生成二维码，微信分享



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
先下载zxing开发包，这里用到的只是core那个jar包（我用的是core-3.1.0.jar）

github: https://github.com/zxing/zxing/wiki/Getting-Started-Developing,

当然你也可以从maven仓库下载jar包: http://central.maven.org/maven2/com/google/zxing/core/

实现类：

public class ZxingCode
{

	private static final int BLACK = 0xFF000000;
	private static final int WHITE = 0xFFFFFFFF;

	private ZxingCode()
	{
	}

	public static BufferedImage getQRCodeImage(String contents, int width, int height)
	{

		BufferedImage image = null;
		Map hints = new HashMap();
		hints.put(EncodeHintType.CHARACTER_SET, "utf-8");

		if(contents == null || width<=0 || height<=0){
			return null; 
		}
		
		try
		{
			BitMatrix matrix = new MultiFormatWriter().encode(contents,
					BarcodeFormat.QR_CODE, width, height, hints);
			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);
				}
			}
		}
		catch (WriterException e)
		{
			e.printStackTrace();
		}
		return image;
	}
	 
	public static void writeToFile(String contents, int width, int height,
			File file, String format) throws IOException
	{

		BufferedImage image = getQRCodeImage(contents, width, height);
		if (!ImageIO.write(image, format, file))
		{
			throw new IOException("Could not write an image of format "
					+ format + " to " + file);
		}
	}

	
	public static void writeToStream(String contents, int width, int height,
			String format, OutputStream stream) throws IOException
	{
		BufferedImage image = getQRCodeImage(contents, width, height);
		if (!ImageIO.write(image, format, stream))
		{
			throw new IOException("Could not write an image of format "
					+ format);
		}
	}

}

controller层获取操作：

@RequestMapping(value="/get_qrcode.jhtml", method=RequestMethod.GET)
	public void getQRCode(HttpServletRequest request ,HttpServletResponse response){
		
		String content = this.getParameter("content");
		
		/*
		//例子一
		BufferedImage  image = ZxingCode.getQRCodeImage(content, 230, 230);
		try
		{
			
			ServletOutputStream stream = response.getOutputStream();
			if(image != null){
				ImageIO.write(image, "png", stream);	
			}
			
			stream.flush();
			stream.close();
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}*/
		
		try
		{
			
			/*
			//例子二
			File outputFile = new File("E:/mynew.jpeg");
			ZxingCode.writeToFile(content, 300, 300, outputFile, "png");
			*/
			
			//例子三
			ZxingCode.writeToStream(content, 230, 230, "jpg", response.getOutputStream());
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}

	} 

maven依赖：

	  com.google.zxing
	  core
	  3.1.0

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