PS: 没找到合适的海报背景，就随便找了一张，使用技术都是相同的

1. 添加依赖

这俩其实跟本章节的核心技术没有关系，是为了获取QQ昵称和QQ头像而引入的。

org.jsoup

jsoup

1.11.3

com.alibaba

fastjson

1.2.54

talk is cheap， show me the code

2.上代码

我就不多说了，注释已经写得很清楚了

package com.pibgstar.demo.utils;

import com.alibaba.fastjson.JSONObject;

import org.jsoup.Jsoup;

import org.jsoup.nodes.Document;

import javax.imageio.ImageIO;

import java.awt.*;

import java.awt.geom.Ellipse2D;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.net.URL;

/**

* @author pibigstar

* @desc 海报生成工具

**/

public class PosterUtil {

private static final String BACKGROUND_IMG = "images/bg.jpg"; // 背景图片

private static final String result_img = "D:/tmp/images/result.jpg"; // 最终输出图片

private static final String QQ = "741047261";

private static final String avatar_img = "http://q1.qlogo.cn/g?b=qq&nk="+QQ+"&s=100";//QQ获取头像接口

private static final String signature = "魔前一叩三千年，回首凡尘不做仙。"; // 个性签名

public static void main(String[] args){

drawPoster();

}

/**

* @Author:pibigstar

* @Description: 画海报

*/

public static void drawPoster(){

try {

long startTime = System.currentTimeMillis();

// 1. 创建画布

BufferedImage backgroundImg = ImageIO.read(getInputStream(BACKGROUND_IMG));

BufferedImage canvas = new BufferedImage(backgroundImg.getWidth(),backgroundImg.getHeight(),BufferedImage.TYPE_INT_RGB);

Graphics2D g = (Graphics2D) canvas.getGraphics();

// 设置抗锯齿

g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HRGB);

// 2. 将头像设置为圆角

BufferedImage avatar = ImageIO.read(new URL(avatar_img));

BufferedImage newAvatar = new BufferedImage(avatar.getWidth(), avatar.getHeight(), BufferedImage.TYPE_INT_ARGB);

Ellipse2D.Double shape = new Ellipse2D.Double(0, 0, avatar.getWidth(), avatar.getHeight());

Graphics2D g2 = newAvatar.createGraphics();

newAvatar = g2.getDeviceConfiguration().createCompatibleImage(avatar.getWidth(), avatar.getHeight(), Transparency.TRANSLUCENT);

g2 = newAvatar.createGraphics();

g2.setComposite(AlphaComposite.Clear);

g2.fill(new Rectangle(newAvatar.getWidth(), newAvatar.getHeight()));

g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, 1.0f));

g2.setClip(shape);

// 使用 setRenderingHint 设置抗锯齿

g2 = newAvatar.createGraphics();

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

g2.fillRoundRect(0, 0,avatar.getWidth(), avatar.getHeight(), 150, 150);

g2.setComposite(AlphaComposite.SrcIn);

g2.drawImage(avatar, 0, 0, avatar.getWidth(), avatar.getHeight(), null);

g2.dispose();

// 3. 将背景图和头像结合

// 画背景

g.drawImage(backgroundImg.getScaledInstance(backgroundImg.getWidth(), backgroundImg.getHeight(), Image.SCALE_DEFAULT), 0, 0, null);

// 背景上画头像

g.drawImage(newAvatar.getScaledInstance(100, 100, Image.SCALE_DEFAULT), 42, 35, null);

// 4. 写字(昵称)

g.setColor(new Color(33, 33, 33, 128));

g.setFont(getFont(2, 32.0f));

g.drawString(getNickName(QQ), 200, 75);

// 5. 画个性签名

g.setColor(new Color(33, 33, 33, 128));

g.setFont(getFont(1, 40.0f));

// 画竖着的文字

int x = 240; // 起始位置

int length = signature.length();//字符总长度

int size = length/2; //一竖列的长度

int j = 0; // 读取到那个字符了

for (int i=0; i<2; i++) {//两竖列

int y = 300;

for (;j < size; j++) {

String c = String.valueOf(signature.charAt(j));

y += 40;

g.drawString(c,x,y);

}

size = length;

x += 70;//竖列之间的距离

}

g.dispose();

File resultImg = new File(result_img);

ImageIO.write(canvas, "png", resultImg);

System.out.println("生成成功！");

System.out.println("耗时: " + (System.currentTimeMillis()-startTime)/1000.0 + "s");

System.out.println("生成文件路径: " + resultImg.getAbsolutePath());

}catch (Exception e) {

e.printStackTrace();

}

}

/**

* @Description: 获取QQ昵称，无意间发现的QQ音乐的一个漏洞

*/

private static String getNickName(String qq){

String api = "https://c.y.qq.com/rsc/fcgi-bin/fcg_get_profile_homepage.fcg?cid=205360838&ct=20&userid="+qq+"&reqfrom=1";

String nick = "";

JSONObject creatorObject = null;

try {

Document document = Jsoup.connect(api).ignoreContentType(true).timeout(10000).get();

String body = document.body().text();

JSONObject jsonObject = JSONObject.parseObject(body);

JSONObject dataObject = (JSONObject) jsonObject.get("data");

creatorObject = (JSONObject) dataObject.get("creator");

nick = creatorObject.get("nick").toString();

}catch (Exception e) {

e.printStackTrace();

}

return nick;

}

/**

* 根据字体类型获取字体

* @param type 字体类型

* @param size 字体大小

*/

private static Font getFont(int type, float size) {

// 字体路径

String path;

switch (type) {

case 1:

path = "ttf/JianTi.ttf";

break;

case 2:

path = "ttf/PingFang.ttf";

break;

default:

path = "ttf/JianTi.ttf";

}

InputStream inputStream = null;

try {

inputStream = getInputStream(path);

Font font = Font.createFont(Font.TRUETYPE_FONT, inputStream);

font = font.deriveFont(size);

return font;

} catch (FontFormatException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

if (inputStream != null) {

inputStream.close();

}

} catch (Exception e) {

e.printStackTrace();

}

}

return null;

}

/**

* 获取resources下的文件输入流

*/

private static InputStream getInputStream(String fileName) {

return PosterUtil.class.getClassLoader().getResourceAsStream(fileName);

}

}

3. 目录结构

4. 最终效果