Java文字描边效果实现

效果：

FontUtil工具类的完整代码如下：

其中实现描边效果的函数为：generateAdaptiveStrokeFontImage()

package com.ncarzone.data.contentcenter.biz.img.util;

import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import sun.font.FontDesignMetrics;

import java.awt.*;
import java.awt.font.FontRenderContext;
import java.awt.font.TextLayout;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.InputStream;

/**
 * 字体处理工具类
 */
public class FontUtil {
    public static String TTF_ZHIZUN = "ZHIZUN"; // 至尊体
    public static String TTF_BIAOTIHEI = "BIAOTIHEI"; // 标题黑

   
    /**
     * 自适应方式的文字转描边的艺术字图片
     * @param text 文本内容
     * @param fontTTFName 字体名称
     * @param fontWeight 字体大小
     * @param fontColor 字体颜色
     * @param isItalic 是否倾斜
     * @return 字体图片信息
     */
    public static BufferedImage generateAdaptiveStrokeFontImage(String text, String fontTTFName, float fontWeight,
                                                                Color fontColor, boolean isItalic){
        //字体加载以及设置
        Font font = loadFont(fontTTFName, fontWeight, isItalic);

        int textWidth = new Double(getWordFontWidth(font, text) * 1.06).intValue();  // 考虑倾斜的影响，稍微增加长度
        int textHeight = getFontHeight(font);

        BufferedImage bi = new BufferedImage(textWidth, textHeight, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = (Graphics2D) bi.getGraphics();

        // 增加下面代码使得背景透明
        bi = g2d.getDeviceConfiguration().createCompatibleImage(textWidth, textHeight, Transparency.TRANSLUCENT);
        g2d.dispose();

        g2d = (Graphics2D) bi.getGraphics();
        //消除锯齿
        ImageUtil.antialiasing(g2d);

        FontRenderContext frc = g2d.getFontRenderContext();
        TextLayout tl = new TextLayout(text, font, frc);
        Shape sha = tl.getOutline(AffineTransform.getTranslateInstance(0,fontWeight));

        g2d.setStroke(new BasicStroke((float)(fontWeight * 0.1)));
        g2d.setColor(Color.BLACK);
        g2d.draw(sha);
        g2d.setColor(fontColor);
        g2d.fill(sha);
        g2d.dispose();

        return bi;
    }

    /**
     * 加载字体
     * @param fontTTFName 字体名称
     * @param fontWeight 字体大小
     * @param isItalic 字体是否倾斜
     * @return
     */
    public static Font loadFont(String fontTTFName, float fontWeight, boolean isItalic){
        //字体加载以及设置
        Font font = null;
        try {
            Resource fontResource = new ClassPathResource("fonts/" + fontTTFName + ".TTF");
            InputStream inputStream = fontResource.getInputStream();
            Font f = Font.createFont(Font.TRUETYPE_FONT, inputStream);
            if( isItalic ){
                font = f.deriveFont(Font.PLAIN, fontWeight).deriveFont(AffineTransform.getShearInstance(-0.18, 0));
            }else{
                font = f.deriveFont(Font.PLAIN, fontWeight);
            }

        }catch (IOException | FontFormatException e){
            e.printStackTrace();
        }

        return font;
    }

    /**
     * 计算文字占用的字体宽度总和
     * @param font   字体
     * @param content 文字
     * @return
     */
    public static int getWordFontWidth(Font font, String content){
        FontDesignMetrics metrics = FontDesignMetrics.getMetrics(font);
        int width = 0;
        for( int i = 0; i < content.length(); i++ ){
            width += metrics.charWidth(content.charAt(i));
        }
        return width;
    }

    /**
     * 获取字体的高度
     * @param font
     * @return
     */
    public static int getFontHeight(Font font){
        FontDesignMetrics metrics = FontDesignMetrics.getMetrics(font);
        int height = metrics.getHeight();
        return height;
    }
}

消除锯齿函数的代码如下：

// 消除锯齿
    public static void antialiasing(Graphics2D g2d){
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
        g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
    }

测试代码如下：

BufferedImage bi = FontUtil.generateAdaptiveStrokeFontImage("中秋节快乐", "BIAOTIHEI", 300, Color.WHITE, true);
ImageUtil.storeImg2LocalStorage(bi, "font", 3);

其中保存测试图片的代码为：

// 保存图片到本地
    public static void storeImg2LocalStorage(BufferedImage bi, String name, int i){
        try{
            ImageIO.write(bi, "png", new File("D:\\temp\\image\\output\\" + name + i + ".png"));
        }catch (IOException e){
            e.printStackTrace();
        }
    }