java生成动态gif格式与png格式的验证码(代码1)
2016-10-22 11:51
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Java代码
import java.awt.Color;
import java.awt.Font;
import java.io.OutputStream;
import java.util.Random;
/**
* 验证码抽象类,暂时不支持中文
* @author wzztestin
*
*/
public abstract class Captcha {
private static final Random random = new Random();
// 字体
protected Font font = new Font("Verdana", Font.ITALIC | Font.BOLD, 28);
// 默认宽度
protected int width = 150;
//默认高度
protected int height = 40;
//验证码串
private String yanzhenmastr = "";
//除数
private String onenum = "";
/**
* 生成随机颜色
* @param fc
* @param bc
* @return Color
*/
Color getRandColor(int fc, int bc) {
Random random = new Random();
if (fc > 255) {
fc = 255;
}
if (bc > 255) {
bc = 255;
}
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
/**
* 生成随机字体
* @return Font
*/
Font getRandomFont() {
String[] fonts = {"Georgia", "Verdana", "Arial", "Tahoma", "Time News Roman", "Courier New", "Arial Black", "Quantzite"};
int fontIndex = (int)Math.round(Math.random() * (fonts.length - 1));
int fontSize = 28;
return new Font(fonts[fontIndex], Font.PLAIN, fontSize);
}
public String getOnenum() {
return onenum;
}
public String getCzfu() {
return czfu;
}
public String getTwonum() {
return twonum;
}
//操作符
private String czfu = "";
//被除数
private String twonum = "";
public String getYanzhenmastr() {
return yanzhenmastr;
}
protected int alpha = 5;
public int getAlpha() {
return alpha;
}
public void setAlpha(int alpha) {
this.alpha = alpha;
}
/**
* 生成随机字符数组
*
* @return 字符数组
*/
protected String getVilidCode() {
int numlength = random.nextInt(2)+1;
for (int i = 0; i < numlength; i++) {
char rnum = Randoms.getNum();
yanzhenmastr = yanzhenmastr + rnum;
onenum = onenum + rnum;
}
czfu = Randoms.getChaoZuoFu()+"";
yanzhenmastr = yanzhenmastr + czfu;
for (int i = 0; i < numlength; i++) {
char rnum = Randoms.getNum();
yanzhenmastr = yanzhenmastr + rnum;
twonum = twonum + rnum;
}
yanzhenmastr = yanzhenmastr + "=?";
return yanzhenmastr;
}
public Font getFont() {
return font;
}
public void setFont(Font font) {
this.font = font;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
/**
* 给定范围获得随机颜色
*
* @return Color 随机颜色
*/
protected Color color(int fc, int bc) {
if (fc > 255)
fc = 255;
if (bc > 255)
bc = 255;
int r = fc + Randoms.num(bc - fc);
int g = fc + Randoms.num(bc - fc);
int b = fc + Randoms.num(bc - fc);
return new Color(r, g, b);
}
/**
* 验证码输出,抽象方法,由子类实现
*
* @param os
* 输出流
*/
public abstract void out(OutputStream os);
}
Java代码
import java.io.IOException;
import java.io.OutputStream;
/**
*
* @author wzztestin
* 图片编码器
*/
public class Encoder {
private static final int EOF = -1;
private int imgW, imgH;
private byte[] pixAry;
private int initCodeSize;
private int remaining;
private int curPixel;
/**
* GIF Image compression routines
*/
static final int BITS = 12;
static final int HSIZE = 5003;
int n_bits;
int maxbits = BITS;
int maxcode;
int maxmaxcode = 1 << BITS;
int[] htab = new int[HSIZE];
int[] codetab = new int[HSIZE];
int hsize = HSIZE;
int free_ent = 0;
boolean clear_flg = false;
int g_init_bits;
int ClearCode;
int EOFCode;
int cur_accum = 0;
int cur_bits = 0;
int masks[] = { 0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F,
0x007F, 0x00FF, 0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF,
0x7FFF, 0xFFFF };
int a_count;
byte[] accum = new byte[256];
Encoder(int width, int height, byte[] pixels, int color_depth) {
imgW = width;
imgH = height;
pixAry = pixels;
initCodeSize = Math.max(2, color_depth);
}
void char_out(byte c, OutputStream outs) throws IOException {
accum[a_count++] = c;
if (a_count >= 254)
flush_char(outs);
}
void cl_block(OutputStream outs) throws IOException {
cl_hash(hsize);
free_ent = ClearCode + 2;
clear_flg = true;
output(ClearCode, outs);
}
void cl_hash(int hsize) {
for (int i = 0; i < hsize; ++i)
htab[i] = -1;
}
void compress(int init_bits, OutputStream outs) throws IOException {
int fcode;
int i ;
int c;
int ent;
int disp;
int hsize_reg;
int hshift;
