<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[New_new_zero的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/New_new_zero</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; New_new_zero]]></copyright><item><title><![CDATA[msg:“org.mybatis.spring.MyBatisSystemException：nested exception is org.apache.ibatis.exceptions.Pers]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/146917619</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/146917619</guid><author>New_new_zero</author><pubDate>Tue, 01 Apr 2025 17:14:57 +0800</pubDate><description><![CDATA[在使用java查询sql返回list<实体>报错，原因是返回的实体上加了@Builder但没有实现无参构造导致Mybatis查询报错，搭配@NoArgsConstructor解决。]]></description><category></category></item><item><title><![CDATA[MySQL加密解密（核心方法：AES_ENCRYPT加密、AES_DECRYPT解密、HEX字符串转换为十六进制值、UNHEX十六进制值转换为字符串、CONVERT数据类型转换）]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/142130282</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/142130282</guid><author>New_new_zero</author><pubDate>Wed, 11 Sep 2024 10:01:04 +0800</pubDate><description><![CDATA[【代码】MySQL加密解密，解决返回null和解密值不一致问题（核心方法：AES_ENCRYPT加密、AES_DECRYPT解密、HEX字符串转换为十六进制值、UNHEX十六进制值转换为字符串、CONVERT数据类型转换）]]></description><category></category></item><item><title><![CDATA[使用ObjectMapper解析JSON忽略实体内不存在字段]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/141216383</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/141216383</guid><author>New_new_zero</author><pubDate>Thu, 15 Aug 2024 10:50:05 +0800</pubDate><description><![CDATA[【代码】使用ObjectMapper解析JSON忽略实体内不存在字段。]]></description><category></category></item><item><title><![CDATA[JAVA List＜实体类 ＞转 List＜Map＞自定义方法]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/135870653</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/135870653</guid><author>New_new_zero</author><pubDate>Fri, 26 Jan 2024 17:02:20 +0800</pubDate><description><![CDATA[【代码】JAVA List＜实体类 ＞转 List＜Map＞自定义方法。]]></description><category></category></item><item><title><![CDATA[java hutool包的异步执行方法，简单好用]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/135870340</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/135870340</guid><author>New_new_zero</author><pubDate>Fri, 26 Jan 2024 16:52:58 +0800</pubDate><description><![CDATA[【代码】java hutool包的异步执行方法，简单好用。]]></description><category></category></item><item><title><![CDATA[服务器日志中java打印堆栈异常信息]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/135868076</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/135868076</guid><author>New_new_zero</author><pubDate>Fri, 26 Jan 2024 15:48:33 +0800</pubDate><description><![CDATA[import org.springblade.core.tool.utils.Exceptions;

try {
} catch(Exception e) {
	//开发调试用
	e.printStackTrace();
	//生产日志排查用
	log.error(Exceptions.getStackTraceAsString(e));
}

别再用e.Message()了，还不如e.toString()呢

]]></description><category></category></item><item><title><![CDATA[jdk8创建并初始化map的方法]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/135843568</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/135843568</guid><author>New_new_zero</author><pubDate>Thu, 25 Jan 2024 14:22:32 +0800</pubDate><description><![CDATA[【代码】jdk8创建并初始化map的方法。]]></description><category></category></item><item><title><![CDATA[Java Convert方法替换强转]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/135556559</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/135556559</guid><author>New_new_zero</author><pubDate>Fri, 12 Jan 2024 16:44:18 +0800</pubDate><description><![CDATA[【代码】Java Convert方法替换强转。]]></description><category></category></item><item><title><![CDATA[mybatis plus的lambdaQueryWrapper的or()方法正确用法]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/134975490</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/134975490</guid><author>New_new_zero</author><pubDate>Wed, 13 Dec 2023 16:29:22 +0800</pubDate><description><![CDATA[利用and拼接，尽量与其他公共条件分开写。]]></description><category></category></item><item><title><![CDATA[解决mybatis plus分页page方法返回大于500条/页数据失效问题]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/134974950</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/134974950</guid><author>New_new_zero</author><pubDate>Wed, 13 Dec 2023 16:20:09 +0800</pubDate><description><![CDATA[没有lambdaQueryWrapper查询条件时可以直接用xxxService.page(new page<>(pageNum, -1))，缺点是会丢失总数。xxxService.page(new page<>(pageNum, 501), lambdaQueryWrapper)，最小改动使其返回正确数量。]]></description><category></category></item><item><title><![CDATA[stream()转map转list、distinct()去重、判断空值、sorted排序正序多字段排序]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/124147934</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/124147934</guid><author>New_new_zero</author><pubDate>Wed, 13 Apr 2022 14:51:38 +0800</pubDate><description><![CDATA[stream()转map转list、distinct()去重、判断空值、sorted排序正序多字段排序]]></description><category></category></item><item><title><![CDATA[DBCP连接演示]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/115856754</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/115856754</guid><author>New_new_zero</author><pubDate>Wed, 21 Apr 2021 10:30:11 +0800</pubDate><description><![CDATA[package jdbc.connection_pool.dbcp;

