Java画图 给图片底部添加文字标题

需求给图片底部添加文字编号

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.RenderingHints;

import java.awt.font.FontRenderContext;

import java.awt.geom.Rectangle2D;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

/**

* JAVA 画图(生成文字水印)

*

* @author 杰宝宝

*

*/

public class ImageUtil {

/**

* @param str

* 生产的图片文字

* @param oldPath

* 原图片保存路径

* @param newPath

* 新图片保存路径

* @param width

* 定义生成图片宽度

* @param height

* 定义生成图片高度

* @return

* @throws IOException

*/

public void create(String str, String oldPath, String newPath, int width, int height){

try {

File oldFile = new File(oldPath);

Image image = ImageIO.read(oldFile);

File file = new File(newPath);

BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

Graphics2D g2 = bi.createGraphics();

g2.setBackground(Color.WHITE);

g2.clearRect(0, 0, width, height);

g2.drawImage(image, 0, 0, width - 25, height - 25, null); //这里减去25是为了防止字和图重合

/** 设置生成图片的文字样式 * */

Font font = new Font("黑体", Font.BOLD, 25);

g2.setFont(font);

g2.setPaint(Color.BLACK);

/** 设置字体在图片中的位置 在这里是居中* */

FontRenderContext context = g2.getFontRenderContext();

Rectangle2D bounds = font.getStringBounds(str, context);

double x = (width - bounds.getWidth()) / 2;

//double y = (height - bounds.getHeight()) / 2; //Y轴居中

double y = (height - bounds.getHeight());

double ascent = -bounds.getY();

double baseY = y + ascent;

/** 防止生成的文字带有锯齿 * */

g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

/** 在图片上生成文字 * */

g2.drawString(str, (int) x, (int) baseY);

ImageIO.write(bi, "jpg", file);

} catch (IOException e) {

e.printStackTrace();

}

}

public static void main(String[] args) {

try {

ImageUtil img = new ImageUtil();

img.create("编号：0011", "E:\\111.png", "E:\\222.png", 455, 455);

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

原图：

image.png

生成后：

image.png