SpringBoot Java

SpringBoot采坑日记

SpringBoot

Posted by Twany on June 18, 2019

SpringBoot采坑指南

没耐心学ssh，ssm，只是粗略的过了一遍。很早就听闻了springboot的强大，今日，终于迎来了实战

prom.xml配置

springboot自带dependency：

1
2
3
4
5
6
7
8
9
10

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter</artifactId>
</dependency>

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>

此处配置我们需要用到的依赖

  • spring-web（springmvc用到）
1
2
3
4
5

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
</dependency>
  • thymeleaf
1
2
3
4
5

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

静态文件目录结构

静态文件目录结构

thymeleaf语法的应用

thymeleaf提供 StringUtils 工具集，有点好用

Controller使用

  • springboot提供 @PostMapping(value = “) 等方式代替 @Mapping

springMVC

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

//@EnableWebMvc 完全接管
@Configuration
public class MyMvcConfig implements WebMvcConfigurer {
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("login");
    }

    @Bean
    public WebMvcConfigurer webMvcConfigurer(){
        WebMvcConfigurer config = new WebMvcConfigurer() {
            @Override
            public void addViewControllers(ViewControllerRegistry registry) {
                registry.addViewController("/").setViewName("login");
                registry.addViewController("/index.html").setViewName("login");
                registry.addViewController("/user/login").setViewName("login");
                registry.addViewController("/main.html").setViewName("dashboard");
            }

            //注册拦截器
            @Override
            public void addInterceptors(InterceptorRegistry registry) {
                //已经做好了静态界面拦截
                registry.addInterceptor(new LoginHandlerInterceptor())
                        .addPathPatterns("/**")
                        .excludePathPatterns("/index.html","/","/user/login","/asserts/**"); //还需要放行静态文件
            }
        };

        return config;
    }
}

拦截器

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

//登录状态拦截器
public class LoginHandlerInterceptor implements HandlerInterceptor{
    //目标方法执行之前
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Object user = request.getSession().getAttribute("loginUser");
        if (user == null){
            //未登录
            request.setAttribute("msg","没有权限请先登录");
            request.getRequestDispatcher("/").forward(request,response);
            return false;
        }else{
            //已登录
            return true;
        }

    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable ModelAndView modelAndView) throws Exception {

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, @Nullable Exception ex) throws Exception {

    }
}