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java 驗證碼生成

sewell85的頭像 sewell85 0 2016-03-09 21:46 9

 基本信息

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瀏覽數: 30805

分享時間: 2 年 前

27

驗證碼效果圖

import java.awt.Color;
import java.awt.Font;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import javax.imageio.ImageIO;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.math.RandomUtils;

import nl.captcha.Captcha;
import nl.captcha.Captcha.Builder;
import nl.captcha.gimpy.BlockGimpyRenderer;
import nl.captcha.text.producer.ChineseTextProducer;
import nl.captcha.text.producer.DefaultTextProducer;
import nl.captcha.text.renderer.DefaultWordRenderer;
import nl.captcha.text.renderer.WordRenderer;



public class CaptchaServlet extends HttpServlet implements Servlet {
	private static final long serialVersionUID = 1L;
	private static final String PARAM_HEIGHT = "height"; // 高度 默認為50

	private static final String PARAM_WIDTH = "width";// 寬度 默認為200

	private static final String PAEAM_NOISE = "noise";// 干擾線條 默認是沒有干擾線條

	private static final String PAEAM_TEXT = "text";// 文本

	protected int _width = 150;
	protected int _height = 40;
	protected boolean _noise = false;
	protected String _text = "number:1,word:1,number:1,number:1,word:1";

	/**
	 * 初始化過濾器.將配置文件的參數文件賦值
	 * 
	 * @throws ServletException
	 */
	@Override
	public void init() throws ServletException {
		if (getInitParameter(PARAM_HEIGHT) != null) {
			_height = Integer.valueOf(getInitParameter(PARAM_HEIGHT));
		}

		if (getInitParameter(PARAM_WIDTH) != null) {
			_width = Integer.valueOf(getInitParameter(PARAM_WIDTH));
		}

		if (getInitParameter(PAEAM_NOISE) != null) {
			_noise = Boolean.valueOf(getInitParameter(PAEAM_NOISE));
		}

		if (getInitParameter(PAEAM_NOISE) != null) {
			_text = String.valueOf(getInitParameter(PAEAM_TEXT));
		}
	}

	/**
	 * 因為獲取圖片只會有get方法
	 */
	@Override
	public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

		Builder builder = new Captcha.Builder(_width, _height);
		// 增加邊框
		// builder.addBorder();
		// 是否增加干擾線條
		if (_noise == true) {
			builder.addNoise();
		}
		// ----------------自定義字體大小-----------
		// 自定義設置字體顏色和大小 最簡單的效果 多種字體隨機顯示
		List<Font> fontList = new ArrayList<Font>();
		fontList.add(new Font("微軟 雅黑", Font.LAYOUT_NO_START_CONTEXT, 30));// 可以設置斜體之類的
		DefaultWordRenderer dwr = new DefaultWordRenderer(getRandomColor(), fontList);
		// 加入多種顏色后會隨機顯示 字體空心

		WordRenderer wr = dwr;
		// 增加文本,默認為5個隨機字符.
		if (_text == null) {
			builder.addText();
		} else {
			String[] ts = _text.split(",");
			for (int i = 0; i < ts.length; i++) {
				String[] ts1 = ts[i].split(":");
				if ("chinese".equals(ts1[0])) {
					builder.addText(new ChineseTextProducer(Integer.parseInt(ts1[1])), wr);
				} else if ("number".equals(ts1[0])) {
					// 這里沒有0和1是為了避免歧義 和字母I和O
					char[] numberChar = new char[] { '2', '3', '4', '5', '6', '7', '8' };
					builder.addText(new DefaultTextProducer(Integer.parseInt(ts1[1]), numberChar), wr);
				} else if ("word".equals(ts1[0])) {
					// 原理同上
					char[] numberChar = new char[] { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'k', 'm', 'n', 'p', 'r',
							'w', 'x', 'y' };
					builder.addText(new DefaultTextProducer(Integer.parseInt(ts1[1]), numberChar), wr);
				} else {
					builder.addText(new DefaultTextProducer(Integer.parseInt(ts1[1])), wr);
				}
			}

		}

		// --------------添加背景-------------
		// 設置背景漸進效果 以及顏色 form為開始顏色,to為結束顏色
		// GradiatedBackgroundProducer gbp=new GradiatedBackgroundProducer();
		// gbp.setFromColor(Color.yellow);
		// gbp.setToColor(Color.red);
		// 無漸進效果,只是填充背景顏色
		// FlatColorBackgroundProducer fbp=new
		// FlatColorBackgroundProducer(Color.red);
		// 加入網紋--一般不會用
		// SquigglesBackgroundProducer sbp=new SquigglesBackgroundProducer();
		// 沒發現有什么用,可能就是默認的
		// TransparentBackgroundProducer tbp = new
		// TransparentBackgroundProducer();

		// builder.addBackground(gbp);
		// ---------裝飾字體---------------
		// 字體邊框齒輪效果 默認是3
		builder.gimp(new BlockGimpyRenderer(1));
		// 波紋渲染 相當于加粗
		// builder.gimp(new RippleGimpyRenderer());
		// 修剪--一般不會用
		// builder.gimp(new ShearGimpyRenderer(Color.red));
		// 加網--第一個參數是橫線顏色,第二個參數是豎線顏色
		// builder.gimp(new FishEyeGimpyRenderer(Color.red,Color.yellow));
		// 加入陰影效果 默認3,75
		// builder.gimp(new DropShadowGimpyRenderer());
		// 創建對象
		Captcha captcha = builder.build();

		req.getSession().setAttribute("simpleCaptcha", captcha);
		resp.setHeader("Cache-Control", "private,no-cache,no-store");
		resp.setContentType("image/png");
		try {
			OutputStream os = resp.getOutputStream();
			ImageIO.write(captcha.getImage(), "png", os);
			os.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public Color getRandomColor() {
		int n = RandomUtils.nextInt(100);

		if (n % 3 == 1) {
			return Color.RED;
		} else if (n % 3 == 2) {
			return Color.BLUE;
		}
		return Color.GREEN;
	}
}




不錯的
2 年 前 dzqiang
nice
2 年 前 idiots
hao
1 年 前 s652651924

12 [下一頁]

  • yuzhao的頭像 yuzhao 2017-10-30 18:21 代碼數:0

    寫的不錯

  • cixexey的頭像 cixexey 2018-05-14 19:17 代碼數:0

    Very good points you wrote here..Great stuff...I think you've made some truly interesting points.Keep up the good work. click here

  • 指尖以東的頭像 指尖以東 2016-06-15 18:49 代碼數:0

    bucuo

  • 哈哈哈哈的頭像 哈哈哈哈 2016-07-17 10:57 代碼數:0

    受教了。。。

  • cixexey的頭像 cixexey 2018-08-05 19:57 代碼數:0

    I am very much pleased with the contents you have mentioned. I wanted to thank you for this great article.audio

  • cixexey的頭像 cixexey 2018-08-05 19:57 代碼數:0

    I really loved reading your blog. It was very well authored and easy to understand. Unlike other blogs I have read which are really not that good.Thanks alot! acim

  • cixexey的頭像 cixexey 2018-08-05 19:58 代碼數:0

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  • aslwq2012的頭像 aslwq2012 2016-08-17 22:11 代碼數:0

    nice

  • kael_zhang的頭像 kael_zhang 2016-08-27 22:34 代碼數:0

    回去試一下

  • 822280872的頭像 822280872 2017-10-12 10:08 代碼數:0

    不錯,很有意義

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