Maven基础&&Spring框架阶段常用工具类整理

常用工具类

1.密码加密工具类:

package com.itheima.utils;import java.security.MessageDigest;import sun.misc.BASE64Encoder;public class MD5Util {/*** 密码加密* @param password* @return* @throws Exception*/public static String md5(String password){try {//1.创建加密对象MessageDigest md5 = MessageDigest.getInstance(\"md5\");//2.加密密码byte[] by = md5.digest(password.getBytes());//3.创建编码对象BASE64Encoder encoder = new BASE64Encoder();//4.对结果编码return encoder.encode(by);}catch (Exception e){throw new RuntimeException(e);}}}

2.事务控制工具类:

package com.itheima.utils;import org.apache.ibatis.session.SqlSession;public class TransactionUtil {/*** 提交释放* @param sqlSession*/public static void commit(SqlSession sqlSession){if(sqlSession!=null) {sqlSession.commit();}}/*** 回滚释放* @param sqlSession*/public static void rollback(SqlSession sqlSession){if(sqlSession!=null) {sqlSession.rollback();}}/*** 单独释放* @param sqlSession*/public static void close(SqlSession sqlSession){if(sqlSession!=null) sqlSession.close();}}

3.填充表单数据到javabean的工具类:

package com.itheima.utils;import javax.servlet.http.HttpServletRequest;import org.apache.commons.beanutils.BeanUtils;import org.apache.commons.beanutils.ConvertUtils;import org.apache.commons.beanutils.converters.DateConverter;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.servlet.ServletFileUpload;import java.beans.PropertyDescriptor;import java.io.File;import java.lang.reflect.Method;import java.util.Date;import java.util.List;/*** 填充表单数据到javabean的工具类**/public class BeanUtil {/*** 封装表单中的数据到javabean中* @param request    表单中的数据* @param clazz    封装到哪个javabean* @return    封装好的javabean对象* 使用的是泛型。泛型必须先声明再使用。声明必须在返回值之前* T指的就是泛型，它可以是任意字符，只是作为一个占位符。* 声明时用什么字符，使用时就得用什么*/public static <T> T fillBean(HttpServletRequest request,Class<T> clazz){//1.定义一个T类型的javabeanT bean = null;try{//2.实例化bean对象bean = clazz.newInstance();//3.使用BeanUtils的方法进行封装BeanUtils.populate(bean, request.getParameterMap());//4.返回return bean;}catch(Exception e){throw new RuntimeException(e);}}/*** 封装表单中的数据到javabean中,带有日期格式数据* @param request    表单中的数据* @param clazz    封装到哪个javabean* @return    封装好的javabean对象* 使用的是泛型。泛型必须先声明再使用。声明必须在返回值之前* T指的就是泛型，它可以是任意字符，只是作为一个占位符。* 声明时用什么字符，使用时就得用什么*/public static <T> T fillBean(HttpServletRequest request,Class<T> clazz,String datePattern){//1.定义一个T类型的javabeanT bean = null;try{//2.实例化bean对象bean = clazz.newInstance();//3.创建日期转换器对象DateConverter converter = new DateConverter();converter.setPattern(datePattern);//4.设置转换器ConvertUtils.register(converter, Date.class);//5.使用BeanUtils的方法进行封装BeanUtils.populate(bean, request.getParameterMap());//6.返回return bean;}catch(Exception e){throw new RuntimeException(e);}}/*** 文件上传的表单填充* @param items    文件上传的表单项* @param clazz    要封装的实体类字节码* @param <T>    泛型* @return    返回封装好的对象*/public static <T> T fillBean(List<FileItem> items,Class<T> clazz){//1.定义一个T类型的javabeanT bean = null;try{//2.实例化Beanbean = clazz.newInstance();//3.遍历文件项集合for(FileItem item : items){//4.判断是不是文件if(item.isFormField()){//表单字段，不是文件//5.取出表单中的name属性取值String fieldName = item.getFieldName();//6.使用UTF-8字符集取出表单数据String fieldValue = item.getString(\"UTF-8\");//7.创建属性描述器对象PropertyDescriptor pd = new PropertyDescriptor(fieldName,clazz);//8.获取写方法(setXXX方法）Method method = pd.getWriteMethod();//9.把数据填充到bean中method.invoke(bean,fieldValue);}}//10.返回return bean;}catch(Exception e){throw new RuntimeException(e);}}}

