PandaSystem

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环境

• JDK 17
• Maven 3.9.5
• SpringCloudAlibaba 2022.0.0.0-RC2
• nacos 2.2.3
• SpringBoot 3.2.0
• Mysql 8.0

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帮助

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问题大全

1. 注意： SpringBoot 3.2.0 集成mybatisplus需要 mybatis-spring 3.0.X 版本，否则会报如下错误： Invalid value type for attribute 'factoryBeanObjectType'‘': java.lang.String

   <!-- mybatis plus -->
   <dependency>
       <groupId>com.baomidou</groupId>
       <artifactId>mybatis-plus-boot-starter</artifactId>
       <version>3.5.5</version>
   </dependency>
   <dependency>
       <groupId>org.mybatis</groupId>
       <artifactId>mybatis-spring</artifactId>
       <version>3.0.3</version>
   </dependency>
   

2. 前后端交互 时间格式化的两种方法，本项目采用第一种方法解决

       1.在相应类的属性上使用注解格式化时间
       @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss",timezone = "GMT+8")
       @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
       private LocalDateTime createData;
       
       2.在application.yml文件中指定配置
       spring:
         jackson:
           date-format: yyyy-MM-dd HH:mm:ss
           time-zone: GMT+8
   

3. @RestControllerAdvice注解，本项目用于配置全局异常处理GlobalExceptionHandler类。

   通过@ControllerAdvice注解可以将对于控制器的全局配置放在同一个位置。
   注解了@RestControllerAdvice的类的方法可以使用@ExceptionHandler、@InitBinder、@ModelAttribute注解到方法上。
   @RestControllerAdvice注解将作用在所有注解了@RequestMapping的控制器的方法上。
   @ExceptionHandler：用于指定异常处理方法。当与@RestControllerAdvice配合使用时，用于全局处理控制器里的异常。
   @InitBinder：用来设置WebDataBinder，用于自动绑定前台请求参数到Model中。
   @ModelAttribute：本来作用是绑定键值对到Model中，当与@ControllerAdvice配合使用时，可以让全局的@RequestMapping都能获得在此处设置的键值对
   

4. nacos2.2.3启动报错

   org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
       at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:163)
       at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:577)
       at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145)
       at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:745)
       at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:423)
       at org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
       at org.springframework.boot.SpringApplication.run(SpringApplication.java:1317)
       at org.springframework.boot.SpringApplication.run(SpringApplication.java:1306)
       at com.alibaba.nacos.Nacos.main(Nacos.java:35)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
       at java.lang.reflect.Method.invoke(Method.java:498)
       at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
       at org.springframework.boot.loader.Launcher.launch(Launcher.java:108)
       at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
       at org.springframework.boot.loader.PropertiesLauncher.main(PropertiesLauncher.java:467)
   Caused by: org.springframework.boot.web.server.WebServerException: Unable to start embedded Tomcat
   at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:142)
   at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:104)
   at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:479)
   at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:211)
   at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:182)
   at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:160)
   ... 16 common frames omitted
   

   解决方法：执行以下代码，把结果赋值给nacos/conf/application.properties的nacos.core.auth.plugin.nacos.token.secret.key，然后启动就可以了

    import javax.crypto.KeyGenerator;
    import javax.crypto.SecretKey;
    import java.security.NoSuchAlgorithmException;
    import java.util.Base64;
    
    public class SecretKeyGenerator {
    
        public static SecretKey generate() {
            try {
                // 使用AES算法生成256位的SecretKey
                KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");
                keyGenerator.init(256);
                return keyGenerator.generateKey();
            } catch (NoSuchAlgorithmException e) {
                e.printStackTrace();
                return null;
            }
        }
     
        public static void main(String[] args) {
            SecretKey secretKey = generate();
            System.out.println(Base64.getEncoder().encodeToString(secretKey.getEncoded()));
        }
    }
   

5. 配置nacos启动报错: Add a spring.config.import=nacos: property to your configuration. If configuration is not required add spring.config.import=optional:nacos: instead. To disable this check, set spring.cloud.nacos.config.import-check.enabled=false.

   #添加pom
   <dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-starter-bootstrap</artifactId>
     <version>3.1.4</version>           
   </dependency>
   

6. Nacos 使用服务名调不了服务，提示找不到host ，服务提供者消费者均已在Nacos Sever中注册成功.

   以上不能以服务名访问的解决方法：添加了@LoadBalanced 还需要在pom.xml文件中添加
   
   <dependency>
           <groupId>org.springframework.cloud</groupId>
           <artifactId>spring-cloud-starter-loadbalancer</artifactId>
   </dependency>
   
   否则只添加@LoadBalanced是提示找不到服务名的
   

7. proto构建失败

   Could not make proto path relative: C:\Users\70852\Desktop\代码\后端\pandaSystem\analyzer-server-10001\src\main\proto\a.proto: No such file or directory
   编辑器编码改为gbk格式，文件路径不能有中文汉字
   

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