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标签用resource可以找到文件，用class找不到文件

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1

mybatis

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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mybatis 查询全表时发生异常

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1

mybatis

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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为什么增加索引和未增加索引查询和插入时间相差不大？

1

DB设计

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 源码

package action;

import mapper.UserService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import pojo.User;

/**
 * 测试循环调用1000次
 */
public class Main {
    public static void main(String[] args) {

        long startTime = System.currentTimeMillis();

       try {
           ApplicationContext context = new ClassPathXmlApplicationContext("spring-mybatis.xml");
           UserService userService = context.getBean(UserService.class);
           for (int i = 0; i < 1000000; i++) {
               User user = new User();
               int x = (int) (Math.random() * 1000)+10000;
               String mix = "MIX3S" + x;
               String pwx = "guess" + x;
               user.setName(mix);
               user.setPassword(pwx);
               userService.insert(user);
           }
       }catch (Exception e){
           System.out.println("连接中断!");
       }
        long endTime = System.currentTimeMillis();
        long totalTime = endTime-startTime;
        System.out.println("测试时间："+totalTime+"毫秒");
    }
}

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int型和String型可以互换吗？

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1

class="cursor-pointer"> 详细描述

该问题已被官方收录

mybatis配置文件无法创建Mapper bean

1

mybatis

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

<!--mapper的扫描器，将包下边的mapper接口自动创建代理对象-->
    <!--自动创建到spring容器中，bean的id是mapper的类名（首字母小写）-->
    <bean id="Mapper" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.fgh.task2.dao" />
        <property name="sqlSessionFactoryBeanName" ref="sqlSessionFactory"/>
    </bean>

idea 2018.1.2  spring 4.13
配置文件
 
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-orm</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>
    
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>

<dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${spring.version}</version>
    </dependency>

<dependency>
      <groupId>cglib</groupId>
      <artifactId>cglib-nodep</artifactId>
      <version>2.2</version>
    </dependency>

<dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.8.11</version>
    </dependency>

<dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.39</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.1</version>
    </dependency>
    
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.1</version>
    </dependency>

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Java有关类数组的初始化问题

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1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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maven命令使用插件生成jar包运行失败

1

maven

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 源码

 <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-jar-plugin</artifactId>
          <version>2.6</version>
          <configuration>
            <archive>
              <manifest>
                <addClasspath>true</addClasspath>
                <classpathPrefix>lib/</classpathPrefix>
                <mainClass>com.zyq.test.C3P0ConnectionTest</mainClass>
              </manifest>
            </archive>
          </configuration>
        </plugin>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-dependency-plugin</artifactId>
          <version>2.10</version>
          <executions>
            <execution>
              <id>copy-dependencies</id>
              <phase>package</phase>
              <goals>
                <goal>copy-dependencies</goal>
              </goals>
              <configuration>
                <outputDirectory>${project.build.directory}/lib</outputDirectory>
              </configuration>
            </execution>
          </executions>
        </plugin>

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java的继承和多态的问题，有哪位大神回复一下吗？

1

mybatis

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图