4.dao接口代理实现类的工厂:

package com.itheima.factory;import org.apache.ibatis.io.Resources;import org.apache.ibatis.session.SqlSession;import org.apache.ibatis.session.SqlSessionFactory;import org.apache.ibatis.session.SqlSessionFactoryBuilder;import java.io.InputStream;/*** 用于生成dao接口代理实现类的工厂*/public class MapperFactory {private static SqlSessionFactory factory;private static ThreadLocal<SqlSession> tl = new ThreadLocal<SqlSession>();static {InputStream in = null;try {//1.读取mybatis主配置文件in = Resources.getResourceAsStream(\"SqlMapConfig.xml\");//2.创建构建者对象SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();//3.使用构建者创建SqlSessionFactory工厂factory = builder.build(in);}catch (Exception e){//打印异常信息到控制台e.printStackTrace();//抛出错误提示程序终止执行throw new ExceptionInInitializerError(\"初始化SqlSessionFactory失败\");}finally {//释放流对象if(in != null){try{in.close();}catch (Exception e){e.printStackTrace();}}}}/*** 获取SqlSession对象* @return* 保留此方法是为了后面对业务层方法增强，利用AOP添加事务*/public static SqlSession getSqlSession(){return factory.openSession(false);}/*** 获取Dao接口的代理实现类* @param daoClass dao接口字节码* @return*/public static <T> T getMapper(SqlSession sqlSession,Class<T> daoClass){//1.判断传入的SqlSession是否为nullif(sqlSession == null){return null;}//2.不为null，创建代理实现类return sqlSession.getMapper(daoClass);}}

5.解决请求响应乱码:

package com.itheima.web.controller.filter;import javax.servlet.*;import javax.servlet.annotation.WebFilter;import javax.servlet.annotation.WebInitParam;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;@WebFilter(value = \"/*\",initParams={@WebInitParam(name = \"encoding\",value = \"UTF-8\")})public class CharacterEncodingFilter implements Filter {private FilterConfig filterConfig;/*** 初始化方法，获取过滤器的配置对象* @param filterConfig* @throws ServletException*/@Overridepublic void init(FilterConfig filterConfig) throws ServletException {this.filterConfig = filterConfig;}@Overridepublic void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {//1.定义和协议相关的请求和响应对象HttpServletRequest request ;HttpServletResponse response;try{//2.把参数转换成协议相关的对象request = (HttpServletRequest)req;response = (HttpServletResponse)resp;//3.获取配置的字符集String encoding = filterConfig.getInitParameter(\"encoding\");//4.设置请求参数的字符集request.setCharacterEncoding(encoding);//5.设置响应对象输出响应正文时的字符集response.setContentType(\"text/html;charset=UTF-8\");//6.放行chain.doFilter(request,response);}catch (Exception e){e.printStackTrace();}}@Overridepublic void destroy() {//可以做一些清理操作}}

