Springboot進階-JDBC、Druid、Mybatis、Swagger、SpringMVC、Mail
阿新 • • 發佈：2021-09-06
1.Springboot-JDBC
-
Springboot整合JDBC後，引入spring-boot-starter-jdbc，通過JdbcTemplate來操作資料庫。
-
匯入依賴
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency>
- 通過JdbcTemplate來操作資料庫，進行增刪改查
@RestControllerpublicclassUserController{
@ResourceprivateJdbcTemplatejdbcTemplate;
//fromfhadmin.cn
@GetMapping("/delete")publicStringdelete(){
Stringsql="deletefromtb_userwhereid=9";
jdbcTemplate.update(sql);return"deleteok";
}
@GetMapping("/update")publicStringupdate(){
Stringsql="updatetb_usersetname='tom9'whereid=9";
jdbcTemplate.update(sql);return"updateok";
}
@GetMapping("/insert")publicStringinsert(){
Stringsql="insertintotb_user(id,name,age)values(10,'tom10',10)";
jdbcTemplate.update(sql);return"insertok";
}
@GetMapping("/get")publicList<Map<String,Object>>getList(){
Stringsql="select*fromtb_user";
List<Map<String,Object>>list=jdbcTemplate.queryForList(sql);returnlist;
}
}2.Springboot-Druid
- 匯入依賴
<!-- <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.2.6</version> </dependency> <!--druid需要輸出日誌fromfhadmin.cn--> <!-- <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency>
- application.yaml配置Druid連線池
spring: datasource: driver-class-name:com.mysql.cj.jdbc.Driver url:jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=UTF8&useSSL=false&serverTimezone=Asia/Shanghai username:root password:123456 type:com.alibaba.druid.pool.DruidDataSource #SpringBoot預設是不注入這些屬性值的，需要通過DruidDataSource繫結 #druid資料來源專有配置 initialSize:5 minIdle:5 maxActive:20 maxWait:60000 timeBetweenEvictionRunsMillis:60000 minEvictableIdleTimeMillis:300000 validationQuery:SELECT1FROMDUAL testWhileIdle:true testOnBorrow:false testOnReturn:false poolPreparedStatements:true #配置監控統計攔截的filters，stat:監控統計、log4j：日誌記錄、wall：防禦sql注入 #如果允許時報錯java.lang.ClassNotFoundException:org.apache.log4j.Priority #則匯入log4j依賴即可，Maven地址： filters:stat,wall,log4j maxPoolPreparedStatementPerConnectionSize:20 useGlobalDataSourceStat:true connectionProperties:druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
- yaml中Druid連線池配置和DruidDataSource繫結
@ConfigurationpublicclassDruidConfiguration{
/**
*yaml中druid其他配置預設是不會匯入的，需要建立DruidDataSource時載入
*@return
*/
@Bean
@ConfigurationProperties(prefix="spring.datasource")publicDataSourcedataSource(){returnnewDruidDataSource();
}
}
- 配置訪問Druid的Servler
@ConfigurationpublicclassDruidConfiguration{
/**
*配置Druid訪問的Serlvet
*Springboot專案沒有web.xml配置，servlet和filter可以通過
*ServletRegistrationBean和FilterRegistrationBean加入到容器中。
*@return
*/
@BeanpublicServletRegistrationBean<StatViewServlet>statViewServlet(){
ServletRegistrationBean<StatViewServlet>registrationBean=newServletRegistrationBean<>();
//將StatViewServlet加入
registrationBean.setServlet(newStatViewServlet());
//配置訪問的路徑，druid的後臺訪問路徑
registrationBean.setUrlMappings(Arrays.asList("/druid/*"));
//這些引數可以在com.alibaba.druid.support.http.StatViewServlet
//的父類com.alibaba.druid.support.http.ResourceServlet中找到
//druid訪問登入密碼
Map<String,String>map=newHashMap<>();
map.put("loginUsername","root");
map.put("loginPassword","123456");
//只有本機可以訪問
//當配置是localhost時會出錯java.lang.IllegalArgumentException:InvalidIPAddress[localhost]
//可以配置為map.put("allow","127.1.0.0");
//map.put("allow","localhost");
map.put("allow","127.1.0.0");
//allow=""，誰都可以訪問
//map.put("allow","");
//禁止訪問
map.put("tom","192.168.133.125");
registrationBean.setInitParameters(map);returnregistrationBean;
}
}
- 配置Druid監控的Filter
@ConfigurationpublicclassDruidConfiguration{
/**
*配置Druid監控的Filter
*Springboot專案沒有web.xml配置，servlet和filter可以通過
*ServletRegistrationBean和FilterRegistrationBean加入到容器中。
*@return
*/
@BeanpublicFilterRegistrationBean<WebStatFilter>webStatFilter(){
