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>

    <dependency>
      <groupId>junitgroupId>
      <artifactId>junitartifactId>
      <version>4.11version>
      <scope>testscope>
    dependency>


    
    <dependency>
      <groupId>org.mybatis.generatorgroupId>
      <artifactId>mybatis-generator-coreartifactId>
      <version>1.3.7version>
    dependency>

    

    <dependency>
      <groupId>org.mybatisgroupId>
      <artifactId>mybatisartifactId>
      <version>3.5.6version>
    dependency>
  

    <dependency>
      <groupId>mysqlgroupId>
      <artifactId>mysql-connector-javaartifactId>
      <version>8.0.31version>
    dependency>

    
    <dependency>
      <groupId>log4jgroupId>
      <artifactId>log4jartifactId>
      <version>1.2.12version>
    dependency>

    
    <dependency>
      <groupId>javax.servletgroupId>
      <artifactId>javax.servlet-apiartifactId>
      <version>3.1.0version>
      <scope>providedscope>
    dependency>



    <dependency>
      <groupId>cn.hutoolgroupId>
      <artifactId>hutool-allartifactId>
      <version>5.8.11version>
    dependency>


    
    <dependency>
      <groupId>com.fasterxml.jackson.coregroupId>
      <artifactId>jackson-databindartifactId>
      <version>2.3.3version>
    dependency>

    
    <dependency>
      <groupId>commons-beanutilsgroupId>
      <artifactId>commons-beanutilsartifactId>
      <version>1.9.2version>
      <scope>compilescope>
    dependency>
  

    <dependency>
      <groupId>com.github.pagehelpergroupId>
      <artifactId>pagehelperartifactId>
      <version>5.2.1version>
    dependency>
  

    <dependency>
      <groupId>org.projectlombokgroupId>
      <artifactId>lombokartifactId>
      <version>1.18.26version>
    dependency>
    
  dependencies>

2.2tomcat插件

<build>
    
    <plugins>
      
      <plugin>
        <groupId>org.apache.tomcat.mavengroupId>
        
        <artifactId>tomcat7-maven-pluginartifactId>
        <version>2.2version>
        <configuration>
          
          <port>9090port>
          
          <path>/travelpath>
        configuration>
      plugin>

    plugins>
  build>

3.配置文件resources管理

3.1mybatis-config.xml核心配置文件

DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    
    <properties resource="jdbc.properties"/>
    
    <settings>
        <setting name="logImpl" value="LOG4J"/>
        
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    settings>
    
    
    <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>
    
    
    <mappers>
        


        <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false
    private 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";
}

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