I need generate a PDF file with some chinese chars, the main structure of my code likes that:

1. import processing.pdf.*;
   PFont myFont=createFont("微软雅黑",24,true);//微软雅黑 is the name of a chinese font.
   boolean recordPDF = false;
2. void setup(){
     size(640,480);
     smooth();
   }
3. void draw(){
     background(255);
     fill(0);
     textFont(myFont,48);
     textAlign(CENTER,CENTER);
     text("显示控制窗外框design",width/2,height/2);//to display both chinese and english chars.
   }
4. void keyReleased() {
     if (key =='r' || key =='R') {
       if (recordPDF == false) {
         beginRecord(PDF, timestamp()+".pdf");
         println("recording started");
         recordPDF = true;
       }
     }
     else if (key == 'e' || key =='E') {
       if (recordPDF) {
         println("recording stopped");
         endRecord();
         recordPDF = false;
       }
     }
   }
5. String timestamp() {
     Calendar now = Calendar.getInstance();
     return String.format("%1$ty%1$tm%1$td_%1$tH%1$tM%1$tS", now);
   }

Both chinese and english chars display correctly in the sketch window, but only english chars can be found in the final output PDF file, all the chinese chars lost.

So anyone can help me? thx a lot.