added char stream copy.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@3903 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/Util.java

@@ -15,6 +15,8 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
+import java.io.Reader;
+import java.io.Writer;
 import java.net.InetAddress;
 import java.net.UnknownHostException;
 import java.security.DigestInputStream;
@@ -248,6 +250,13 @@ public class Util {
             out.write(buf,0,len);
     }
 
+    public static void copyStream(Reader in, Writer out) throws IOException {
+        char[] buf = new char[8192];
+        int len;
+        while((len=in.read(buf))>0)
+            out.write(buf,0,len);
+    }
+
     public static String[] tokenize(String s) {
         StringTokenizer st = new StringTokenizer(s);
         String[] a = new String[st.countTokens()];