private static String URL;
    private static String USERNAME;
    private static String PASSWORD;

    static {
        try {
            // 加载config.properties中配置的数据库连接信息
            Properties prop = new Properties();
       prop.load(ConnectionManager.class.getClassLoader().getResourceAsStream("config.properties"));
            DRIVER = prop.getProperty("jdbc.driver");
            URL = prop.getProperty("jdbc.url");
            USERNAME = prop.getProperty("jdbc.username");
            PASSWORD = prop.getProperty("jdbc.password");
        } catch (IOException e) {
            e.printStackTrace();
        }
        dataSource.setDriverClassName(DRIVER);
        dataSource.setUrl(URL);
        dataSource.setUsername(USERNAME);
        dataSource.setPassword(PASSWORD);
        
        // 配置数据库连接池参数
        dataSource.setInitialSize(2);
        dataSource.setMaxIdle(5);
        dataSource.setMinIdle(1);
        dataSource.setMaxWaitMillis(5000);
    }

    public static DataSource getConection() {
        return dataSource;
    }
}

在utils下的DBHelp编写CRUD工具类

package com.wayne.utils;

import com.wayne.exception.DataAccessException;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;

import java.sql.SQLException;

/**
 * CRUD工具类
 * @author Wayne
 * @date 2019/5/24
 */
public class DbHelp {

    // 从连接池中获得连接
    private static QueryRunner runner = new QueryRunner(ConnectionManager.getConection());

    /**
     * 新增
     * @param sql 待执行的SQL
     * @param rsh 结果集处理方式
     * @param params SQL中的参数
     * @param <T> 结果的类的详情信息
     * @throws DataAccessException SQL执行错误时抛出的异常
     */
    public static <T> T insert(String sql, ResultSetHandler<T> rsh, Object...params) throws DataAccessException {
        T t = null;
        try {
            t = runner.insert(sql, rsh, params);
        } catch (SQLException e) {
            throw new DataAccessException("执行: " + sql + "异常");
        }
        return t;
    }

    /**
     * @param sql 待执行的SQL
     * @param params 结果集处理方式
     * @throws DataAccessException SQL执行错误时抛出的异常
     */
    public static void update(String sql, Object... params) throws DataAccessException {
        try {
            runner.update(sql, params);
        } catch (SQLException e) {
            throw new DataAccessException("执行: " + sql + "异常");
        }
    }

    /**
     * @param sql 待执行的SQL
     * @param rsh 结果集处理方式
     * @param params SQL中的参数
     * @param <T> 结果的类的详情信息
     * @throws DataAccessException SQL执行错误时抛出的异常
     */
    public static <T> T query(String sql, ResultSetHandler<T> rsh, Object... params) throws DataAccessException {
        T t = null;
        try {
            t = runner.query(sql, rsh, params);
        } catch (SQLException e) {
            throw new DataAccessException("执行: " + sql + "异常");
        }
        return t;
    }
}

在exception包下自定义DataAccessException异常

package com.wayne.exception;

/**
 * 自定义异常类，用于转化sql异常
 * @author Wayne
 * @date 2019/5/24
 */
public class DataAccessException extends RuntimeException {
    private static final long serialVersionUID = 1L;

    public DataAccessException() {

    }

    public DataAccessException(String message) {
        super(message);
    }

    public DataAccessException(Throwable th) {
        super(th);
    }

    public DataAccessException(String message, Throwable th) {
        super(message, th);
    }
}

至此，工具类配置完成，可以开始写页面和接口了，我们顺带将登录页一并创建，此时项目结构如下

spring mvc md5 签名验证 springmvc登录验证_xml_08

业务代码

此时就可以开始写我们的登录流程了，文末会放出完整代码，此处就不再展示，只讲逻辑；

因为我们在web.xml中配置了index.jsp为欢迎页，所以当我们访问localhost:(端口号)时，会自动跳转到我们的index.jsp；
此种项目结构，WEB-INF包及其子包下的所有内容，是无法通过前端直接访问到的，所以我们在index.jsp做了一个向后台请求的动作，请求接口为/user/login.html,此接口通过请求转发，访问到login.jsp；

spring mvc md5 签名验证 springmvc登录验证_spring_09