Spring中常見問題

1.NoSuchBeanDefinitionException

2.’..Service’ that could not be found service找不到

3.port 80 was already in use 端口號被占用

4.TemplateInputException 模板解析異常或找不到模板

1.檢查模板所在的目錄是否與配置的前綴目錄相同 2.檢查返回的模板是否存在,返回值類型是否一致 3.檢查配置前綴時是否以'/'斜杠結尾 4.控制層的url與客戶端的ur是否一致

5. 404異常 訪問資源不存在

6. 500異常 500異常要查看控制臺

Mybatis中常見問題

1.springboot中添加maven依賴

2.BadSqlGrammarException 錯誤的sql語句

3.BindingException 綁定異常

1.檢查映射文件的路徑配置與實際存儲位置是否一致 2.檢查dao接口的類名是否與映射文件的namespace值相同(不能有空格) 3.檢查dao接口中的方法名是否在映射文件中有對應的id

4.IllegalArgumentException

原因:同樣說我sql映射是否出現了重復性的定義(例如:分別以注解方式和xml配置文件方式進行定義,也就是說在同一個namespace下出現了重復的元素id)

5.SAXParseException xml解析問題

補充問題一：Mapper類 autowired失敗

原因：掃描mapper包沒有配置或配置不正確

解決：

方案一：

1. 啟動類加@MapperScan('mapperPackagePath')

方案二：

增加配置類：

package com.yx.readingwebsite.config; import org.mybatis.spring.mapper.MapperScannerConfigurer;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration; /** * MapperScannerConfigurer 配置DAO層 */ @Configurationpublic class MyBatisMapperScannerConfig { @Bean public MapperScannerConfigurer getMapperScannerConfigurer(){ MapperScannerConfigurer msc = new MapperScannerConfigurer(); msc.setSqlSessionFactoryBeanName('sqlSessionFactory'); msc.setBasePackage('com.yx.readingwebsite.mapper'); return msc; }}問題二：Mapper掃描成功后，繼續報錯，org.apache.ibatis.binding.BindingException: Invalid bound statement (not found):

原因：xml的mapper SQL 和 Mapper接口沒有綁定

解決：

方案一：全局配置文件application.yml增加mybatis配置【xml mapper包在resource目錄下】

mybatis: mapper-locations: classpath:mapper/*.xml

方案二：增加配置類

package com.yx.readingwebsite.config; import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.SqlSessionTemplate;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.io.Resource;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import org.springframework.jdbc.datasource.DataSourceTransactionManager;import org.springframework.transaction.PlatformTransactionManager;import org.springframework.transaction.annotation.EnableTransactionManagement;import org.springframework.transaction.annotation.TransactionManagementConfigurer; import javax.sql.DataSource; /** * 配置MyBatis,引入數據源，sqlSessionFactory,sqlSessionTemplate,事務管理器 */ @Configuration //配置類@EnableTransactionManagement //允許使用事務管理器public class MyBatisModelConfig implements TransactionManagementConfigurer { @Autowired private DataSource dataSource; @Bean(name = 'sqlSessionFactory') public SqlSessionFactory getSqlSessionFactory(){ SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean(); ssfb.setDataSource(dataSource); //設置數據源 ssfb.setTypeAliasesPackage('com.yx.readingwebsite.model'); //設置掃描模型包【po】 try { Resource[] resources = new PathMatchingResourcePatternResolver() .getResources('classpath:mapper/*.xml'); ssfb.setMapperLocations(resources); return ssfb.getObject(); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException(); } } @Bean //獲得Session 模板，從而獲得Session public SqlSessionTemplate getSqlSessionTemplate(SqlSessionFactory sqlSessionFactory){ return new SqlSessionTemplate(sqlSessionFactory); } @Override //事務管理器 public PlatformTransactionManager annotationDrivenTransactionManager() { return new DataSourceTransactionManager(dataSource); }}

需要注意的是，xml版的mybatis一定要在sqlSessionFactory中指定mapperLocations,即下圖

總結：兩種配置方案。方案一，使用配置類；方案二，使用配置文件。完整配置如下：

方案一：配置類

package com.yx.readingwebsite.config; import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.SqlSessionTemplate;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.io.Resource;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import org.springframework.jdbc.datasource.DataSourceTransactionManager;import org.springframework.transaction.PlatformTransactionManager;import org.springframework.transaction.annotation.EnableTransactionManagement;import org.springframework.transaction.annotation.TransactionManagementConfigurer; import javax.sql.DataSource; /** * 配置MyBatis,引入數據源，sqlSessionFactory,sqlSessionTemplate,事務管理器 */ @Configuration //配置類@EnableTransactionManagement //允許使用事務管理器public class MyBatisModelConfig implements TransactionManagementConfigurer { @Autowired private DataSource dataSource; @Bean(name = 'sqlSessionFactory') public SqlSessionFactory getSqlSessionFactory(){ SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean(); ssfb.setDataSource(dataSource); //設置數據源 ssfb.setTypeAliasesPackage('com.yx.readingwebsite.model'); //設置掃描模型包【po】 try { Resource[] resources = new PathMatchingResourcePatternResolver() .getResources('classpath:mapper/*.xml'); ssfb.setMapperLocations(resources); return ssfb.getObject(); } catch (Exception e) { e.printStackTrace(); throw new RuntimeException(); } } @Bean //獲得Session 模板，從而獲得Session public SqlSessionTemplate getSqlSessionTemplate(SqlSessionFactory sqlSessionFactory){ return new SqlSessionTemplate(sqlSessionFactory); } @Override //事務管理器 public PlatformTransactionManager annotationDrivenTransactionManager() { return new DataSourceTransactionManager(dataSource); }}

package com.yx.readingwebsite.config; import org.mybatis.spring.mapper.MapperScannerConfigurer;import org.springframework.boot.autoconfigure.AutoConfigureAfter;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration; /** * MapperScannerConfigurer 配置DAO層 */ @Configuration@AutoConfigureAfter(MyBatisModelConfig.class)public class MyBatisMapperScannerConfig { @Bean public MapperScannerConfigurer getMapperScannerConfigurer(){ MapperScannerConfigurer msc = new MapperScannerConfigurer(); msc.setSqlSessionFactoryBeanName('sqlSessionFactory'); msc.setBasePackage('com.yx.readingwebsite.mapper'); return msc; }}

方案二：配置文件 application.yml

spring: datasource: url: jdbc:mysql://127.0.0.1:3306/readingWebsite?useUnicode=true&characterEncoding=utf-8 username: password: driver-class-name: com.mysql.jdbc.Driver max-active: 100 max-idle: 10 max-wait: 10000 default-auto-commit: false time-between-eviction-runs-millis: 30000 min-evictable-idle-time-millis: 30000 test-while-idle: true test-on-borrow: true test-on-return: true validation-query: SELECT 1 mybatis: mapper-locations: classpath:mapper/*.xml

package com.yx.readingwebsite; import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication@MapperScan('com.yx.readingwebsite')public class ReadingWebsiteApplication { public static void main(String[] args) { SpringApplication.run(ReadingWebsiteApplication.class, args); } }

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