SpringBoot獲取配置檔案資訊
阿新 • • 發佈：2019-02-16
預設application.properties中的資訊：
local.ip=192.168.238.133
local.port=8080一、Environment（一）
直接在SpringBoot啟動類main方法中：
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication 二、Environment（二）
在SpringBoot啟動類App，下級新建ConfigurationFile：
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;
import org.springframework.stereotype.Component;
@Component
public App.java
import com.xh.config.ConfigurationFile;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
@SpringBootApplication
public class App {
public static void main(String[] args) {
ConfigurableApplicationContext context = SpringApplication.run(App.class, args);
ConfigurationFile configurationFile = context.getBean(ConfigurationFile.class);
configurationFile.getConfigInfo();
}
}
三、使用@value註解
在SpringBoot掃描包下新建ServerInfo.java：
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class ServerInfo {
@Value("${local.ip}")
private String ip;
@Value("${local.port}")
private Integer port;
public String getIp() {
return ip;
}
public void setIp(String ip) {
this.ip = ip;
}
public Integer getPort() {
return port;
}
public void setPort(Integer port) {
this.port = port;
}
@Override
public String toString() {
return "ServerInfo{" +
"ip='" + ip + '\'' +
", port=" + port +
'}';
}
}
App.java
import com.xh.config.ServerInfo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
@SpringBootApplication
public class App {
public static void main(String[] args) {
ConfigurableApplicationContext context = SpringApplication.run(App.class, args);
ServerInfo serverInfo = context.getBean(ServerInfo.class);
System.out.println(serverInfo);
}
}注意： @Value(“${local.port}”)中，local.port必須在載入的配置檔案中，可以為空，不然會出現類似於Could not resolve placeholder 'local.ipq' in value "${local.ipq}" 的錯誤。
如果沒有配置項，可以給預設值，例：@Value("${local.ipq:192.168.238.145}") ， 而我的配置檔案中沒有local.ipq項也不會報錯。
四、變數的引用
配置檔案中引用配置檔案，例在application.properties中：
local.ip=192.168.238.133
local.port=8080
my.address= ${local.ip}:${local.port}得到的my.address得值就是：192.168.238.133:8080
五、獲取集合、陣列
配置方式：name[index] = value
application.properties中配置：
ds.hosts[0]=192.168.238.130
ds.hosts[1]=192.168.238.131
ds.hosts[2]=192.168.238.132
ds.ports[0]=8080
ds.ports[1]=8081
ds.ports[2]=8082新建ClusterConfig.java ：
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
@Component
@ConfigurationProperties("ds") // ds對應配置檔案ds.hosts[0]等中的ds字首
public class ClusterConfig {
// 變數名對應配置檔案ds.hosts[0]等中的 hosts
private List<String> hosts = new ArrayList<>();
// 變數名對應配置檔案ds.ports[0]等中的 ports
private Integer[] ports;
public List<String> getHosts() {
return hosts;
}
public void setHosts(List<String> hosts) {
this.hosts = hosts;
}
public Integer[] getPorts() {
return ports;
}
public void setPorts(Integer[] ports) {
this.ports = ports;
}
@Override
public String toString() {
return "ClusterConfig{" +
"hosts=" + hosts +
", ports=" + Arrays.toString(ports) +
'}';
}
}App.java
import com.xh.config.ClusterConfig;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
@SpringBootApplication
public class App {
public static void main(String[] args) {
ConfigurableApplicationContext context = SpringApplication.run(App.class, args);
ClusterConfig clusterConfig = context.getBean(ClusterConfig.class);
System.out.println(clusterConfig);
}
}六、SpringBoot設定屬性預設值
application.properties：
my.username=admin
my.password=123456方法一：直接@Value("${my.username:root}")
方法二：
App.java中
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
@SpringBootApplication
public class App {
public static void main(String[] args) {
ConfigurableApplicationContext context = SpringApplication.run(App.class, args);
// 如果沒有該配置項，則返回defaultValue，如果有該配置項，則返回對應值
String myUsername = context.getEnvironment().getProperty("my.username","root");
System.out.println("myUsername = " + myUsername);
String mysqlUsername = context.getEnvironment().getProperty("mysql.username","root");
System.out.println("mysqlUsername = " + mysqlUsername);
}
}控制檯列印結果：
myUsername = admin
mysqlUsername = root方法三：SpringApplication、map設定多個值
在App.java中：
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import java.util.HashMap;
import java.util.Map;
@SpringBootApplication
public class App {
public static void main(String[] args) {
SpringApplication application = new SpringApplication(App.class);
Map<String, Object> defaultMap = new HashMap<String, Object>();
// 如果沒有該配置項，則返回設定，如果有該配置項，則返回對應值
defaultMap.put("my.username", "root");
defaultMap.put("my.password", "111111");
defaultMap.put("my.url", "jdbc:mysql://127.0.0.1:3306/test");
defaultMap.put("my.username", "com.mysql.jdbc.Driver");
// 還可以是Properties物件
application.setDefaultProperties(defaultMap);
ConfigurableApplicationContext context = application.run(args);
System.out.println("my.username = " + context.getEnvironment().getProperty("my.username"));
System.out.println("my.password = " + context.getEnvironment().getProperty("my.password"));
System.out.println("my.url = " + context.getEnvironment().getProperty("my.url"));
System.out.println("my.username = " + context.getEnvironment().getProperty("my.username"));
}
}控制檯列印結果：
my.username = admin
my.password = 123456
my.url = jdbc:mysql://127.0.0.1:3306/test
my.username = admin