https://blog.csdn.net/iechenyb/article/details/102777704
1. springboot支持動態的讀取文件,擴展接口:org.springframework.boot.env.EnvironmentPostProcessor
我的項目使用場景起因是: 在同一台機器上起了兩個tomcat實例, 每個項目的日志文件打印路徑要配成不同, 如果每次打包手動修改打印日志的路徑太費時費力, 所以考慮把配置文件每個tomcat放一份, 啟動時自動讀取當前tomcat文件下的配置就好.
2. 我這里的自定義配置文件存放路徑: tomcat的conf文件夾下面
3. application.properties配置文件內容(我這里不同tomcat配置參數值不同)
spring.profiles.active=test
4. 定義MyEnvironmentPostProcessor實現EnvironmentPostProcessor接口
package com.hlz.web.common.config;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MutablePropertySources;
import org.springframework.core.env.PropertiesPropertySource;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.support.PropertiesLoaderUtils;
import javax.servlet.ServletContextEvent;
import java.io.File;
import java.io.IOException;
import java.util.Properties;
public class MyEnvironmentPostProcessor implements EnvironmentPostProcessor {
@Override
public void postProcessEnvironment(ConfigurableEnvironment configurableEnvironment, SpringApplication application) {
//tomcat路徑
String property = System.getProperty("catalina.home");
System.out.println("catalinahome:"+property);
String path =property+File.separator+"conf"+File.separator+"myspringboot.properties";
File file = new File(path);
System.out.println("Loading local settings from : "+path);
if (file.exists()) {
MutablePropertySources propertySources = configurableEnvironment.getPropertySources();
Properties properties = loadProperties(file);
System.out.println(properties.toString());
propertySources.addFirst(new PropertiesPropertySource("Config", properties));
}
}
private Properties loadProperties(File f) {
FileSystemResource resource = new FileSystemResource(f);
try {
return PropertiesLoaderUtils.loadProperties(resource);
} catch (IOException ex) {
throw new IllegalStateException("Failed to load local settings from " + f.getAbsolutePath(), ex);
}
}
}
5. 在classpath定義一個META-INF文件夾然后在其下面先建spring.factories文件，在其中指定：
org.springframework.boot.env.EnvironmentPostProcessor=com.hlz.web.common.config.MyEnvironmentPostProcessor
啟動工程
6. 如果同一個參數, application.yml中有定義, 外部配置文件也有定義, 以哪一個為准呢,
//以配置文件為准
propertySources.addFirst(new PropertiesPropertySource("Config", properties));
//以application.yml中的文件為准
propertySources.addLast(new PropertiesPropertySource("Config", properties));
7.一些官網的關於EnvironmentPostProcessor的說明
Allows for customization of the application's Environment prior to the application context being refreshed.
EnvironmentPostProcessor implementations have to be registered in META-INF/spring.factories, using the fully qualified name of this class as the key.
EnvironmentPostProcessor processors are encouraged to detect whether Spring's Ordered interface has been implemented or if the @Order annotation is present and to sort instances accordingly if so prior to invocation.
升級版的屬性讀取解析器：
package com.kiiik.config;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Properties;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.env.EnvironmentPostProcessor;
import org.springframework.core.env.ConfigurableEnvironment;
import org.springframework.core.env.MutablePropertySources;
import org.springframework.core.env.PropertiesPropertySource;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.support.PropertiesLoaderUtils;
import org.springframework.util.StringUtils;
public class MyEnvironmentPostProcessor implements EnvironmentPostProcessor {
/* -Dprotect.config.dir=d:/data/test
* -Dspring.config.location=d:/data/test
* */
String baseFileName= "application.properties";
@Override
public void postProcessEnvironment(ConfigurableEnvironment configurableEnvironment, SpringApplication application) {
String selfDefinedDir = System.getProperty("project.config.dir");
String springConfigDir= System.getProperty("protect.config.dir");
String tomcatHome = null;
String configFileDir="";
if(!StringUtils.isEmpty(springConfigDir))//啟動參數獲取目錄，只要指定 肯定有。
{
configFileDir = springConfigDir;//優先級最高100
}else{
if(!StringUtils.isEmpty(selfDefinedDir)){//優先級 99
configFileDir = selfDefinedDir;
}
}
if(configFileDir == null){//沒有自定義目錄
// tomcat路徑
if(!StringUtils.isEmpty(System.getProperty("catalina.home"))){
tomcatHome = System.getProperty("catalina.home");//優先級98
String projectName = System.getProperty("project.name");
if(StringUtils.isEmpty(projectName))
try {
throw new Exception("工程名不能為空，請添加-Dproject.name屬性");
} catch (Exception e) {
e.printStackTrace();
}
String relativePath = File.separator + projectName + File.separator ;
configFileDir = tomcatHome+relativePath;
}else{//tomcat也沒有定義默認目錄，讀取工程目錄同級的配置文件
String projectName = System.getProperty("project.name");
if(StringUtils.isEmpty(projectName))
try {
throw new Exception("工程名不能為空，請添加-Dproject.name屬性");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//讀取應用同級目錄下的工程名目錄下的配置文件
configFileDir = System.getProperty("user.dir") + File.separator+projectName+ File.separator;//讀取應用同級目錄下的工程名目錄下的配置文件
File[] proDirfiles = new File(configFileDir).listFiles();
if(proDirfiles.length==0){//優先級97
//classpath目錄下配置文件
File clsPath;
try {
clsPath = org.springframework.util.ResourceUtils.getFile("classpath:");
configFileDir = clsPath.getAbsolutePath()+ File.separator;
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}//優先級96
}
}
}
if(!configFileDir.endsWith("/")&&!configFileDir.endsWith("\\")){
configFileDir = configFileDir.concat(File.separator);
}
System.out.println("configFileDir:" + configFileDir);
MutablePropertySources propertySources = configurableEnvironment.getPropertySources();
Properties appProperties = loadProperties(new File(configFileDir+baseFileName));
propertySources.addFirst(new PropertiesPropertySource("Config", appProperties));
File[] files = new File(configFileDir).listFiles();
if(files.length ==0)
try {
throw new Exception("沒有發現配置文件！");
} catch (Exception e) {
e.printStackTrace();
}
for(int i=0;i<files.length;i++){
if(files[i].getName().contains("properties")&&!baseFileName.equals(files[i].getName())){
System.out.println("load setting file :"+files[i]);
propertySources.addFirst(new PropertiesPropertySource(files[i].getName(), loadProperties(new File(configFileDir+files[i].getName()))));
}
}
}
private Properties loadProperties(File f) {
FileSystemResource resource = new FileSystemResource(f);
try {
return PropertiesLoaderUtils.loadProperties(resource);
} catch (IOException ex) {
throw new IllegalStateException("Failed to load local settings from " + f.getAbsolutePath(), ex);
}
}
}
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原文鏈接：https://blog.csdn.net/iechenyb/article/details/102777704