Javaweb基础配置模板(mybatis+javaweb)

1.大纲规划图

本配置涉及的技术:mybatis,javaweb,json转换，分页查询等

2.导入相关的配置文件pom.xml

2.1 依赖文件

  <dependencies>
<!--    测试依赖--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><!--    mybatis代码生成器--><!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core --><dependency><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-core</artifactId><version>1.3.7</version></dependency><!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
<!--    mybatis依赖--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.6</version></dependency><!--    mysql8.0驱动依赖--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.31</version></dependency><!--    日志文件依赖--><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.12</version></dependency><!--servlet依赖--><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency><!--  hutools工具依赖包--><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.8.11</version></dependency><!--Json生成器--><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.3.3</version></dependency><!--beanUtils--><dependency><groupId>commons-beanutils</groupId><artifactId>commons-beanutils</artifactId><version>1.9.2</version><scope>compile</scope></dependency><!--    分页插件依赖--><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper</artifactId><version>5.2.1</version></dependency><!--    getXxx，setXxx方法注解依赖--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.26</version></dependency></dependencies>

2.2tomcat插件

<build><!--maven插件--><plugins><!--tomcat插件--><plugin><groupId>org.apache.tomcat.maven</groupId><!-- tomcat7的插件， 不同tomcat版本这个也不一样 --><artifactId>tomcat7-maven-plugin</artifactId><version>2.2</version><configuration><!-- 通过maven tomcat7:run运行项目时，访问项目的端口号 --><port>9090</port><!-- 项目访问路径  本例：localhost:9090,  如果配置的aa， 则访问路径为localhost:9090/aa--><path>/travel</path></configuration></plugin></plugins></build>

3.配置文件resources管理

3.1mybatis-config.xml核心配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><!--引入数据库连接的配置文件，jdbc.properties--><properties resource="jdbc.properties"/><!--    配置日志打印--><settings><setting name="logImpl" value="LOG4J"/><!--        如果只是单纯的下划线，可以在mybatis的核心配置文件中使用setting标签设置开启驼峰命名规则--><setting name="mapUnderscoreToCamelCase" value="true"/></settings><!--起别名，作用就是在mapper下的配置文件中使用增删改查返回数据类型和参数类型一般需要写实体类的全包名，使用别名可以省略包名--><!--这个需要修改，修改自己的对应的实体类--><typeAliases><package name="com.tz.entity"/></typeAliases><environments default="development"><environment id="development"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="${driver}"/><property name="url" value="${url}"/><property name="username" value="${username}"/><property name="password" value="${password}"/></dataSource></environment></environments><!--这个需要修改，修改自己的mapper--><mappers><!--扫描resource下的mapper映射文件包名-->
<!--        <package name="mappers/*"/>-->
<!--        <mapper resource="mappers/UserMapper.xml"/>--><package name="com.tz.mapper"></package></mappers></configuration>

3.2log4j.properties

# log4j.rootLogger日志输出类别和级别：只输出不低于该级别的日志信息DEBUG < INFO < WARN < ERROR < FATAL
# WARN：日志级别     CONSOLE：输出位置自己定义的一个名字       logfile：输出位置自己定义的一个名字
log4j.rootLogger=DEBUG,console
# 配置CONSOLE输出到控制台
log4j.appender.console = org.apache.log4j.ConsoleAppender
# 输出到控制台的方式
log4j.appender.console.Target = System.out
# ?????OFF?FATAL?ERROR?WARN?INFO?DEBUG?ALL
log4j.appender.console.Threshold = DEBUG
# 配置CONSOLE设置为自定义布局模式
log4j.appender.console.layout = org.apache.log4j.PatternLayout
# 日志输出格式
log4j.appender.console.layout.ConversionPattern=[%c]-%m%n# 其它包的调试级别
log4j.logger.org.mybatis=DEBUG
log4j.logger.java.sql=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.ResultSet=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

3.3jdbc.properties

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/travel
username=root
password=00000000

