import java.awt.Canvas;
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import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
public class TestImage extends Frame
{
private static final long serialVersionUID = 1L;
private static boolean PRESSED = false;
private static int pointX = 0;
private static int pointy = 200;
private static int RIGHT_GO = 0;
private static int LEFT_GO = 0;
private static int DIR = 0;
private static int ANGLE = 0;
private static int W = 50;
private static int H = 60;
private _Canvas canvas = null;
public TestImage ()
{
add (canvas = new _Canvas ());
setIgnoreRepaint (true);
requestFocus ();
}
public class _Canvas extends Canvas implements Runnable
{
private static final long serialVersionUID = 1L;
private BufferedImage bi = null;
private Image bufferedImage = null;
private Thread thread = null;
private long sleepTime = 10;
public _Canvas ()
{
try
{
bi = ImageIO.read (new File ("go.png"));
}
catch (IOException e)
{}
setBackground (Color.BLACK);
requestFocus ();
addKeyListener (new KeyListener ()
{
@Override
public void keyTyped ( KeyEvent e )
{}
@Override
public void keyReleased ( KeyEvent e )
{
RIGHT_GO = 0;
PRESSED = false;
}
@Override
public void keyPressed ( KeyEvent e )
{
// 38 40 37 39上下左右
DIR = e.getKeyCode ();
PRESSED = true;
}
});
}
@Override
public void paint ( Graphics g )
{
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint (RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.drawImage (rotateImage (bi.getSubimage (RIGHT_GO, LEFT_GO, W, H), ANGLE, true), pointX, pointy, W, H,
this);
g2d.dispose ();
}
@Override
public void update ( Graphics g )
{
if (null == bufferedImage)
{
bufferedImage = createImage (getWidth (), getHeight ());
}
Graphics bufferedG = bufferedImage.getGraphics ();
bufferedG.clearRect (0, 0, getWidth (), getHeight ());
paint (bufferedG);
bufferedG.dispose ();
g.drawImage (bufferedImage, 0, 0, this);
g.dispose ();
}
public void start ()
{
thread = new Thread (this);
thread.setName ("TestImage");
thread.setPriority (Thread.MIN_PRIORITY);
thread.start ();
}
public synchronized void stop ()
{
thread = null;
notify ();
}
@Override
public void run ()
{
Thread me = Thread.currentThread ();
while (thread == me !isShowing () || getSize ().width == 0)
{
try
{
Thread.sleep (555);
}
catch (InterruptedException e)
{
return;
}
}
while (thread == me isShowing ())
{
if (PRESSED)
{
try
{
if (DIR == 39)
{
RIGHT_GO = RIGHT_GO + 50;
LEFT_GO = 0;
pointX = pointX + 1;
if (pointX 420)
{
ANGLE = 90;
pointX--;
pointy--;
W = 60;
H = 50;
}
if (RIGHT_GO 50)
{
RIGHT_GO = 0;
}
}
else if (DIR == 37)
{
pointX = pointX - 1;
RIGHT_GO = RIGHT_GO + 50;
LEFT_GO = 60;
if (pointX 0)
{
ANGLE = -90;
pointX++;
pointy--;
W = 60;
H = 50;
}
if (RIGHT_GO 50)
{
RIGHT_GO = 0;
}
}
else if (DIR == 38)
{
W = 50;
H = 60;
pointy = 150;
ANGLE = 0;
RIGHT_GO = 100;
}
else if (DIR == 40)
{
W = 50;
H = 60;
ANGLE = 0;
pointy = 200;
RIGHT_GO = 0;
}
Thread.sleep (sleepTime);
repaint ();
}
catch (InterruptedException e)
{
break;
}
}
else
{
RIGHT_GO = RIGHT_GO + 50;
LEFT_GO = 0;
pointX = pointX + 1;
if (RIGHT_GO 50)
{
RIGHT_GO = 0;
}
if (pointX 500)
{
pointX = 0;
}
try
{
Thread.sleep (sleepTime);
repaint ();
}
catch (InterruptedException e)
{
break;
}
}
}
thread = null;
}
}
/**
* 旋转图像为指定角度
*
* @param degree
* @return
*/
public static BufferedImage rotateImage ( final BufferedImage image, final int angdeg, final boolean d )
{
int w = image.getWidth ();
int h = image.getHeight ();
int type = image.getColorModel ().getTransparency ();
BufferedImage img;
Graphics2D graphics2d;
( graphics2d = ( img = new BufferedImage (w, h, type) ).createGraphics () ).setRenderingHint (
RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
graphics2d.rotate (d ? -Math.toRadians (angdeg) : Math.toRadians (angdeg), w / 2, h / 2);
graphics2d.drawImage (image, 0, 0, null);
graphics2d.dispose ();
return img;
}
public static void main ( String[] args )
{
EventQueue.invokeLater (new Runnable ()
{
@Override
public void run ()
{
final TestImage ti = new TestImage ();
ti.setSize (new Dimension (500, 300));
ti.setLocationRelativeTo (null);
ti.addWindowListener (new WindowAdapter ()
{
@Override
public void windowClosing ( WindowEvent e )
{
System.exit (0);
}
@Override
public void windowDeiconified ( WindowEvent e )
{
ti.canvas.start ();
}
@Override
public void windowIconified ( WindowEvent e )
{
ti.canvas.stop ();
}
});
ti.setResizable (false);
ti.canvas.start ();
ti.setVisible (true);
}
});
}
}
在javascript中eval()可以实现字符串转代码，java中需要使用动态编译。
把获得的字符串写入一个临时文件中，然后编译它，在调用其中的函数。
我们把要转换的字符串构造一个完整的类:如果方法是有返回值的.则:
public object eval(string str){
//生成java文件
string s = "class temp{";
s += "object rt(){"
s += "myclass mc = new myclass();"
s += " return mc."+str+"();";
s += "}"
s +="}";
file f = new file("temp.java");
printwriter pw = new printwriter(new filewriter(f));
pw.println(s);
pw.close();
//动态编译
com.sun.tools.javac.main javac = new com.sun.tools.javac.main();
string[] cpargs = new string[] {"-d", "所在目录","temp.java"};
int status = javac.compile(cpargs);
if(status!=0){
system.out.println("没有成功编译源文件!");
return null;
}
//调用temp的rt方法返回结果:
myclassloader mc = new myclassloader();
class clasz = mc.loadclass("test.class",true);
method rt = clasz.getmethod("rt", new class[]{ string[].class });
return rt.invoke(null, new object[] { new string[0] });
//如果方法没有返回就直接调用
}
我们可以先写好多个重载的eval,有返回值和没有返回值的.以及可以传递参数的.