6.批量注入工具类:

package config.registrar;import org.springframework.beans.factory.support.BeanDefinitionRegistry;import org.springframework.context.annotation.ClassPathBeanDefinitionScanner;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;import org.springframework.core.io.support.PropertiesLoaderUtils;import org.springframework.core.type.AnnotationMetadata;import org.springframework.core.type.filter.AspectJTypeFilter;import org.springframework.core.type.filter.TypeFilter;import java.io.IOException;import java.util.Map;import java.util.Properties;public class CustomeImportBeanDefinitionRegistrar implements ImportBeanDefinitionRegistrar {private String expression;public CustomeImportBeanDefinitionRegistrar(){try {//初始化时指定加载的properties文件名Properties loadAllProperties = PropertiesLoaderUtils.loadAllProperties(\"import.properties\");//设定加载的属性名expression = loadAllProperties.getProperty(\"path\");} catch (IOException e) {e.printStackTrace();}}@Overridepublic void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {//1.定义扫描包的名称String[] basePackages = null;//2.判断有@Import注解的类上是否有@ComponentScan注解if (importingClassMetadata.hasAnnotation(ComponentScan.class.getName())) {//3.取出@ComponentScan注解的属性Map<String, Object> annotationAttributes = importingClassMetadata.getAnnotationAttributes(ComponentScan.class.getName());//4.取出属性名称为basePackages属性的值basePackages = (String[]) annotationAttributes.get(\"basePackages\");}//5.判断是否有此属性（如果没有ComponentScan注解则属性值为null，如果有ComponentScan注解，则basePackages默认为空数组）if (basePackages == null || basePackages.length == 0) {String basePackage = null;try {//6.取出包含@Import注解类的包名basePackage = Class.forName(importingClassMetadata.getClassName()).getPackage().getName();} catch (ClassNotFoundException e) {e.printStackTrace();}//7.存入数组中basePackages = new String[] {basePackage};}//8.创建类路径扫描器ClassPathBeanDefinitionScanner scanner = new ClassPathBeanDefinitionScanner(registry, false);//9.创建类型过滤器(此处使用切入点表达式类型过滤器)TypeFilter typeFilter = new AspectJTypeFilter(expression,this.getClass().getClassLoader());//10.给扫描器加入类型过滤器scanner.addIncludeFilter(typeFilter);//11.扫描指定包scanner.scan(basePackages);}}

常用坐标

spring常用坐标:

