java的springboot项目读取properties文件属性有很多种方式，今天我们介绍通过PropertiesLoaderUtils来读取properties文件属性。我们通过两个例子来看看具体如何实现？
例子1
使用PropertiesLoaderUtils
app-config.properties
#### 通过注册监听器(`Listeners`) + `PropertiesLoaderUtils`的方式 com.zyd.type=Springboot - Listeners com.zyd.title=使用Listeners + PropertiesLoaderUtils获取配置文件 com.zyd.name=zyd com.zyd.address=Beijing com.zyd.company=in
PropertiesListener.java 用来初始化加载配置文件
package com.zyd.property.listener;
import org.springframework.boot.context.event.ApplicationStartedEvent;
import org.springframework.context.ApplicationListener;
import com.zyd.property.config.PropertiesListenerConfig;
/**
* 配置文件监听器，用来加载自定义配置文件
*/
public class PropertiesListener implements ApplicationListener<ApplicationStartedEvent> {
private String propertyFileName;
public PropertiesListener(String propertyFileName) {
this.propertyFileName = propertyFileName;
}
@Override
public void onApplicationEvent(ApplicationStartedEvent event) {
PropertiesListenerConfig.loadAllProperties(propertyFileName);
}
} PropertiesListenerConfig.java 加载配置文件内容
package com.zyd.property.config; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.util.HashMap; import java.util.Map; import java.util.Properties; import org.springframework.beans.BeansException; import org.springframework.core.io.support.PropertiesLoaderUtils;
public class PropertiesListenerConfig {
public static Map<String, String> propertiesMap = new HashMap<>();
private static void processProperties(Properties props) throws BeansException {
propertiesMap = new HashMap<String, String>();
for (Object key : props.keySet()) {
String keyStr = key.toString();
try {
// PropertiesLoaderUtils的默认编码是ISO-8859-1,在这里转码一下
propertiesMap.put(keyStr, new String(props.getProperty(keyStr).getBytes("ISO-8859-1"), "utf-8"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (java.lang.Exception e) {
e.printStackTrace();
}
}
}
public static void loadAllProperties(String propertyFileName) {
try {
Properties properties = PropertiesLoaderUtils.loadAllProperties(propertyFileName);
processProperties(properties);
} catch (IOException e) {
e.printStackTrace();
}
}
public static String getProperty(String name) {
return propertiesMap.get(name).toString();
}
public static Map<String, String> getAllProperty() {
return propertiesMap;
}
}Applaction.java 启动类
package com.zyd.property;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.zyd.property.config.PropertiesListenerConfig;
import com.zyd.property.listener.PropertiesListener;
@SpringBootApplication
@RestController
public class Applaction {
/**
*
* 通过注册监听器(`Listeners`) + `PropertiesLoaderUtils`的方式
*/
@RequestMapping("/listener")
public Map<String, Object> listener() {
Map<String, Object> map = new HashMap<String, Object>();
map.putAll(PropertiesListenerConfig.getAllProperty());
return map;
}
public static void main(String[] args) throws Exception {
SpringApplication application = new SpringApplication(Applaction.class);
注册监听器
application.addListeners(new PropertiesListener("app-config.properties"));
application.run(args);
}
}访问结果：
{"com.zyd.name":"zyd","com.zyd.address":"Beijing","com.zyd.title":"使用Listeners + PropertiesLoaderUtils获取配置文件","com.zyd.type":"Springboot - Listeners","com.zyd.company":"in"}例子2
首先在resources文件夹下建立app-config.properties文件里面有两个属性
my.name=zhangsan my.old=18
文件属性监听器
import org.springframework.boot.context.event.ApplicationStartedEvent;
import org.springframework.context.ApplicationListener;
public class PropertiesListener implements ApplicationListener<ApplicationStartedEvent> {
private String propertyFileName;
public PropertiesListener(String propertyFileName) {
this.propertyFileName = propertyFileName;
}
@Override
public void onApplicationEvent(ApplicationStartedEvent event) {
PropertiesListenerConfig.loadAllProperties(propertyFileName);
}
}编写PropertiesListenerConfig
import org.springframework.beans.BeansException;
import org.springframework.core.io.support.PropertiesLoaderUtils;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
public class PropertiesListenerConfig {
public static Map propertiesMap = new HashMap();
private static void processProperties(Properties props) throws BeansException {
propertiesMap = new HashMap<String, String>();
for (Object key : props.keySet()) {
String keyStr = key.toString();
try {
// PropertiesLoaderUtils的默认编码是ISO-8859-1,在这里转码一下
propertiesMap.put(keyStr, new String(props.getProperty(keyStr).getBytes("ISO-8859-1"), "utf-8"));
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (java.lang.Exception e) {
e.printStackTrace();
}
}
}
public static void loadAllProperties(String propertyFileName) {
try {
Properties properties = PropertiesLoaderUtils.loadAllProperties(propertyFileName);
processProperties(properties);
} catch (IOException e) {
e.printStackTrace();
}
}
public static String getProperty(String name) {
return propertiesMap.get(name).toString();
}
public static Map<String, String> getAllProperty() {
return propertiesMap;
}
}编写完成之后需要在项目启动的时候注册监听器，修改启动的main函数
public static void main(String[] args) {
SpringApplication application = new SpringApplication(DemoSpringbootApplication.class);
//注册监听器
application.addListeners(new PropertiesListener("app-config.properties"));
application.run(args);
}控制器类
@RestController
@RequestMapping(value = "/my")
public class MyController {
@RequestMapping("/test6")
public Map<String, Object> test6() {
Map<String, Object> map = new HashMap<String, Object>();
map.putAll(PropertiesListenerConfig.getAllProperty());
return map;
}
}通过以上内容我们知道了java springboot使用PropertiesLoaderUtils读取properties文件配置属性的方法。感谢您访问“我爱捣鼓(www.woaidaogu.com)”网站的内容，希望对大家有所帮助！引用本文内容时，请注明出处！谢谢合作！