java常用基础配置文件

比眉伴天荒 2022-05-22 10:09 135阅读 0赞

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## mybatis.xml ##

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" 
                    "http://mybatis.org/dtd/mybatis-3-config.dtd">
    <configuration>
        <environments default="development">
            <environment id="development">
                
                <transactionManager type="JDBC" />
                
                <dataSource type="POOLED">
                    <property name="driver" value="com.mysql.jdbc.Driver" />
                    <property name="url" value="jdbc:mysql://localhost:3306/usermanager" />
                    <property name="username" value="root" />
                    <property name="password" value="111111" />
                </dataSource>
            </environment>
        </environments>
    
        <mappers>
            
            
            
            <mapper class="com.dao.UserMapper"/> 
        </mappers>
    </configuration>

## spring.xml ##

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xmlns:context="http://www.springframework.org/schema/context"
        xmlns:aop="http://www.springframework.org/schema/aop"
        xsi:schemaLocation="
            http://www.springframework.org/schema/beans 
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/context 
            http://www.springframework.org/schema/context/spring-context.xsd
            http://www.springframework.org/schema/aop 
            http://www.springframework.org/schema/aop/spring-aop.xsd">
    
        
        <context:component-scan base-package="com.dao"></context:component-scan>
        <context:component-scan base-package="com.service"></context:component-scan>
        <context:component-scan base-package="com.web.controller"></context:component-scan>
    
        
        <context:property-placeholder location="classpath:jdbc.properties"/>
    
        
        <bean id="dataSource" class="org.apache.tomcat.dbcp.dbcp.BasicDataSource">
            <property name="driverClassName" value="${jdbc.driver}"></property>
            <property name="url" value="${jdbc.url}"></property>
            <property name="username" value="${jdbc.username}"></property>
            <property name="password" value="${jdbc.password}"></property>
            <property name="initialSize" value="${jdbc.initialSize}"></property>
            <property name="maxActive" value="${jdbc.maxActive}"></property>
        </bean>
    
        
        <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
            <property name="dataSource" ref="dataSource"></property>
        </bean>
    
    </beans>

## 类加载过程代码 ##

public class TestJDBCDemo {
    
        public void func(Object... array){
            for(Object data : array){
                System.out.print(data + " ");
            }
            System.out.println();
        }
    
        public void testJDBC(){
            //DriverManager   Connection   Statement(容易造成SQL注入式错误)  Preparement(带预编译的SQL)
    
        }
    
        public static int count(){
             return 1%9;
        }
    
        public static void main(String[]args) throws Exception{
             //System.out.println(count());
    
            try {
                Class<?> userclass = Class.forName("com.bean.User",true,new MyClassLoader());
                Object user = (userclass.newInstance());
            } catch (ClassNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    
    class MyClassLoader extends ClassLoader{
    
        //根据类的包路径，在指定路径下去寻找class字节码文件
        @Override
        protected Class<?> findClass(String name1) throws ClassNotFoundException {
            // TODO Auto-generated method stub
            String root = "D:/";
            //D:/com/bean/User.class
            String path = root+name1.replace(".", "/")+".class";
            File file = new File(path);
            System.out.println("name:" + path);
    
            byte[] buff = null;
    
            try {
                FileInputStream in = new FileInputStream(file);
                buff = new byte[in.available()];
                int len = in.read(buff);
                in.close();
    
                //defineClass 就是从class字节码文件中生成类的Class对象
                Class<?> c = this.defineClass(name1, buff, 0, buff.length);
                return c;
            } catch (FileNotFoundException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
    
            return super.findClass(path);
        }
    }

## Tomcat的server.xml设置 ##

## log4j（根目录下） ##

## debug 级别
    
    log4j.rootLogger=DEBUG,Console
    
    
    
    log4j.appender.Console=org.apache.log4j.ConsoleAppender  
    
    log4j.appender.Console.Target=System.out  
    
    log4j.appender.Console.layout = org.apache.log4j.PatternLayout  
    
    log4j.appender.Console.layout.ConversionPattern=%d{yyyy-MM-dd-HH\:mm\:ss,SSS} [%t]  [%c] [%p] - %m%n  
    
    
    
    log4j.logger.com.mybatis=DEBUG  /
    
    
    ##输出sql 语句
    
    log4j.logger.java.sql.Connection=DEBUG  
    
    log4j.logger.java.sql.Statement=DEBUG  
    
    log4j.logger.java.sql.PreparedStatement=DEBUG</strong>