TO: ..........qsc800528 (星空)..................

[swoky]

刚才打开你上次发的那个贴子，http://community.csdn.net/Expert/topic/5736/5736360.xml?temp=.7402002
你说
....需要传request进到这个类里来,又不是Action很不情愿传过来的......
本来想在那里给予你回复的，可是你却结了,只好这样了
刚找了下我以前写的，整理了一下，对jar和class文件都有效,希望对你有帮助
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/**
* @author swoky
* @time 2007-8-31 21:12:39
*/
public class WebRoot {
/**
*这个随你写在哪里.当然不一定就是"WEB-INF"来做判断的,以后调用这个涵数就可以了
*/
public String getWebRoot(){

String path = getClassPath(WebRoot.class);

return path.substring(0,path.indexOf("WEB-INF")-1);

}

/**
* 获取class文件的绝对路径
*/
private String getClassPath(Class cls) {

String path = null;

java.net.URL url = getClassLocationURL(cls);

if (url != null) {

path = url.getPath();

if ("jar".equalsIgnoreCase(url.getProtocol())) {

try {

path = new java.net.URL(path).getPath();

} catch (Exception e) {

System.out.print("获取class文件的绝对路径出错:" + e.getMessage());

}

int location = path.indexOf("!/");

if (location != -1) {

path = path.substring(0, location);

}
}

try {

java.io.File file = new java.io.File(path);

path = file.getCanonicalPath();

} catch (Exception ex) {

System.out.print("获取class文件的绝对路径出错:" + ex.getMessage());

}

}

return pathChange(path);

}

/**
* 获取class文件位置的URL
*/
private java.net.URL getClassLocationURL(final Class cls) {

java.net.URL result = null;

String clsAsResource = cls.getName().replace('.', '/').concat(".class");

java.security.ProtectionDomain pd = cls.getProtectionDomain();

if (pd != null) {

java.security.CodeSource cs = pd.getCodeSource();

if (cs != null)

result = cs.getLocation();

if (result != null) {

if ("file".equals(result.getProtocol())) {

try {

if (result.toExternalForm().endsWith(".jar")

|| result.toExternalForm().endsWith(".zip"))

result = new java.net.URL("jar:".concat(
result.toExternalForm()).concat("!/")

.concat(clsAsResource));

else if (new java.io.File(result.getFile())
.isDirectory())

result = new java.net.URL(result, clsAsResource);

} catch (Exception ex) {

System.out.print("取得路径出错:" + ex.getMessage());

}

}

}

}

if (result == null) {

ClassLoader clsLoader = cls.getClassLoader();

result = clsLoader != null ? clsLoader.getResource(clsAsResource)

: ClassLoader.getSystemResource(clsAsResource);

}

return result;
}

/**
* 将"\"转变"/",用于路径转换,可有可无，只是为了好看点
*/
private String pathChange(String befstr) {

StringBuffer afStr = new StringBuffer();

for (int i = 0; i < befstr.length(); i++) {

if ((befstr.charAt(i)) == '\\')

afStr.append(String.valueOf('/'));

else

afStr.append(befstr.substring(i, i + 1));

}

return afStr.toString();
}

}
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