这样我们就可以用字符串转换为java的语句来执行.
#首先在D盘写一个文件"temp.html"，如下内容
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
head
title图片转文本/title
meta http-equiv="content-type" content="text/html; charset=gbk"
style type="text/css"
body {
font-family: 宋体; line-height: 0.8em; letter-spacing: 0px; font-size: 8px;
}
/style
/head
body
${content}
/body
/html
#在D盘放一个图片（放小一点的）"a.jpg"
#运行如下JAVA代码：
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import javax.imageio.ImageIO;
public class Test {
/** 此处设置灰度字符，此处只用十个字符，可以设置更多 */
private static char[] cs = new char[] { '.', ',', '*', '+', '=', '', '$', '@', '#', ' ' };
public static void main(String[] args) throws IOException {
// 读取图片
BufferedImage bfedimage = ImageIO.read(new File("D:\\a.jpg"));
// 图片转字符串后的数组
char[][] css = new char[bfedimage.getWidth()][bfedimage.getHeight()];
for (int x = 0; x bfedimage.getWidth(); x++) {
for (int y = 0; y bfedimage.getHeight(); y++) {
int rgb = bfedimage.getRGB(x, y);
Color c = new Color(rgb);
// 得到灰度值
int cc = (c.getRed() + c.getGreen() + c.getBlue()) / 3;
css[x][y] = cs[(int) ((cc * 10 - 1) / 255)];
}
}
// 取得模板HTML
String temp = readFile(new File("D:\\temp.html"),"gbk");
StringBuffer sb = new StringBuffer();
// 开始拼接内容
for (int y = 0; y css[0].length; y++) {
for (int x = 0; x css.length; x++) {
sb.append(css[x][y]);
}
sb.append("\r\n");
}
System.out.println(sb.toString());
// 生成文件
String content = toHTML(sb.toString());
String filecontent = replaceStrAllNotBack(temp, "${content}", content);
writeFile(new File("D:\\content.html"), filecontent, "gbk");
}
public static String toHTML(String s) {
s = s.replaceAll("", "");
s = s.replaceAll(" ", " ");
s = s.replaceAll("", "");
s = s.replaceAll("", "");
s = s.replaceAll("\"", """);
s = s.replaceAll("\\\r\\\n", "br/");
s = s.replaceAll("\\\r", "br/");
s = s.replaceAll("\\\n", "br/");
return s;
}
public static String replaceStrAllNotBack(String str, String strSrc, String strDes) {
StringBuffer sb = new StringBuffer(str);
int index = 0;
while ((index = sb.indexOf(strSrc, index)) != -1) {
sb.replace(index, index + strSrc.length(), strDes);
index += strDes.length();
}
return sb.toString();
}
/**
* 读文件(使用默认编码)
*
* @param file
* @return 文件内容
* @throws IOException
*/
public static String readFile(File file, String charset) throws IOException {
InputStreamReader fr = new InputStreamReader(new FileInputStream(file), charset);
StringBuffer sb = new StringBuffer();
char[] bs = new char[1024];
int i = 0;
while ((i = fr.read(bs)) != -1) {
sb.append(bs, 0, i);
}
fr.close();
return sb.toString();
}
/**
* 写文件
*
* @param file
* @param string
* 字符串
* @param encoding
* 编码
* @return 文件大小
* @throws IOException
*/
public static int writeFile(File file, String string, String encoding) throws IOException {
FileOutputStream fos = new FileOutputStream(file);
try {
byte[] bs = string.getBytes(encoding);
fos.write(bs);
return bs.length;
} finally {
fos.close();
}
}
}
#打开"D:\content.html"文件看效果吧。
有什么问题可以联系我。
建立循环改变字符串内容 并用repain（）方法刷新窗体内容，用每次循环修改后的字符串替代上次刷新的字符串 即可时间字符串动画 望楼主采纳