g_init_bits = init_bits;
clear_flg = false;
n_bits = g_init_bits;
maxcode = MAXCODE(n_bits);
ClearCode = 1 << (init_bits - 1);
EOFCode = ClearCode + 1;
free_ent = ClearCode + 2;
a_count = 0;
ent = nextPixel();
hshift = 0;
for (fcode = hsize; fcode < 65536; fcode *= 2)
++hshift;
hshift = 8 - hshift;
hsize_reg = hsize;
cl_hash(hsize_reg);
output(ClearCode, outs);
outer_loop: while ((c = nextPixel()) != EOF) {
fcode = (c << maxbits) + ent;
i = (c << hshift) ^ ent;
if (htab[i] == fcode) {
ent = codetab[i];
continue;
} else if (htab[i] >= 0)
{
disp = hsize_reg - i;
if (i == 0)
disp = 1;
do {
if ((i -= disp) < 0)
i += hsize_reg;
if (htab[i] == fcode) {
ent = codetab[i];
continue outer_loop;
}
} while (htab[i] >= 0);
}
output(ent, outs);
ent = c;
if (free_ent < maxmaxcode) {
codetab[i] = free_ent++;
htab[i] = fcode;
} else
cl_block(outs);
}
output(ent, outs);
output(EOFCode, outs);
}
void encode(OutputStream os) throws IOException {
os.write(initCodeSize);
remaining = imgW * imgH;
curPixel = 0;
compress(initCodeSize + 1, os);
os.write(0);
}
void flush_char(OutputStream outs) throws IOException {
if (a_count > 0) {
outs.write(a_count);
outs.write(accum, 0, a_count);
a_count = 0;
}
}
final int MAXCODE(int n_bits) {
return (1 << n_bits) - 1;
}
private int nextPixel() {
if (remaining == 0)
return EOF;
--remaining;
byte pix = pixAry[curPixel++];
return pix & 0xff;
}
void output(int code, OutputStream outs) throws IOException {
cur_accum &= masks[cur_bits];
if (cur_bits > 0)
cur_accum |= (code << cur_bits);
else
cur_accum = code;
cur_bits += n_bits;
while (cur_bits >= 8) {
char_out((byte) (cur_accum & 0xff), outs);
cur_accum >>= 8;
cur_bits -= 8;
}
if (free_ent > maxcode || clear_flg) {
if (clear_flg) {
maxcode = MAXCODE(n_bits = g_init_bits);
clear_flg = false;
} else {
++n_bits;
if (n_bits == maxbits)
maxcode = maxmaxcode;
else
maxcode = MAXCODE(n_bits);
}
}
if (code == EOFCode) {
while (cur_bits > 0) {
char_out((byte) (cur_accum & 0xff), outs);
cur_accum >>= 8;
cur_bits -= 8;
}
flush_char(outs);
}
}
}
import java.awt.Color;
import java.awt.Font;
import java.io.OutputStream;
import java.util.Random;
/**
* 验证码抽象类,暂时不支持中文
* @author wzztestin
*
*/
public abstract class Captcha {
private static final Random random = new Random();
// 字体
protected Font font = new Font("Verdana", Font.ITALIC | Font.BOLD, 28);
// 默认宽度
protected int width = 150;
//默认高度
protected int height = 40;
//验证码串
private String yanzhenmastr = "";
//除数
private String onenum = "";
/**
* 生成随机颜色
* @param fc
* @param bc
* @return Color
*/
Color getRandColor(int fc, int bc) {
Random random = new Random();
if (fc > 255) {
fc = 255;
}
if (bc > 255) {
bc = 255;
}
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
/**
* 生成随机字体
* @return Font
*/
Font getRandomFont() {
String[] fonts = {"Georgia", "Verdana", "Arial", "Tahoma", "Time News Roman", "Courier New", "Arial Black", "Quantzite"};
int fontIndex = (int)Math.round(Math.random() * (fonts.length - 1));
int fontSize = 28;
return new Font(fonts[fontIndex], Font.PLAIN, fontSize);
}
public String getOnenum() {
return onenum;
}
public String getCzfu() {
return czfu;
}
public String getTwonum() {
return twonum;
}
//操作符
private String czfu = "";
//被除数
private String twonum = "";
public String getYanzhenmastr() {
return yanzhenmastr;
}
protected int alpha = 5;
public int getAlpha() {
return alpha;
}
public void setAlpha(int alpha) {
this.alpha = alpha;
}
/**
* 生成随机字符数组
*
* @return 字符数组
*/
protected String getVilidCode() {
int numlength = random.nextInt(2)+1;
for (int i = 0; i < numlength; i++) {
char rnum = Randoms.getNum();
yanzhenmastr = yanzhenmastr + rnum;
onenum = onenum + rnum;
}
czfu = Randoms.getChaoZuoFu()+"";
yanzhenmastr = yanzhenmastr + czfu;
for (int i = 0; i < numlength; i++) {
char rnum = Randoms.getNum();
yanzhenmastr = yanzhenmastr + rnum;
twonum = twonum + rnum;
}
yanzhenmastr = yanzhenmastr + "=?";
return yanzhenmastr;
}
public Font getFont() {
return font;
}
public void setFont(Font font) {
