Java使用图片显示电子邮件地址

今天在逛oschina的时候看见里面有一个代码分享的功能还不错，红薯老大贴出了一段代码个人觉得很实用转出来分享下。 

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.awt.image.IndexColorModel;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.imageio.ImageIO;

/**
 * 根据文本生成图片的工具
 * @author Winter Lau
 * @date 2009-7-30 下午12:58:26
 */
public class TextImageUtils {

    private final static IndexColorModel icm = createIndexColorModel();

    static IndexColorModel createIndexColorModel() {
        BufferedImage ex = new BufferedImage(1, 1, BufferedImage.TYPE_BYTE_INDEXED);
        IndexColorModel icm = (IndexColorModel) ex.getColorModel();
        int SIZE = 256;
        byte[] r = new byte[SIZE];
        byte[] g = new byte[SIZE];
        byte[] b = new byte[SIZE];
        byte[] a = new byte[SIZE];
        icm.getReds(r);
        icm.getGreens(g);
        icm.getBlues(b);
        java.util.Arrays.fill(a, (byte)255);
        r[0] = g[0] = b[0] = a[0] = 0; //transparent
        return new IndexColorModel(8, SIZE, r, g, b, a);
    }

    /**
     * 生成电子邮件图片
     * @param email
     * @param out
     * @throws IOException
     */
    public static void MakeEmailImage(String email, OutputStream out) throws IOException {
        int height = 22;
        BufferedImage bi = new BufferedImage(255,height,BufferedImage.TYPE_INT_RGB);
        Graphics2D g = (Graphics2D)bi.getGraphics();
        Font mFont = new Font("Verdana", Font.PLAIN, 14);
        g.setFont(mFont);
        g.drawString(email, 2, 19);
        FontMetrics fm = g.getFontMetrics();
        int new_width = fm.charsWidth(email.toCharArray(), 0, email.length()) + 4;
        int new_height = fm.getHeight();
        BufferedImage nbi = new BufferedImage(new_width, new_height,
            BufferedImage.TYPE_BYTE_INDEXED, icm);
        Graphics2D g2 = (Graphics2D)nbi.getGraphics();
        g2.setColor(new Color(0,0,0,0));//透明
        g2.fillRect(0,0,new_width,new_height);
        g2.setFont(mFont);
        g2.setColor(new Color(200,0,0));
        g2.drawString(email, 2, new_height-4);

        ImageIO.write(nbi, "gif", out);
    }

    /**
     * 生成电话号码图片
     * @param phone
     * @param out
     * @throws IOException
     */
    public static void MakePhoneImage(String phone, OutputStream out) throws IOException {
        int height = 22;
        BufferedImage bi = new BufferedImage(255,height,BufferedImage.TYPE_INT_RGB);
        Graphics2D g = (Graphics2D)bi.getGraphics();
        Font mFont = new Font("Verdana", Font.BOLD, 20);
        g.setFont(mFont);
        g.drawString(phone, 2, 19);
        FontMetrics fm = g.getFontMetrics();
        int new_width = fm.charsWidth(phone.toCharArray(), 0, phone.length()) + 4;
        int new_height = fm.getHeight();
        BufferedImage nbi = new BufferedImage(new_width, new_height,
            BufferedImage.TYPE_BYTE_INDEXED, icm);
        Graphics2D g2 = (Graphics2D)nbi.getGraphics();
        g2.setColor(new Color(0,0,0,0));//透明
        g2.fillRect(0,0,new_width,new_height);
        g2.setFont(mFont);
        g2.setColor(new Color(200,0,0));
        g2.drawString(phone, 2, new_height-4);
        ImageIO.write(nbi, "gif", out);
    }
    /**
     * 生成产品关键特征
     * @param attribute
     * @param out
     * @throws IOException
     */
    public static void MakeProductAttribute(String attribute, OutputStream out) throws IOException{
        int height = 22;
        BufferedImage bi = new BufferedImage(255,height,BufferedImage.TYPE_INT_RGB);
        Graphics2D g = (Graphics2D)bi.getGraphics();
        Font mFont = new Font("宋体", Font.BOLD, 13);
        g.setFont(mFont);
        g.drawString(new String(attribute), 2, 19);
        FontMetrics fm = g.getFontMetrics();
        int new_width = fm.charsWidth(attribute.toCharArray(), 0, attribute.length()) + 4;
        int new_height = fm.getHeight();
        BufferedImage nbi = new BufferedImage(new_width, new_height,
           BufferedImage.TYPE_BYTE_INDEXED, icm);
        Graphics2D g2 = (Graphics2D)nbi.getGraphics();
        g2.setColor(new Color(0,0,0,0));//透明
        g2.fillRect(0,0,new_width,new_height);
        g2.setFont(mFont);
        g2.setColor(new Color(200,0,0));
        g2.drawString(attribute, 2, new_height-4);
        ImageIO.write(nbi, "gif", out);
    }

    public static void main(String[] args) throws IOException {
        String num = "020-85551111";
        FileOutputStream fos = new FileOutputStream("D:/phone.gif");
        try{
            MakePhoneImage(num, fos);
        }finally{
            fos.close();
        }
        String email = "[e-mail]";
        FileOutputStream fos2 = new FileOutputStream("D:/email.gif");
        try{
            MakeEmailImage(email, fos2);
        }finally{
            fos2.close();
        }
    }
}