怎么样读取tomcat 下的properties文件
我的文件放是C:\Program Files (x86)\Apache Software Foundation\Tomcat 7.0\webapps\test\WEB-INF\classes\db.properties,在程序中怎么样读取它呢？我说的web应用下的东西,不是java project下的。求高手相助。谢谢

------解决方案--------------------
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import junit.framework.TestCase;

public class Debug extends TestCase
{
public void test() throws Exception
{
//1.从外部jar包文件读取配置文件内容:
//假设存在文件: E:/apache-tomcat-6.0.18/webapps/ROOT/WEB-INF/lib/log4j-1.2.16.jar
//你可以这样读出jar包中的org/apache/log4j/xml/log4j.dtd文件的内容;
byte[] data1 = readResource("E:/apache-tomcat-6.0.18/webapps/ROOT", "log4j-1.2.16.jar:org/apache/log4j/xml/log4j.dtd");
System.out.println("E:/apache-tomcat-6.0.18/webapps/ROOT/WEB-INF/lib/log4j-1.2.16.jar包里的org/apache/log4j/xml/log4j.dtd内容如下: ");
System.out.println(new String(data1));
System.out.println();
System.out.println();

//2.从classes路径读取配置文件内容:
//假设存在文件: E:/apache-tomcat-6.0.18/webapps/ROOT/WEB-INF/classes/conf/log4j.properties,
//你可以这样读出/conf/log4j.properties文件的内容;
byte[] data2 = readResource("E:/apache-tomcat-6.0.18/webapps/ROOT", "/conf/log4j.properties");
System.out.println("E:/apache-tomcat-6.0.18/webapps/ROOT/WEB-INF/classes/conf/log4j.properties的内容如下: ");
System.out.println(new String(data2));

}

/**
* 从外部jar包或classes类路径下读取配置文件
* @param applicationRootPath Web应用目录
* @param className jar包及其资源文件相对路径或classes类路径下配置文件的相对路径
* @return 配置文件的2进制内容
*/
public static byte[] readResource(String applicationRootPath, String className)
{
String[] classNames = className.split(":");
if (classNames[0].endsWith(".jar"))
{
if (classNames.length == 1)
{
String jarFilePath = applicationRootPath + File.separator + "WEB-INF" + File.separator + "lib" + File.separator + classNames[0];
return readResourceOfFile(jarFilePath);
}

String jarFilePath = applicationRootPath + File.separator + "WEB-INF" + File.separator + "lib" + File.separator + classNames[0];
return readResourceFromJar(jarFilePath, classNames[1]);
}

String classesFilePath = applicationRootPath + File.separator + "WEB-INF" + File.separator + "classes" + File.separator + classNames[0];
return readResourceOfFile(classesFilePath);
}

private static byte[] readResourceOfFile(String className)
{
byte[] arr_result = null;
InputStream in = null;
ByteArrayOutputStream fout = new ByteArrayOutputStream(8192);
try
{
in = new FileInputStream(className);
BufferedInputStream fin = new BufferedInputStream(in, 8192);

byte[] data = new byte[8192];
int count = 0;

while (count >= 0)
{
count = fin.read(data);
if (count > 0)
{
fout.write(data, 0, count);
}
}

arr_result = fout.toByteArray();
} catch (Exception e)
{
e.printStackTrace();
} finally
{
if (in != null)try{in.close();} catch (Exception ex){}
if (fout != null)try{fout.close();} catch (Exception ex){}
}

return arr_result;
}

private static byte[] readResourceFromJar(String jarFile, String className)
{
byte[] arr_result = null;
try
{
ZipFile zipFile = new ZipFile(jarFile);
try
{
ZipEntry zipEntry = zipFile.getEntry(className);
if (zipEntry == null)return null;
BufferedInputStream fi