您好,登錄后才能下訂單哦!
Spring Boot讀取配置文件
1)通過注入ApplicationContext 或者 Environment對象來讀取配置文件里的配置信息。
package com.ivan.config.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.ApplicationContext; import org.springframework.core.env.Environment; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; @RestController public class ConfigController { @Autowired ApplicationContext context; @Autowired Environment environment; @RequestMapping(value="/config", method={RequestMethod.GET}) public String getConfigContent(){ String name = context.getEnvironment().getProperty("db.user.name"); return name; } @RequestMapping(value="/configEnv", method={RequestMethod.GET}) public String getConfigEnvironment(){ String name = environment.getProperty("db.user.name"); return name; } }
2)通過@ConfigurationProperties配合@PropertySource讀取配置文件里的配置信息。
1:通過@PropertySource指定當前類里屬性的配置文件地址,ConfigurationProperties可以指定配置的前綴,@Configuration用于定義一個配置類:
package com.ivan.config.entity; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.PropertySource; @Configuration @PropertySource("classpath:config/druid.properties") @ConfigurationProperties(prefix = "druid") public class DruidConfig { private int initialSize; private int minIdle; private int maxActive; private int maxWait; private String validationQuery; private boolean testWhileIdle; private boolean testOnBorrow; private boolean testOnReturn; public int getInitialSize() { return initialSize; } public void setInitialSize(int initialSize) { this.initialSize = initialSize; } public int getMinIdle() { return minIdle; } public void setMinIdle(int minIdle) { this.minIdle = minIdle; } public int getMaxActive() { return maxActive; } public void setMaxActive(int maxActive) { this.maxActive = maxActive; } public int getMaxWait() { return maxWait; } public void setMaxWait(int maxWait) { this.maxWait = maxWait; } public String getValidationQuery() { return validationQuery; } public void setValidationQuery(String validationQuery) { this.validationQuery = validationQuery; } public boolean isTestWhileIdle() { return testWhileIdle; } public void setTestWhileIdle(boolean testWhileIdle) { this.testWhileIdle = testWhileIdle; } public boolean isTestOnBorrow() { return testOnBorrow; } public void setTestOnBorrow(boolean testOnBorrow) { this.testOnBorrow = testOnBorrow; } public boolean isTestOnReturn() { return testOnReturn; } public void setTestOnReturn(boolean testOnReturn) { this.testOnReturn = testOnReturn; } @Override public String toString() { return "DruidConfig [initialSize=" + initialSize + ", minIdle=" + minIdle + ", maxActive=" + maxActive + ", maxWait=" + maxWait + ", validationQuery=" + validationQuery + ", testWhileIdle=" + testWhileIdle + ", testOnBorrow=" + testOnBorrow + ", testOnReturn=" + testOnReturn + "]"; } }
2:對應的配置文件:
druid.initialSize=5 druid.minIdle=5 druid.maxActive=20 druid.maxWait=60000 druid.validationQuery=select 'x' druid.testWhileIdle=true druid.testOnBorrow=true druid.testOnReturn=true
3:在需要用到的類通過@Autowired注入
package com.ivan.config.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import com.ivan.config.entity.DruidConfig; @RestController public class DruidConfigController { @Autowired public DruidConfig druidConfig; @RequestMapping(value="/druidConfig", method={RequestMethod.GET}) public String getDruidConfig(){ return druidConfig.toString(); } }
3)通過@Value注解
1:需要得到配置屬性的類如下,可以在任何需要得到配置的地方用@Value注解
package com.ivan.config.entity; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Configuration; @Configuration public class ValueTest { @Value("${db.user.name}") private String username; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } }
2:測試Controller類通過@Autowired注入實體類
package com.ivan.config.controller; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import com.ivan.config.entity.ValueTest; @RestController public class ValueController { @Autowired private ValueTest value; @RequestMapping(value="/configValue", method={RequestMethod.GET}) public String getConfig(){ return value.getUsername(); } }
Spring boot 配置文件優先級:
1:命令行參數。(以--開頭的參數,比如可以設置:--server.port對同一套代碼設置不同的參數)
2: 通過 System.getProperties() 獲取的 Java 系統參數。
3:操作系統環境變量(這解釋了為什么你通過application.properties設置的user.name取的是系統的用戶名了)
4:從 java:comp/env 得到的 JNDI 屬性。
5: 應用 Jar 文件之外的屬性文件(系統的application.properties文件)
6:應用 Jar 文件內部的屬性文件。
7: 在應用配置 Java 類(包含“@Configuration”注解的 Java 類)中通過“@PropertySource”注解聲明的屬性文件。
8: 通過“SpringApplication.setDefaultProperties”聲明的默認屬性。
以上就是本文的全部內容,希望對大家的學習有所幫助,也希望大家多多支持億速云。
免責聲明:本站發布的內容(圖片、視頻和文字)以原創、轉載和分享為主,文章觀點不代表本網站立場,如果涉及侵權請聯系站長郵箱:is@yisu.com進行舉報,并提供相關證據,一經查實,將立刻刪除涉嫌侵權內容。