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解决springboot整合druid遇到的坑

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springboot整合druid的坑

项目环境

  • springboot 2.1.6.RELEASE
  • jdk 1.8

pom.xml配置

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>2.1.6.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <groupId>com.test</groupId>    <artifactId>page</artifactId>    <version>0.0.1-SNAPSHOT</version>    <name>page</name>    <description>Demo project for Spring Boot</description>    <properties>        <java.version>1.8</java.version>        <druid.version>1.1.10</druid.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>druid-spring-boot-starter</artifactId>            <version>${druid.version}</version>        </dependency>        <!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->        <dependency>            <groupId>org.mybatis.spring.boot</groupId>            <artifactId>mybatis-spring-boot-starter</artifactId>            <version>2.0.1</version>        </dependency>        <!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper-spring-boot-starter -->        <dependency>            <groupId>com.github.pagehelper</groupId>            <artifactId>pagehelper-spring-boot-starter</artifactId>            <version>1.2.5</version>        </dependency>        <dependency>            <groupId>org.projectlombok</groupId>            <artifactId>lombok</artifactId>        </dependency>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>fastjson</artifactId>            <version>1.2.28</version>        </dependency>        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-compiler-plugin</artifactId>                <configuration>                    <source>1.8</source>                    <target>1.8</target>                    <encoding>UTF-8</encoding>                </configuration>            </plugin>        </plugins>    </build></project>

application.yml

server:  port: 8001spring:  datasource:    type: com.alibaba.druid.pool.DruidDataSource    druid:      mysql:        name: mysql        url: jdbc:mysql://localhost:3306/user?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=UTC        driver-class-name: com.mysql.cj.jdbc.Driver        username: root        password: root        # 下面为连接池的补充设置，应用到上面所有数据源中        # 初始化大小，最小，最大        initialSize: 5        minIdle: 5        maxActive: 20        # 配置获取连接等待超时的时间        maxWait: 60000#      oracle:#        name: oracle#        url: jdbc:oracle:thin:@127.0.0.1:1521:ORCL#        username: zs#        password: 123456#        initialSize: 5#        minIdle: 5#        maxActive: 20#        maxWait: 60000mybatis:  mapper-locations:  - classpath*:mapper/*.xml

配置数据源时有个问题：username,password,url,driver-class-name既可以配在spring.datasource下面，也可以配置在spring.datasource.druid下面.

如果直接配在spring.datasource下面，当配置多个数据源时，不方便指定前缀.

如果配置在spring.datasource.druid下面，需要在配置类（@Configuration）中获取相应的值。如果不配置会报找不到url,driver-class-name的错.

