1.SpringBoot是Spring的简化2.SpringMVC用于处理浏览器的请求3.MyBatis用来访问数据库4.Redis用作缓存5.Kafka用作消息队列6.Elasticsearch用作全文搜索7.SpringSecurity可以管理系统权限8.SpringActuator用作系统上线后的状态监控
随时记：server.port=80//设置访问端口号server.servlet.context-path=/community//设置默认路径三、Spring入门1.SpringFramework
2.SpringIoC
此类其实是一个配置类
packagecom.hsw.community;importorg.springframework.boot.SpringApplication;importorg.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublicclassCommunityApplication{publicstaticvoidmain(String[]args){SpringApplication.run(CommunityApplication.class,args);}}如何使用spring容器？
@SpringBootTest@ContextConfiguration(classes=CommunityApplication.class)//使用配置类//实现ApplicationContaxtAware接口并实现相应方法即可从参数中获取ApplicationContextclassCommunityApplicationTestsimplementsApplicationContextAware{privateApplicationContextapplicationContext;@OverridepublicvoidsetApplicationContext(ApplicationContextapplicationContext)throwsBeansException{this.applicationContext=applicationContext;}@TestpublicvoidtestApplication(){System.out.println(applicationContext);//常用方法applicationContext.getBean(Dao.class);applicationContext.getBean("mybatisDao",Dao.class);}}随时记/**使用场景比如我们有Dao接口下有两个实现类hibernateDao和mybatisDao*我们用applicationContext获取bean时希望获取mybatisDao则加入此注解即可*/@Primary@Repority("mybatisDao")//自定义bean的名字@PostConstruct//在构造器之后调用@PreDestroy//销毁之前调用@Scope("prototype")//spring默认的bean都是单例的加此注解会在每次getBean方法调用时实例化对象在配置类中配置要使用的bean(很笨拙的方法)
@ConfigurationpublicclassAlphaConfig{@BeanpublicSimpleDateFormatsimpleDateFormat(){returnnewSimpleDateFormat("yyyy-MM-dd");}}随时记@bean//bean的名称就是方法名如上simpleDateFormat@Autowired//依赖注入，获取bean@Qualifier("xxx")//把名字为xxx的bean注入，一般和Autowired一起使用四、SpringMVC入门SpringMVC
Thymeleaf
随时记spring.thymeleaf.cache=false//开发中关闭thymeleaf的缓存，上线后开启//Thymeleaf配置类，实际配置过程就是给某个bean设置属性@EnableConfigurationProperties(ThymeleafProperties.class)publicclassThymeleafAutoConfiguration@ConfigurationProperties(prefix="spring.thymeleaf")publicclassThymeleafProperties{简单举几个例子1.mvc
@Controller@RequestMapping("/demo")publicclassAlphaController{@RequestMapping("/test")publicvoiddemo(HttpServletRequestrequest,HttpServletResponseresponse){System.out.println(request.getContextPath());System.out.println(request.getMethod());Enumeration
@RequestMapping(path="/testRequestParam",method=RequestMethod.GET)@ResponseBody///testRequestParami=10&j=100publicStringtestRequestParam(@RequestParam(name="i",required=false,defaultValue="1")inti,@RequestParam(name="j",required=false,defaultValue="100")intj){System.out.println(i);System.out.println(j);return"helloworld";}3.快速获取路径中的值
@RequestMapping(path="/testPathVariable/{id}",method=RequestMethod.GET)@ResponseBody///testPathVariable/123publicStringtestPathVariable(@PathVariable("id")intid){System.out.println(id);//123return"helloworld";}随时记：@RequestParam//经过DispatcherServlet处理后会从request对象中获取参数@PathVariable("xxx")//快速获取路径中的值如上所示4.表单中数据的获取
名字： 年龄：
@RequestMapping(path="/teacher",method=RequestMethod.GET)publicModelAndViewtestThymeleaf(){ModelAndViewmv=newModelAndView();mv.addObject("name","狂徒张三");mv.addObject("age","100");mv.setViewName("teacher.html");returnmv;}teacher.html位于templates下
@RequestMapping(path="/teacher",method=RequestMethod.GET)publicStringtestThymeleaf(Modelmodel){model.addAttribute("name","电棍");model.addAttribute("age","1000");return"teacher.html";}6.相应json数据（用于异步请求，java对象->json->js对象）
@RequestMapping(path="/testJson",method=RequestMethod.GET)@ResponseBodypublicMap