FilterRegistrationBean<WebStatFilter>registrationBean=newFilterRegistrationBean<>();
registrationBean.setFilter(newWebStatFilter());
/*
<filter>
<filter-name>DruidWebStatFilter</filter-name>
<filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
<init-param>
<param-name>exclusions</param-name>
<param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>DruidWebStatFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
*/
//配置結果相等於web.xml中的如上配置
Map<String,String>map=newHashMap<>();
//過濾的資源，過濾的資源，WebStatFilter不會對這些資源進行監控。
map.put("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
//過濾所有的請求。WebStatFilter會監控這個請求。並且展示在druid的web應用下。
registrationBean.setUrlPatterns(Arrays.asList("/*"));
registrationBean.setInitParameters(map);returnregistrationBean;
}
}
3.Springboot-Mybatis
- 匯入依賴
<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.2.0</version> </dependency>
- mapper.xml存放位置
mybatis: #別名包 type-aliases-package:com.my.springboot.pojo #mapper.xml的位置 mapper-locations:classpath:/mapper/*.xml
-
配置dao層介面的兩種方式
- 使用@Mapper註解
@Mapper @RepositorypublicinterfaceUserDao{ List<User>getList(); }- 啟動類上通過@MapperScans配置
@SpringBootApplication @MapperScans({ @MapperScan("com.my.springboot.dao") })publicclassDemo05Application{publicstaticvoidmain(String[]args){ SpringApplication.run(Demo05Application.class,args); } }
4.Springboot-Swagger
- 匯入依賴
<!--3.0和springboot整合，直接匯入starter--> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-boot-starter</artifactId> <version>3.0.0</version> </dependency>
- 配置
@Configuration
//開啟Swagger
//fromfhadmin.cn
@EnableSwagger2publicclassSwaggerConfig{
/**
*構建Swagger配置
*@paramenvironment
*@return
*/
@BeanpublicDocketdocket(Environmentenvironment){returnnewDocket(DocumentationType.OAS_30)
.apiInfo(apiInfo())
.select()
//配置要掃描的包
.apis(RequestHandlerSelectors.basePackage("com.my.springboot"))
//過濾請求只掃描/index有關的請求
//.paths(PathSelectors.ant("/index"))
.build();
}
/**
*配置swagger頁面顯示
*@return
*/privateApiInfoapiInfo(){
Contactcontact=newContact("tom",");returnnewApiInfo(
//title
"swagger2練習",
//description
"swagger2整個Springboot練習",
//version
"1.0",
//網站訪問路徑
"
//個人資訊
contact,
//license
"Apache2.0",
//licenseUrl
"());
}
}
- Swagger訪問地址。
。 - 配置只在swagger在dev和test環境可以訪問
//fromfhadmin.cn
@Configuration
@EnableSwagger2publicclassSwaggerConfig{
@BeanpublicDocketdocket(Environmentenvironment){
Profilesprofiles=Profiles.of("dev","test");
//dev和test環境返回true，可以使用swagger
//prod環境返回false，不適用swaggerbooleanflag=environment.acceptsProfiles(profiles);returnnewDocket(DocumentationType.OAS_30)
.apiInfo(apiInfo())
//配置是否啟用swagger
.enable(flag)
.select()
//配置要掃描的包
.apis(RequestHandlerSelectors.basePackage("com.my.springboot"))
.build();
}
}
- Swagger配置分組
//fromfhadmin.cn
@Configuration
@EnableSwagger2publicclassSwaggerConfig{
/**
*配置多個分組，就建立多個Docket物件，設定不同的gruopName()。
*@return
*/
@BeanpublicDocketdocker1(){returnnewDocket(DocumentationType.OAS_30).groupName("bob");
}
@BeanpublicDocketdocker2(){returnnewDocket(DocumentationType.OAS_30).groupName("tom");
}
}
- Swagger註解
//實體類不會被掃描到，需要掃描到的介面，返回實體類物件，才能被Swagger配置fromfhadmin.cn
@Data
@ApiModel(value="使用者",description="使用者類")publicclassUser{
@ApiModelProperty(value="id")privateIntegerid;
@ApiModelProperty(value="name")privateStringname;
@ApiModelProperty(value="age")privateIntegerage;
}
@RestController
@Api(tags={"控制使用者url"},produces="application/json")publicclassUserController{
//方法說明
@ApiOperation("獲取一個使用者")
//引數說明
@ApiImplicitParams({
@ApiImplicitParam(name="使用者名稱",defaultValue="tom",required=true)
})
@GetMapping("/user")publicStringuser(){return"user";
}
}
5.Springboot-SpringMVC
- 將web.xml中的Servlet和Filter配置到容器中。
@ConfigurationpublicclassDruidConfiguration{
