如何在读取文件和创建.bmp图像时继续下一行

Question

我正在通过java代码将.txt文件转换为.bmp文件。我的.txt文件包含多行。我正在阅读每一行并将其打印在图像上。

**我的文本文件**

45

werwerwr

abc abc abc

xxxx

**正在创建的图像(.bmp)**

所有内容都打印在一行中，如下所示：

45werwerwrabc abc abcxxxx

我的代码：

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import javax.imageio.ImageIO;
public class TextToGraphics {
public static void main(String[] args) {
try {
String storeData = "";
String data = "";
File f = new File("/home/vipul/Desktop/123.txt");
BufferedReader br = new BufferedReader(new FileReader(f));
while ((data = br.readLine()) != null) {
storeData =storeData + data +System.lineSeparator();
}

BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_3BYTE_BGR);
Graphics2D g2d = img.createGraphics();
Font font = new Font("Arial", Font.PLAIN, 24);
g2d.setFont(font);
FontMetrics fm = g2d.getFontMetrics();
int width = fm.stringWidth(storeData);
int height = fm.getHeight();
g2d.dispose();
img = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
g2d = img.createGraphics();
g2d.setPaint ( new Color ( 255, 255, 255 ) );
g2d.fillRect ( 0, 0, img.getWidth(), img.getHeight() );
System.out.println(img.getWidth()+" "+img.getHeight());
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);

g2d.drawString(storeData, 0, fm.getAscent());
g2d.dispose();
ImageIO.write(img, "bmp", new File("/home/vipul/Desktop/123.bmp"));
} catch (Exception ex) {
ex.printStackTrace();
}
}
}

我想使图像与文本文件相同。若文本文件转到新行，那个么图像在新行上也应该有相同的单词。

请帮忙。提前感谢！！！

Answer 1

您正在将文件保存在字符串中。即使你在每行后面加上一个lineSeparator，img也不知道换行符是什么。你必须自己拆分数据，并为每行调用drawString。示例：

public class TextToGraphics {
public static void main(String[] args) {
try {
String storeData = "";
String data = "";
File f = new File("/home/vipul/Desktop/123.txt");
BufferedReader br = new BufferedReader(new FileReader(f));
while ((data = br.readLine()) != null) {
storeData =storeData + data +System.lineSeparator();
}
String [] sArr = storeData.split("n");
int longest =0;
int lines = 0;
for (String s : sArr){       //find the longest string
if(s.length()>longest){
longest = s.length();
}
lines++;              //count lines
}
BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_3BYTE_BGR);
Graphics2D g2d = img.createGraphics();
Font font = new Font("Arial", Font.PLAIN, 24);
g2d.setFont(font);
FontMetrics fm = g2d.getFontMetrics();
int width = fm.stringWidth(storeData);
int height = fm.getHeight();
g2d.dispose();
img = new BufferedImage(longest*font.getSize(), lines*font.getSize(), BufferedImage.TYPE_3BYTE_BGR); // set width and height in accordance with longest string and number of lines
g2d = img.createGraphics();
g2d.setPaint ( new Color ( 255, 255, 255 ) );
g2d.fillRect ( 0, 0, img.getWidth(), img.getHeight() );
System.out.println(img.getWidth()+" "+img.getHeight());
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);
int i = 0;
for(String s : storeData.split("n")){            
g2d.drawString(s, 0, fm.getAscent()+i); // call drawString for each line
i+=10;
}
g2d.dispose();
ImageIO.write(img, "bmp", new File("/home/vipul/Desktop/123.bmp"));
} catch (Exception ex) {
ex.printStackTrace();
}
}

}

Answer 2

我已经找到了解决问题的方法：

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import javax.imageio.ImageIO;
public class TextToGraphics {
public static void main(String[] args) {
try {
int imgWid = 300;
int imgHei = 300;
String text = "Hellonlklkj";
String storeData = "";
String data = "";
File f = new File("/home/vipul/Desktop/123.txt");
BufferedReader br = new BufferedReader(new FileReader(f));
int nextLinePosition=100;
int fontSize = 24;

//  BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_BYTE_GRAY);//png
BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_3BYTE_BGR);
Graphics2D g2d = img.createGraphics();
Font font = new Font("Arial", Font.PLAIN, fontSize);
g2d.setFont(font);
FontMetrics fm = g2d.getFontMetrics();
// int width = fm.stringWidth(text);
// int width = fm.stringWidth(storeData);
int width =imgWid;
// int height = fm.getHeight();
int height =imgHei;
g2d.dispose();
img = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
//         img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
g2d = img.createGraphics();
g2d.setPaint(new Color(255, 255, 255));
g2d.fillRect(0, 0, img.getWidth(), img.getHeight());
System.out.println(img.getWidth() + " " + img.getHeight());
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);
//    g2d.setBackground(Color.ORANGE);
//  g2d.drawString(text, 0, fm.getAscent());
//            for(String line : text.split("n")){
//            g2d.drawString(storeData, 0, fm.getAscent());
//        }
//  private void drawString( Graphics2D g2d, String text, int x, int y) {
//            for (String line : storeData.split("n")) //  g2d.drawString(line, width, height += g2d.getFontMetrics().getHeight());
//            {
while ((data = br.readLine()) != null) {
g2d.drawString(data, 0, nextLinePosition);
//  storeData = storeData + data + nextLinePosition;
nextLinePosition=nextLinePosition+fontSize;
//storeData = storeData + data + 'n';
} 

//                 g2d.drawString(line, 0, 12);
//            }
//}
//  g2d.drawString(storeData, 0, fm.getAscent());
g2d.dispose();
//  try {
ImageIO.write(img, "bmp", new File("/home/vipul/Desktop/123.bmp"));
//   } 
} catch (Exception ex) {
ex.printStackTrace();
}
}
}