import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
/**
* 前端传入字符生成图片
* @param code 传入字符
* @param request
* @param response
*/
@RequestMapping("/{code}/getImg")
public void getImg(@PathVariable String code,HttpServletRequest request, HttpServletResponse response) {
try {
String projectName = "/images/post_null.png";
//获取文件的路径
String url = request.getSession().getServletContext().getRealPath(projectName);
System.out.println(url);
/*****************方法1*****************/
//通用util图片处理类
ImageUtil imageUtil = new ImageUtil();
BufferedImage image = imageUtil.createImage(100, 20, "123456789");
//以二进制输出
ServletOutputStream sos = response.getOutputStream();
ImageIO.write(image, "PNG", sos);
sos.close();
/*****************方法2*****************/
File file = new File(url);
if (!file.exists()) {
file.createNewFile();
}
if (image != null)
ImageIO.write(image, "png", file);
/*****************方法3*****************/
// 以byte流的方式打开文件 d:1.gif
FileInputStream hFile = new FileInputStream(url);
//得到文件大小
int i=hFile.available();
byte data[]=new byte[i];
//读数据
hFile.read(data);
//得到向客户端输出二进制数据的对象
OutputStream toClient=response.getOutputStream();
//输出数据
toClient.write(data);
toClient.flush();
toClient.close();
hFile.close();
} catch (IOException e) {
LOG.error("创建图片发生异常!"+code);
e.printStackTrace();
}
}
/**
* 通用传入文字生成图片
* @param width 图片宽度
* @param height 图片高度
* @param s 生成图片的文字
* @return BufferedImage对象
*/
public static BufferedImage createImage(int width, int height, String s) {
Font font = new Font("Serif", Font.BOLD, 10);
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = (Graphics2D)bi.getGraphics();
g2.setBackground(Color.WHITE);
g2.clearRect(0, 0, width, height);
g2.setPaint(Color.BLACK);
FontRenderContext context = g2.getFontRenderContext();
Rectangle2D bounds = font.getStringBounds(s, context);
double x = (width - bounds.getWidth()) / 2;
double y = (height - bounds.getHeight()) / 2;
double ascent = -bounds.getY();
double baseY = y + ascent;
g2.drawString(s, (int)x, (int)baseY);
return bi;
}