java 生成 图片_java 生成文字图片的示例代码

import java.awt.Color;

import java.awt.Font;

import java.awt.FontMetrics;

import java.awt.Graphics;

import java.awt.Rectangle;

import java.awt.image.BufferedImage;

import java.io.File;

import javax.imageio.ImageIO;

public class FontImage {

public static void main(String[] args) throws Exception {

createImage("请A1003到3号窗口", new Font("宋体", Font.BOLD, 30), new File(

"e:/a.png"), 4096, 64);

createImage("请A1002到2号窗口", new Font("黑体", Font.BOLD, 35), new File(

"e:/a1.png"), 4096, 64);

createImage("请A1001到1号窗口", new Font("黑体", Font.PLAIN, 40), new File(

"e:/a2.png"), 4096, 64);

}

// 根据str,font的样式以及输出文件目录

public static void createImage(String str, Font font, File outFile,

Integer width, Integer height) throws Exception {

// 创建图片

BufferedImage image = new BufferedImage(width, height,

BufferedImage.TYPE_INT_BGR);

Graphics g = image.getGraphics();

g.setClip(0, 0, width, height);

g.setColor(Color.black);

g.fillRect(0, 0, width, height);// 先用黑色填充整张图片,也就是背景

g.setColor(Color.red);// 在换成黑色

g.setFont(font);// 设置画笔字体

/** 用于获得垂直居中y */

Rectangle clip = g.getClipBounds();

FontMetrics fm = g.getFontMetrics(font);

int ascent = fm.getAscent();

int descent = fm.getDescent();

int y = (clip.height - (ascent + descent)) / 2 + ascent;

for (int i = 0; i < 6; i++) {// 256 340 0 680

g.drawString(str, i * 680, y);// 画出字符串

}

g.dispose();

ImageIO.write(image, "png", outFile);// 输出png图片

}

}