最近微框架spring-boot很火，筆者也跟風學習了一下，廢話不多說，現給出一個讀取配置文件的例子。
首先，需要在pom文件中依賴以下jar包
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies>
其次，我們需要一個spring-boot啟動類
@SpringBootApplication @EnableConfigurationProperties({PropsConfig.class,YmlConfig.class}) public class ReadApplication { public static void main(String[] args) { SpringApplication.run(ReadApplication.class, args); } }沒錯，@EnableConfigurationProperties註解裡指出的PropsConfig.class,YmlConfig.class分別就是讀取props和yml配置文件的類。接下來，我們分別進行讀取properties和yml配置文件的具體實現。
1.讀取properties配置文件
在類路徑下放置一個application.properties文件，大致內容如下：
master.ds.driverClassName=com.mysql.jdbc.Driver master.ds.url=jdbc:mysql://localhost:3306/test master.ds.username=root master.ds.password=root master.ds.filters=stat master.ds.maxActive=20 master.ds.initialSize=1 master.ds.maxWait=60000 master.ds.minIdle=10 master.ds.timeBetweenEvictionRunsMillis=60000 master.ds.minEvictableIdleTimeMillis=300000 master.ds.validationQuery=SELECT 'x' master.ds.testWhileIdle=true master.ds.testOnBorrow=false master.ds.testOnReturn=false master.ds.poolPreparedStatements=true master.ds.maxOpenPreparedStatements=100 master.ds.removeAbandoned=true master.ds.removeAbandonedTimeout=1800 master.ds.logAbandoned=true
讀取props配置的類，很簡單，基本就是一個pojo/vo類，在類上加載@ConfigurationProperties註解即可。
@ConfigurationProperties(prefix = "master.ds",locations = "classpath:application.properties") public class PropsConfig { private String driverClassName; private String url; private String username; private String password; private String filters; private String maxActive; private String initialSize; private String maxWait; public String getDriverClassName() { return driverClassName; } public void setDriverClassName(String driverClassName) { this.driverClassName = driverClassName; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getFilters() { return filters; } public void setFilters(String filters) { this.filters = filters; } public String getMaxActive() { return maxActive; } public void setMaxActive(String maxActive) { this.maxActive = maxActive; } public String getInitialSize() { return initialSize; } public void setInitialSize(String initialSize) { this.initialSize = initialSize; } public String getMaxWait() { return maxWait; } public void setMaxWait(String maxWait) { this.maxWait = maxWait; } }單元測試類
@RunWith(SpringJUnit4ClassRunner.class) @SpringBootTest(classes = ReadApplication.class) public class ReadApplicationPropsTests { @Autowired private PropsConfig propsConfig; @Test public void testDisplayPropsValue() { String driverClassName = propsConfig.getDriverClassName(); String url = propsConfig.getUrl(); String username = propsConfig.getUsername(); String password = propsConfig.getPassword(); String filters = propsConfig.getFilters(); String maxActive = propsConfig.getMaxActive(); String initialSize = propsConfig.getInitialSize(); String maxWait = propsConfig.getMaxWait(); System.out.println("driverClassName -> " + driverClassName); System.out.println("url -> " + url); System.out.println("username -> " + username); System.out.println("password -> " + password); System.out.println("initialSize -> " + initialSize); System.out.println("maxWait -> " + maxWait); } }可以看到在控制台輸出的測試內容：
driverClassName -> com.mysql.jdbc.Driver url -> jdbc:mysql://localhost:3306/test username -> root password -> root initialSize -> 1 maxWait -> 60000
2.讀取yml配置文件
在類路徑下放置一個application.yml文件，大致內容如下：
myProps: #自定義的屬性和值simpleProp: simplePropValue arrayProps: 1,2,3,4,5 listProp1: - name: abc value: abcValue - name: efg value: efgValue listProp2: - config2Value1 - config2Vavlue2 mapProps: key1: value1 key2: value2
讀取yml配置文件的類。
@ConfigurationProperties(prefix="myProps") //application.yml中的myProps下的屬性public class YmlConfig { private String simpleProp; private String[] arrayProps; private List<Map<String, String>> listProp1 = new ArrayList<>(); //接收prop1裡面的屬性值private List<String> listProp2 = new ArrayList<>(); //接收prop2裡面的屬性值private Map<String, String> mapProps = new HashMap<>(); //接收prop1裡面的屬性值public String getSimpleProp() { return simpleProp; } public void setSimpleProp(String simpleProp) { this.simpleProp = simpleProp; } public List<Map<String, String>> getListProp1() { return listProp1; } public List<String> getListProp2() { return listProp2; } public String[] getArrayProps() { return arrayProps; } public void setArrayProps(String[] arrayProps) { this.arrayProps = arrayProps; } public Map<String, String> getMapProps() { return mapProps; } public void setMapProps(Map<String, String> mapProps) { this.mapProps = mapProps; } }單元測試類
@RunWith(SpringJUnit4ClassRunner.class) @SpringBootTest(classes = ReadApplication.class) public class ReadApplicationYmlTests { @Autowired private YmlConfig ymlConfig; @Test public void testDisplayYmlValue() throws JsonProcessingException { System.out.println("simpleProp: " + ymlConfig.getSimpleProp()); ObjectMapper objectMapper = new ObjectMapper(); System.out.println("arrayProps: " + objectMapper.writeValueAsString(ymlConfig.getArrayProps())); System.out.println("listProp1: " + objectMapper.writeValueAsString(ymlConfig.getListProp1())); System.out.println("listProp2: " + objectMapper.writeValueAsString(ymlConfig.getListProp2())); System.out.println("mapProps: " + objectMapper.writeValueAsString(ymlConfig.getMapProps())); } }可以看到在控制台輸出的測試內容：
simpleProp: simplePropValue arrayProps: ["1","2","3","4","5"] listProp1: [{"name":"abc","value":"abcValue"},{"name":"efg","value":"efgValue"}] listProp2: ["config2Value1","config2Vavlue2"] mapProps: {"key1":"value1","key2":"value2"}是不是很神奇，不需要spring的applicationContext.xml文件也可以順利運行之。
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武林網。