4.Mybatis代码生成器

代码生成器根据数据库自动生成entity，mapper以及resource下的sql映射文件

参考博客：mybatis代码生成器模板

5. 工具包util包下

5.1 密码加密工具Md5Util

import java.security.MessageDigest;/*** 写一个MD5算法,运行结果与MySQL的md5()函数相同* 将明文密码转成MD5密码* 123456->e10adc3949ba59abbe56e057f20f883e*/
public final class Md5Util {private Md5Util(){}/*** 将明文密码转成MD5密码 */public static String encodeByMd5(String password) throws Exception{//Java中MessageDigest类封装了MD5和SHA算法，今天我们只要MD5算法MessageDigest md5 = MessageDigest.getInstance("MD5");//调用MD5算法，即返回16个byte类型的值byte[] byteArray = md5.digest(password.getBytes());//注意：MessageDigest只能将String转成byte[]，接下来的事情，由我们程序员来完成return byteArrayToHexString(byteArray);}/*** 将byte[]转在16进制字符串 */private static String byteArrayToHexString(byte[] byteArray) {StringBuffer sb = new StringBuffer();//遍历for(byte b : byteArray){//16次//取出每一个byte类型，进行转换String hex = byteToHexString(b);//将转换后的值放入StringBuffer中sb.append(hex);}return sb.toString();}/*** 将byte转在16进制字符串 */private static String byteToHexString(byte b) {//-31转成e1，10转成0a，。。。//将byte类型赋给int类型int n = b;//如果n是负数if(n < 0){//转正数//-31的16进制数，等价于求225的16进制数 n = 256 + n;}//商(14)，数组的下标int d1 = n / 16;//余(1)，数组的下标int d2 = n % 16;//通过下标取值return hex[d1] + hex[d2];}private static String[] hex = {"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};/*** 测试*/public static void main(String[] args) throws Exception{String password = "123456";String passwordMD5 = Md5Util.encodeByMd5(password);System.out.println(password);System.out.println(passwordMD5);}
}

5.2 连接Mybatis工具包SqlSessionFactoryUtils

类名：SqlSessionFactoryUtils

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;import java.io.IOException;
import java.io.InputStream;public class SqlSessionFactoryUtils {private static SqlSessionFactory sqlSessionFactory;static {//静态代码块会随着类的加载而自动执行，且只执行一次try {String resource = "mybatis-config.xml";InputStream inputStream = Resources.getResourceAsStream(resource);sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);} catch (IOException e) {e.printStackTrace();}}public static SqlSessionFactory getSqlSessionFactory(){return sqlSessionFactory;}
}

5.3 分页工具PageBean

import java.util.List;/*** 分页对象*/
public class PageBean<T> {private long totalCount;//总记录数private int totalPage;//总页数private int currentPage;//当前页码private int pageSize;//每页显示的条数private List<T> list;//每页显示的数据集合public long getTotalCount() {return totalCount;}public void setTotalCount(long totalCount) {this.totalCount = totalCount;}public int getTotalPage() {return totalPage;}public void setTotalPage(int totalPage) {this.totalPage = totalPage;}public int getCurrentPage() {return currentPage;}public void setCurrentPage(int currentPage) {this.currentPage = currentPage;}public int getPageSize() {return pageSize;}public void setPageSize(int pageSize) {this.pageSize = pageSize;}public List<T> getList() {return list;}public void setList(List<T> list) {this.list = list;}
}

5.4 封装返回的结果ResultInfo

import java.io.Serializable;/*** 用于封装后端返回前端数据对象*/
public class ResultInfo implements Serializable {private boolean flag;//后端返回结果正常为true，发生异常返回falseprivate Object data;//后端返回结果数据对象private String errorMsg;//发生异常的错误消息//无参构造方法public ResultInfo() {}public ResultInfo(boolean flag) {this.flag = flag;}/*** 有参构造方法** @param flag* @param errorMsg*/public ResultInfo(boolean flag, String errorMsg) {this.flag = flag;this.errorMsg = errorMsg;}/*** 有参构造方法** @param flag* @param data* @param errorMsg*/public ResultInfo(boolean flag, Object data, String errorMsg) {this.flag = flag;this.data = data;this.errorMsg = errorMsg;}public boolean isFlag() {return flag;}public void setFlag(boolean flag) {this.flag = flag;}public Object getData() {return data;}public void setData(Object data) {this.data = data;}public String getErrorMsg() {return errorMsg;}public void setErrorMsg(String errorMsg) {this.errorMsg = errorMsg;}
}

5.5 产生UUID随机字符串工具类UuidUtil

import java.util.UUID;/*** 产生UUID随机字符串工具类*/
public final class UuidUtil {private UuidUtil(){}public static String getUuid(){return UUID.randomUUID().toString().replace("-","");}/*** 测试*/public static void main(String[] args) {System.out.println(UuidUtil.getUuid());System.out.println(UuidUtil.getUuid());System.out.println(UuidUtil.getUuid());System.out.println(UuidUtil.getUuid());}
}

5.6 专门存放常量的类

/*** 专门存放常量的类*/
public class Constants {public static final String CHECKCODE_SERVER = "CHECKCODE_SERVER";
}

6. 项目连接地址预告(黑马旅游网项目)

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