使用graphics2D给图片上画字符

//读取图片
BufferedImage frontImage = ImageIO.read(name));
Graphics2D frontG = frontImage.createGraphics();
frontG.dispose();
frontImage.flush();
//给图片画数据，eCardForm为图片中fields的模板类
private void setFormInformation(eCardForm eForm, Graphics2D g, DataSet ds)throws IOException{
   Font plainFont = new Font(eForm.getFontType(), Font.LAYOUT_LEFT_TO_RIGHT, eForm.getFontSize());
   String drawString = null ;
   if(TypeChecker.isTrue(eForm.isConstant())){
            drawString = eForm.getValue().trim();
        }
        else{
            try{
               drawString = ds.getString(eForm.getValue()).trim();
            }
            catch(Exception e){
                return ;
            }
        }
 
        //check value
        if(TypeChecker.isEmpty(drawString)){
            return ;
        }
 
        if(TypeChecker.isTrue(eForm.getImage()) ) {
            if(TypeChecker.isTrue(drawString)){
                String eCardColor = ds.getString("CARDCOLOR");
                String MedpassLogo = eCardXMLConfigManager.geteCardXMLConfigManager().getRealPath()+ "/com."+suffix ;
                if(!TypeChecker.isEmpty(eCardColor) && eCardColor.equalsIgnoreCase("eCARDCOLOR.Red")){
                    MedpassLogo = eCardXMLConfigManager.geteCardXMLConfigManager().getRealPath()+ "/com."+suffix ;
                }
                Image imagewritted = ImageIO.read(new File(MedpassLogo));
                g.drawImage(imagewritted,eForm.getxPosition(), eForm.getyPosition(), eForm.getWidth(), eForm.getHeight(), null, null);
            }
               return ;
        }
 
        //color
        g.setColor(Color.BLACK);
        if(TypeChecker.isEmpty(eForm.getColor())){
            if(eForm.getColor().equals("red")){
                g.setColor(Color.BLACK);
            }
            else if(eForm.getColor().equals("blue")){
                g.setColor(Color.BLUE);
            }
            else if(eForm.getColor().equals("gray")){
                g.setColor(Color.GRAY);
            }
            else if(eForm.getColor().equals("yellow")){
                g.setColor(Color.YELLOW);
            }
            else if(eForm.getColor().equals("dark_gray")){
                g.setColor(Color.DARK_GRAY);
            }
            else if(eForm.getColor().equals("pink")){
                g.setColor(Color.PINK);
            }
        }
 
        AttributedString as = new AttributedString(drawString);
        as.addAttribute(TextAttribute.FONT, plainFont);
        
　　//设置加黑加粗属性weight,一直无法生效，没找到原因。
        if(TypeChecker.isTrue(eForm.isBold())){
            g.setFont(plainFont);
            Font boldFont = new Font(eForm.getFontType(), Font.BOLD, eForm.getFontSize());
            as.addAttribute(TextAttribute.FONT, boldFont);
            as.addAttribute(TextAttribute.WEIGHT, TextAttribute.WEIGHT_LIGHT);
            //as.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON);
        }
        if(TypeChecker.isTrue(eForm.isAlignRight())){
            as.addAttribute(TextAttribute.RUN_DIRECTION, TextAttribute.RUN_DIRECTION_RTL);
        }
        else{
            as.addAttribute(TextAttribute.RUN_DIRECTION, TextAttribute.RUN_DIRECTION_LTR);
        }
        if(TypeChecker.isTrue(eForm.isUnderLine())){
            as.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON);
        }
 
        //as.addAttribute(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON, 18, 25);
        int xPos = eForm.getxPosition();
//左右对齐
        if(TypeChecker.isTrue(eForm.isAlignRight())){
            g.setFont(plainFont);
            FontMetrics fm = g.getFontMetrics();
            Rectangle2D rc = fm.getStringBounds(drawString.trim(), g);
            xPos = eForm.getxPosition() - (int)(rc.getWidth());
             if(xPos < 0 ){
                xPos = 0;
            }
        }
//居中
        if(TypeChecker.isTrue(eForm.isAlignCenter())){
            g.setFont(plainFont);
            FontMetrics fm = g.getFontMetrics();
            Rectangle2D rc = fm.getStringBounds(drawString.trim(), g);
            xPos = Math.round((1130-(int)(rc.getWidth()))/2);
            if(xPos < 0 ){
                xPos = 0;
            }
        }
 
        int yxPos = eForm.getyPosition();
 
        g.drawString(as.getIterator(), xPos, yxPos);     
 
    }            

此方法主要是往图片的相应位置画数据。