SpringBoot入门笔记（二）IDEA下springboot项目spring+mybatis+sqlserver+log4j+简单登录验证拦截器的框架搭建

IDEA下springboot项目spring+mybatis+sqlserver+log4j+简单登录验证拦截器的框架搭建

先贴一个项目的目录结构

Attention：templates.html5是templates目录下新建了一个html5目录

1.项目创建

这个简单，选择jdk目录，填写项目信息，选择springboot版本，勾选一些需要的包依赖，基本上就是一直next，然后finish就好了，略过。。。

2.pom.xml

项目创建时，会将你选择的springboot包依赖加进去，我们需要的是加入一些创建时没有的依赖

2.1 数据库连接池--druid

关于druid数据库连接池的优点和性能就先不说，百度一下，你就知道

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.3</version>
        </dependency>

2.2 数据返回格式--JSONObject

        <dependency>
	    <groupId>com.alibaba</groupId>
	    <artifactId>fastjson</artifactId>
	    <version>1.1.36</version>
	</dependency>

2.3日志输出--log4j

        <!-- Log start -->
        <!-- spring boot start -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <exclusions>
                <!-- 排除自带的logback依赖 -->
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- springboot-log4j -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j</artifactId>
            <version>1.3.8.RELEASE</version>
        </dependency>
        <!-- Log end -->

引入log4j之前首先要排除springboot自带的logback依赖，在创建Spring Boot工程时，我们引入了spring-boot-starter，其中包含了spring-boot-starter-logging，该依赖内容就是Spring Boot默认的日志框架Logback。

附上一份log4j.properties的文件

#logger level
log4j.rootCategory=DEBUG,stdout,DebugAppender,InfoAppender,ErrorAppender
log4j.debug=true
log4j.appender.stdout=org.apache.log4j.ConsoleAppender  
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout     
log4j.appender.stdout.layout.ConversionPattern=[QC] %p [%t] %C.%M(%L) | %m%n
#logger input file
log4j.logger.DebugAppender.access=DEBUG
log4j.appender.DebugAppender=org.apache.log4j.DailyRollingFileAppender     
log4j.appender.DebugAppender.File=../logs/a.log
log4j.appender.DebugAppender.layout=org.apache.log4j.PatternLayout     
log4j.appender.DebugAppender.layout.ConversionPattern=%d-[TS] %p %t %c - %m%n     

#logger input file
log4j.logger.InfoAppender.access=INFO
log4j.appender.InfoAppender=org.apache.log4j.DailyRollingFileAppender     
log4j.appender.InfoAppender.File=../logs/b.log
log4j.appender.InfoAppender.layout=org.apache.log4j.PatternLayout     
log4j.appender.InfoAppender.layout.ConversionPattern=%d-[TS] %p %t %c - %m%n     

#error log input file
log4j.logger.ErrorAppender.access=ERROR
log4j.appender.ErrorAppender=org.apache.log4j.DailyRollingFileAppender
log4j.appender.ErrorAppender.File=../logs/c.log
log4j.appender.ErrorAppender.Append = true
log4j.appender.ErrorAppender.threshold = ERROR
log4j.appender.ErrorAppender.layout=org.apache.log4j.PatternLayout 
log4j.appender.ErrorAppender.layout.ConversionPattern=%d{MM-dd HH:mm:ss.SSS} %c %-5p - %m%n

pom.xml到这里就基本结束了，贴上一张log4j的日志打印图。

3.简单的登录验证拦截器

自定义一个登录验证拦截器LoginInterceptor，实现HandlerInterceptor接口

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3.1 LoginInterceptor.java

private static final Logger logger = LoggerFactory.getLogger(LoginInterceptor.class);

    //在目标方法执行前执行
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.err.println("------preHandle------");

        System.out.println("ContextPath" + request.getContextPath());
        System.out.println("getRequestURI" + request.getRequestURI());

        //获取session
        HttpSession session = request.getSession(true);
        //判断用户是否存在，不存在就跳转到登录页面
        if (session.getAttribute("username")==null){
            String uri = request.getRequestURI();
            System.out.println(uri);
            String url = request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/index";
            System.out.println(url);
            response.sendRedirect(request.getContextPath()+"/index");
            return false;
        }

        return true;
    }

    //在目标方法执行后执行，但在请求返回前，我们仍然可以对 ModelAndView进行修改
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    // 在请求已经返回之后执行
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }

3.2 登录配置类--LoginConfig.java

继承WebMvcConfigurerAdapter类，此类一定要记得加上@Configuration注解，否则无法生效

public LoginConfig() {
        super();
    }

    @Override
    public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
        configurer.enable();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //拦截规则：除了excludePathPatterns中地址，其他都拦截判断
        registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**").excludePathPatterns("/index");
        super.addInterceptors(registry);
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
        registry.addResourceHandler("/templates/**").addResourceLocations("classpath:/templates/");
        super.addResourceHandlers(registry);
    }

4.结语

大概就是这样，中间漏了一部分内容，等有空闲时补上。新手上路，多多指教。