Java中给图片添加文字水印，字体大小问题
问题描述：
在给图片添加文字水印的时候怎样根据图片得知在setFont(new Font(typeface,style,fontSize));fontSize该设置多少来根据图片自适应。fontSize应该怎样计算出最佳值。
答
网上找一个计算的公式吧。
如果图片size种类少，可以自己做一个列表，哪个size对应哪个字体
答
package ouc.sei.test.servlet;
import java.io.*;
import java.awt.*;
import java.awt.image.*;
import java.util.*;
import org.apache.log4j.Logger;
import javax.imageio.ImageIO;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public final class ImageUtils {
public static Logger logger = Logger.getLogger(ImageUtils.class);
public static void main(String[] args) {
File sourceimage=new File("c:/image/") ;
File flist[]=sourceimage.listFiles();
for(int i=0;i<flist.length;i++){
System.out.println("flist[i] is "+flist[i].getName());
adjustpic("c:/image/"+flist[i].getName(),"c:/adjimage/ddddd"+i+".jpg",500,333);
pressImage("C:/33.PNG","c:/adjimage/ddddd"+i+".jpg",20,20);
//pressText("ybc","c:/adjimage/ddddd"+i+".jpg","宋体",800,234,12,20,20);
}
}
public final static void adjustpic(String originalpic,String adjustedpic,int imgwidth,int imgheight){
String filecreate=adjustedpic.substring(0,adjustedpic.lastIndexOf("/")+1);//获取最后一个“/”的位置，并把取得它之前的文件路径
try{
File adjfile=new File(filecreate);
if(!adjfile.exists()){
adjfile.mkdir();
}
}catch(Exception e){
System.out.println("新建文件夹操作出错");
e.printStackTrace();
}
try {
File _file = new File(originalpic);
Image src = ImageIO.read(_file);
int wideth = src.getWidth( null );
int height = src.getHeight( null );
boolean flag=true;
if (wideth >= height)
{
flag = true;
logger.info("图片长度Width大于或者等于高度Height");
System.out.println("图片长度Width大于或者等于高度Height");
}
else
{
flag = false;
logger.info("图片长度Width小于高度Height");
System.out.println("图片长度Width小于高度Height");
}
Float f = new Float(0);
if(flag){
f = ((new Float(height) * imgwidth) / new Float(wideth));
logger.info("新生成的图片的高度height是:" + f);
System.out.println("新的页面的高度是："+f);
int newHeight = f.intValue() + 1;
BufferedImage image = new BufferedImage(imgwidth, newHeight,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.createGraphics();
g.drawImage(src, 0 , 0 , imgwidth, newHeight, null );
g.dispose();
FileOutputStream out = new FileOutputStream(adjustedpic);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
out.close();
}
else{
f = ((new Float(wideth) * imgheight) / new Float(height));
logger.info("新生成的图片的宽度width是:" + f);
System.out.println("新的图片的宽度："+f);
int newWidth = f.intValue() + 1;
BufferedImage image = new BufferedImage(newWidth, imgheight,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.createGraphics();
g.drawImage(src, 0 , 0 , newWidth, imgheight, null );
g.dispose();
FileOutputStream out = new FileOutputStream(adjustedpic);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
out.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
public final static void pressImage(String pressImg, String targetImg, int x, int y) {
try {
File _file = new File(targetImg);
Image src = ImageIO.read(_file);
int wideth = src.getWidth( null );
int height = src.getHeight( null );
BufferedImage image = new BufferedImage(wideth, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.createGraphics();
g.drawImage(src, 0 , 0 , wideth, height, null );
// 水印文件
File _filebiao = new File(pressImg);
Image src_biao = ImageIO.read(_filebiao);
int wideth_biao = src_biao.getWidth( null );
int height_biao = src_biao.getHeight( null );
g.drawImage(src_biao, wideth - wideth_biao - x, height - height_biao - y, wideth_biao,
height_biao, null );
g.dispose();
FileOutputStream out = new FileOutputStream(targetImg);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void pressText(String pressText, String targetImg, String fontName, int fontStyle, int color, int fontSize, int x, int y) {
try {
File _file = new File(targetImg);
Image src = ImageIO.read(_file);
int wideth = src.getWidth( null );
int height = src.getHeight( null );
BufferedImage image = new BufferedImage(wideth, height,
BufferedImage.TYPE_INT_RGB);
Graphics g = image.createGraphics();
g.drawImage(src, 0 , 0 , wideth, height, null );
g.setColor(Color.RED);
g.setFont( new Font(fontName, fontStyle, fontSize));
g.drawString(pressText, wideth - fontSize - x, height - fontSize / 2 - y);
g.dispose();
FileOutputStream out = new FileOutputStream(targetImg);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image);
out.close();
} catch (Exception e) {
System.out.println(e);
}
}
}
答
thumbnailator
答
Thumbnailator是一个用来生成图像缩略图的 Java类库，通过很简单的代码即可生成图片缩略图，也可直接对一整个目录的图片生成缩略图。