【将txt文本转图片】

public static void main(String[] args)
{
try
{
File textFile = new File("F:\\java56班\\eclipse-SDK-4.2-win32\\1.txt");
File imageFile  = new File("F:\\java56班\\eclipse-SDK-4.2-win32\\1.png");
TextToImage texttoimage = new TextToImage(textFile, imageFile);
texttoimage.convert();
}
catch (Exception e)
{
e.printStackTrace();
}
}

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.image.codec.jpeg.JPEGCodec;

public class TextToImage {

/** 文本文件  */
private File textFile;
/** 图片文件 */
private File imageFile;
/** 图片 */
private BufferedImage image;
/** 图片宽度  */
private final int IMAGE_WIDTH = 200;
/** 图片高度 */
private final int IMAGE_HEIGHT = 60;
/** 图片类型  */
private final int IMAGE_TYPE = BufferedImage.TYPE_INT_RGB;

/**
* 构造函数
* @param textFile 文本文件
* @param imageFile 图片文件
*/
public TextToImage(File textFile,File imageFile){
this.textFile = textFile;
this.imageFile = imageFile;
this.image = new BufferedImage(IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_TYPE);
}

/**
* 将文本文件里文字，写入到图片中保存
* @return boolean  true，写入成功；false，写入失败
*/
public boolean convert() {

//读取文本文件
BufferedReader reader = null;
try {
reader = new BufferedReader(new FileReader(textFile));
} catch (FileNotFoundException e) {
e.printStackTrace();
return false;
}

//获取图像上下文
Graphics g = createGraphics(image);
String line;
//图片中文本行高
final int Y_LINEHEIGHT = 15;
int lineNum = 1;
try {
while((line = reader.readLine()) != null){
g.drawString(line, 0, lineNum * Y_LINEHEIGHT);
lineNum++;
}
g.dispose();

//保存为jpg图片
FileOutputStream fos = new FileOutputStream(imageFile);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);
encoder.encode(image);
fos.close();
} catch (IOException e) {
e.printStackTrace();
return false;
}
return true;
}

/**
* 获取到图像上下文
* @param image 图片
* @return Graphics
*/
private Graphics createGraphics(BufferedImage image){
Graphics g = image.createGraphics();
g.setColor(null); //设置背景色
g.fillRect(0, 0, IMAGE_WIDTH, IMAGE_HEIGHT);//绘制背景
g.setColor(Color.BLACK); //设置前景色
g.setFont(new Font("微软雅黑", Font.PLAIN, 15)); //设置字体
return g;
}