java生成二维码有很多开发的jar包如zxing是谷歌开发的，这里的话我使用zxing的开发包来实现的。我们在很多项目中需要动态生成二维码，来提供给用户，这样让更多人能够很好的通过二维码来体验自己的应用。
下面贴出代码，已经测试通过，大家可以直接复制代码使用：
java生成二维码
代码如下：
import java.awt.color;
import java.awt.graphics2d;
import java.awt.image;
import java.awt.geom.affinetransform;
import java.awt.image.affinetransformop;
import java.awt.image.bufferedimage;
import java.io.file;
import java.io.ioexception;
import java.io.unsupportedencodingexception;
import java.util.hashmap;
import java.util.map;
import javax.imageio.imageio;
import com.google.zxing.barcodeformat;
import com.google.zxing.encodehinttype;
import com.google.zxing.multiformatwriter;
import com.google.zxing.writerexception;
import com.google.zxing.common.bitmatrix;
import com.google.zxing.qrcode.decoder.errorcorrectionlevel;
public class matrixtoimagewriter {
private static final int image_width = 100;
private static final int image_height = 100;
private static final int image_half_width = image_width / 2;
private static final int frame_width = 2;
private static multiformatwriter mutiwriter = new multiformatwriter();
public static void encode(string content, int width, int height,
string srcimagepath, string destimagepath) {
try {
imageio.write(genbarcode(content, width, height, srcimagepath),
"jpg", new file(destimagepath));
} catch (ioexception e) {
e.printstacktrace();
} catch (writerexception e) {
e.printstacktrace();
}
}
private static bufferedimage genbarcode(string content, int width,
int height, string srcimagepath) throws writerexception,
ioexception {
bufferedimage scaleimage = scale(srcimagepath, image_width,
image_height, true);
int[][] srcpixels = new int[image_width][image_height];
for (int i = 0; i < scaleimage.getwidth(); i++) {
for (int j = 0; j < scaleimage.getheight(); j++) {
srcpixels[i][j] = scaleimage.getrgb(i, j);
}
}
map<encodehinttype, object> hint = new hashmap<encodehinttype, object>();
hint.put(encodehinttype.character_set, "utf-8");
hint.put(encodehinttype.error_correction, errorcorrectionlevel.h);
// 生成二维码
bitmatrix matrix = mutiwriter.encode(content, barcodeformat.qr_code,
width, height, hint);
// 二维矩阵转为一维像素数组
int halfw = matrix.getwidth() / 2;
int halfh = matrix.getheight() / 2;
int[] pixels = new int[width * height];
for (int y = 0; y < matrix.getheight(); y++) {
for (int x = 0; x < matrix.getwidth(); x++) {
// 左上角颜色,根据自己需要调整颜色范围和颜色
if (x > 0 && x < 170 && y > 0 && y < 170) {
color color = new color(231, 144, 56);
int colorint = color.getrgb();
pixels[y * width + x] = matrix.get(x, y) ? colorint
: 16777215;
}
// 读取图片
else if (x > halfw - image_half_width
&& x < halfw + image_half_width
&& y > halfh - image_half_width
&& y < halfh + image_half_width) {
pixels[y * width + x] = srcpixels[x - halfw
+ image_half_width][y - halfh + image_half_width];
} else if ((x > halfw - image_half_width - frame_width
&& x < halfw - image_half_width + frame_width
&& y > halfh - image_half_width - frame_width && y < halfh
+ image_half_width + frame_width)
|| (x > halfw + image_half_width - frame_width
&& x < halfw + image_half_width + frame_width
&& y > halfw - image_half_width - frame_width && y < halfh
+ image_half_width + frame_width)
|| (x > halfw - image_half_width - frame_width
&& x < halfw + image_half_width + frame_width
&& y > halfh - image_half_width - frame_width && y < halfh
- image_half_width + frame_width)
|| (x > halfw - image_half_width - frame_width
&& x < halfw + image_half_width + frame_width
&& y > halfh + image_half_width - frame_width && y < halfh
+ image_half_width + frame_width)) {
pixels[y * width + x] = 0xfffffff;
// 在图片四周形成边框
} else {
// 二维码颜色
int num1 = (int) (50 - (50.0 - 13.0) / matrix.getheight()
* (y + 1));
int num2 = (int) (165 - (165.0 - 72.0) / matrix.getheight()
* (y + 1));
int num3 = (int) (162 - (162.0 - 107.0)
/ matrix.getheight() * (y + 1));
color color = new color(num1, num2, num3);
int colorint = color.getrgb();
// 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色；
pixels[y * width + x] = matrix.get(x, y) ? colorint
: 16777215;
// 0x000000:0xffffff
}
}
}
bufferedimage image = new bufferedimage(width, height,
bufferedimage.type_int_rgb);
image.getraster().setdataelements(0, 0, width, height, pixels);
return image;
}
private static bufferedimage scale(string srcimagefile, int height,
int width, boolean hasfiller) throws ioexception {
double ratio = 0.0; // 缩放比例
file file = new file(srcimagefile);
bufferedimage srcimage = imageio.read(file);
image destimage = srcimage.getscaledinstance(width, height,
bufferedimage.scale_smooth);
// 计算比例
if ((srcimage.getheight() > height) || (srcimage.getwidth() > width)) {
if (srcimage.getheight() > srcimage.getwidth()) {
ratio = (new integer(height)).doublevalue()
/ srcimage.getheight();
} else {
ratio = (new integer(width)).doublevalue()
/ srcimage.getwidth();
}
affinetransformop op = new affinetransformop(
affinetransform.getscaleinstance(ratio, ratio), null);
destimage = op.filter(srcimage, null);
}
if (hasfiller) {
// 补白
bufferedimage image = new bufferedimage(width, height,
bufferedimage.type_int_rgb);
graphics2d graphic = image.creategraphics();
graphic.setcolor(color.white);
graphic.fillrect(0, 0, width, height);
if (width == destimage.getwidth(null))
graphic.drawimage(destimage, 0,
(height - destimage.getheight(null)) / 2,
destimage.getwidth(null), destimage.getheight(null),
color.white, null);
else
graphic.drawimage(destimage,
(width - destimage.getwidth(null)) / 2, 0,
destimage.getwidth(null), destimage.getheight(null),
color.white, null);
graphic.dispose();
destimage = image;
}
return (bufferedimage) destimage;
}
public static void main(string[] args) throws unsupportedencodingexception {
// 依次为内容(不支持中文),宽,长,中间图标路径,储存路径
matrixtoimagewriter.encode("http://www.baidu.com/", 512, 512,
"d:\\logo.png", "d:\\2013-01.jpg");
}
}
以上就是本文的全部内容，帮助大家设计属于自己的二维码。
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