/**fromfhadmin.cn
*配置Druid訪問的Serlvet
*Springboot專案沒有web.xml配置，servlet和filter可以通過
*ServletRegistrationBean和FilterRegistrationBean加入到容器中。
*@return
*/
@BeanpublicServletRegistrationBean<StatViewServlet>statViewServlet(){
ServletRegistrationBean<StatViewServlet>registrationBean=newServletRegistrationBean<>();
//將StatViewServlet加入
registrationBean.setServlet(newStatViewServlet());
//配置訪問的路徑，druid的後臺訪問路徑
registrationBean.setUrlMappings(Arrays.asList("/druid/*"));
//這些引數可以在com.alibaba.druid.support.http.StatViewServlet
//的父類com.alibaba.druid.support.http.ResourceServlet中找到
//druid訪問登入密碼
Map<String,String>map=newHashMap<>();
map.put("loginUsername","root");
map.put("loginPassword","123456");
//只有本機可以訪問
//當配置是localhost時會出錯java.lang.IllegalArgumentException:InvalidIPAddress[localhost]
//可以配置為map.put("allow","127.1.0.0");
//map.put("allow","localhost");
map.put("allow","127.1.0.0");
//allow=""，誰都可以訪問
//map.put("allow","");
//禁止訪問
map.put("tom","192.168.133.125");
registrationBean.setInitParameters(map);returnregistrationBean;
}
/**fromfhadmin.cn
*配置Druid監控的Filter
*Springboot專案沒有web.xml配置，servlet和filter可以通過
*ServletRegistrationBean和FilterRegistrationBean加入到容器中。
*@return
*/
@BeanpublicFilterRegistrationBean<WebStatFilter>webStatFilter(){
FilterRegistrationBean<WebStatFilter>registrationBean=newFilterRegistrationBean<>();
registrationBean.setFilter(newWebStatFilter());
/*
<filter>
<filter-name>DruidWebStatFilter</filter-name>
<filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
<init-param>
<param-name>exclusions</param-name>
<param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>DruidWebStatFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
*/
//配置結果相等於web.xml中的如上配置
Map<String,String>map=newHashMap<>();
//過濾的資源，過濾的資源，WebStatFilter不會對這些資源進行監控。
map.put("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
//過濾所有的請求。WebStatFilter會監控這個請求。並且展示在druid的web應用下。
registrationBean.setUrlPatterns(Arrays.asList("/*"));
registrationBean.setInitParameters(map);returnregistrationBean;
}
}
-
配置檢視解析器
- 方式一
@ConfigurationpublicclassMyWebMvcConfigurerimplementsWebMvcConfigurer{ /**fromfhadmin.cn *自定義檢視解析器方式一 *@return */ @BeanpublicViewResolverviewResolver(){returnnewMyViewResolver(); }publicstaticclassMyViewResolverimplementsViewResolver{ @OverridepublicViewresolveViewName(StringviewName,Localelocale)throwsException{returnnull; } } }- 方式二
publicclassMyWebMvcConfigurerimplementsWebMvcConfigurer{ /**fromfhadmin.cn *自定義檢視解析器方法二 *@paramregistry */ @OverridepublicvoidconfigureViewResolvers(ViewResolverRegistryregistry){ registry.viewResolver(newMyViewResolver()); }eturnnewMyViewResolver(); }publicstaticclassMyViewResolverimplementsViewResolver{ @OverridepublicViewresolveViewName(StringviewName,Localelocale)throwsException{returnnull; } } } -
其他配置
@Configuration
//@EnableWebMvc//讓springboot自動配置失效fromfhadmin.cnpublicclassMyWebMvcConfigurerimplementsWebMvcConfigurer{
@OverridepublicvoidaddViewControllers(ViewControllerRegistryregistry){
//當URL訪問/hello時，跳轉到templates/index.html
registry.addViewController("/hello").setViewName("index");
}
}
- 異常處理
@ControllerAdvice
@Slf4jpublicclassControllerExceptionHandler{
@ExceptionHandler(Exception.class)publicModelAndViewhandlerException(HttpServletRequestrequest,Exceptione)throwsException{
log.error("requesturl{},errorinfo{}",request.getRequestURL(),e);
//如果捕獲到的異常上有ResponseStatus註解，說明是頁面找不到的異常，這裡直接丟擲，
//交給springboot去處理，來返回error/404.html。if(AnnotationUtils.findAnnotation(e.getClass(),ResponseStatus.class)!=null){throwe;
}
ModelAndViewmv=newModelAndView();
mv.addObject("url",request.getRequestURL());
mv.addObject("exception",e);
mv.setViewName("error/error.html");returnmv;
}
}