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Rebuild Project

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class="cursor-pointer"> 详细描述

拦截器和过滤器的区别？

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SSM

class="cursor-pointer"> 详细描述

tiles模板问题

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tiles

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 源码

<%@ taglib prefix="tiles" uri="http://tiles.apache.org/tags-tiles" %>
<%@ page  pageEncoding="UTF-8" contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="en">
<head>
    <tiles:insertAttribute name="head"/>
</head>
<body>
<tiles:insertAttribute name="header"/>
<tiles:insertAttribute name="body"/>
<tiles:insertAttribute name="footer"/>
</body>

</html>

Let's Encrypt 配置ssl证书

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知识扩展

class="cursor-pointer"> 详细描述

每次在实体类中get set比较麻烦, 有没有简单一点的办法

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知识扩展

class="cursor-pointer"> 详细描述

代码错误

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class="cursor-pointer"> 详细描述

class="cursor-pointer"> 源码

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

public class SQL {
    static Connection con; //声明Connection对象
    static PreparedStatement ps; //声明预处理对象
    static ResultSet res;          //声明结果集对象
    public Connection getConnection(){
        try{
            Class.forName("com.mysql.jdbc.Driver");
            con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/sos?characterEncoding=UTF-8","root","123456");
        }catch(Exception e){    // 这是用来执行异常
            e.printStackTrace(); //  e 是exception 引用对象， 来执行exception 里面的方法用e引用printStackTrace
        }
        return con;    //返回Connection对象
    }
    public static void main(String[]args){ // 主方法
        SQL c = new SQL();
        con = c.getConnection();
        try{
            ps = con.prepareCall("select*form hello where id =1");
            ps.setInt(1,1);  //设置参数
            res = ps.executeQuery();
           //如果当前记录不是结构集中最后一行，则进入循环体
            while(res.next()){
                int id = res.getInt(1);//获取结构集中第一列的值
                String name = res.getString("name");
                String hp = res.getString("hp");
                String ss = res.getString("ss");
                System.out.print("编号："+id);
                System.out.print("姓名："+name);
                System.out.print("性别："+hp);
                System.out.print("生日："+ss);
            }
        }catch(Exception e){
            e.printStackTrace();
        }
    }
}

log4j无论怎么配置都不能将日志输出到文件

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class="cursor-pointer"> 详细描述

class="cursor-pointer"> 源码

log4j.rootLogger=DEBUG,console,logFile
log4j.additivity.org.apache=true
# 控制台(console)
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Threshold=DEBUG
log4j.appender.console.ImmediateFlush=true
log4j.appender.console.Target=System.err
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n

# 日志文件(logFile)
log4j.appender.logFile=org.apache.log4j.FileAppender
log4j.appender.logFile.Threshold=DEBUG
log4j.appender.logFile.ImmediateFlush=true
log4j.appender.logFile.Append=true
log4j.appender.logFile.File=E:/logs/log4j.log
log4j.appender.logFile.layout=org.apache.log4j.PatternLayout
log4j.appender.logFile.layout.ConversionPattern=[%-5p] %d(%r) --> [%t] %l: %m %x %n

tomcat控制台乱码

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class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图