package cn.jeesoft.core.util;
import java.io.File;
import java.io.FileInputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Properties;
/**
*
* 动态读取配置文件类
*
*
*
* @author MZ
*
*
*
* @Time 2009-11-24下午08:25:22
*/
public class UploadConfigurationRead {
/**
*
* 属性文件全名,需要的时候请重新配置PFILE
*/
private static String PFILE = "upload.properties";
/**
*
* 配置文件路径
*/
private URI uri = null;
/**
*
* 属性文件所对应的属性对象变量
*/
private long m_lastModifiedTime = 0;
/**
*
* 对应于属性文件的文件对象变量
*/
private File m_file = null;
/**
*
* 属性文件所对应的属性对象变量
*/
private Properties m_props = null;
/**
*
* 唯一实例
*/
private static UploadConfigurationRead m_instance = new UploadConfigurationRead();
/**
*
* 私有构造函数
*
*
*
* @throws URISyntaxException
*/
private UploadConfigurationRead() {
try {
m_lastModifiedTime = getFile().lastModified();
if (m_lastModifiedTime == 0) {
System.err.println(PFILE + "file does not exist!");
}
m_props = new Properties();
m_props.load(new FileInputStream(getFile()));
} catch (URISyntaxException e) {
System.err.println(PFILE + "文件路径不正确");
e.printStackTrace();
} catch (Exception e) {
System.err.println(PFILE + "文件读取异常");
e.printStackTrace();
}
}
/**
*
* 查找ClassPath路径获取文件
*
*
*
* @return File对象
*
* @throws URISyntaxException
*/
private File getFile() throws URISyntaxException {
URI fileUri = this.getClass().getClassLoader().getResource(PFILE)
.toURI();
m_file = new File(fileUri);
return m_file;
}
/**
*
* 静态工厂方法
*
*
*
* @return 返回ConfigurationRead的单一实例
*/
public synchronized static UploadConfigurationRead getInstance() {
return m_instance;
}
/**
*
* 读取一特定的属性项
*/
public String getConfigItem(String name, String defaultVal) {
long newTime = m_file.lastModified();
// 检查属性文件是否被修改
if (newTime == 0) {
// 属性文件不存在
if (m_lastModifiedTime == 0) {
System.err.println(PFILE + " file does not exist!");
} else {
System.err.println(PFILE + " file was deleted!!");
}
return defaultVal;
} else if (newTime > m_lastModifiedTime) {
m_props.clear();
try {
m_props.load(new FileInputStream(getFile()));
} catch (Exception e) {
System.err.println("文件重新读取异常");
e.printStackTrace();
}
}
m_lastModifiedTime = newTime;
String val = m_props.getProperty(name);
if (val == null) {
return defaultVal;
} else {
return val;
}
}
/**
*
* 读取一特定的属性项
*
*
*
* @param name
*
* 属性项的项名
*
* @return 属性项的值（如此项存在）， 空（如此项不存在）
*/
public String getConfigItem(String name) {
return getConfigItem(name, "");
}
}