2019年06月19日(星期三)  农历:己亥年五月十七

作者:三年。分类: JAVA

二维码现在已经到处都是了,下面是二维码的介绍

二维码 ,又称二维条码,二维条形码最早发明于日本,它是用某种特定的几何图形按一定规律在平面(二维方向上)分布的黑白相间的图形记录数据符号信息的,在代码编 制上巧妙地利用构成计算机内部逻辑基础的"0"、"1"比特流的概念,使用若干个与二进制相对应的几何形体来表示文字数值信息,通过图象输入设备或光电扫 描设备自动识读以实现信息自动处理。它具有条码技术的一些共性:每种码制有其特定的字符集;每个字符占有一定的宽度;具有一定的校验功能等。同时还具有对 不同行的信息自动识别功能、及处理图形旋转变化等特点。

1.java这边的话生成二维码有很多开发的jar包如zxing,qrcode.q前者是谷歌开发的后者则是小日本开发的,这里的话我使用zxing的开发包来弄

2.先下载zxing开发包,这里用到的只是core那个jar包

3.使用zxing开发还需要一个类,代码如下

[java]

package org.code;

import com.google.zxing.common.BitMatrix;

import javax.imageio.ImageIO;

import java.io.File;

import java.io.OutputStream;

import java.io.IOException;

import java.awt.image.BufferedImage;

public final class MatrixToImageWriter {

private static final int BLACK = 0xFF000000;

private static final int WHITE = 0xFFFFFFFF;

private MatrixToImageWriter() {}

public static BufferedImage toBufferedImage(BitMatrix matrix) {

int width = matrix.getWidth();

int height = matrix.getHeight();

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

for (int x = 0; x < width; x++) {

for (int y = 0; y < height; y++) {

image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);

}

}

return image;

}

public static void writeToFile(BitMatrix matrix, String format, File file)

throws IOException {

BufferedImage image = toBufferedImage(matrix);

if (!ImageIO.write(image, format, file)) {

throw new IOException("Could not write an image of format " + format + " to " + file);

}

}

public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)

throws IOException {

BufferedImage image = toBufferedImage(matrix);

if (!ImageIO.write(image, format, stream)) {

throw new IOException("Could not write an image of format " + format);

}

}

}

package org.lxh;

import com.google.zxing.common.BitMatrix;

import javax.imageio.ImageIO;

import java.io.File;

import java.io.OutputStream;

import java.io.IOException;

import java.awt.image.BufferedImage;

public final class MatrixToImageWriter {

private static final int BLACK = 0xFF000000;

private static final int WHITE = 0xFFFFFFFF;

private MatrixToImageWriter() {}

public static BufferedImage toBufferedImage(BitMatrix matrix) {

int width = matrix.getWidth();

int height = matrix.getHeight();

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

for (int x = 0; x < width; x++) {

for (int y = 0; y < height; y++) {

image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);

}

}

return image;

}

public static void writeToFile(BitMatrix matrix, String format, File file)

throws IOException {

BufferedImage image = toBufferedImage(matrix);

if (!ImageIO.write(image, format, file)) {

throw new IOException("Could not write an image of format " + format + " to " + file);

}

}

public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)

throws IOException {

BufferedImage image = toBufferedImage(matrix);

if (!ImageIO.write(image, format, stream)) {

throw new IOException("Could not write an image of format " + format);

}

}

}

4.借助上面的类生成二维码

[java]

package org.lxh;

import java.io.File;

import java.util.Hashtable;

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;

public class Test {

/**

* @param args

* @throws Exception

*/

public static void main(String[] args) throws Exception {

String text = "http://www.baidu.com";

int width = 300;

int height = 300;

//二维码的图片格式

String format = "gif";

Hashtable hints = new Hashtable();

//内容所使用编码

hints.put(EncodeHintType.CHARACTER_SET, "utf-8");

BitMatrix bitMatrix = new MultiFormatWriter()。encode(text,

BarcodeFormat.QR_CODE, width, height, hints);

//生成二维码

File outputFile = new File("d:"+File.separator+"new.gif");

MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);

}

}

package org.lxh;

import java.io.File;

import java.util.Hashtable;

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;

public class Test {

/**

* @param args

* @throws Exception

*/

public static void main(String[] args) throws Exception {

String text = "http://www.echohoo.com/emlog/m";

int width = 300;

int height = 300;

//二维码的图片格式

String format = "gif";

Hashtable hints = new Hashtable();

//内容所使用编码

hints.put(EncodeHintType.CHARACTER_SET, "utf-8");

BitMatrix bitMatrix = new MultiFormatWriter()。encode(text,

BarcodeFormat.QR_CODE, width, height, hints);

//生成二维码

File outputFile = new File("d:"+File.separator+"new.gif");

MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);

}

}

text就是二维码的内容里这里可以使普通的文字也可以是链接,很简单吧最后把生成的二维码图片给大家

温馨提示如有转载或引用以上内容之必要,敬请将本文链接作为出处标注,谢谢合作!

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