spring boot实战
程序员文章站
2022-05-09 08:15:39
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接着初探篇,继续深入,解决自定义过滤器、监听器、拦截器这些常用编码。先来看看项目结构:
实现上面所说的问题前,先来个简单的数据库操作。这里用的orm框架是mybatis:
1.在application.properties编码数据库连接参数(application.properties是spring boot默认的资源文件)
jdbc.driverClassName=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8 jdbc.username=root jdbc.password=123456
2.编码数据库连接池,用的是HikariCP(在默认的资源文件下配置的参数可通过@Value("${keyName}")这种方式获取值)
@Configuration @MapperScan(basePackages = "com.tboot.mapper", sqlSessionFactoryRef = "sqlSessionFactory") public class DataSourceConfig { @Value("${jdbc.url}") private String url; @Value("${jdbc.username}") private String user; @Value("${jdbc.password}") private String password; @Value("${jdbc.driverClassName}") private String driverClass; @Bean(name = "dataSource",destroyMethod = "close") //标志这个 Bean 如果在多个同类 Bean 候选时,该 Bean 优先被考虑。「多数据源配置的时候注意,必须要有一个主数据源,用 @Primary 标志该 Bean @Primary public DataSource dataSource() { HikariDataSource dataSource = new HikariDataSource(); dataSource.setDriverClassName(driverClass); dataSource.setJdbcUrl(url); dataSource.setUsername(user); dataSource.setPassword(password); dataSource.setConnectionTimeout(30000); //一个连接idle状态的最大时长(毫秒),超时则被释放(retired),缺省:10分钟 dataSource.setIdleTimeout(60000); //一个连接的生命时长(毫秒),超时而且没被使用则被释放(retired),缺省:30分钟,建议设置比数据库超时时长少30秒,参考MySQL wait_timeout参数(show variables like '%timeout%';) dataSource.setMaxLifetime(600000); //连接池中允许的最大连接数。缺省值:10;推荐的公式:((core_count * 2) + effective_spindle_count) dataSource.setMaximumPoolSize(15); return dataSource; } @Bean(name = "transactionManager") @Primary @Qualifier("tm1") public DataSourceTransactionManager transactionManager() { return new DataSourceTransactionManager(dataSource()); } @Bean(name = "sqlSessionFactory") @Primary public SqlSessionFactory sqlSessionFactory(@Qualifier("dataSource") DataSource dataSource) throws Exception { final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean(); sessionFactory.setDataSource(dataSource); sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver() .getResources("classpath:mapping/*.xml")); return sessionFactory.getObject(); } }
3.创建model、mapper和编码sql
public class User { private Integer id; private String name; private String password; private Boolean state; private String email; private Date createtime; private Boolean deleted; …… }
public interface UserMapper { int deleteByPrimaryKey(Integer id); int insert(User record); int insertSelective(User record); User selectByPrimaryKey(Integer id); int updateByPrimaryKeySelective(User record); int updateByPrimaryKey(User record); User selectByPassword(@Param("name")String name, @Param("password")String password); }
具体的sql就不贴了,太占篇幅。
4.编码Controller和视图(用的是Freemarker)
@RestController //@RestController相当于@Controller+@ResponseBody @RequestMapping("/test") public class HelloController { @Resource private UserMapper userMapper; @RequestMapping(value = "/view") public ModelAndView view(int id) { ModelAndView mv = new ModelAndView("backweb/view"); mv.addObject("user", userMapper.selectByPrimaryKey(id)); return mv; } }
<!DOCTYPE html> <html> <head> <title>view</title> </head> <body> <div>${user.name }---${user.email}</div> </body> </html>
这样数据库操作方面就告一段落。
接下来回归正题,等来实现自定义拦截器,篇幅太长,这里只贴出关键代码,整个项目代码可下载附件。
1.编码登录拦截器
public class LoginInterceptor extends HandlerInterceptorAdapter { private static Logger logger = Logger.getLogger(LoginInterceptor.class.getName()); @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { //业务代码 return super.preHandle(request, response, handler); } }
2.编码Config,将拦截器添加到Config中
@Configuration public class MyConfig extends WebMvcConfigurerAdapter { @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/manage/**").excludePathPatterns("/manage/login"); //registry.addInterceptor(new AuthInterceptor()).addPathPatterns("/manage/**") //.excludePathPatterns("/manage/login","/manage/index","/manage/menu","/manage/sysExit"); } }
自定义拦截器的关键代码就这些。
紧接着实现自定义过滤器:
@Order(1) //执行过滤顺序,值越小,越先执行 @WebFilter(filterName = "requestSessionFilter", urlPatterns = "/*") public class RequestSessionFilter implements Filter { private static Logger logger = Logger.getLogger(RequestSessionFilter.class.getName()); @Override public void destroy() { } @Override public void doFilter(ServletRequest request, ServletResponse response,FilterChain fchain) throws IOException, ServletException { //业务代码 } @Override public void init(FilterConfig arg0) throws ServletException { } }
在初探篇中,Run.java类上面已加了个@ServletComponentScan注解,它的作用就是可以直接通过@WebServlet、@WebFilter、@WebListener注解自动注册Servlet、Filter、Listener。
很遗憾这项目中并没有实现监听器和servlet,往后有时间再补吧……
还有多数据源配置是实现了的,自己下载项目看吧,这里就不多说了……
补上项目sql脚本:
CREATE TABLE IF NOT EXISTS `t_function` ( `ID` int(11) NOT NULL AUTO_INCREMENT, `Name` varchar(50) DEFAULT NULL, `Authurl` varchar(100) DEFAULT NULL, `Url` varchar(100) DEFAULT NULL, `ParentID` int(11) DEFAULT NULL, `Sort` int(11) DEFAULT NULL, `Deleted` bit(1) DEFAULT b'0', PRIMARY KEY (`ID`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; CREATE TABLE IF NOT EXISTS `t_role` ( `ID` int(11) NOT NULL AUTO_INCREMENT, `Name` varchar(50) DEFAULT NULL, `Remark` varchar(50) DEFAULT NULL, `Deleted` bit(1) DEFAULT b'0', PRIMARY KEY (`ID`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; CREATE TABLE IF NOT EXISTS `t_role_function` ( `ID` int(11) NOT NULL AUTO_INCREMENT, `RoleID` int(11) DEFAULT NULL, `FunctionID` int(11) DEFAULT NULL, PRIMARY KEY (`ID`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; CREATE TABLE IF NOT EXISTS `t_user` ( `ID` int(11) NOT NULL AUTO_INCREMENT, `Name` varchar(50) DEFAULT NULL, `Password` varchar(50) DEFAULT NULL, `State` bit(1) DEFAULT b'0', `Email` varchar(150) DEFAULT NULL, `CreateTime` date DEFAULT NULL, `Deleted` bit(1) DEFAULT b'0', PRIMARY KEY (`ID`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; CREATE TABLE IF NOT EXISTS `t_user_role` ( `ID` int(11) NOT NULL AUTO_INCREMENT, `UserID` int(11) DEFAULT NULL, `RoleID` int(11) DEFAULT NULL, PRIMARY KEY (`ID`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
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