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Mybatis执行删除和插入数据时报错 integer?

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1

mybatis

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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为什么输出中文乱码？

1

1

JDBC

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class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

package jdbc;

import java.sql.*;

public class Jdbctest {
    private static final String URL = "jdbc:mysql://localhost:3306/lianxi?useUnicode=true&characterEncoding=utf-8&useSSL=true";
    private static final String NAME = "root";
    private static final String PASSWORD = "123456";

    public static void main(String[] args) throws Exception {
        Class.forName("com.mysql.jdbc.Driver");
        Connection conn = DriverManager.getConnection(URL, NAME, PASSWORD);
        Statement stmt = conn.createStatement();
        ResultSet rs = stmt.executeQuery("select name,age from tanghaiqing;");
        while (rs.next()) {
            System.out.println(rs.getString("name") + "" + rs.getInt("age"));
        }
        rs.close();
        stmt.close();
        conn.close();
        System.out.println("测试该类");
    }
}

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使用JUnit进行单元测试时报错

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1

class="cursor-pointer"> 详细描述

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使用插件junit建立的测试类不识别编码UTF-8

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1

spring

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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获取接口后调用出现空指针异常

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1

JDBC

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

class="cursor-pointer"> 源码

2018-11-23 09:57:12.836  INFO 1436 --- [           main] c.j.s.ProjectStarter                     : Starting ProjectStarter on MS01 with PID 1436 (H:\Java\Code\ideaCode\FristSpringBoot\target\classes started by user in H:\Java\Code\ideaCode\FristSpringBoot)
2018-11-23 09:57:12.854  INFO 1436 --- [           main] c.j.s.ProjectStarter                     : No active profile set, falling back to default profiles: default
2018-11-23 09:57:13.819  INFO 1436 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!
2018-11-23 09:57:13.822  INFO 1436 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2018-11-23 09:57:13.847  INFO 1436 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 15ms. Found 0 repository interfaces.
2018-11-23 09:57:14.357  INFO 1436 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$54631726] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-11-23 09:57:14.815  INFO 1436 --- [           main] o.s.b.w.e.t.TomcatWebServer              : Tomcat initialized with port(s): 8080 (http)
2018-11-23 09:57:14.837  INFO 1436 --- [           main] o.a.c.c.StandardService                  : Starting service [Tomcat]
2018-11-23 09:57:14.837  INFO 1436 --- [           main] o.a.c.c.StandardEngine                   : Starting Servlet Engine: Apache Tomcat/9.0.13
2018-11-23 09:57:14.843  INFO 1436 --- [           main] o.a.c.c.AprLifecycleListener             : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jdk-10.0.2\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;F:\oracle\product\10.2.0\db_1\bin;C:\ProgramData\Oracle\Java\javapath;C:\Program Files\Intel\iCLS Client\;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Java\jdk1.8.0_151\\bin;% ANDROID_SDK_HOME%\platform-tools;% ANDROID_SDK_HOME%\tools;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;H:\Java\tool\apache-maven-3.5.4\bin;C:\Program Files (x86)\MySQL\MySQL Server 5.7\bin;C:\Tools\putty\;C:\Tools\WinSCP\;C:\Tools\SVN\bin;C:\Tools\jetty-distribution-9.4.11.v20180605\bin;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Tools\Git\cmd;H:\Java\tool\spring-2.1.0.RELEASE\bin;C:\Users\user\AppData\Local\Microsoft\WindowsApps;C:\Users\user\AppData\Local\GitHubDesktop\bin;%USERPROFILE%\AppData\Local\Microsoft\WindowsApps;;.]
2018-11-23 09:57:14.958  INFO 1436 --- [           main] o.a.c.c.C.[.[.[/h]                       : Initializing Spring embedded WebApplicationContext
2018-11-23 09:57:14.958  INFO 1436 --- [           main] o.s.w.c.ContextLoader                    : Root WebApplicationContext: initialization completed in 1982 ms
2018-11-23 09:57:14.958  INFO 1436 --- [           main] w.s.c.ServletWebServerApplicationContext : Restoring user defined scope request
2018-11-23 09:57:14.959  INFO 1436 --- [           main] w.s.c.ServletWebServerApplicationContext : Restoring user defined scope session
2018-11-23 09:57:15.020  INFO 1436 --- [           main] f.a.AutowiredAnnotationBeanPostProcessor : Autowired annotation is not supported on static fields: static com.jnshu.springbootsecurity.service.AccountService com.jnshu.springbootsecurity.ProjectStarter.accountService
2018-11-23 09:57:15.020  INFO 1436 --- [           main] f.a.AutowiredAnnotationBeanPostProcessor : Autowired annotation is not supported on static fields: static com.jnshu.springbootsecurity.service.StudentInfoService com.jnshu.springbootsecurity.ProjectStarter.studentInfoService
2018-11-23 09:57:15.020  INFO 1436 --- [           main] f.a.AutowiredAnnotationBeanPostProcessor : Autowired annotation is not supported on static fields: static com.jnshu.springbootsecurity.service.StudentService com.jnshu.springbootsecurity.ProjectStarter.studentService
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.ibatis.reflection.Reflector (file:/H:/Java/maven_repos/org/mybatis/mybatis/3.4.4/mybatis-3.4.4.jar) to method java.lang.Object.finalize()
WARNING: Please consider reporting this to the maintainers of org.apache.ibatis.reflection.Reflector
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
2018-11-23 09:57:15.506  INFO 1436 --- [           main] o.s.s.c.ThreadPoolTaskExecutor           : Initializing ExecutorService 'applicationTaskExecutor'
2018-11-23 09:57:15.991  INFO 1436 --- [           main] o.s.s.w.DefaultSecurityFilterChain       : Creating filter chain: any request, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@31006a75, org.springframework.security.web.context.SecurityContextPersistenceFilter@491893f8, org.springframework.security.web.header.HeaderWriterFilter@20c3b34b, org.springframework.security.web.csrf.CsrfFilter@708769b7, org.springframework.security.web.authentication.logout.LogoutFilter@77c692b4, org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter@531a716c, org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter@4cc7e3ad, org.springframework.security.web.authentication.ui.DefaultLogoutPageGeneratingFilter@49122853, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@7019d619, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@46e388ec, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@3d235635, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@e97f115, org.springframework.security.web.session.SessionManagementFilter@58e02359, org.springframework.security.web.access.ExceptionTranslationFilter@6ed51944, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@55638165]
2018-11-23 09:57:16.079  INFO 1436 --- [           main] o.s.b.w.e.t.TomcatWebServer              : Tomcat started on port(s): 8080 (http) with context path '/h'
2018-11-23 09:57:16.082  INFO 1436 --- [           main] c.j.s.ProjectStarter                     : Started ProjectStarter in 4.159 seconds (JVM running for 5.71)
111111111111
java.lang.NullPointerException
	at com.jnshu.springbootsecurity.ProjectStarter.main(ProjectStarter.java:51)

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IO流写入文件乱码

0

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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用管理员权限打不开数据库

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1

数据库

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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jsp 调用数据库 timestamp 时间异常。

1

1

DB设计 spring

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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输出了一串奇怪的字符

1

1

class="cursor-pointer"> 详细描述

class="cursor-pointer"> 错误截图

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mybatis 找不到映射器

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1

mybatis

class="cursor-pointer"> 详细描述

去第页

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