标签:单例模式 properties propertiesutil 配置文件
单例模式PropertiesUtil工具类
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* 读取配置文件
* <pre>
* Description
* Created at: 2017年1月18日 下午3:44:33
* </pre>
*/
public class PropertiesUtil {
private Properties properties = null;
private ClassLoader oClassLoader = null;
private static Map<String, PropertiesUtil> instanceMap = new HashMap<String, PropertiesUtil>();
private String propertyFileName;
private Log log = LogFactory.getLog(PropertiesUtil.class);
//定义私有构造方法(防止通过 new PropertiesUtil()去实例化)
private PropertiesUtil(String propertyFileName) {
this.propertyFileName = propertyFileName;
loadProperties();
}
/**
* 获取单例对象
* @param propertyFileName 文件名称
* @return
*/
public static PropertiesUtil getInstance(String propertyFileName) {
if (instanceMap.get(propertyFileName) != null) {
return (PropertiesUtil) instanceMap.get(propertyFileName);
}
//实例化
PropertiesUtil instance = new PropertiesUtil(propertyFileName);
instanceMap.put(propertyFileName, instance);
return instance;
}
/**
* 加载properties文件
*/
private void loadProperties(){
try {
this.properties = new Properties();
this.oClassLoader = Thread.currentThread().getContextClassLoader();
InputStream is = oClassLoader.getResourceAsStream(this.propertyFileName + ".properties");
if (is != null) {
this.properties.load(is);
is.close();
}
is = null;
} catch (Exception e) {
this.log.error("找不到指定的文件,查看文件名是否正确:" + propertyFileName + e.getMessage(), e);
}
}
/**
* 获取文件属性值
* @param propertyName 属性名
* @param defaultValue 默认值
* @return
*/
public String getPropertyAsString(String propertyName, String defaultValue) {
try {
if (this.properties == null) {
loadProperties();
}
return this.properties.getProperty(propertyName, defaultValue);
} catch (Exception e) {
log.error(propertyName + "属性文件读取错误" + e.getMessage(), e);
}
return defaultValue;
}
/**
* 获取String类型的文件属性值
* @param propertyName
* @return
*/
public String getPropertyAsString(String propertyName) {
return getPropertyAsString(propertyName, null);
}
/**
* 获取Int类型的文件属性值
* @param propertyName
* @param defaultValue 默认值
* @return
*/
public int getPropertyAsInt(String propertyName, int defaultValue) {
try {
if (this.properties == null) {
loadProperties();
}
String sProperty = this.properties.getProperty(propertyName);
return Integer.parseInt(sProperty);
} catch (Exception e) {
log.error(propertyName + "属性文件读取错误" + e.getMessage(), e);
}
return defaultValue;
}
/**
* 获取Int类型的文件属性值
* @param propertyName
* @return
*/
public int getPropertyAsInt(String propertyName) {
return getPropertyAsInt(propertyName, 0);
}
/**
* 修改文件属性值
* @param propertyName 属性名
* @param propertyValue 属性值
*/
public void setProperty(String propertyName, String propertyValue) {
try {
if (this.properties == null) {
loadProperties();
}
String filePath = String.valueOf(this.oClassLoader.getResource("")) + this.propertyFileName + ".properties";
filePath = filePath.replaceAll("file:/", "");
filePath = filePath.replaceAll("%20", " ");
if (filePath.indexOf(":") != 1) {
filePath = File.separator + filePath;
}
OutputStream fos = new FileOutputStream(filePath);
properties.setProperty(propertyName, propertyValue);
properties.store(fos, "Update ‘" + propertyName + "‘ value");
if (fos != null) {
fos.close();
}
fos = null;
} catch (Exception e) {
log.error(propertyName + "属性文件更新错误" + e.getMessage(), e);
}
}
public static void main(String[] args) {
PropertiesUtil.getInstance("system_config").setProperty("IS_ZHUCE", "no");
System.out.println(">>>>>" + PropertiesUtil.getInstance("system_config").getPropertyAsString("IS_ZHUCE"));
}
}本文出自 “ciyo技术分享” 博客,请务必保留此出处http://ciyorecord.blog.51cto.com/6010867/1939386
标签:单例模式 properties propertiesutil 配置文件
原文地址:http://ciyorecord.blog.51cto.com/6010867/1939386