Spring Cloud学习--spring cloud config server 获取配置过程

小鱼儿 2022-03-25 09:14 534阅读 0赞

在上一篇博客[《Spring Cloud学习--spring cloud config配置中心》][Spring Cloud_--spring cloud config] 中我们已经了解学习到Spring Cloud Config简单的示例工程，这篇博客我们介绍一下Spring Cloud Config Server从git地址中获取有关配置的过程。

### 1、获取配置 ###

访问http://localhost:1201/spring-cloud-config-server/master就可以获取到配置中心的相关配置信息

![70][]

Spring Cloud Config Server提供了EnvironmentController，这样通过在浏览器访问即可从git中获取配置信息

@RestController
    @RequestMapping(
        method = {RequestMethod.GET},
        path = {"${spring.cloud.config.server.prefix:}"}
    )
    public class EnvironmentController {
        private EnvironmentRepository repository;
        private ObjectMapper objectMapper;
        private boolean stripDocument;
    
        @RequestMapping({"/{name}/{profiles:.*[^-].*}"})
        public Environment defaultLabel(@PathVariable String name, @PathVariable String profiles) {
            return this.labelled(name, profiles, (String)null);
        }
    
        @RequestMapping({"/{name}/{profiles}/{label:.*}"})
        public Environment labelled(@PathVariable String name, @PathVariable String profiles, @PathVariable String label) {
            if (name != null && name.contains("(_)")) {
                name = name.replace("(_)", "/");
            }
    
            if (label != null && label.contains("(_)")) {
                label = label.replace("(_)", "/");
            }
    
            Environment environment = this.repository.findOne(name, profiles, label);
            return environment;
        }
    
        @RequestMapping({"/{name}-{profiles}.properties"})
        public ResponseEntity<String> properties(@PathVariable String name, @PathVariable String profiles, @RequestParam(defaultValue = "true") boolean resolvePlaceholders) throws IOException {
            return this.labelledProperties(name, profiles, (String)null, resolvePlaceholders);
        }
    
        @RequestMapping({"/{label}/{name}-{profiles}.properties"})
        public ResponseEntity<String> labelledProperties(@PathVariable String name, @PathVariable String profiles, @PathVariable String label, @RequestParam(defaultValue = "true") boolean resolvePlaceholders) throws IOException {
            this.validateProfiles(profiles);
            Environment environment = this.labelled(name, profiles, label);
            Map<String, Object> properties = this.convertToProperties(environment);
            String propertiesString = this.getPropertiesString(properties);
            if (resolvePlaceholders) {
                propertiesString = EnvironmentPropertySource.resolvePlaceholders(EnvironmentPropertySource.prepareEnvironment(environment), propertiesString);
            }
    
            return this.getSuccess(propertiesString);
        }
    
        @RequestMapping({"{name}-{profiles}.json"})
        public ResponseEntity<String> jsonProperties(@PathVariable String name, @PathVariable String profiles, @RequestParam(defaultValue = "true") boolean resolvePlaceholders) throws Exception {
            return this.labelledJsonProperties(name, profiles, (String)null, resolvePlaceholders);
        }
    
        @RequestMapping({"/{label}/{name}-{profiles}.json"})
        public ResponseEntity<String> labelledJsonProperties(@PathVariable String name, @PathVariable String profiles, @PathVariable String label, @RequestParam(defaultValue = "true") boolean resolvePlaceholders) throws Exception {
            this.validateProfiles(profiles);
            Environment environment = this.labelled(name, profiles, label);
            Map<String, Object> properties = this.convertToMap(environment);
            String json = this.objectMapper.writeValueAsString(properties);
            if (resolvePlaceholders) {
                json = EnvironmentPropertySource.resolvePlaceholders(EnvironmentPropertySource.prepareEnvironment(environment), json);
            }
    
            return this.getSuccess(json, MediaType.APPLICATION_JSON);
        }
    
        @RequestMapping({"/{name}-{profiles}.yml", "/{name}-{profiles}.yaml"})
        public ResponseEntity<String> yaml(@PathVariable String name, @PathVariable String profiles, @RequestParam(defaultValue = "true") boolean resolvePlaceholders) throws Exception {
            return this.labelledYaml(name, profiles, (String)null, resolvePlaceholders);
        }
    
        @RequestMapping({"/{label}/{name}-{profiles}.yml", "/{label}/{name}-{profiles}.yaml"})
        public ResponseEntity<String> labelledYaml(@PathVariable String name, @PathVariable String profiles, @PathVariable String label, @RequestParam(defaultValue = "true") boolean resolvePlaceholders) throws Exception {
            this.validateProfiles(profiles);
            Environment environment = this.labelled(name, profiles, label);
            Map<String, Object> result = this.convertToMap(environment);
            if (this.stripDocument && result.size() == 1 && ((String)result.keySet().iterator().next()).equals("document")) {
                Object value = result.get("document");
                return value instanceof Collection ? this.getSuccess((new Yaml()).dumpAs(value, Tag.SEQ, FlowStyle.BLOCK)) : this.getSuccess((new Yaml()).dumpAs(value, Tag.STR, FlowStyle.BLOCK));
            } else {
                String yaml = (new Yaml()).dumpAsMap(result);
                if (resolvePlaceholders) {
                    yaml = EnvironmentPropertySource.resolvePlaceholders(EnvironmentPropertySource.prepareEnvironment(environment), yaml);
                }
    
                return this.getSuccess(yaml);
            }
        }
    }

### 2、配置获取流程 ###

获取流程如下：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxOTI0ODYyMDc3_size_16_color_FFFFFF_t_70][] 标题

###       ###

引用：

[https://segmentfault.com/a/1190000007662334][https_segmentfault.com_a_1190000007662334]

[Spring Cloud_--spring cloud config]: https://blog.csdn.net/qq924862077/article/details/80152441
[70]: /images/20220325/d6e5bf0b72a84f5f964c5a2fea67c99c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxOTI0ODYyMDc3_size_16_color_FFFFFF_t_70]: /images/20220325/c61eef2fce534edea9e89307e6284454.png
[https_segmentfault.com_a_1190000007662334]: https://segmentfault.com/a/1190000007662334