上传后台管理系统代码

2025-07-04 16:26:40 +00:00 · 2020-05-06 07:40:43 +08:00
parent 8ba73ed42b
commit ca9fd1c2f7
1182 changed files with 276446 additions and 0 deletions
--- a/novel-admin/src/main/java/com/java2nb/common/utils/RandomValidateCodeUtil.java
+++ b/novel-admin/src/main/java/com/java2nb/common/utils/RandomValidateCodeUtil.java
@ -0,0 +1,122 @@
+package com.java2nb.common.utils;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.imageio.ImageIO;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import javax.servlet.http.HttpSession;
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.util.Random;
+
+/**
+ * @author xiongxy
+ */
+public class RandomValidateCodeUtil {
+
+
+    public static final String RANDOMCODEKEY = "RANDOMVALIDATECODEKEY";//放到session中的key
+    private String randString = "0123456789";//随机产生只有数字的字符串 private String
+    //private String randString = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生只有字母的字符串
+    //private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//随机产生数字与字母组合的字符串
+    private int width = 95;// 图片宽
+    private int height = 25;// 图片高
+    private int lineSize = 40;// 干扰线数量
+    private int stringNum = 4;// 随机产生字符数量
+
+    private static final Logger logger = LoggerFactory.getLogger(RandomValidateCodeUtil.class);
+
+    private Random random = new Random();
+
+    /**
+     * 获得字体
+     */
+    private Font getFont() {
+        return new Font("Fixedsys", Font.CENTER_BASELINE, 18);
+    }
+
+    /**
+     * 获得颜色
+     */
+    private Color getRandColor(int fc, int bc) {
+        if (fc > 255) {
+            fc = 255;
+        }
+        if (bc > 255) {
+            bc = 255;
+        }
+        int r = fc + random.nextInt(bc - fc - 16);
+        int g = fc + random.nextInt(bc - fc - 14);
+        int b = fc + random.nextInt(bc - fc - 18);
+        return new Color(r, g, b);
+    }
+
+    /**
+     * 生成随机图片
+     */
+    public void getRandcode(HttpServletRequest request, HttpServletResponse response) {
+        HttpSession session = request.getSession();
+        // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
+        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
+        Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
+        g.fillRect(0, 0, width, height);//图片大小
+        g.setFont(new Font("Default", Font.ROMAN_BASELINE, 18));//字体大小
+        g.setColor(getRandColor(110, 133));//字体颜色
+        // 绘制干扰线
+        for (int i = 0; i <= lineSize; i++) {
+            drowLine(g);
+        }
+        // 绘制随机字符
+        String randomString = "";
+        for (int i = 1; i <= stringNum; i++) {
+            randomString = drowString(g, randomString, i);
+        }
+        logger.info(randomString);
+        //将生成的随机字符串保存到session中
+        session.removeAttribute(RANDOMCODEKEY);
+        session.setAttribute(RANDOMCODEKEY, randomString);
+        g.dispose();
+        try {
+            // 将内存中的图片通过流动形式输出到客户端
+            ImageIO.write(image, "JPEG", response.getOutputStream());
+        } catch (Exception e) {
+            logger.error("将内存中的图片通过流动形式输出到客户端失败>>>> ", e);
+        }
+
+    }
+
+    /**
+     * 绘制字符串
+     */
+    private String drowString(Graphics g, String randomString, int i) {
+        g.setFont(getFont());
+        g.setColor(new Color(random.nextInt(101), random.nextInt(111), random
+                .nextInt(121)));
+        String rand = String.valueOf(getRandomString(random.nextInt(randString
+                .length())));
+        randomString += rand;
+        g.translate(random.nextInt(3), random.nextInt(3));
+        g.drawString(rand, 13 * i, 16);
+        return randomString;
+    }
+
+    /**
+     * 绘制干扰线
+     */
+    private void drowLine(Graphics g) {
+        int x = random.nextInt(width);
+        int y = random.nextInt(height);
+        int xl = random.nextInt(13);
+        int yl = random.nextInt(15);
+        g.drawLine(x, y, x + xl, y + yl);
+    }
+
+    /**
+     * 获取随机的字符
+     */
+    public String getRandomString(int num) {
+        return String.valueOf(randString.charAt(num));
+    }
+}