Property文件读取的Util类

    Property文件以字符串形式保存数据。

这个类可以从Property文件中读取各种转换后的常见对象，可以继续扩展。



<textarea cols="50" rows="15" name="code" class="java">package com.arui.util;
import java.io.File;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;
import java.util.TimeZone;
public class PropertiesUtil extends Properties {
private static final long serialVersionUID = -1810519669397594359L;
/**
* Default constructor.
*/
public PropertiesUtil() {
}
/**
* Load existing property.
*/
public PropertiesUtil(final Properties prop) {
super(prop);
}
/**
* Get boolean value.
*/
public boolean getBoolean(final String str) throws Exception {
String prop = getProperty(str);
if (prop == null) {
throw new Exception(str + " not found");
}
return prop.toLowerCase().equals("true");
}
/**
* Get boolean value.
*/
public boolean getBoolean(final String str, final boolean bol) {
try {
return getBoolean(str);
} catch (Exception ex) {
return bol;
}
}
/**
* Get integer value.
*/
public int getInteger(final String str) throws Exception {
String value = getProperty(str);
if (value == null) {
throw new Exception(str + " not found");
}
try {
return Integer.parseInt(value);
} catch (NumberFormatException ex) {
throw new Exception("PropertiesUtil.getInteger()", ex);
}
}
/**
* Get integer value.
*/
public int getInteger(final String str, final int intVal) {
try {
return getInteger(str);
} catch (Exception ex) {
return intVal;
}
}
/**
* Get long value.
*/
public long getLong(final String str) throws Exception {
String value = getProperty(str);
if (value == null) {
throw new Exception(str + " not found");
}
try {
return Long.parseLong(value);
} catch (NumberFormatException ex) {
throw new Exception("PropertiesUtil.getLong()", ex);
}
}
/**
* Get long value.
*/
public long getLong(final String str, final long val) {
try {
return getLong(str);
} catch (Exception ex) {
return val;
}
}
/**
* Get double value.
*/
public double getDouble(final String str) throws Exception {
String value = getProperty(str);
if (value == null) {
throw new Exception(str + " not found");
}
try {
return Double.parseDouble(value);
} catch (NumberFormatException ex) {
throw new Exception("PropertiesUtil.getDouble()", ex);
}
}
/**
* Get double value.
*/
public double getDouble(final String str, final double doubleVal) {
try {
return getDouble(str);
} catch (Exception ex) {
return doubleVal;
}
}
/**
* Get <code>InetAddress</code>.
*/
public InetAddress getInetAddress(final String str) throws Exception {
String value = getProperty(str);
if (value == null) {
throw new Exception(str + " not found");
}
try {
return InetAddress.getByName(value);
} catch (UnknownHostException ex) {
throw new Exception("Host " + value + " not found");
}
}
/**
* Get <code>InetAddress</code>.
*/
public InetAddress getInetAddress(final String str, final InetAddress addr) {
try {
return getInetAddress(str);
} catch (Exception ex) {
return addr;
}
}
/**
* Get <code>String</code>.
*/
public String getString(final String str) throws Exception {
String value = getProperty(str);
if (value == null) {
throw new Exception(str + " not found");
}
return value;
}
/**
* Get <code>String</code>.
*/
public String getString(final String str, final String s) {
try {
return getString(str);
} catch (Exception ex) {
return s;
}
}
/**
* Get <code>File</code> object.
*/
public File getFile(final String str) throws Exception {
String value = getProperty(str);
if (value == null) {
throw new Exception(str + " not found");
}
return new File(value);
}
/**
* Get <code>File</code> object.
*/
public File getFile(final String str, final File fl) {
try {
return getFile(str);
} catch (Exception ex) {
return fl;
}
}
/**
* Get <code>Class</code> object
*/
public Class<?> getClass(final String str) throws Exception {
String value = getProperty(str);
if (value == null) {
throw new Exception(str + " not found");
}
try {
return Class.forName(value);
} catch (ClassNotFoundException ex) {
throw new Exception("PropertiesUtil.getClass()", ex);
}
}
/**
* Get <code>Class</code> object
*/
public Class<?> getClass(final String str, final Class<?> cls) {
try {
return getClass(str);
} catch (Exception ex) {
return cls;
}
}
/**
* Get <code>TimeZone</code>
*/
public TimeZone getTimeZone(final String str) throws Exception {
String value = getProperty(str);
if (value == null) {
throw new Exception(str + " not found");
}
return TimeZone.getTimeZone(value);
}
/**
* Get <code>TimeZone</code>
*/
public TimeZone getTimeZone(final String str, final TimeZone tz) {
try {
return getTimeZone(str);
} catch (Exception ex) {
return tz;
}
}
/**
* Get <code>DateFormat</code> object.
*/
public SimpleDateFormat getDateFormat(final String str) throws Exception {
String value = getProperty(str);
if (value == null) {
throw new Exception(str + " not found");
}
try {
return new SimpleDateFormat(value);
} catch (IllegalArgumentException e) {
throw new Exception("Date format was incorrect: " + value, e);
}
}
/**
* Get <code>DateFormat</code> object.
*/
public SimpleDateFormat getDateFormat(final String str,
final SimpleDateFormat fmt) {
try {
return getDateFormat(str);
} catch (Exception ex) {
return fmt;
}
}
/**
* Get <code>Date</code> object.
*/
public Date getDate(final String str, final DateFormat fmt)
throws Exception {
String value = getProperty(str);
if (value == null) {
throw new Exception(str + " not found");
}
try {
return fmt.parse(value);
} catch (ParseException ex) {
throw new Exception("PropertiesUtil.getdate()", ex);
}
}
/**
* Get <code>Date</code> object.
*/
public Date getDate(final String str, final DateFormat fmt, final Date dt) {
try {
return getDate(str, fmt);
} catch (Exception ex) {
return dt;
}
}
/**
* Set boolean value.
*/
public void setProperty(final String key, final boolean val) {
setProperty(key, String.valueOf(val));
}
/**
* Set integer value.
*/
public void setProperty(final String key, final int val) {
setProperty(key, String.valueOf(val));
}
/**
* Set double value.
*/
public void setProperty(final String key, final double val) {
setProperty(key, String.valueOf(val));
}
/**
* Set float value.
*/
public void setProperty(final String key, final float val) {
setProperty(key, String.valueOf(val));
}
/**
* Set long value.
*/
public void setProperty(final String key, final long val) {
setProperty(key, String.valueOf(val));
}
/**
* Set <code>InetAddress</code>.
*/
public void setInetAddress(final String key, final InetAddress val) {
setProperty(key, val.getHostAddress());
}
/**
* Set <code>File</code> object.
*/
public void setProperty(final String key, final File val) {
setProperty(key, val.getAbsolutePath());
}
/**
* Set <code>DateFormat</code> object.
*/
public void setProperty(final String key, final SimpleDateFormat val) {
setProperty(key, val.toPattern());
}
/**
* Set <code>TimeZone</code> object.
*/
public void setProperty(final String key, final TimeZone val) {
setProperty(key, val.getID());
}
/**
* Set <code>Date</code> object.
*/
public void setProperty(final String key, final Date val,
final DateFormat fmt) {
setProperty(key, fmt.format(val));
}
/**
* Set <code>Class</code> object.
*/
public void setProperty(final String key, final Class<?> val) {
setProperty(key, val.getName());
}
}
</textarea>