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javabean
T 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javabean
T 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javabean
T bean = null;
try{
//2.实例化Bean
bean = 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null
if(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
*/
@Override
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}@Override
public 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();
}
}@Override
public 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();
}
}@Override
public 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>