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Posted on Edited on In , Valine:
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对于 springcloud config 的配置

如果eureka的端口不是默认的端口，需要把端口写回配置文件，因为项目启动是先去找eureka，再获取配置

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eureka:
  client:
    service-url:
      defaultZone: http://localhost:8762/eureka/

使用springcloud bus的bus-refresh接口需要springboot暴露该接口

需要在controller加@RefreshScope

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management:
  endpoints:
    web:
      exposure:
        include: "*"

添加webhook需要添加如下依赖

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<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-config-monitor</artifactId>
</dependency>

springcloud stream 同一个服务input信道和output信道不能一样。

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public interface StreamClient {

    String INPUT = "input";

    String OUTPUT = "output";

    @Input(StreamClient.INPUT)
    SubscribableChannel input();

    @Output(StreamClient.OUTPUT)
    MessageChannel output();

    /*@Input(StreamClient.INPUT2)
    SubscribableChannel input2();

    @Output(StreamClient.INPUT2)
    MessageChannel output2();*/
}

Gson转list对象的方法

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List<ProductInfo> productInfoList = new Gson().fromJson(message,new TypeToken<List<ProductInfo>>(){}.getType());

对于springcloud zuul默认过滤了cookie

zuul:

routes:
myProduct:
path: /myProduct/**
serviceId: product
sensitiveHeaders:

使用sensitiveHeaders设置为空即可不过滤cookie

对于springcloud hystrix dashboard

进入的时候，如果你是http，请不要复制他那个请求，他那个请头是https，改成http，并且把这段代码写入即可

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@Bean
public ServletRegistrationBean getServlet() {
    HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet();
    ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet);
    registrationBean.setLoadOnStartup(1);
    registrationBean.addUrlMappings("/actuator/hystrix.stream");
    registrationBean.setName("HystrixMetricsStreamServlet");
    return registrationBean;
}

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在springcloud的多模块打包问题中

mvn install 死活打包不了依赖了其他模块的模块，后来百度才发现，是spring-boot-maven-plugin这个玩意，打包的jar包只能运行，不能被依赖

所以要被依赖的jar包请把这个plugin改成下面这样

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<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
            <executions>
                <execution>
                    <phase>none</phase>
                </execution>
            </executions>
            <configuration>
                <classifier>execute</classifier>
            </configuration>
        </plugin>
    </plugins>
</build>

Posted on In Valine:
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题一

给定一个非空整数数组，除了某个元素只出现一次以外，其余每个元素均出现两次。找出那个只出现了一次的元素。

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public class N136 {

    public int singleNumber(int[] nums) {
        int ans=nums[0];
        if(nums.length>1){
            for(int i=1;i<nums.length;i++){
                ans=ans^nums[i];
            }
        }
        return ans;

    }
}

https://leetcode-cn.com/problems/single-number/

题二

给你一个整数数组 arr 。

现需要从数组中取三个下标 i、j 和 k ，其中 (0 <= i < j <= k < arr.length) 。

a 和 b 定义如下：

  • a = arr[i] ^ arr[i + 1] ^ ... ^ arr[j - 1]
  • b = arr[j] ^ arr[j + 1] ^ ... ^ arr[k]

注意：^ 表示 按位异或 操作。

请返回能够令 a == b 成立的三元组 (i, j , k) 的数目

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public static int countTriplets(int[] arr) {

    int res=0;

    if(arr.length<2){
        return 0;
    }
    for(int i=0;i<arr.length;i++){
        int temp=arr[i];
        for(int j=i+1;j<arr.length;j++){
            temp=temp^arr[j];
            if(temp==0){
                res=res+j-i;
            }
        }

    }
    return res;

}

https://leetcode-cn.com/classic/problems/count-triplets-that-can-form-two-arrays-of-equal-xor/description/?tdsourcetag=s_pctim_aiomsg

Posted on In Valine:
Symbols count in article: 1.5k Reading time ≈ 1 mins.

需要在application.yml里面连接数据库时添加运行执行多条sql语句

&allowMultiQueries=true

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spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    username: root
    password: 123456
    url: jdbc:mysql://127.0.0.1:3306/mall?characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai&allowMultiQueries=true
  redis:
    host: 127.0.0.1
    port: 6379
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<update id="updateByListPrimaryKey" parameterType="java.util.List">
  <foreach collection="productList" index="index" item="item" separator=";" >
    update mall_product
    <set>
      <if test="item.categoryId != null">
        category_id = #{item.categoryId,jdbcType=INTEGER},
      </if>
      <if test="item.name != null">
        name = #{item.name,jdbcType=VARCHAR},
      </if>
      <if test="item.subtitle != null">
        subtitle = #{item.subtitle,jdbcType=VARCHAR},
      </if>
      <if test="item.mainImage != null">
        main_image = #{item.mainImage,jdbcType=VARCHAR},
      </if>
      <if test="item.subImages != null">
        sub_images = #{item.subImages,jdbcType=VARCHAR},
      </if>
      <if test="item.detail != null">
        detail = #{item.detail,jdbcType=VARCHAR},
      </if>
      <if test="item.price != null">
        price = #{item.price,jdbcType=DECIMAL},
      </if>
      <if test="item.stock != null">
        stock = #{item.stock,jdbcType=INTEGER},
      </if>
      <if test="item.status != null">
        status = #{item.status,jdbcType=INTEGER},
      </if>

    </set>
    where id = #{item.id,jdbcType=INTEGER}
  </foreach>
</update>

Posted on In Valine:
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设置session的过期时间

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server:
  servlet:
    session:
      timeout: PT5H

其中T是天和小时的分界符,不区分大小写，时间必须按顺序

比如说 P2dt5h3m30s

就是两天五小时三分钟三十秒

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@PostMapping("/user/login")
public ResponseVO<User> login(@Valid @RequestBody UserLoginForm userLoginForm,
                              BindingResult bindingResult,
                              HttpServletRequest httpServletRequest){
    if(bindingResult.hasErrors()){
        return ResponseVO.error(ResponseEnum.PARAM_ERROR,bindingResult);

    }

    ResponseVO<User> responseVO = userService.login(userLoginForm.getUsername(), userLoginForm.getPassword());

    //设置session
    HttpSession session = httpServletRequest.getSession();
    session.setAttribute(MallConst.CURRENT_USER,responseVO.getData());

    return responseVO;

}

还有另外一种获取方法

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@PostMapping("/user/login")
public ResponseVO<User> login(@Valid @RequestBody UserLoginForm userLoginForm,
                              BindingResult bindingResult,
                              HttpSession session){
    if(bindingResult.hasErrors()){
        return ResponseVO.error(ResponseEnum.PARAM_ERROR,bindingResult);

    }

    ResponseVO<User> responseVO = userService.login(userLoginForm.getUsername(), userLoginForm.getPassword());

    //设置session
    //HttpSession session = httpServletRequest.getSession();
    session.setAttribute(MallConst.CURRENT_USER,responseVO.getData());

    return responseVO;

}