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spring boot

记录一下最近整理的spring boot项目

项目地址：https://gitee.com/xl0917/spring-boot

1.选择Spring Initializr 一直点击next，直到创建完成

2.创建spring boot子模块，创建无任何模板的maven项目

3.项目结构

commone——公共类及工具类存放处，可在该项目中引入其他工具jar包
entity——实体类层
dao——数据持久层
api——service接口，配置double及注册中心可供rpc消费端调用
service——业务逻辑
webapp——web项目url请求入口

4.pom.xml文件

父类pom文件

<?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>
    <packaging>pom</packaging>
    <modules>
        <module>backstage-common</module>
        <module>backstage-dao</module>
        <module>backstage-entiy</module>
        <module>backstage-api</module>
        <module>backstage-service</module>
        <module>backstage-webapp</module>
    </modules>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>


    <groupId>com.xulong</groupId>
    <artifactId>com.xulong.backstage</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>backstage</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>



</project>

common层pom.xml文件

<?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">
    <parent>
        <artifactId>com.xulong.backstage</artifactId>
        <groupId>com.xulong</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>backstage-common</artifactId>


</project>

entity层pom文件

<?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">
    <parent>
        <artifactId>com.xulong.backstage</artifactId>
        <groupId>com.xulong</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>backstage-entiy</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.2</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>build-helper-maven-plugin</artifactId>
                <version>3.0.0</version>
            </plugin>
        </plugins>
    </build>
</project>

dao层pom文件

<?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">
    <parent>
        <artifactId>com.xulong.backstage</artifactId>
        <groupId>com.xulong</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>backstage-dao</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.xulong</groupId>
            <artifactId>backstage-entiy</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-typehandlers-jsr310</artifactId>
            <version>1.0.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>build-helper-maven-plugin</artifactId>
                <version>3.0.0</version>
            </plugin>
        </plugins>
    </build>

</project>

api层pom文件

<?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">
    <parent>
        <artifactId>com.xulong.backstage</artifactId>
        <groupId>com.xulong</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>backstage-api</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.xulong</groupId>
            <artifactId>backstage-entiy</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.xulong</groupId>
            <artifactId>backstage-common</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

service层pom文件

<?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">
    <parent>
        <artifactId>com.xulong.backstage</artifactId>
        <groupId>com.xulong</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>backstage-service</artifactId>

    <dependencies>
        <dependency>
            <groupId>com.xulong</groupId>
            <artifactId>backstage-api</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.xulong</groupId>
            <artifactId>backstage-dao</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.6</version>
        </dependency>
        <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-spring</artifactId>
            <version>1.3.2</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.6</version>
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.44</version>
                    </dependency>
                </dependencies>
                <configuration>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>build-helper-maven-plugin</artifactId>
                <version>3.0.0</version>
            </plugin>
        </plugins>
    </build>
</project>

webapp层pom文件

<?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">
    <parent>
        <artifactId>com.xulong.backstage</artifactId>
        <groupId>com.xulong</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.xulong</groupId>
    <artifactId>backstage-webapp</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>



    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.xulong</groupId>
            <artifactId>backstage-service</artifactId>
            <version>0.0.1-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <!--<exclusions>-->
                <!--<exclusion>-->
                    <!--<groupId>org.springframework.boot</groupId>-->
                    <!--<artifactId>spring-boot-starter-tomcat</artifactId>-->
                <!--</exclusion>-->
            <!--</exclusions>-->
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-test</artifactId>
                </exclusion>
            </exclusions>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.jayway.jsonpath</groupId>
            <artifactId>json-path</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.44</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-test</artifactId>
            <version>1.5.6.RELEASE</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>

        <!--<dependency>-->
            <!--<groupId>org.apache.tomcat</groupId>-->
            <!--<artifactId>tomcat-juli</artifactId>-->
            <!--<version>${tomcat.version}</version>-->
        <!--</dependency>-->

        <!--<dependency>-->
            <!--<groupId>org.apache.tomcat.embed</groupId>-->
            <!--<artifactId>tomcat-embed-jasper</artifactId>-->
        <!--</dependency>-->
    </dependencies>

    <build>
        <finalName>backstage-webapp</finalName>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <configuration>
                        <mainClass>com.xulong.backstage.BackstageApplication</mainClass>
                        <executable>true</executable>
                    </configuration>
                    <executions>
                        <execution>
                            <goals>
                                <goal>repackage</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-war-plugin</artifactId>
                    <configuration>
                        <failOnMissingWebXml>false</failOnMissingWebXml>
                    </configuration>
                    <version>2.5</version>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

5.配置文件application.properties

#数据库链接配置
spring.datasource.url=jdbc:mysql://**.**.***.***:3306/backstage?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&zeroDateTimeBehavior=convertToNull&useSSL=false
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=

server.port=8080


mybatis.mapper-locations=classpath:mybatis/mapper/*Mapper*.xml
mybatis.configuration.log-prefix=com.xulong.backstage.dao


