今天跟大佬學(xué)了JAVA隨機生成驗證碼，
開心Ing,,,,,
激動ing,,,
前臺html代碼
<div style="margin-top: 50px;">
<span>驗證碼：</span><input type="text" name="verifyCode" id="verifyCode" style="width: 75px;height: 25px;"/>
<img id="verifyCodeImg" alt="點擊更換" src="/qos/dog/getVerifyCodeImg"
title="點擊更換" onclick="change()">
</div>
前臺js代碼
function change() {
var verifyCode = document.getElementById("verifyCodeImg");
verifyCode.src = "/qos/dog/getVerifyCodeImg?time=" + Math.random(1000);
}
/*-*/
/qos/dog/ 這里的路徑是需要換成自己的哦
驗證代碼，在controller里面新建一個util文件夾，然后放入VerifyCodeUtil.java
代碼如下
package com.paladin.qos.util;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Random;
public class VerifyCodeUtil {
private static final Random random = new Random();
private static final String[] fontNames = {"宋體", "華文楷體", "黑體", "Georgia", "微軟雅黑", "楷體_GB2312"};
public static String drawImage(ByteArrayOutputStream output) {
String code = "";
int width = 50;
int height = 25;
//創(chuàng)建圖片緩沖區(qū)
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
Graphics2D g = bi.createGraphics();
//設(shè)置背景顏色
g.setBackground(new Color(255, 255, 255));
g.clearRect(0, 0, width, height);
StringBuilder stringBuilder = new StringBuilder();
//這里只畫入四個字符
for (int i = 0; i < 4; i++) {
String s = randomChar() + ""; //隨機生成字符，因為只有畫字符串的方法，沒有畫字符的方法，所以需要將字符變成字符串再畫
stringBuilder.Append(s); //添加到StringBuilder里面
float x = i * 1.0F * width / 4; //定義字符的x坐標(biāo)
g.setFont(randomFont()); //設(shè)置字體，隨機
g.setColor(randomColor()); //設(shè)置顏色，隨機
g.drawString(s, x, height - 5);
}
code = stringBuilder.toString();//獲取驗證碼字符串
//定義干擾線
//定義干擾線的數(shù)量（3-5條）int num = random.nextInt(max)%(max-min+1) + min;
int num = random.nextInt(5) % 3 + 3;
Graphics2D graphics = (Graphics2D) bi.getGraphics();
for (int i = 0; i < num; i++) {
int x1 = random.nextInt(width);
int y1 = random.nextInt(height);
int x2 = random.nextInt(width);
int y2 = random.nextInt(height);
graphics.setColor(randomColor());
graphics.drawLine(x1, y1, x2, y2);
}
// 釋放圖形上下文
g.dispose();
try {
ImageIO.write(bi, "jpg", output);
} catch (IOException e) {
e.printStackTrace();
}
return code;//為了方便取值，直接返回code，
}
//隨機字體
private static Font randomFont() {
int index = random.nextInt(fontNames.length);
String fontName = fontNames[index];
int style = random.nextInt(4); //隨機獲取4種字體的樣式
int size = random.nextInt(20) % 6 + 15; //隨機獲取字體的大小(10-20之間的值)
return new Font(fontName, style, size);
}
//隨機顏色
private static Color randomColor() {
int r = random.nextInt(225);
int g = random.nextInt(225);
int b = random.nextInt(225);
return new Color(r, g, b);
}
//隨機字符
private static char randomChar() {
//A-Z,a-z,0-9,可剔除一些難辨認的字母與數(shù)字
String str = "0123456789ABCdefghiDEFGHIJopPQRVWXYZabcjklSTUmnqrstKLMNOvuwxyz";
return str.charAt(random.nextInt(str.length()));
}
}
最后，在controller里面引用
@RequestMapping("/getVerifyCodeImg")
@ResponseBody
public void getVerifyCodeImg(HttpServletResponse response, HttpSession session) {
ByteArrayOutputStream output = new ByteArrayOutputStream();
String code = VerifyCodeUtil.drawImage(output);
//將驗證碼文本直接存放到session中
session.setAttribute("verifyCode", code);
try {
ServletOutputStream out = response.getOutputStream();
output.writeTo(out);
} catch (IOException e) {
e.printStackTrace();
}
}
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版權(quán)聲明：本文為CSDN博主「小仙女de成長」的原創(chuàng)文章，遵循 CC 4.0 BY-SA 版權(quán)協(xié)議，轉(zhuǎn)載請附上原文出處鏈接及本聲明。
原文鏈接：https://blog.csdn.net/qq_32963841/article/details/103182827