#DataSourcePropertiesspring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.url=jdbc:mysql://localhost:3306/communitycharacterEncoding=utf-8&useSSL=false&serverTimezone=Hongkongspring.datasource.username=rootspring.datasource.password=123456spring.datasource.type=com.zaxxer.hikari.HikariDataSourcespring.datasource.hikari.maximum-pool-size=15spring.datasource.hikari.minimum-idle=5spring.datasource.hikari.idle-timeout=30000#MybatisProperties#resources目录下新建一个mapper目录存放xml文件mybatis.mapper-locations=classpath:mapper/*.xmlmybatis.type-aliases-package=com.hsw.community.entity#启动自动设置主键mybatis.configuration.useGeneratedKeys=true#下划线命名方式和驼峰命名方式匹配如：header_url==headerUrlmybatis.configuration.mapUnderscoreToCamelCase=true创建entity包并创建User类
importjava.util.Date;publicclassUser{privateintid;privateStringusername;privateStringpassword;privateStringsalt;privateStringemail;privateinttype;privateintstatus;privateStringactivationCode;privateStringheaderUrl;privateDatecreateTime;在dao包下创建UserMapper接口
@Mapper@RepositorypublicinterfaceUserMapper{UserselectById(intid);UserselectByName(Stringusername);UserselectByEmail(Stringemail);intinsertUser(Useruser);intupdateStatus(intid,intstatus);intupdateHeader(intid,StringheaderUrl);intupdatePassword(intid,Stringpassword);}在mapper文件夹下建立user-mapper.xml文件
@SpringBootTest@ContextConfiguration(classes=CommunityApplication.class)publicclassMapperTest{@AutowiredprivateUserMapperuserMapper;@TestpublicvoidtestSelectUser(){Useruser=userMapper.selectById(101);System.out.println(user);}}遇到的问题：
最初在UserMapper接口上只是用了@Mapper注解也能跑但是idea总是提示找不到bean单独加@Repository其实也能跑这里把两个都写上去了其实没必要
随时记：因为mapper.xml文件中的sql语句写错很难被发现，为了排错可以设置日志级别为debug便于调错#loggerlogging.level.com.hsw.community=debug六、开发社区首页开发流程
社区首页
publicclassDiscussPost{privateintid;privateintuserId;privateStringtitle;privateStringcontent;//0-普通;1-置顶;privateinttype;//0-正常;1-精华;2-拉黑;privateintstatus;privateDatecreateTime;privateintcommentCount;privatedoublescore;}2.写对应dao
@RepositorypublicinterfaceDiscussPostMapper{/***@paramuserId考虑查看我的帖子的情况下设置动态sql，看mapper就知道了*@paramoffset*@paramlimit*@return*/List
2.服务端断点调试技巧
3.客户端断点调试技巧
packageorg.slf4j;publicinterfaceLogger{//我们可以在配置文件中启动不同的级别，则其以上级别日志可以显示低级别日志不会显示。//Printingmethods:publicvoidtrace(Stringmessage);publicvoiddebug(Stringmessage);publicvoidinfo(Stringmessage);publicvoidwarn(Stringmessage);publicvoiderror(Stringmessage);}写个测试类
packagecom.hsw.community;importorg.junit.jupiter.api.Test;importorg.slf4j.Logger;importorg.slf4j.LoggerFactory;importorg.springframework.boot.test.context.SpringBootTest;importorg.springframework.test.context.ContextConfiguration;@SpringBootTest@ContextConfiguration(classes=CommunityApplication.class)publicclassLoggerTest{privatestaticfinalLoggerlogger=LoggerFactory.getLogger(LoggerTest.class);@TestpublicvoidtestLogger1(){System.out.println(logger.getName());logger.trace("hellotrace");//程序调试日志logger.debug("hellodebug");//普通级别日志logger.info("helloinfo");logger.warn("hellowarn");//错误日志logger.error("hellolog");}}添加配置文件
#loggerlogging.level.com.hsw.community=debug输出结果
com.hsw.community.LoggerTest2020-05-0415:25:59.505DEBUG2644---[main]com.hsw.community.LoggerTest:hellodebug2020-05-0415:25:59.505INFO2644---[main]com.hsw.community.LoggerTest:helloinfo2020-05-0415:25:59.505WARN2644---[main]com.hsw.community.LoggerTest:hellowarn2020-05-0415:25:59.505ERROR2644---[main]com.hsw.community.LoggerTest:hellolog更改配置文件
logging.level.com.hsw.community=warn在此运行测试类查看输出结果
com.hsw.community.LoggerTest2020-05-0415:28:54.515WARN9020---[main]com.hsw.community.LoggerTest:hellowarn2020-05-0415:28:54.515ERROR9020---[main]com.hsw.community.LoggerTest:hellolog日志输出到文件中的配置
#文件都是以log结尾logging.file.name=d:work.log注意：这么搞有个问题，不同级别日志混杂不易查看且文件庞大。解决方法：使用配置文件配置（放到resource目录下）
$gitconfig--globaluser.name"hsw"$gitconfig--globaluser.emailhsw@hust.com12