#静态资源
#表示所有的访问都经过静态资源路径
spring.mvc.static-path-pattern=/static/**
#在这里表示配置静态资源根路径
spring.resources.static-locations=classpath:/static/

#mvc跳转路径
Thymeleaf.prefix=classpath:/templates/

#热部署生效
spring.devtools.restart.enabled=true
#静态文件热部署
spring.thymeleaf.cache=false

#显示sql语句
logging.level.com.xulong.backstage.dao.mapper=debug

#pagehelper分页插件配置
pagehelper.helper-dialect=mysql
pagehelper.offset-as-page-num=true
pagehelper.row-bounds-with-count=true
pagehelper.page-size-zero=false
pagehelper.reasonable=false
pagehelper.support-methods-arguments=true
pagehelper.params=pageNum=page;pageSize=size;count=countSql;

6.mybatis.generator插件配置

generatorConfig.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
    PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
    "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
    <properties resource="META-INF/mybatis/generator.properties"/>
    <!-- 指定数据连接驱动jar地址 -->
    <classPathEntry location="D:softwaremvn_repomysqlmysql-connector-java5.1.44mysql-connector-java-5.1.44.jar" />
 <context id="MySQLTables"
             targetRuntime="MyBatis3">

        <property name="javaFileEncoding" value="UTF-8"/>
        <property name="addGWTInterface" value="false"/>
        <property name="suppressJavaInterface" value="false"/>

        <plugin type="org.mybatis.generator.plugins.SerializablePlugin"/>
        <!--<plugin type="org.META-INF.mybatis.mapper.generator.plugins.GuavaStyleToStringPlugin"/>-->
<!-- 去掉生成出来的代码的注解 -->
        <commentGenerator>
            <property name="suppressAllComments" value="true" />
            <property name="suppressDate" value="true" />
        </commentGenerator>

        <!-- 数据库连接url、用户名、密码 -->
        <jdbcConnection
            driverClass="${jdbc.driverClass}"
            connectionURL="${jdbc.url}"
            userId="${jdbc.username}"
            password="${jdbc.password}">
        </jdbcConnection>

        <javaTypeResolver>
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>
<!-- 生成模型的包名和位置 -->
        <javaModelGenerator
            targetProject="../${module.domain}/src/main/java"
            targetPackage="${package.domain}">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
            <property name="constructorBased" value="false"/>
        </javaModelGenerator>

        <!-- 生成映射文件的包名和位置 -->
        <sqlMapGenerator
            targetProject="../${module.dao}/src/main/resources"
            targetPackage="mybatis/mapper">
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>

        <!-- 生成DAO的包名和位置 -->
        <javaClientGenerator
            targetProject="../${module.dao}/src/main/java"
            targetPackage="${package.mapper}"
            type="XMLMAPPER">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
<table tableName="role_info" domainObjectName="RoleInfo"
               enableSelectByExample="false"
               enableCountByExample="false"
               enableDeleteByExample="false"
               enableUpdateByExample="false">
            <property name="useActualColumnNames" value="false"/>
            <property name="selectAllOrderByClause" value="role_code DESC"/>
            <!--<generatedKey column="stock_code" sqlStatement="MySql" identity="true"/>-->
        </table>

    </context>
</generatorConfiguration>

引入文件generator.properties配置

jdbc.driverClass = com.mysql.jdbc.Driver
jdbc.url = jdbc:mysql://**.**.***.***:3306/backstage?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&zeroDateTimeBehavior=convertToNull&useSSL=false
jdbc.username = root
jdbc.password = 

module.domain = backstage-entiy
module.dao = backstage-dao

package.mapper = com.xulong.backstage.dao.mapper
package.domain = com.xulong.backstage.entity
driverPath = D:
epository4mysqlmysql-connector-java5.1.44mysql-connector-java-5.1.44.jar

jdk.use_jdk8_time = true

7.shiro框架配置

java类方式配置

package com.xulong.backstage;

import org.apache.shiro.mgt.SecurityManager;
import org.apache.shiro.spring.LifecycleBeanPostProcessor;
import org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.mgt.DefaultWebSecurityManager;
import org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.DependsOn;

import java.util.LinkedHashMap;


/**
 * @author xulong
 * shiro 安全框架配置
 */

@Configuration
public class ShiroConfiguration {

    //==============Shiro================
    /**
     * 配置SecurityManager对象(Shiro核心)
     * @param userUserRealm
     * @return
     */
    @Bean("securityManager")
    public DefaultWebSecurityManager newDefaultWebSecurityManager(ShiroUserRealm userUserRealm){
        DefaultWebSecurityManager sManager = new DefaultWebSecurityManager();
        sManager.setRealm(userUserRealm);
        return sManager;
    }