import org.apache.commons.dbcp.BasicDataSource;
import org.junit.jupiter.api.Test;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
 * 连接池内部使用四大参数创建了Co]]></description><category></category></item><item><title><![CDATA[C3P0连接演示]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/115856715</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/115856715</guid><author>New_new_zero</author><pubDate>Mon, 19 Apr 2021 09:06:43 +0800</pubDate><description><![CDATA[package jdbc.connection_pool.c3p0;

import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.junit.Test;

import java.beans.PropertyVetoException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Stat]]></description><category></category></item><item><title><![CDATA[JDBC常用方法连接MySQL数据库 连接Oracle数据库 插入数据  查找表 删除多个指定表 动态插入数据 删除数据 查询该表所有数据  显示表的结构]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/115856662</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/115856662</guid><author>New_new_zero</author><pubDate>Mon, 19 Apr 2021 09:05:26 +0800</pubDate><description><![CDATA[package jdbc.base;

import java.sql.*;

/**
 * 参考资料：https://blog.youkuaiyun.com/u010297791/article/details/52637868
 * &lt;p&gt;
 * 操作的一般过程
 * &lt;p&gt;
 * &lt;p&gt;
 * 1、连接数据库
 * &lt;p&gt;
 * 2、调用Class.forName()方法加载驱动程序。
 * &lt;p&gt;
 * 3、调用DriverManager对象的getC]]></description><category></category></item><item><title><![CDATA[模拟QueryRunner]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/115856544</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/115856544</guid><author>New_new_zero</author><pubDate>Mon, 19 Apr 2021 09:03:11 +0800</pubDate><description><![CDATA[package dbutils;

import com.mchange.v2.c3p0.ComboPooledDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class 模拟QueryRunner&lt;T&gt; {]]></description><category></category></item><item><title><![CDATA[QueryRunner的常用方法]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/115856448</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/115856448</guid><author>New_new_zero</author><pubDate>Mon, 19 Apr 2021 09:00:13 +0800</pubDate><description><![CDATA[package dbutils;

import my_jdbc_utils.jdbc_utils2.JdbcUtils2;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;
import org.apache.commons.dbutils.handlers.*;
import org.junit.Test;

import java.sql.Connecti]]></description><category></category></item><item><title><![CDATA[DBUtils介绍]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/115856419</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/115856419</guid><author>New_new_zero</author><pubDate>Mon, 19 Apr 2021 08:59:39 +0800</pubDate><description><![CDATA[1　DBUtils简介
DBUtils是Apache Commons组件中的一员，开源免费！
DBUtils是对JDBC的简单封装，但是它还是被很多公司使用！
jar：commons-dbutils.jar
2　DBUtils主要类
DbUtils：都是静态方法，一系列的close()方法；
QueryRunner：
update()：执行insert、update、delete；DDL、DML
* int update(String sql, Object… params) --&gt;  可执行增]]></description><category></category></item><item><title><![CDATA[AJAXServlet响应jsp]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/115856234</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/115856234</guid><author>New_new_zero</author><pubDate>Mon, 19 Apr 2021 08:54:30 +0800</pubDate><description><![CDATA[package ajax.ajax;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOExce]]></description><category></category></item><item><title><![CDATA[AJAX介绍]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/115856161</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/115856161</guid><author>New_new_zero</author><pubDate>Mon, 19 Apr 2021 08:52:57 +0800</pubDate><description><![CDATA[ajax是什么?


asynchronous javascript and xml：异步的js和xml
它能使用js访问服务器，而且是异步访问！
服务器给客户端的响应一般是整个页面，一个html完整页面！但在ajax中因为是局部刷新，那么服务器就不用再响应整个页面！而只是数据！

text：纯文本
xml：大家都熟悉！！！
json：它是js提供的数据交互格式，它在ajax中最受欢迎！




异步交互和同步交互


同步：

发一个请求，就要等待服务器的响应结束，然后才能发第二个请求！中间这段时间就是.]]></description><category></category></item><item><title><![CDATA[schema的基本使用]]></title><link>https://blog.youkuaiyun.com/New_new_zero/article/details/115856135</link><guid>https://blog.youkuaiyun.com/New_new_zero/article/details/115856135</guid><author>New_new_zero</author><pubDate>Mon, 19 Apr 2021 08:51:57 +0800</pubDate><description><![CDATA[person.xml
&lt;?xml version="1.0" encoding="UTF-8" standalone="no"?&gt;
&lt;person xmlns:xmlnsAlias="http://www.w3.org/2001/XMLSchema-instance"
        xmlns="http://XSD//8080"
        xmlnsAlias:schemaLocation="http://XSD//8080 xsd约束.xsd"
        id1="我是必]]></description><category></category></item></channel></rss>