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mybatis 找不到映射器

1

mybatis

class="cursor-pointer"> 详细描述

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idea打完jar包后，在dos窗口里运行jar包

1

maven

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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配置文件beans标签报红

0

1

spring

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

Element 'beans' cannot have character [children], because the type's content type is element-only.

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log4j写入文件的时候打印信息是红字

0

1

class="cursor-pointer"> 详细描述

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java

1

JDBC

class="cursor-pointer"> 详细描述

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项目IDEA 执行maven test控制台输出乱码

2

1

maven

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

 <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
        <spring.version>4.3.0.RELEASE</spring.version>
    </properties>

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执行数据库更新语句时报错

0

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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为什么for的双循环插入数据会更快呢

1

数据库

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

 public void insertUserTest() throws IOException {

        //mybatis配置文件
        String resource = "SqlMapConfig.xml";

        //得到配置文件流
        InputStream inputStream = Resources.getResourceAsStream(resource);

        //创建会话工厂，传入mybatis的配置文件信息
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);

        //通过工厂得到SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();


        long start = System.currentTimeMillis();
        List<User> userList = new ArrayList<User>();
        try{
        for (int l = 0; l <1; l++) {
            for (int i =0; i < 100001; i++) {
                User user = new User();
                user.setId(i);
                user.setUsername("庄" + i);
                userList.add(user);
                System.out.println(user.getId());
                if (i % 100000 == 0) {
                    sqlSession.selectList("test.insertUser", userList);
                    userList.clear();//清空list
                }
            }
        }
        //提交事务
        sqlSession.commit();
//        sqlSession.close();
        long end = System.currentTimeMillis();
        System.out.println("插入1000000数据所需时间" + (end - start) + "ms" + "=" + ((end - start) / 1000) + "s");
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        finally {
            sqlSession.close();
        }
    }

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mysql在阿里云上连接失败的原因？

1

数据库

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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导入junit包出错

1

junit

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

  @Test
    public void test1() {
        Student student = new Student();
        student.setId("010");
        student.setAge(15);
        student.setName("哈哈");
        student.setSex("女");
        studentService.saveStudent(student);
        System.out.println(student);
        }

java.lang.Exception: No runnable methods

at org.junit.runners.BlockJUnit4ClassRunner.validateInstanceMethods(BlockJUnit4ClassRunner.java:166)
	at org.junit.runners.BlockJUnit4ClassRunner.collectInitializationErrors(BlockJUnit4ClassRunner.java:102)
	at org.junit.runners.ParentRunner.validate(ParentRunner.java:344)
	at org.junit.runners.ParentRunner.<init>(ParentRunner.java:74)
	at org.junit.runners.BlockJUnit4ClassRunner.<init>(BlockJUnit4ClassRunner.java:55)
	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.<init>(SpringJUnit4ClassRunner.java:104)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:31)
	at org.junit.vintage.engine.discovery.DefensiveAllDefaultPossibilitiesBuilder$DefensiveAnnotatedBuilder.buildRunner(DefensiveAllDefaultPossibilitiesBuilder.java:74)
	at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:24)
	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
	at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:29)
	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
	at org.junit.vintage.engine.discovery.TestClassRequestResolver.createRunnerTestDescriptor(TestClassRequestResolver.java:54)
	at org.junit.vintage.engine.discovery.VintageDiscoverer.lambda$discover$0(VintageDiscoverer.java:53)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
	at java.util.Iterator.forEachRemaining(Iterator.java:116)
	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:312)
	at java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:743)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
	at org.junit.vintage.engine.discovery.VintageDiscoverer.discover(VintageDiscoverer.java:55)
	at org.junit.vintage.engine.VintageTestEngine.discover(VintageTestEngine.java:65)
	at org.junit.platform.launcher.core.DefaultLauncher.discoverEngineRoot(DefaultLauncher.java:130)
	at org.junit.platform.launcher.core.DefaultLauncher.discoverRoot(DefaultLauncher.java:117)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:90)
	at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:65)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)