    @Bean("shiroFilter")
    public ShiroFilterFactoryBean newShiroFilterFactory(
            @Autowired SecurityManager securityManager){
        ShiroFilterFactoryBean bean = new ShiroFilterFactoryBean();
        bean.setSecurityManager(securityManager);
        //未登录跳转的url
        bean.setLoginUrl("/login.html");
        LinkedHashMap<String,String> fcMap = new LinkedHashMap<>();
        fcMap.put("/login.html", "anon");
        fcMap.put("/validateLogin.html","anon");
        fcMap.put("/test","anon");


        //退出url
        fcMap.put("/logout.html", "logout");
        //放开静态文件权限
        fcMap.put("/static/**","anon");

        fcMap.put("/**", "authc"); //必须授权才能访问  authc
        bean.setFilterChainDefinitionMap(fcMap);
        //登录成功跳转的url
        bean.setSuccessUrl("/index.html");
        return bean;
    }
    /**
     * 配置shiro生命周期管理器
     * @return
     */
    @Bean("lifecycleBeanPostProcessor")
    public LifecycleBeanPostProcessor newLifecycleBeanPostProcessor(){
        return new LifecycleBeanPostProcessor();
    }

    /**
     * 配置shiro注解应用
     * */
    @DependsOn(value="lifecycleBeanPostProcessor")
    @Bean
    public DefaultAdvisorAutoProxyCreator newDefaultAdvisorAutoProxyCreator(){
        return new DefaultAdvisorAutoProxyCreator();
    }

    @Bean
    public AuthorizationAttributeSourceAdvisor newAuthorizationAttributeSourceAdvisor(SecurityManager securityManager){
        AuthorizationAttributeSourceAdvisor bean= new AuthorizationAttributeSourceAdvisor();
        bean.setSecurityManager(securityManager);
        return bean;
    }



}

登录验证类

package com.xulong.backstage;

import com.xulong.backstage.common.constants.DictCodeConstants;
import com.xulong.backstage.dao.mapper.UserMapper;
import com.xulong.backstage.entity.User;
import org.apache.shiro.authc.*;
import org.apache.shiro.authc.credential.CredentialsMatcher;
import org.apache.shiro.authc.credential.HashedCredentialsMatcher;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @author xulong
 * shiro 验证登录等类
 */
@Service
public class ShiroUserRealm extends AuthorizingRealm {

    @Autowired
    private UserMapper userMapper;

    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
        //1.获取客户端提交的用户信息
        UsernamePasswordToken upToken = (UsernamePasswordToken)token;
        String username = upToken.getUsername();
        upToken.getPassword();
        User user = userMapper.findUserByUserCode(username);
        if(user == null){
            throw new AuthenticationException("用户名或密码不正确！");
        }
        if(DictCodeConstants.DICT_100002_1.equals(user.getUserStatus())){
            throw new AuthenticationException("账户已被冻结，请联系管理员！");
        }
        if(DictCodeConstants.DICT_100002_2.equals(user.getUserStatus())){
            throw new AuthenticationException("账户已被禁用，请联系管理员！");
        }
        SimpleAuthenticationInfo simple =
                new SimpleAuthenticationInfo(
                        user,　　//传入对象后，后续可以在shiro中获取登录用户的对象信息
                        user.getPassword(),
                        getName());
        return simple;//返回给认证管理器
    }
    /**
     * 此方法用于获取用户权限信息----执行权限操作
     */
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principal) {

        return null;
    }

    /**
     * 设置凭证匹配器
     */
    @Override
    public void setCredentialsMatcher(CredentialsMatcher credentialsMatcher) {
        //密码验证是否成功方法,比如密码错误有其它操作或者有自己的校验要求
        CustomCredentialsMatcher cMatcher = new CustomCredentialsMatcher();
        super.setCredentialsMatcher(cMatcher);
    }
}

密码验证类

package com.xulong.backstage;

import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.UsernamePasswordToken;
import org.apache.shiro.authc.credential.SimpleCredentialsMatcher;

import java.util.Objects;

public class CustomCredentialsMatcher extends SimpleCredentialsMatcher {

    @Override
    public boolean doCredentialsMatch(AuthenticationToken token, AuthenticationInfo info) {
        UsernamePasswordToken utoken=(UsernamePasswordToken) token;
        String dbPassword = (String) info.getCredentials();
        String inPassword = new String(utoken.getPassword());
        boolean fals = Objects.equals(dbPassword, inPassword);
        if(fals == false){
            //更改当前用户登录错误次数，当错误次数大于3冻结当前用户
            throw new AuthenticationException("用户名或密码不正确！");
        }
        return fals;
    }
}

