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1. Éú³ÉpngͼƬ
int width = 400;
int height = 300;
// ´´½¨BufferedImage¶ÔÏó
BufferedImage image = new BufferedImage(width, height,     BufferedImage.TYPE_INT_RGB);
// »ñÈ¡Graphics2D
Graphics2D g2d = image.createGraphics();
// »­Í¼
g2d.setColor(new Color(255,0,0));
g2d.setStroke(new BasicStroke(1));
g2d.draw
//ÊͷŶÔÏó
g2d.dispose();
// ±£´æÎļþ    
ImageIO.write(image, "png", new File("c:/test.png"));
int width = 400;
int height = 300;
// ´´½¨BufferedImage¶ÔÏó
BufferedImage image = new BufferedImage(width, height,     BufferedImage.TYPE_INT_RGB);
// »ñÈ¡Graphics2D
Graphics2D g2d = image.createGraphics();
// »­Í¼
g2d.setColor(new Color(255,0,0));
g2d.setStroke(new BasicStroke(1));
g2d.draw
//ÊͷŶÔÏó
g2d.dispose();
// ±£´æÎļþ    
ImageIO.write(image, "png", new File("c:/test.png"));
  ÕâÖ»ÊÇ»æÖÆÍ¼ÐεĴúÂ룬Æä±³¾°ÊǺÚÉ«µÄ£¬ÈçºÎ²ÅÄܱ³¾°Í¸Ã÷ÄØ£¿¼ÌÐøËÑË÷£¬Ã»Óеõ½½á¹û£¬²»¹ýËѳöÒÔÏ´úÂ룬ËüÖ»ÊǰÑ×Ô¼º»æÖƵÄͼÐÎÉèÖÃΪ͸Ã÷»ò°ë͸Ã÷£¬±³¾°²¢²»Í¸Ã÷£¬ÈçÏ£º
2. »æÖưë͸Ã÷ͼÐÎ
int width = 400;
int height = 300;
// ´´½¨BufferedImage¶ÔÏó
BufferedImage image = new BufferedImage(width, height,     BufferedImage.TYPE_INT_RGB);
// »ñÈ¡Graphics2D
Graphics2D g2d = image.createGraphics();
// ÉèÖÃ͸Ã÷¶È
g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 1.0f));  // 1.0fΪ͸Ã÷¶È £¬Öµ´Ó0-1.0£¬ÒÀ´Î±äµÃ²»Í¸Ã÷
// »­Í¼


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HttpClient httpClient = new HttpClient();
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