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在成員上加JsonIgnore宏來在返回的json中忽略某個成員

@RestController = @Controller + @ResponseBody

ctrl+shift+o清空所有的多余的包

ResponseBody表示返回的對象是一個json字符串

在eclipse中導入已存在的maven項目即可

start.spring.io生成SpringBoot的demo

SpringBoot使用場景

SpringBoot官方網(wǎng)址：start.spring.io

項目地址:

https://github.com/leechenxiang/imooc-springboot-starter?

https://github.com/leechenxiang/imooc-springboot-starter

@Configration配置攔截器

繼承WebMvcConfigurerAdapter

重寫addInterceptors

@Configuration
public?class?WebMvcConfigurer?extends?WebMvcConfigurerAdapter?{
????@Override
????public?void?addInterceptors(InterceptorRegistry?registry)?{
????????registry.addInterceptor(new?OneInterceptor()).addPathPatterns("/one/**");
????????super.addInterceptors(registry);
????}
}

public?class?OneInterceptor?implements?HandlerInterceptor?{
????@Override//請求處理之前,Controller方法調(diào)用之前
????public?boolean?preHandle(HttpServletRequest?request,?HttpServletResponse?response,?Object?handler)?throws?Exception?{
????????//System.out.println("被one攔截，放行。。。");
????????//return?true;
????????System.out.println("不放行！??！");
????????returnError(response,"不放行");
????????return?false;
????}

@Override//請求處理之后，視圖渲染之前。controller調(diào)用之后
public?void?postHandle(HttpServletRequest?request,?HttpServletResponse?response,?Object?handler,?ModelAndView?modelAndView)

@Override//請求結(jié)束之后，視圖渲染之后，用于清理資源
public?void?afterCompletion(HttpServletRequest?request,?HttpServletResponse?response,?Object?handler,?Exception?ex)

public?void?returnError(HttpServletResponse?response,String?result)?throws?Exception?{
????OutputStream?out=null;
????try?{
????????response.setCharacterEncoding("utf-8");
????????response.setContentType("text/json");
????????out=response.getOutputStream();
????????out.write(result.getBytes("utf-8"));
????????out.flush();
????}finally?{
????????if(out!=null){
????????????out.close();
????????}
????}
}

60%

@EnableAsync開啟異步

@Component注解類，@Async注解方法

Thread.sleep(1000);//當前線程睡眠1秒

返回：

Future<Boolean>

return?new?AsyncResult<>(true);

執(zhí)行：

Future<Boolean>?a=?asyncTask.doTask11();

a.isDone();//true-任務(wù)已完成

應(yīng)用：發(fā)短信、郵件、app消息推送、凌晨任務(wù)

60%

任務(wù)上加@Scheduled

fixedRate=3000：每隔3秒

cron表達式（六位數(shù)）

表達式生成地址：cron.qqe2.com

80%

@EnableScheduling開啟定時任務(wù)

90%