8.thymeleaf部分使用

例如：当数据库存储时间格式为20190401092416，在网页中想显示为2091-04-01 09:24:16，但是thtmeleaf未提供方法转换，需要我们写一个转换类

DateUtil类写一个格式转换方法

package com.xulong.backstage.common.util;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @author xulong
 * @date 2019/03/26
 */
public class DateUtil {

    /** 模式 :yyyyMMddHHmmss */
    public static final String YYYYMMDD_HHMMSS = "yyyyMMddHHmmss";
    /** 模式 :yyyyMMdd */
    public static final String YYYYMMDD = "yyyyMMdd";
    /** 模式 :yyyyMM */
    public static final String YYYYMM = "yyyyMM";
    /** 模式 :HHmmss */
    public static final String HHMMSS = "HHmmss";
    /** 模式 :HHmm */
    public static final String HHMM = "HHmm";

    public static final String FORMAT_YMDHMS = "yyyy-MM-dd HH:mm:ss";

    public static final String DATE_FORMAT_DAY = "yyyy-MM-dd";

    /**
     * 获取当前日期的数字格式
     * 如20190326
     * @return
     */
    public static Long getNowDate(){
        Date date = new Date();
        return Long.valueOf(date2String(date,YYYYMMDD));
    }

    /**
     * 获取当前时间的数字格式
     * 如20190326141225
     * @return
     */
    public static Long getNowDateTime(){
        Date date = new Date();
        return Long.valueOf(date2String(date,YYYYMMDD_HHMMSS));
    }


    /**
     * longFormat:(long类型的日期转化为格式化日期字符串，如20160717122121转化为2016-07-17 12:21:21)
     * @param srcLong long类型的日期如20160717122121
     * @param pattern 格式化日期字符串如2016-07-17 12:21:21
     * @return
     */
    public static String longFormat(Long srcLong,String pattern){
        if (srcLong == null) {
            return "";
        }
        if (srcLong == 0) {
            return "0";
        }
        Date date = string2Date(String.valueOf(srcLong));
        return date2String(date,pattern);
    }

    /**
     * intFormat:(long类型的日期转化为格式化日期字符串，如20160717转化为2016-07-17)
     *
     * @param src     Integer 类型的日期如20160717122121
     * @param pattern 格式化日期字符串如2016-07-17 12:21:21
     * @return
     * @throws
     * @since DateUtils.java　Ver 1.0
     */
    public static String intFormat(Integer src, String pattern) {
        if (src == null) {
            return "";
        }
        if (src == 0) {
            return "0";
        }
        Date date = string2Date(String.valueOf(src));
        return date2String(date, pattern);
    }

    /**
     * 方法说明：日期类型按照指定格式转成字符串.
     *
     * @param date
     * @param pattern
     * @return
     */
    public static String date2String(Date date, String pattern) {
        if (null == date) {
            date = new Date();
        }
        if (pattern.length() == 0 || pattern == null) {
            pattern = FORMAT_YMDHMS;
        }
        try {
            return getDateFormat(pattern).format(date);
        } catch (Exception e) {
            throw new RuntimeException("日期转换异常");
        }
    }

    /**
     * 方法说明：字符串转日期类型.
     *
     * @param date
     * @return
     */
    public static Date string2Date(String date) {
        try {
            if (date.length() == 8) {
                return getDateFormat(YYYYMMDD).parse(date);
            } else if (date.length() == 14) {
                return getDateFormat(YYYYMMDD_HHMMSS).parse(date);
            } else if (date.length() == 6) {
                return getDateFormat(HHMMSS).parse(date);
            } else {
                return null;
            }
        } catch (Exception e) {
            throw new RuntimeException("日期转换异常");
        }
    }


    /**
     * 获取指定日期指定格式的日期字符串
     * @return
     */
    private static String getDate(String pattern,Date date){
        SimpleDateFormat format = getDateFormat(pattern);
        return format.format(date);
    }


    /**
     * 获取指定模式pattern的SimpleDateFormat对象
     * @param str
     * @return
     */
    private static SimpleDateFormat getDateFormat(String str){
       return new SimpleDateFormat(str);
    }



}

在控制层封装DateUtil对象

 @RequestMapping("/index.html")
    public String index(Model model){
        model.addAttribute("dateUtil",new DateUtil());
        Long date = 20160824121425L;
        model.addAttribute("date",date);
        return "index";
    }

html页面中书写方式

<div class="row" style="text-align:center;font-size: 60px;color: #00aced;margin-top:10%">
                  欢迎来到后台管理页面<br>
                  <span th:text="${dateUtil.longFormat(da,'YYYY-MM-dd HH:mm:ss')}"></span>
              </div>

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原文地址：https://www.cnblogs.com/jin-Xi/p/10634530.html