创建自定义starter及读取resources资源目录下的文件

生成 maven 项目结构

包含的资源目录如下

pom文件中指定生成格式

<packaging>jar</packaging>

创建对应的自定义配置对象

@ConfigurationProperties(prefix = "app.huitongredis")
public class HuitongRedisProperties {

    /**
     * 环境
     */
    private String env = "dev";

    //"redis-config/dev";
    /**
     * 证书文件路径
     */
    private String basedir;

    /**
     * redis host port list, format=host:port. use ',' sep
     */
    private String hostListString;

    /**
     * 超时时间秒
     */
    private int timeout = 30;

    /**
     * 最长等待时间秒
     */
    private int maxWait = 30;

    private int minIdle = 0;

    private int maxIdle = 1;

}

创建 autoConfiguration 配置类

此处需要将注入 spring context 的 bean 注入进来

读取资源文件
如果使用 file 方式是读取不到资源文件的，目标项目中依赖的 starter 只是一个 jar包，无法读取这个jar包下的资源文件，需要使用如下方式来读取
使用如下方式 类似于mybatis 读取 mapper 的方式读取resources目录下的资源文件

PathMatchingResourcePatternResolver patternResolver = new PathMatchingResourcePatternResolver(HuitongRedisAutoConfiguration.class.getClassLoader());
patternResolver.getResource(srcFile).getInputStream(); //可以获取文件输入流

@Slf4j
@Configuration
@ConditionalOnClass(HuitongRedisProperties.class)
@EnableConfigurationProperties(HuitongRedisProperties.class)
public class HuitongRedisAutoConfiguration {

    @Autowired
    private HuitongRedisProperties redisProperties;


    @Bean
    @Primary
    public RedisConnectionFactory redisConnectionFactory() {
        System.setProperty("java.security.krb5.conf", getKrb5Path());
        AuthConfiguration authConfiguration = new AuthConfiguration(getKeytabPath(), redisProperties.getPrincipal());
        GlobalConfig.setAuthConfiguration(authConfiguration);

        JedisPoolConfig poolConfig = new JedisPoolConfig();
        poolConfig.setMaxWaitMillis(Duration.ofSeconds(redisProperties.getMaxWait()).toMillis());
        poolConfig.setMaxIdle(redisProperties.getMaxIdle());
        poolConfig.setMinIdle(redisProperties.getMinIdle());

        JedisClientConfiguration clientConfig = JedisClientConfiguration.builder()
                .usePooling()
                .poolConfig(poolConfig)
                .and()
                .readTimeout(Duration.ofSeconds(redisProperties.getTimeout()))
                .connectTimeout(Duration.ofSeconds(redisProperties.getTimeout())).build();

        RedisClusterConfiguration clusterConfig = new RedisClusterConfiguration(getRedisNodeSet());
        return new JedisConnectionFactory(clusterConfig, clientConfig);
    }

    @Bean
    public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
        StringRedisTemplate template = new StringRedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    }

    @Bean
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
        RedisTemplate<Object, Object> template = new RedisTemplate();
        template.setConnectionFactory(redisConnectionFactory);
        return template;
    }


    public String getKrb5Path() {
        if (StringUtils.isBlank(redisProperties.getBasedir())) {
            String baseDirByEnvname = ConfigConst.Env.getBaseDirByEnvname(redisProperties.getEnv());
            String srcFile = baseDirByEnvname + File.separator + ConfigConst.KRB5_FILENAME;
            PathMatchingResourcePatternResolver patternResolver = new PathMatchingResourcePatternResolver(HuitongRedisAutoConfiguration.class.getClassLoader());
            String desFile = getTempDirPath() + ConfigConst.KRB5_FILENAME;
            try {
                FileUtils.copyInputStreamToFile(patternResolver.getResource(srcFile).getInputStream(), new File(desFile));
            } catch (IOException e) {
                e.printStackTrace();
                throw new RuntimeException("init HW redis krb5 error", e);
            }
            log.info("dest file: " + desFile);
            return desFile;
        } else {
            return redisProperties.getBasedir() + File.separator + ConfigConst.KRB5_FILENAME;
        }
    }

    private String getKeytabPath() {
        if (StringUtils.isBlank(redisProperties.getBasedir())) {
            String baseDirByEnvname = ConfigConst.Env.getBaseDirByEnvname(redisProperties.getEnv());
            String srcFile = baseDirByEnvname + File.separator + ConfigConst.KEYTAB_FILENAME;
            PathMatchingResourcePatternResolver patternResolver = new PathMatchingResourcePatternResolver(HuitongRedisAutoConfiguration.class.getClassLoader());
            String desFile = getTempDirPath() + ConfigConst.KEYTAB_FILENAME;
            try {
                FileUtils.copyInputStreamToFile(patternResolver.getResource(srcFile).getInputStream(), new File(desFile));
            } catch (IOException e) {
                e.printStackTrace();
                throw new RuntimeException("init HW redis keytab error", e);
            }
            log.info("dest file: " + desFile);
            return desFile;
        } else {
            return redisProperties.getBasedir() + File.separator + ConfigConst.KEYTAB_FILENAME;
        }
    }

    private String getTempDirPath() {
        String tempPath = System.getProperty(ConfigConst.TEMP_DIR_PROPERTY);
        if (!(tempPath.endsWith("/") || tempPath.endsWith("\\"))) {
            return tempPath + File.separator;
        }
        return tempPath;
    }

    private Set<String> getRedisNodeSet() {
        Set<String> result = null;
        if (StringUtils.isBlank(redisProperties.getHostListString())) {
            result = parseHostListString(ConfigConst.Env.getHostAndPortSetByEnvname(redisProperties.getEnv()));
        } else {
            result = parseHostListString(redisProperties.getHostListString());
        }
        return result;
    }

    public static Set<String> parseHostListString(String hostListString) {
        Set<String> result = new HashSet<>();
        if (StringUtils.isNotBlank(hostListString)) {
            result.addAll(Arrays.asList(hostListString.split(",")));
        }
        return result;
    }
}

为了使使用方方便使用，创建自定义 Enable，使用方只需引入对应的enable就可以直接使用

@Import 功能是将需要导入的自动化配置类导入，使用方可以将我们注入的bean注入到使用系统spring环境中

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Import(HuitongRedisAutoConfiguration.class)
public @interface EnableHuitongRedis {
}

最重要的要想 springboot 能够自动配置需要将自动化配置类配置到 spring.factories 文件中

org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.huitong.config.HuitongRedisAutoConfiguration