本来这不是一个特别难的问题 但是刚开始的时候一直就想通过纯的代码实现 而不借助于水印 花了有一天的时间 这的确不应该 但是从中我们也可以认识到 对于代码 千万不能钻牛角尖 正所谓 跳跳大道公罗马 不多说 下面写代码 给需要的朋友一些帮助
/**
* 输出图片的公用方法
*
* @param message
* 弧度上的字 （基本都是从数据库读取）
* @param centerName
* 中间要显示的名字
* @param width
* 中间字体的宽度
* @param height
* 中间字体的高度
* @return
* @throws FileNotFoundException
* @throws IOException
*/
public static BufferedImage bufferedImageUtil(String message,
String centerName, int width, int height)
throws FileNotFoundException, IOException {
BufferedImage image = null;
if (message != null) {
final int CENTERX = 90;
final int CENTERY = 90;
final int radius = 76;
// 获取get_png文件夹
ActionContext ac = ActionContext.getContext();
ServletContext sc = (ServletContext) ac
.get(ServletActionContext.SERVLET_CONTEXT);
String filePath = sc.getRealPath(File.separator + "style"
+ File.separator + "imgs");
String path = filePath;
image = ImageIO.read(new FileInputStream(path + File.separator
+ "newIcon.jpg"));
Graphics2D g2 = image.createGraphics();// 得到图形上下文
g2.setColor(Color.RED); // 设置画笔颜色
// 设置字体
g2.setFont(new Font("宋体", Font.LAYOUT_LEFT_TO_RIGHT, 15));// 写入签名
if (centerName != null) {
g2.drawString(centerName, width, height);
}
// 根据输入字符串得到字符数组
String[] messages2 = message.split("", 0);
String[] messages = new String[messages2.length - 1];
System.arraycopy(messages2, 1, messages, 0, messages2.length - 1);
// 输入的字数
int ilength = messages.length;
// 设置字体属性
int fontsize = 16;
Font f = new Font("", Font.BOLD, fontsize);
FontRenderContext context = g2.getFontRenderContext();
Rectangle2D bounds = f.getStringBounds(message, context);
// 字符宽度＝字符串长度/字符数
double char_interval = (bounds.getWidth() / ilength);
// 上坡度
double ascent = -bounds.getY();
int first = 0, second = 0;
boolean odd = false;
if (ilength % 2 == 1) {
first = (ilength - 1) / 2;
odd = true;
} else {
first = (ilength) / 2 - 1;
second = (ilength) / 2;
odd = false;
}
double radius2 = radius - ascent;
double x0 = CENTERX;
double y0 = CENTERY - radius + ascent;
// 旋转角度
double a = 2 * Math.asin(char_interval / (2 * radius2));
if (odd) {
g2.setFont(f);
g2.drawString(messages[first],
(float) (x0 - char_interval / 2), (float) y0);
// 中心点的右边
for (int i = first + 1; i < ilength; i++) {
double aa = (i - first) * a;
double ax = radius2 * Math.sin(aa);
double ay = radius2 - radius2 * Math.cos(aa);
AffineTransform transform = AffineTransform
.getRotateInstance(aa);// ,x0 + ax, y0 + ay);
Font f2 = f.deriveFont(transform);
g2.setFont(f2);
g2
.drawString(messages[i],
(float) (x0 + ax - char_interval / 2
* Math.cos(aa)),
(float) (y0 + ay - char_interval / 2
* Math.sin(aa)));
}
// 中心点的左边
for (int i = first - 1; i > -1; i--) {
double aa = (first - i) * a;
double ax = radius2 * Math.sin(aa);
double ay = radius2 - radius2 * Math.cos(aa);
AffineTransform transform = AffineTransform
.getRotateInstance(-aa);// ,x0 + ax, y0 + ay);
Font f2 = f.deriveFont(transform);
g2.setFont(f2);
g2
.drawString(messages[i],
(float) (x0 - ax - char_interval / 2
* Math.cos(aa)),
(float) (y0 + ay + char_interval / 2
* Math.sin(aa)));
}
} else {
// 中心点的右边
for (int i = second; i < ilength; i++) {
double aa = (i - second + 0.5) * a;
double ax = radius2 * Math.sin(aa);
double ay = radius2 - radius2 * Math.cos(aa);
AffineTransform transform = AffineTransform
.getRotateInstance(aa);// ,x0 + ax, y0 + ay);
Font f2 = f.deriveFont(transform);
g2.setFont(f2);
g2
.drawString(messages[i],
(float) (x0 + ax - char_interval / 2
* Math.cos(aa)),
(float) (y0 + ay - char_interval / 2
