SpringBoot - 孤独时代

打出来的jar包找不到主类?
配置skip!

            <plugin>
             <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring-boot.version}</version>
                <configuration>
                    <skip>false</skip>
                </configuration>
            </plugin>

多环境开发配置

spring:
  profiles:
    active: test

---
spring:
  profiles: pro
server:
  port: 80

---
spring:
  profiles: dev
server:
  port: 81
---
spring:
  profiles: tett
server:
  port: 82

读取yaml数据

例子: 这里的yaml数据是

database:
  type: postgresql
  host: 127.0.0.1
  port: 5432
  username: admin
  password: secret

直接读取

 @Value("${database.username}")
 private String u2;

新建一个pojo类

package com.itheima.domian;


import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix = "database")
public class DataBase {
    private String type;
    private String host;
    private Integer port;
    private String username;
    private String password;

    public String getHost() {
        return host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Integer getPort() {
        return port;
    }

    public void setPort(Integer port) {
        this.port = port;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    @Override
    public String toString() {
        return "DataBase{" +
                "host='" + host + '\'' +
                ", type='" + type + '\'' +
                ", port=" + port +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

然后自动装配即可~

@Autowired
    private DataBase dataBase;

多环境直接通过启动参数修改

java -jar springboot_01_quickstart-0.0.1-SNAPSHOT.jar

java -jar springboot_01_quickstart-0.0.1-SNAPSHOT.jar --spring.profiles.active=test

java -jar springboot_01_quickstart-0.0.1-SNAPSHOT.jar --spring.profiles.active=test --server.port=88

即使把参数顺序反过来，即 --server.port=88 在前，--spring.profiles.active=test 在后，应用仍然会以端口 88 启动。因为命令行参数的优先级总是高于配置文件中的设置。

yml和pom联调

在pom.xml中也可以定义不同开发环境, 如下方代码所示
但是想在yaml文件中读取到现在选择的配置, 还需要一些操作

    <profiles>
        <!--开发环境-->
        <profile>
            <id>dev</id>
            <properties>
                <profile.active>dev</profile.active>
            </properties>
        </profile>
        <!--生产环境-->
        <profile>
            <id>pro</id>
            <properties>
                <profile.active>pro</profile.active>
            </properties>

        </profile>
        <!--测试环境-->
        <profile>
            <id>test</id>
            <properties>
                <profile.active>test</profile.active>
            </properties>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
        </profile>
    </profiles>

首先导入这个插件

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-resources-plugin</artifactId>
                <version>3.2.0</version>
                <configuration>
                    <encoding>UTF-8</encoding>
                    <useDefaultDelimiters>true</useDefaultDelimiters>
                </configuration>
            </plugin>

配置过滤器(在标签中)

        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.yml</include>
                    <include>**/*.properties</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>

异常拦截

使用 @RestControllerAdvice 注解和 @ExceptionHandler 注解

是 @ControllerAdvice 和 @ResponseBody 两个注解的组合。

@ExceptionHandler(Exception.class)用来指定处理哪种错误

既是响应体, 也是异常拦截
有了这个注解就不需要别的配置了

package com.itheima.controller;

import com.itheima.exception.BusinessException;
import com.itheima.exception.SystemException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

@RestControllerAdvice
public class ProjectExceptionAdvice {

    @ExceptionHandler(SystemException.class)
    public Result doSystemException(SystemException e){
        //记录日志
        //发送消息给运维
        //发送邮件给运维
        return new Result(e.getCode(), null, "系统级错误1:" + e.getMessage());
    }


    @ExceptionHandler(BusinessException.class)
    public Result doBusinessException(BusinessException e){
        return new Result(e.getCode(), null, "业务级错误2:" + e.getMessage());
    }


    @ExceptionHandler(Exception.class)
    public Result doException(Exception e){
        //记录日志
        //发送消息给运维
        //发送邮件给运维
        System.out.println("异常, 我草泥马");
        return new Result(Code.SYSTEM_UNKNOW_ERR, null, "其他错误3系统繁忙, 请稍后再试");
    }

}

Maven聚合/继承

父工程的结构如下图所示

parent-project
│
├── pom.xml
│
├── module-a
│   └── pom.xml
│
└── module-b
    └── pom.xml

父项目
父项目是空的, 只需要填写pom文件, 设置打包方式为pom, 标签设置需要管理的子项目

<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>com.example</groupId>
    <artifactId>parent-project</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>

