问题
I want to ask one question regarding my code which is how do I convert a multiple-line text into a single image using BufferReader. I am able to get the image of the text but all the lines of the text are coming as one single string in one line. Enclosing my code. Please review my code and suggest me as soon as possible:
package mypack;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import javax.imageio.ImageIO;
public class ImageDemo {
public static void main(String[] args) throws IOException {
// reading the String object from a file to be converted to image
/*File file = new File("D:/Vivek.txt");
StringBuilder sb=new StringBuilder();
BufferedReader reader = new BufferedReader(new FileReader(file));
while(true)
{
String text=reader.readLine();
System.out.println(text);
if(text==null)
break;
sb.append(text).append(' ');
sb.append("\n");
}
String text1=sb.toString();
reader.close();*/
String text=new String(Files.readAllBytes(Paths.get("D:/Vivek.txt")), StandardCharsets.UTF_8);
System.out.println(text);
// Image file name
String fileName = "Image";
// create a File Object
File newFile = new File("D:/Vivek.jpg");
// create the font you wish to use
Font font = new Font("Tahoma", Font.PLAIN, 20);
// create the FontRenderContext object which helps us to measure the
// text
FontRenderContext frc = new FontRenderContext(null, true, true);
// get the height and width of the text
Rectangle2D bounds = font.getStringBounds(text, frc);
int w = (int) bounds.getWidth();
int h = (int) bounds.getHeight();
// create a BufferedImage object
BufferedImage image = new BufferedImage(w, h,
BufferedImage.TYPE_INT_RGB);
// calling createGraphics() to get the Graphics2D
Graphics2D g = image.createGraphics();
// set color and other parameters
g.setColor(Color.white);
g.fillRect(0, 0, w, h);
g.setColor(Color.BLACK);
g.setFont(font);
g.drawString(text, (float) bounds.getX(), (float) -bounds.getY());
// releasing resources
g.dispose();
RenderedImage rImage = (RenderedImage) image;
// creating the file
ImageIO.write(rImage, "jpeg", newFile);
//merging the two buffered images to get a new image with text along with logo.
//load the source images
BufferedImage img1=ImageIO.read(new File("D:/Vivek.jpg"));
BufferedImage img2=ImageIO.read(new File("D:/logo.jpg"));
BufferedImage joined=joinBufferedImage(img1, img2);
ImageIO.write(joined, "png", new File("D:/Joined.png"));
System.out.println("Success");
}
public static BufferedImage joinBufferedImage(BufferedImage img1,BufferedImage img2) {
//do some calculate first
int offset = 500;
int wid = img1.getWidth()+img2.getWidth()+offset;
int height = Math.max(img1.getHeight(),img2.getHeight())+offset;
//create a new buffer and draw two image into the new image
BufferedImage newImage = new BufferedImage(wid,height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = newImage.createGraphics();
Color oldColor = g2.getColor();
//fill background
g2.setPaint(Color.WHITE);
g2.fillRect(0, 0, wid, height);
//draw image
g2.setColor(oldColor);
g2.drawImage(img2, null, 0, 0);
g2.drawImage(img1, null, 170, 150);
g2.dispose();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.setRenderingHint(RenderingHints.KEY_RENDERING,RenderingHints.VALUE_RENDER_QUALITY);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
return newImage;
}
}
回答1:
Hi here I am writing multiple lines on JPanel. And you can write code which create Image from JPanel.
package Stakeoverflow.swingFrame;
import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
public class MultiLineTextToImage{
public static void main(String[] args) {
String text = "Hello";
/*
Because font metrics is based on a graphics context, we need to create
a small, temporary image so we can ascertain the width and height
of the final image
*/
int width = 1000;
int height = 1000;
BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = img.createGraphics();
Font font = new Font("Arial", Font.PLAIN, 48);
g2d.setFont(font);
FontMetrics fm = g2d.getFontMetrics();
g2d.dispose();
img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
g2d = img.createGraphics();
g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
g2d.setFont(font);
//fm = g2d.getFontMetrics();
g2d.setColor(Color.BLACK);
File file = new File("C:\\Read.text");
BufferedReader br=null;
int nextLinePosition=100;
int fontSize = 48;
try {
br = new BufferedReader(new FileReader(file));
String line;
while ((line = br.readLine()) != null) {
g2d.drawString(line, 0, nextLinePosition);
nextLinePosition = nextLinePosition + fontSize;
}
br.close();
} catch (FileNotFoundException ex) {
Logger.getLogger(Testing.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(Testing.class.getName()).log(Level.SEVERE, null, ex);
}
g2d.dispose();
try {
ImageIO.write(img, "png", new File("Text.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
来源：https://stackoverflow.com/questions/27658986/how-to-convert-multi-line-text-to-image-using-java