Springboot问题总结学习

1.在springboot启动完成之后紧跟着启动一个线程。(不影响springboot初始化bean,以及主线程)

答:1.实现ApplicationRunner中的run方法。2.启动类加上@EnableAsync。3.然后通过异步的方式执行新线程。

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Component;

@Slf4j
@Component
public class OpenThreadTask implements ApplicationRunner {

    @Autowired
    private MyServerThread myServerThread;

    @Override
    @Async
    public void run(ApplicationArguments args) {
        myServerThread.run();
    }
}

2.在springboot初始化bean完成后,启动完成前紧跟着启动一个线程。(会影响springboot的rest服务和主线程)

答: 使用@PostContrust。@Construct --> @AutoWired --> @PostContrust

@Component
public class BeanA {

    @Autowired
    private BeanB beanB;

    public BeanA(){
        System.out.println("这是 BeanA 的构造函数");
    }

    @PostConstruct
    private void init() {
        System.out.println("这是BeanA 的 init 方法");
        beanB.testB();  // 调用测试函数
    }
}

3.HashMap转对象

LogBean logModel = JSONObject.parseObject(JSONObject.toJSONString(valueMap), LogBean.class);

4.切面校验

方式一

import com.xxx.common.AppBase;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class LoginCheckAspect {

    @Around(value = "execution(* com.xxx.controller.*.*(..)) && " +
            "!execution(* com.xxx.controller.SsoController.*(..)) "
    )
    public Object check(ProceedingJoinPoint pjp) throws Throwable {
        AppBase.checkLogin();
        return pjp.proceed();
    }
}

方式二

--- Check.java
import com.xxx.common.AppBase;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class LoginCheckAspect {

    @Around(value = "@annotation(com.xxx.backend.config.CheckLogin)")
    public Object check(ProceedingJoinPoint pjp) throws Throwable {
        AppBase.checkLogin();
        return pjp.proceed();
    }
}

--- CheckLogin.java
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * 登录检查注解
 *
 */
@Target(ElementType.METHOD)//注解使用范围
@Retention(RetentionPolicy.RUNTIME)//注解运行时机
public @interface CheckLogin {

}

--- method
@CheckLogin
@RequestMapping(value = "/getIt", method = RequestMethod.GET)
public ResultVO<?> getIt() throws AppException {
    return ResultVO.success("it");
}

5.Swagger配置header

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.ParameterBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.schema.ModelRef;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Parameter;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

import java.util.ArrayList;
import java.util.List;

@Configuration
@EnableSwagger2
public class Swagger2Configuration {
    //api接口包扫描路径
    public static final String SWAGGER_SCAN_BASE_PACKAGE = "com.xxx.controller";

    public static final String VERSION = "1.0.0";
    @Bean
    public Docket createRestApi() {
        ParameterBuilder tokenPar = new ParameterBuilder();
        List<Parameter> pars = new ArrayList<Parameter>();
        tokenPar.name("Info-Token").description("令牌").modelRef(new ModelRef("string")).parameterType("header").required(false).build();
        pars.add(tokenPar.build());

        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
                .apis(RequestHandlerSelectors.basePackage(SWAGGER_SCAN_BASE_PACKAGE))
                .paths(PathSelectors.any()) // 可以根据url路径设置哪些请求加入文档,忽略哪些请求
                .build()
                .globalOperationParameters(pars);
    }
    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("数据服务") //设置文档的标题
                .description("数据服务 API 接口文档") // 设置文档的描述
                .version(VERSION) // 设置文档的版本信息-> 1.0.0 Version information
                .build();
    }
}

6.允许通过一些特殊字符

    @Bean
    public ConfigurableServletWebServerFactory webServerFactory() {
        TomcatServletWebServerFactory factory = new TomcatServletWebServerFactory();
        factory.addConnectorCustomizers(new TomcatConnectorCustomizer() {
            @Override
            public void customize(Connector connector) {
                connector.setProperty("relaxedQueryChars", "|{}[]");
            }
        });
        return factory;
    }

7.url参数轉map

    /**
     * url 参数转map
     * @param url
     * @return
     */
    public static Map<String, String> getUrlMap(String url) {
        String attrStr = HtmlUtils.htmlUnescape(url);
        Map<String, String> map = new HashMap<>();
        String[] text = attrStr.split("&"); // 转换为数组
        for (String str : text) {
            String[] keyText = str.split("="); // 转换key与value的数组
            String key = "";
            String value = "";
            if (keyText.length < 1) {
                continue;
            } else if (keyText.length == 1) {
                key = keyText[0]; // key
            } else {
                key = keyText[0]; // key
                value = keyText[1]; // value
            }
            map.put(key, value);
        }
        return map;
    }

8.ByteArrayOutputStream使用

    public static void exportExcel(HttpServletResponse response, String fileName, List<List<String>> head, List<List<Object>> data, EasyExcelTitleHandler titleHandler) throws IOException,AppException {

        // 写入内存输出流
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        EasyExcel.write(baos).head(head).sheet().registerWriteHandler(titleHandler).doWrite(data);
        // 非内网 安全检查
        if(!AppBase.isClinetInternalIP()){
            // copy一个byte数组
            byte[] copyOfOutStreamBytes = baos.toByteArray();
            try {
                Check(fileName+".xlsx",copyOfOutStreamBytes);
            } catch (AppException e) {
                log.error("请求失败",e);
                throw new AppException("安全检查出错,请稍候再试!");
            }
        }

        //编码 防止中文乱码
        try {
            fileName = URLEncoder.encode(fileName,"UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf-8");
        response.setHeader("Content-disposition","attachment;filename="+fileName+".xlsx");
        // 写入response的输出流
        baos.writeTo(response.getOutputStream());
    }

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