this.font = font;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
/**
* 给定范围获得随机颜色
*
* @return Color 随机颜色
*/
protected Color color(int fc, int bc) {
if (fc > 255)
fc = 255;
if (bc > 255)
bc = 255;
int r = fc + Randoms.num(bc - fc);
int g = fc + Randoms.num(bc - fc);
int b = fc + Randoms.num(bc - fc);
return new Color(r, g, b);
}
/**
* 验证码输出,抽象方法,由子类实现
*
* @param os
* 输出流
*/
public abstract void out(OutputStream os);
}
Java代码
import java.io.IOException;
import java.io.OutputStream;
/**
*
* @author wzztestin
* 图片编码器
*/
public class Encoder {
private static final int EOF = -1;
private int imgW, imgH;
private byte[] pixAry;
private int initCodeSize;
private int remaining;
private int curPixel;
/**
* GIF Image compression routines
*/
static final int BITS = 12;
static final int HSIZE = 5003;
int n_bits;
int maxbits = BITS;
int maxcode;
int maxmaxcode = 1 << BITS;
int[] htab = new int[HSIZE];
int[] codetab = new int[HSIZE];
int hsize = HSIZE;
int free_ent = 0;
boolean clear_flg = false;
int g_init_bits;
int ClearCode;
int EOFCode;
int cur_accum = 0;
int cur_bits = 0;
int masks[] = { 0x0000, 0x0001, 0x0003, 0x0007, 0x000F, 0x001F, 0x003F,
0x007F, 0x00FF, 0x01FF, 0x03FF, 0x07FF, 0x0FFF, 0x1FFF, 0x3FFF,
0x7FFF, 0xFFFF };
int a_count;
byte[] accum = new byte[256];
Encoder(int width, int height, byte[] pixels, int color_depth) {
imgW = width;
imgH = height;
pixAry = pixels;
initCodeSize = Math.max(2, color_depth);
}
void char_out(byte c, OutputStream outs) throws IOException {
accum[a_count++] = c;
if (a_count >= 254)
flush_char(outs);
}
void cl_block(OutputStream outs) throws IOException {
cl_hash(hsize);
free_ent = ClearCode + 2;
clear_flg = true;
output(ClearCode, outs);
}
void cl_hash(int hsize) {
for (int i = 0; i < hsize; ++i)
htab[i] = -1;
}
void compress(int init_bits, OutputStream outs) throws IOException {
int fcode;
int i ;
int c;
int ent;
int disp;
int hsize_reg;
int hshift;
g_init_bits = init_bits;
clear_flg = false;
n_bits = g_init_bits;
maxcode = MAXCODE(n_bits);
ClearCode = 1 << (init_bits - 1);
EOFCode = ClearCode + 1;
free_ent = ClearCode + 2;
a_count = 0;
ent = nextPixel();
hshift = 0;
for (fcode = hsize; fcode < 65536; fcode *= 2)
++hshift;
hshift = 8 - hshift;
hsize_reg = hsize;
cl_hash(hsize_reg);
output(ClearCode, outs);
outer_loop: while ((c = nextPixel()) != EOF) {
fcode = (c << maxbits) + ent;
i = (c << hshift) ^ ent;
if (htab[i] == fcode) {
ent = codetab[i];
continue;
} else if (htab[i] >= 0)
{
disp = hsize_reg - i;
if (i == 0)
disp = 1;
do {
if ((i -= disp) < 0)
i += hsize_reg;
if (htab[i] == fcode) {
ent = codetab[i];
continue outer_loop;
}
} while (htab[i] >= 0);
}
output(ent, outs);
ent = c;
if (free_ent < maxmaxcode) {
codetab[i] = free_ent++;
htab[i] = fcode;
} else
cl_block(outs);
}
output(ent, outs);
output(EOFCode, outs);
}
void encode(OutputStream os) throws IOException {
os.write(initCodeSize);
remaining = imgW * imgH;
curPixel = 0;
compress(initCodeSize + 1, os);
os.write(0);
}
void flush_char(OutputStream outs) throws IOException {
if (a_count > 0) {
outs.write(a_count);
outs.write(accum, 0, a_count);
a_count = 0;
}
}
final int MAXCODE(int n_bits) {
return (1 << n_bits) - 1;
}
private int nextPixel() {
if (remaining == 0)
return EOF;
--remaining;
byte pix = pixAry[curPixel++];
return pix & 0xff;
}
void output(int code, OutputStream outs) throws IOException {
cur_accum &= masks[cur_bits];
if (cur_bits > 0)
cur_accum |= (code << cur_bits);
else
cur_accum = code;
cur_bits += n_bits;
while (cur_bits >= 8) {
char_out((byte) (cur_accum & 0xff), outs);
cur_accum >>= 8;
cur_bits -= 8;
}
if (free_ent > maxcode || clear_flg) {
if (clear_flg) {
maxcode = MAXCODE(n_bits = g_init_bits);
clear_flg = false;
} else {
++n_bits;
if (n_bits == maxbits)
maxcode = maxmaxcode;
else
maxcode = MAXCODE(n_bits);
}
}
if (code == EOFCode) {
while (cur_bits > 0) {
char_out((byte) (cur_accum & 0xff), outs);
cur_accum >>= 8;
cur_bits -= 8;
}
flush_char(outs);
}
}
}
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