java 使用Graphics2D在图片上写字

BufferedImage image = new BufferedImage(260, 80, BufferedImage.TYPE_INT_BGR);
//获取Graphics2D对象
Graphics2D graphics = image.createGraphics();
//开启文字抗锯齿
graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
//设置字体
Font font = new Font("Algerian", Font.ITALIC, 40);
graphics.setFont(font);
//向画板上写字
graphics.drawString("This is test!", 10, 60);
graphics.dispose();

package com.msw.test; 
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Polygon;
import java.awt.RenderingHints;
import java.awt.Stroke;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException; 
import javax.imageio.ImageIO;
 
public class MyTest {
    public static void main(String[] args) throws IOException {
        BufferedImage image = new BufferedImage(400, 500, BufferedImage.TYPE_INT_BGR);
        BufferedImage image2 = ImageIO.read(new FileInputStream(new File("F:\\2.jpg")));
        // 获取Graphics2D对象
        Graphics2D graphics = image.createGraphics();
        graphics.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION,RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
        //把image2设置为背景图片
        graphics.drawImage(image2, 0, 0, 400, 500,null);
        // 设置画笔
        Stroke stroke = new BasicStroke(5f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
        graphics.setStroke(stroke);
        // 设置颜色--绿色
        graphics.setColor(Color.GREEN);
        //画树
        graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        Polygon polygon = new Polygon();
        polygon.addPoint(200, 100);
        polygon.addPoint(180, 150);
        polygon.addPoint(220, 150);
        graphics.draw(polygon);
        polygon.reset();
        polygon.addPoint(200, 150);
        polygon.addPoint(160, 200);
        polygon.addPoint(240, 200);
        graphics.draw(polygon);
        polygon.reset();
        polygon.addPoint(200, 200);
        polygon.addPoint(140, 250);
        polygon.addPoint(260, 250);
        graphics.draw(polygon);
        polygon.reset();
        polygon.addPoint(180, 250);
        polygon.addPoint(180, 300);
        polygon.addPoint(220, 300);
        polygon.addPoint(220, 250);
        graphics.draw(polygon);
        graphics.dispose();
        File file = new File("F:\\1.jpg");
        file.createNewFile();
        FileOutputStream fos = new FileOutputStream(file);
        ImageIO.write(image, "jpg", fos);
        fos.close();
    }
}

public static int getWordWidth(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;
}

   FontDesignMetrics metrics = FontDesignMetrics.getMetrics(font);
   int height = metrics.getHeight();

graphics.drawString(content, 0, metrics.getAscent());

import sun.font.FontDesignMetrics; 
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.font.LineMetrics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
 
/**
 * Created by zengrenyuan on 18/5/11.
 */
public class ImageTest { 
    public static void main(String[] args) throws IOException {
        Font font = new Font("微软雅黑", Font.BOLD, 32);
        String content = "你好Java!";
        FontDesignMetrics metrics = FontDesignMetrics.getMetrics(font);
        int width = getWordWidth(font, content);//计算图片的宽
        int height = metrics.getHeight();//计算高
        BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D graphics = bufferedImage.createGraphics();
        graphics.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        graphics.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER));
        //设置背影为白色
        graphics.setColor(Color.WHITE);
        graphics.fillRect(0, 0, bufferedImage.getWidth(), bufferedImage.getHeight());
        graphics.setFont(font);
        graphics.setColor(Color.BLACK);
        graphics.drawString(content, 0, metrics.getAscent());//图片上写文字
        graphics.dispose();
        write(bufferedImage, "/data/test.png");  
    }
 
    public static int getWordWidth(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;
    }
 
    public static void write(BufferedImage bufferedImage, String target) throws IOException {
        File file = new File(target);
        if (!file.getParentFile().exists()) {
            file.getParentFile().mkdirs();
        }
        try (OutputStream os = new FileOutputStream(target)) {
            ImageIO.write(bufferedImage, "PNG", os);
        }
    } 
}