4月15到4月17我都在把毕设从eclipse重构到IDEA中,springboot最让我头疼的是它的版本问题,因为每一个版本对应的依赖包都有可能出错,这里分享一下如何成功移植用eclipse写的springboot到IDEA中,比较简单的步骤我这里不详细说了,说一下我遇到的一些很难找出问题的地方
ps:只是针对于我的项目和我个人水平,大神勿喷嘿嘿
springboot-mybatis整合坑
- 出现下方错误请查看启动类:XXXApplication 是否扫描到mapper映射文件,声明eclipse和idea不一样,这里eclipse可以跑通,idea中不行
***************************
APPLICATION FAILED TO START
***************************
Description:
Field chapterDao in cn.yixue.service.ChapterServiceImp required a bean of type 'cn.yixue.dao.ChapterMapper' that could not be found.
The injection point has the following annotations:
- @org.springframework.beans.factory.annotation.Autowired(required=true)
Action:
Consider defining a bean of type 'cn.yixue.dao.ChapterMapper' in your configuration.
以上提取出有用的信息:required a bean of type 'xxxx' that could not be found.
代表bean没注入,从bean注入寻找方向,有的人会说我用@Autowired之类的种种,但没扫到,好吧~
解决方法:
- 在相应的mapper类中加@Mapper标注让springboot根据标注去将mapper注入
@Mapper
public interface ChapterMapper {
......
}
- 启动类加
@MapperScan(value = "cn.yixue.video.dao")
value 后的包一定要对应到mapper类对应的地方,比如我的mapper在dao下,就是cn.yixue.video.dao
@SpringBootApplication
@MapperScan(value = "cn.yixue.video.dao")
@EnableDiscoveryClient
public class YixueVideoApplication {
public static void main(String[] args) {
SpringApplication.run(YixueVideoApplication.class, args);
}
}
- Spring Boot项目中含有Mybatis,打Jar包运行之后,报如下错误:
***************************
APPLICATION FAILED TO START
***************************
Description:
Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
Reason: Failed to determine a suitable driver class
Action:
Consider the following:
If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).
网上好多解决方案,针对于每个人都不一样,我的应该是打包的时候读不到我的配置文件,需要在pom.xml
里面加resourses
指定下配置文件,因为eclipse是识别的,Idea可能不会?我也不太知道,反正是加上了,因为好像有Idea读不到我的application.properties
或者application.yml
文件,我就一次性都配上了,这个大家具体遇到的时候再去搜一下就行,不用刻意的记:
<build>
<!-- 如果不添加此节点mybatis的mapper.xml文件都会被漏掉。 -->
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.yml</include>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.yml</include>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
springBoot-SpringCloud整合坑
- 利用SpringCloud做服务注册时,Eclipse需要自己导jar包依赖和配置版本,Idea直接可以再创建Springboot项目时鼠标点击引入,这个我就放几张图来解释:
最后一个next后直接finish......
之后再pom.xml里面会看到Idea自动为你引入的依赖和 spring-boot-maven-plugin
插件,插件版本我建议还是稍微低一点,因为boot真的是随着版本变动改动很大,我用的是
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>1.5.9.RELEASE</version>
</plugin>
这个也是在网上搜了很久之后找到的一个版本,还有一个1.4.9.RELEASE
也可以,之后就是看看Idea导入的SpringCloud
依赖的版本version
,版本错误很容易报java.lang.AbstractMethodError: null
这个错误我找了很久,原因也是看了一个大佬的博客找到的,具体就是因为Idea给你的依赖是根据你选择的springboot的版本来的,一般人不会去修改,这也就是为什么eclipse不容易报错,Idea容易的原因,因为eclipse得自己找...
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
我的parent的版本是<version>2.0.5.RELEASE</version>
,大佬的文章也提到了2.1.0和2.1.0以下的有区别,我还是建议用低的,低的差别不会太大,还挺稳......我还用过1.5.9.RELEASE...
- 之后配置
eureka
的服务的时候Idea提供的版本也要改,这个原因是因为如果使用${spring-cloud.version}
的话,当版本号下调到2.1.0
以下的时候,一些组件的包还是2.1.0
它不会跟随parent版本的下调而下调,也就是parent的版本小于组件的版本,这时候就会出问题
当改为Finchley.RELEASE
的时候,组件的依赖就会跟随parent的版本下调而下调
<properties>
<java.version>1.8</java.version>
<!-- 这是Idea给设的 -->
<!--<spring-cloud.version>Greenwich.SR1</spring-cloud.version>-->
<spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
解决静态资源跨域时的坑
- 之前在eclipse中静态资源访问是可以通过
@Autowired
private RestTemplate restTemplate;
直接装配的,之后到了Idea中报错了:
ERROR 31473 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Field restTemplate in 'xxxxxx'
required a bean of type 'org.springframework.web.client.RestTemplate' that could not be found.
Action:
Consider defining a bean of type 'org.springframework.web.client.RestTemplate' in your configuration.
解决方法如下,大致就是先靠@Bean装配,再用...:
@Bean
public RestTemplate restTemplate(RestTemplateBuilder builder) {
// Do any additional configuration here
return builder.build();
}
@Autowired
private RestTemplate restTemplate;
之后就不报错了(针对于我的错误)
我的 pom.xml(project的xml)
我的架构
圈住的地方是下方的pom.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>cn.yixue</groupId>
<artifactId>yixue</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<java.version>1.8</java.version>
<lombok.version>1.14.8</lombok.version>
<fastjson.version>1.2.31</fastjson.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.46</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.5</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>${fastjson.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>1.5.9.RELEASE</version>
<configuration>
<!--该配置必须-->
<fork>true</fork>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
</plugins>
</build>
<modules>
<module>yixue-commom</module>
<module>yixue-admin</module>
<module>yixue-video</module>
</modules>
</project>
这就是我移植项目遇到的一些问题,下面列一些大佬的博客,对我帮助很大,不胜感激
如有侵权,请联系我删除
- springboot @WebFilter过滤器的使用
- java.lang.AbstractMethodError: null
- 不能自动装配RestTemplate / not found
- SpringBoot 2.0 报错: Failed to configure a DataSource: ‘url‘ attribute is not specified and no embe...
- 在pom.xml文件中使用resources插件的小作用
原文地址:https://www.cnblogs.com/cxylff/p/10969375.html