DruidDataSourceConfiguration配置类

package com.test.page.config;import com.alibaba.druid.filter.stat.StatFilter;import com.alibaba.druid.pool.DruidDataSource;import com.alibaba.druid.support.http.StatViewServlet;import com.alibaba.druid.support.http.WebStatFilter;import com.alibaba.druid.wall.WallConfig;import com.alibaba.druid.wall.WallFilter;import org.apache.ibatis.session.SqlSessionFactory;import org.mybatis.spring.SqlSessionFactoryBean;import org.mybatis.spring.SqlSessionTemplate;import org.mybatis.spring.annotation.MapperScan;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.web.servlet.FilterRegistrationBean;import org.springframework.boot.web.servlet.ServletRegistrationBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;@Configuration@MapperScan(sqlSessionTemplateRef = "mysqlSqlSessionTemplate",basePackages = "com.test.page.dao")public class DruidDataSourceConfiguration {    private static final String PRE="spring.datasource.druid.mysql.";    @Value("${"+PRE+"url}")    private String url;    @Value("${"+PRE+"driver-class-name}")    private String driverClassName;    @Value("${"+PRE+"username}")    private String username;    @Value("${"+PRE+"password}")    private String password;    @Value("${"+PRE+"initialSize}")    private int initialSize;    @Value("${"+PRE+"maxActive}")    private int maxActive;    @Value("${"+PRE+"minIdle}")    private int minIdle;    @Value("${"+PRE+"maxWait}")    private long maxWait;    @Bean("mysqlDataSource")    public DruidDataSource mysqlDataSource(){        DruidDataSource druidDataSource = new DruidDataSource();        druidDataSource.setUrl(url);        druidDataSource.setUsername(username);        druidDataSource.setDriverClassName(driverClassName);        druidDataSource.setPassword(password);        druidDataSource.setInitialSize(initialSize);        druidDataSource.setMinIdle(minIdle);        druidDataSource.setMaxActive(maxActive);        druidDataSource.setMaxWait(maxWait);        return druidDataSource;    }    @Bean("mysqlSqlSessionFactory")    public SqlSessionFactory mysqlSqlSessionFactory() throws Exception {        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();        sqlSessionFactoryBean.setDataSource(mysqlDataSource());        //使用xml的方式，如果不配置会一直找不到sql        //默认使用注解的方式        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()                .getResources("classpath:mapper/*.xml"));        return sqlSessionFactoryBean.getObject();    }    @Bean("mysqlSqlSessionTemplate")    public SqlSessionTemplate mysqlSqlSessionTemplate()throws Exception{        return new SqlSessionTemplate(mysqlSqlSessionFactory());    }    @Bean    public ServletRegistrationBean druidServlet() {        ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");        //控制台管理用户，加入下面2行 进入druid后台就需要登录        //servletRegistrationBean.addInitParameter("loginUsername", "admin");        //servletRegistrationBean.addInitParameter("loginPassword", "admin");        return servletRegistrationBean;    }    @Bean    public FilterRegistrationBean filterRegistrationBean() {        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();        filterRegistrationBean.setFilter(new WebStatFilter());        filterRegistrationBean.addUrlPatterns("/*");        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");        filterRegistrationBean.addInitParameter("profileEnable", "true");        return filterRegistrationBean;    }    @Bean    public StatFilter statFilter(){        StatFilter statFilter = new StatFilter();        statFilter.setLogSlowSql(true); //slowSqlMillis用来配置SQL慢的标准，执行时间超过slowSqlMillis的就是慢。        statFilter.setMergeSql(true); //SQL合并配置        statFilter.setSlowSqlMillis(1000);//slowSqlMillis的缺省值为3000，也就是3秒。        return statFilter;    }    @Bean    public WallFilter wallFilter(){        WallFilter wallFilter = new WallFilter();        //允许执行多条SQL        WallConfig config = new WallConfig();        config.setMultiStatementAllow(true);        wallFilter.setConfig(config);        return wallFilter;    }}

这里有个坑：找不到xml中的sql 。

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.test.page.dao.UserDao.findById 。

出现上面问题的原因有很多.

例如:

1：检查xml文件所在package名称是否和Mapper interface所在的包名一一对应； 。

2：检查xml的namespace是否和xml文件的package名称一一对应； 。

3：检查方法名称是否对应； 。

如果不是上面这几种问题:

在配置类中添加setMapperLocations(),并且指定xml的位置 。

@Bean("mysqlSqlSessionFactory")    public SqlSessionFactory mysqlSqlSessionFactory() throws Exception {        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();        sqlSessionFactoryBean.setDataSource(mysqlDataSource());        //使用xml的方式，如果不配置会一直找不到sql        //默认使用注解的方式        sqlSessionFactoryBean.setMapperLocations(new PathMatchingResourcePatternResolver()                .getResources("classpath:mapper/*.xml"));        return sqlSessionFactoryBean.getObject();    }

springboot整合alibaba/druid

一，用快速建立建立spring boot项目

解决springboot整合druid遇到的坑

springboot 版本号为1.5.12和选择相对应的工具（如版本不一致会导致运行错误） 。

解决springboot整合druid遇到的坑

pom.xml中添加 。

<!-- https://mvnrepository.com/artifact/com.alibaba/druid --><dependency>   <groupId>com.alibaba</groupId>   <artifactId>druid</artifactId>   <version>1.1.9</version></dependency><dependency>   <groupId>mysql</groupId>   <artifactId>mysql-connector-java</artifactId>   <scope>runtime</scope></dependency>

