客戶端 val dst urn 緩沖 color 內存 nco return

html

ajax


Controller


UserServiceImpl

驗證碼Controller

YzmServiceImpl

聲明Constant類

驗證碼util類
package com.xinbo.www.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import sun.misc.BASE64Encoder;
import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;

import java.util.HashMap;
import java.util.Map;
import java.util.Random;

public class RandomValidateCodeUtil {
public static final String RANDOMCODEKEY = "randomcode_key";//放到session中的key
private Random random = new Random();
private String randString = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";//隨機產生的字符串

private int width = 85;//圖片寬
private int height = 36;//圖片高
private int lineSize = 40;//幹擾線數量
private int stringNum = 4;//隨機產生字符數量

private static final Logger logger = LoggerFactory.getLogger(RandomValidateCodeUtil.class);

/**
 * 生成隨機圖片
 */
public Map<String,String> getRandcode() {
    // BufferedImage類是具有緩沖區的Image類,Image類是用於描述圖像信息的類
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
    Graphics g = image.getGraphics();// 產生Image對象的Graphics對象,改對象可以在圖像上進行各種繪制操作
    g.fillRect(0, 0, width, height);//圖片大小
    g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 18));//字體大小
    g.setColor(getRandColor(110, 133));//字體顏色
    // 繪制幹擾線
    for (int i = 0; i <= lineSize; i++) {
        drowLine(g);
    }
    // 繪制隨機字符
    String randomString = "";
    for (int i = 1; i <= stringNum; i++) {
        randomString = drowString(g, randomString, i);
    }

    logger.info(randomString);
    //將生成的隨機字符串保存到session中
    //session.removeAttribute(RANDOMCODEKEY);
    //session.setAttribute(RANDOMCODEKEY, randomString);
    g.dispose();
    String base64 = null;
    try {
        // 將內存中的圖片通過流動形式輸出到客戶端
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageIO.write(image, "JPEG", baos);//圖片格式

        byte[] bytes = baos.toByteArray();

        base64 =  new BASE64Encoder().encodeBuffer(bytes).trim();
    } catch (Exception e) {
        logger.error("將內存中的圖片通過流動形式輸出到客戶端失敗>>>>   ", e);
    }

    Map<String,String> map = new HashMap<String,String>();
    map.put("num", randomString);
    map.put("pic", base64);
    return map;
}

/*
 * 獲得字體
 */
private Font getFont(){
    return new Font("Fixedsys",Font.CENTER_BASELINE,18);
}
/*
 * 獲得顏色
 */
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);
}
/*
 * 繪制字符串
 */
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;
}
/*
 * 繪制幹擾線
 */
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);
}
/*
 * 獲取隨機的字符
 */
public String getRandomString(int num){
    return String.valueOf(randString.charAt(num));
}
 

}

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