* Math.sin(aa)));
}
// 中心点的左边
for (int i = first; i > -1; i--) {
double aa = (first - i + 0.5) * a;
double ax = radius2 * Math.sin(aa);
double ay = radius2 - radius2 * Math.cos(aa);
AffineTransform transform = AffineTransform
.getRotateInstance(-aa);// ,x0 + ax, y0 + ay);
Font f2 = f.deriveFont(transform);
g2.setFont(f2);
g2
.drawString(messages[i],
(float) (x0 - ax - char_interval / 2
* Math.cos(aa)),
(float) (y0 + ay + char_interval / 2
* Math.sin(aa)));
}
}
g2.dispose();
}
return image;
}
---------------------------------上述为圆形带五角星的章-------------------------
/**
* 方形名字章
*
* @param message
* 要刻的名字
* @return
* @throws FileNotFoundException
* @throws IOException
*/
public static BufferedImage getSquarePng(String message)
throws FileNotFoundException, IOException {
BufferedImage image = null;
if (message != null) {
ActionContext ac = ActionContext.getContext();
ServletContext sc = (ServletContext) ac
.get(ServletActionContext.SERVLET_CONTEXT);
String filePath = sc.getRealPath(File.separator + "style"
+ File.separator + "imgs");
String path = filePath;
image = ImageIO.read(new FileInputStream(path + File.separator
+ "squarePng.png"));
Graphics2D g2 = image.createGraphics();// 得到图形上下文
g2.setColor(Color.RED); // 设置画笔颜色
// 设置字体
g2.setFont(new Font("宋体", Font.LAYOUT_LEFT_TO_RIGHT, 80));// 写入签名
if (message != null) {
String newMessage = null;
// 如果三个 则 XXX章 如果两个则 XX之章 大于3个 则 取前三
if (message.length() == 2) {
newMessage = message + "之章";
} else if (message.length() == 3) {
newMessage = message + "章";
} else if (message.length() > 3) {
newMessage = message.substring(0, 3) + "章";
}
char[] charArray = newMessage.toCharArray();
g2.drawString(new String(new char[] { charArray[0] }), 90, 70); // 写文字
g2.drawString(new String(new char[] { charArray[1] }), 90, 160); // 写文字
g2.drawString(new String(new char[] { charArray[2] }), 10, 70); // 写文字
g2.drawString(new String(new char[] { charArray[3] }), 10, 160); // 写文字
}
}
return image;
}
---------------------------------方形章---------------------------------------
---------------------------------调用方法------------------------------------
/**
* 获取方形印章
*
* @return
*/
public String getSquarePngByUserName() {
String info = null;
BufferedImage image = null;
try {
ActionContext ac = ActionContext.getContext();
HttpServletResponse response = (HttpServletResponse) ac
.get(ServletActionContext.HTTP_RESPONSE);
response.setContentType("image/JPEG");
OutputStream output = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(output);
Users user = (Users) SiteAction.getEntity("loginUser");
if (user != null) {
String userName = user.getUName();
if (userName != null) {
image = OutPicture.getSquarePng(userName);
}
}
if (image != null) {
encoder.encode(image);
}
output.flush();
output.close();
} catch (Exception e) {
return ERROR;
}
return info;
}
// 工商行政管理局(圆形）
)
public String noticeOfRegistrationPng() {
String info = null;
try {
ActionContext ac = ActionContext.getContext();
HttpServletResponse response = (HttpServletResponse) ac
.get(ServletActionContext.HTTP_RESPONSE);
response.setContentType("image/JPEG");
OutputStream output = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(output);
BufferedImage image = OutPicture.bufferedImageUtil("工商行政管理局", null,
48, 150);
if (image != null) {
encoder.encode(image);
}
output.flush();
output.close();
} catch (Exception e) {
info = Action.ERROR;
}
return info;
}
--------------------------------效果--------------------------------