使用java画一张海报

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。

<!-- jsoup -->
<dependency>
<groupId>org.jsoup</groupId>
<artifactId>jsoup</artifactId>
<version>1.11.3</version>
</dependency>
<!-- fastjson -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.54</version>
</dependency>

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