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;@RestControllerpublic 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=5druid.minIdle=5druid.maxActive=20druid.maxWait=60000druid.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;@RestControllerpublic 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;@Configurationpublic 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;@RestControllerpublic 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(yōu)先級:
1:命令行參數(shù)。(以--開頭的參數(shù),比如可以設置:--server.port對同一套代碼設置不同的參數(shù))
2: 通過 System.getProperties() 獲取的 Java 系統(tǒng)參數(shù)。
3:操作系統(tǒng)環(huán)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(tǒng)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(tǒng)的application.properties文件)
6:應用 Jar 文件內(nèi)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(nèi)容,希望對大家的學習有所幫助,也希望大家多多支持VeVb武林網(wǎng)。
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