<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.8.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><dependencies><!--spring环境--><!--spring环境--><!--spring环境--><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.1.9.RELEASE</version></dependency><!--mybatis环境--><!--mybatis环境--><!--mybatis环境--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.3</version></dependency><!--mysql环境--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.47</version></dependency><!--spring整合jdbc--><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.1.9.RELEASE</version></dependency><!--spring整合mybatis--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>2.0.3</version></dependency><!--druid连接池--><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.16</version></dependency><!--AOP--><dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId><version>1.9.4</version></dependency><!--分页插件坐标--><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper</artifactId><version>5.1.2</version></dependency><!--springmvc环境--><!--springmvc环境--><!--springmvc环境--><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.1.9.RELEASE</version></dependency><!--jackson相关坐标3个--><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.0</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.9.0</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-annotations</artifactId><version>2.9.0</version></dependency><!--servlet环境--><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><!--jsp坐标--><dependency><groupId>javax.servlet.jsp</groupId><artifactId>jsp-api</artifactId><version>2.1</version><scope>provided</scope></dependency><!--导入校验的jsr303规范--><dependency><groupId>javax.validation</groupId><artifactId>validation-api</artifactId><version>2.0.1.Final</version></dependency><!--导入校验框架实现技术--><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-validator</artifactId><version>6.1.0.Final</version></dependency><dependency><groupId>org.jboss.logging</groupId><artifactId>jboss-logging</artifactId><version>3.3.2.Final</version></dependency><dependency><groupId>com.fasterxml</groupId><artifactId>classmate</artifactId><version>1.3.4</version></dependency><!--其他组件--><!--其他组件--><!--其他组件--><!--junit单元测试--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version></dependency><!--spring整合junit--><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>5.1.9.RELEASE</version></dependency><!--日志--><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>1.7.21</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.7.21</version></dependency><!--Dubbo的起步依赖，版本2.7之后统一为org.apache.dubbo --><dependency><groupId>org.apache.dubbo</groupId><artifactId>dubbo</artifactId><version>2.7.4.1</version></dependency><dependency><groupId>io.netty</groupId><artifactId>netty-all</artifactId><version>4.1.39.Final</version></dependency><dependency><groupId>org.yaml</groupId><artifactId>snakeyaml</artifactId><version>1.23</version></dependency><!--ZooKeeper客户端实现 --><dependency><groupId>org.apache.curator</groupId><artifactId>curator-framework</artifactId><version>4.0.0</version></dependency><!--ZooKeeper客户端实现 --><dependency><groupId>org.apache.curator</groupId><artifactId>curator-recipes</artifactId><version>4.0.0</version></dependency><!--web开发的起步依赖--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.1.0</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jetty</artifactId><version>2.1.8.RELEASE</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.47</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><version>2.1.8.RELEASE</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId><version>2.1.8.RELEASE</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-elasticsearch</artifactId><version>2.1.8.RELEASE</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId><version>2.1.8.RELEASE</version></dependency><dependency><groupId>de.codecentric</groupId><artifactId>spring-boot-admin-starter-server</artifactId><version>2.1.5</version></dependency><dependency><groupId>de.codecentric</groupId><artifactId>spring-boot-admin-starter-client</artifactId><version>2.1.5</version></dependency><dependency><groupId>redis.clients</groupId><artifactId>jedis</artifactId><version>2.9.3</version></dependency><!--引入es的坐标--><dependency><groupId>org.elasticsearch.client</groupId><artifactId>elasticsearch-rest-high-level-client</artifactId><version>7.4.0</version></dependency><dependency><groupId>org.elasticsearch.client</groupId><artifactId>elasticsearch-rest-client</artifactId><version>7.4.0</version></dependency><dependency><groupId>org.elasticsearch</groupId><artifactId>elasticsearch</artifactId><version>7.4.0</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.4</version></dependency><dependency><groupId>org.apache.rocketmq</groupId><artifactId>rocketmq-client</artifactId><version>4.5.2</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.8</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.4.0</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>2.1.8.RELEASE</version></plugin><plugin><groupId>org.apache.tomcat.maven</groupId><artifactId>tomcat7-maven-plugin</artifactId><version>2.1</version><configuration><port>80</port><path>/</path><uriEncoding>UTF-8</uriEncoding></configuration></plugin></plugins></build>

meaven基础常用坐标

<properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target></properties><dependencies><!--mybatis_--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.3</version></dependency><!--分页插件--><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper</artifactId><version>5.1.2</version></dependency><!--mysql--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.46</version></dependency><!--druid数据源--><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.21</version></dependency><!--junit--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope></dependency><!-- servlet3.0 --><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><!--jsp--><dependency><groupId>javax.servlet.jsp</groupId><artifactId>javax.servlet.jsp-api</artifactId><version>2.3.3</version><scope>provided</scope></dependency><!--bean-utils--><dependency><groupId>commons-beanutils</groupId><artifactId>commons-beanutils</artifactId><version>1.9.4</version></dependency><!--apache工具包--><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.9</version></dependency><!--jstl--><dependency><groupId>jstl</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency><!--jackson--><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-annotations</artifactId><version>2.9.0</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-core</artifactId><version>2.9.0</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.0</version></dependency><!--文件上传--><dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.3.1</version></dependency><!--POI--><dependency><groupId>org.apache.poi</groupId><artifactId>poi</artifactId><version>4.0.1</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml</artifactId><version>4.0.1</version></dependency><dependency><groupId>org.apache.poi</groupId><artifactId>poi-ooxml-schemas</artifactId><version>4.0.1</version></dependency></dependencies><build><plugins><!--tomcat插件--><plugin><groupId>org.apache.tomcat.maven</groupId><artifactId>tomcat7-maven-plugin</artifactId><version>2.1</version><configuration><port>80</port><path>/</path><uriEncoding>utf-8</uriEncoding></configuration></plugin></plugins></build>