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已经有了slf4j-api-1.6.1.jar包仍然输出时报错

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log4j

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class="cursor-pointer"> 错误截图

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JDBC驱动问题

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JDBC

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class="cursor-pointer"> 错误截图

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连接mysql数据库时有关SSL连接的警告

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JDBC

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

Fri Jan 11 10:25:40 CST 2019 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.

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根据官网任务异常不能成功捕捉

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数据库

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 源码

import Util.C3P0ConnUtil;
import org.apache.log4j.Logger;


import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class Test {
    @org.junit.Test
    public void test() {
        Logger logger=Logger.getLogger(Test.class);

        Connection connection = C3P0ConnUtil.getConnection();
        System.out.println(connection);
        for (int i = 0; i < 100000; i++) {
            try {
                PreparedStatement stmt = connection.prepareStatement("insert into person (name,age,QQ) values ('loop', '18', '77967')");
//                PreparedStatement stmt = connection.prepareStatement("delete from person where QQ = '20111111'");
                stmt.execute();
                System.out.println("插入成功");
            } catch (SQLException e) {
                e.printStackTrace();
                System.out.println("报错 " + e);
            }
            C3P0ConnUtil.closeconn(connection);
        }
//        logger.info("gyggg");
    }
}

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@Autowired 注解接口TnDao，不能实例化

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spring

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class="cursor-pointer"> 源码

@Service
public class TnService {

    @Autowired
    private TnDao tnDao;

    private static ApplicationContext context;

    static {
        context = new
                ClassPathXmlApplicationContext("applicationContext.xml");
    }

    public static void main(String[] args) {
        TnService ts = new TnService();
//        ts.tnDao = (TnDao) context.getBean("tnDao");
        Trainees tn = ts.findById(2033);
        System.out.println(tn);
    }

    public Trainees findById(int id) {
        Trainees tn = tnDao.findById(id);
        return tn;
    }

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用管理员权限打不开数据库

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数据库

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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quazt加载数据库错误

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1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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Github无法克隆task

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1

linux命令

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class="cursor-pointer"> 错误截图

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mybtis向数据库插入信息时,不能插入中文

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mybatis

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maven打包包含sring框架

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maven

class="cursor-pointer"> 详细描述

使用maven-shade-plugin打包包含spring框架程序
 <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>3.1.1</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <transformers>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <mainClass>start</mainClass>
                                </transformer>
运行时报错，说找不到xml文件

参考博客https://blog.csdn.net/daiyutage/article/details/53739452
原因是Spring Framework的多个jar包中包含相同的文件spring.handlers和spring.schemas，如果生成一个jar包会互相覆盖。为了避免互相影响，可以使用AppendingTransformer来对文件内容追加合并：

添加
  <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/spring.handlers</resource>
                                </transformer>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/spring.schemas</resource>
                                </transformer>
                            </transformers>
打包运行后正常