二 添加yml文件

解决springboot整合druid遇到的坑

spring:  datasource:    username: root    password: 123456    url: jdbc:mysql://localhost:3306/dept?useUnicode=true&characterEncoding=UTF-8&zeroDateTimeBehavior=convertToNull    driver-class-name: com.mysql.jdbc.Driver    type: com.alibaba.druid.pool.DruidDataSource#   数据源其他配置    initialSize: 5    minIdle: 5    maxActive: 20    maxWait: 60000    timeBetweenEvictionRunsMillis: 60000    minEvictableIdleTimeMillis: 300000    validationQuery: SELECT 1 FROM DUAL    testWhileIdle: true    testOnBorrow: false    testOnReturn: false    poolPreparedStatements: true#   配置监控统计拦截的filters，去掉后监控界面sql无法统计，"wall"用于防火墙    filters: stat,wall,log4j    maxPoolPreparedStatementPerConnectionSize: 20    useGlobalDataSourceStat: true    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

  。

三 建立config包

3.1 建立dataSourcesConfig类 。

package cn.vp.config;import com.alibaba.druid.pool.DruidDataSource;import com.alibaba.druid.support.http.StatViewServlet;import com.alibaba.druid.support.http.WebStatFilter;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.boot.web.servlet.FilterRegistrationBean;import org.springframework.boot.web.servlet.ServletRegistrationBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import javax.sql.DataSource;import java.util.Arrays;import java.util.HashMap;import java.util.Map;@Configurationpublic class DataSourcesConfig {    @Bean    @ConfigurationProperties(prefix = "spring.datasource")    public DataSource getDataSources() {        return new DruidDataSource();    }    /**     * 配置druid后台管理的servlet     *     * @return     */    @Bean    public ServletRegistrationBean druidServlet() {        ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");        Map<String, String> initParams = new HashMap<>();        initParams.put("loginUsername", "admin");        initParams.put("loginPassword", "admin");        initParams.put("allow", "");//默认就是允许所有访问        initParams.put("deny", "192.168.15.21");//禁止访问的ip        bean.setInitParameters(initParams);        return bean;    }    /**     * 配置druid后台管理的filter     *     * @return     */    @Bean    public FilterRegistrationBean druidFilter() {        FilterRegistrationBean bean = new FilterRegistrationBean();        bean.setFilter(new WebStatFilter());        Map<String, String> initParams = new HashMap<>();        //设置不拦截的路径  *.cs *.js    /druid/*        initParams.put("exclusions","*.js,*.css,/druid/*");        bean.setInitParameters(initParams);        //设置filter拦截 那些请求        bean.setUrlPatterns(Arrays.asList("/*"));        return bean;    }}

3.2 建立MybatisConfig类 。

package cn.vp.config;import org.mybatis.spring.boot.autoconfigure.ConfigurationCustomizer;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class MyBatisConfig {    @Bean    public ConfigurationCustomizer configurationCustomizer() {        return new ConfigurationCustomizer() {            @Override            public void customize(org.apache.ibatis.session.Configuration configuration) {                //-自动使用驼峰命名属性映射字段   userId    user_id                configuration.setMapUnderscoreToCamelCase(true);                //使用列别名替换列名 select user as User                configuration.setUseColumnLabel(true);            }        };    }}

四，dao层的建立

package cn.vp.dao;import cn.vp.entity.Department;import org.apache.ibatis.annotations.*;@Mapperpublic interface DepartmentDao {    @Insert("INSERT INTO `Department` (`departmentName`) VALUES (#{departmentName})")    public int addDepartment(Department department);    @Delete("DELETE FROM  department where id=#{id}")    public int deleteById(Integer id);    @Update("UPDATE `Department` SET `departmentName`=#{departmentName} WHERE (`id`=#{id})")    public int updateDepartment(Department department);    @Select("SELECT  * from department where id=#{id}")    public Department queryById(@Param("id") Integer id);}

以上为个人经验，希望能给大家一个参考，也希望大家多多支持我.

原文链接：https://blog.csdn.net/weixin_43845184/article/details/103179659 。

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