    <modules>
        <module>module-a</module>
        <module>module-b</module>
    </modules>
</project>

子项目
子项目通过标签继承父项目

<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>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>parent-project</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <artifactId>module-a</artifactId>
    <dependencies>
        <!-- 在这里添加 module-a 的依赖 -->
    </dependencies>
</project>

<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>
    <parent>
        <groupId>com.example</groupId>
        <artifactId>parent-project</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <artifactId>module-b</artifactId>
    <dependencies>
        <!-- 在这里添加 module-b 的依赖 -->
    </dependencies>
</project>

Maven配置属性

使用标签配置可以复用的属性, ${}解析值

<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>com.example</groupId>
    <artifactId>my-project</artifactId>
    <version>1.0-SNAPSHOT</version>

<!--**我在这**-->
    <properties>
        <java.version>1.8</java.version>
        <spring.version>5.3.10</spring.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

properties文件加载maven配置

像Maven配置可服用属性一样写
在父工程中配置拦截由于子项目继承了父工程, 拦截也会一并读取到

<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>com.example</groupId>
    <artifactId>parent-project</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>pom</packaging>

<!--**配置在这**-->
    <properties>
        <jdbc.url>jdbc:mysql://localhost:3306/mydb</jdbc.url>
        <jdbc.username>root</jdbc.username>
        <jdbc.password>password</jdbc.password>
    </properties>

<!--**拦截在这**-->
    <build>
        <resources>
            <resource>
                <directory>${project.basedir}/src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

    <modules>
        <module>child-module</module>
    </modules>
</project>

Maven配置多环境开发

在父工程中设定多种来写配置文件

<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>com.example</groupId>
    <artifactId>parent-project</artifactId>
    <version>1.0.0</version>
    <packaging>pom</packaging>

    <profiles>
        <!-- 开发环境 -->
        <profile>
            <id>development</id>
            <properties>
                <env>development</env>
                <db.url>jdbc:mysql://localhost:3306/dev_db</db.url>
                <db.username>dev_user</db.username>
                <db.password>dev_password</db.password>
            </properties>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
        </profile>

        <!-- 测试环境 -->
        <profile>
            <id>testing</id>
            <properties>
                <env>testing</env>
                <db.url>jdbc:mysql://localhost:3306/test_db</db.url>
                <db.username>test_user</db.username>
                <db.password>test_password</db.password>
            </properties>
        </profile>

        <!-- 生产环境 -->
        <profile>
            <id>production</id>
            <properties>
                <env>production</env>
                <db.url>jdbc:mysql://localhost:3306/prod_db</db.url>
                <db.username>prod_user</db.username>
                <db.password>prod_password</db.password>
            </properties>
        </profile>
    </profiles>
</project>

利用 -P 指令其实也可以指定某个环境

mvn clean install -P production<!--先删除target, 再用生产环境安装-->

跳过测试

点击小闪电标志(跳过全部测试)
配置插件
跳过全部测试

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>3.0.0-M5</version> <!-- 请根据需要选择合适的版本 -->
            <configuration>
                <skipTests>true</skipTests>
            </configuration>
        </plugin>
    </plugins>
</build>

跳过某个测试类

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>3.0.0-M5</version> <!-- 请根据需要选择合适的版本 -->
            <configuration>
                <excludes>
                    <exclude>**/SkipThisTest*.java</exclude>
                </excludes>
            </configuration>
        </plugin>
    </plugins>
</build>

跳过某个测试方法

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-surefire-plugin</artifactId>
            <version>3.0.0-M5</version> <!-- 请根据需要选择合适的版本 -->
            <configuration>
                <includes>
                    <include>**/MyTest*.java</include>
                </includes>
                <excludes>
                    <exclude>**/MyTest.java#testMethodToSkip</exclude>
                </excludes>
            </configuration>
        </plugin>
    </plugins>
</build>

通过maven指令
mvn clean install -DskipTests

Maven私服

设置上传方式

    <distributionManagement>
        <repository>
            <id>itheima-release</id>
            <url>http://localhost:8081/repository/itheima-release/</url>
        </repository>
        <snapshotRepository>
            <id>itheima-snapshot</id>
            <url>http://localhost:8081/repository/itheima-snapshot/</url>
        </snapshotRepository>
    </distributionManagement>