主要使用的是java.util.Robot类来捕获屏幕,可以实现对屏幕一个矩形区域的捕获,通过这个类,我们也可以实现一个远程桌面控制的程序。

1. package com.qiu.util;
   
2. import java.io.*;
   
3. import java.net.*;
   
4. import javax.swing.*;
   
5. import java.awt.*;
   
6. import java.awt.event.*;
   
7. import java.awt.image.*;
   
8. import javax.imageio.*;
   
9. import java.io.*;
   
10. /*
    
11. 一个简单的屏幕抓图
    
12. */
    
13. public class ScreenCapture {
    
14. //test main
    
15. public static void main(String[] args) throws Exception{
    
16. String userdir = System.getProperty("user.dir");
    
17. File tempFile = new File("d:","temp.png");
    
18. ScreenCapture capture = ScreenCapture.getInstance();
    
19. capture.captureImage();
    
20. JFrame frame = new JFrame();
    
21. JPanel panel = new JPanel();
    
22. panel.setLayout(new BorderLayout());
    
23. JLabel imagebox = new JLabel();
    
24. panel.add(BorderLayout.CENTER,imagebox);
    
25. imagebox.setIcon(capture.getPickedIcon());
    
26. capture.saveToFile(tempFile);
    
27. capture.captureImage();
    
28. imagebox.setIcon(capture.getPickedIcon());
    
29. frame.setContentPane(panel);
    
30. frame.setSize(400,300);
    
31. frame.show();
    
32. System.out.println("Over");
    
33. }
    
34. private ScreenCapture() {
    
35. try{
    
36. robot = new Robot();
    
37. }
    
38. catch(AWTException e) {
    
39. System.err.println("Internal Error: " + e);
    
40. e.printStackTrace();
    
41. }
    
42. JPanel cp = (JPanel)dialog.getContentPane();
    
43. cp.setLayout(new BorderLayout());
    
44. labFullScreenImage.addMouseListener(new MouseAdapter() {
    
45. public void mouseReleased(MouseEvent evn) {
    
46. isFirstPoint = true;
    
47. pickedImage = fullScreenImage.getSubimage(recX,recY,recW,recH);
    
48. dialog.setVisible(false);
    
49. }
    
50. });
    
51. labFullScreenImage.addMouseMotionListener(new MouseMotionAdapter() {
    
52. public void mouseDragged(MouseEvent evn) {
    
53. if(isFirstPoint) {
    
54. x1 = evn.getX();
    
55. y1 = evn.getY();
    
56. isFirstPoint = false;
    
57. }
    
58. else {
    
59. x2 = evn.getX();
    
60. y2 = evn.getY();
    
61. int maxX = Math.max(x1,x2);
    
62. int maxY = Math.max(y1,y2);
    
63. int minX = Math.min(x1,x2);
    
64. int minY = Math.min(y1,y2);
    
65. recX = minX;
    
66. recY = minY;
    
67. recW = maxX-minX;
    
68. recH = maxY-minY;
    
69. labFullScreenImage.drawRectangle(recX,recY,recW,recH);
    
70. }
    
71. }
    
72. public void mouseMoved(MouseEvent e) {
    
73. labFullScreenImage.drawCross(e.getX(),e.getY());
    
74. }
    
75. });
    
76. cp.add(BorderLayout.CENTER,labFullScreenImage);
    
77. dialog.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
    
78. dialog.setAlwaysOnTop(true);
    
79. dialog.setMaximumSize(
    
80. Toolkit.getDefaultToolkit().getScreenSize());
    
81. dialog.setUndecorated(true);
    
82. dialog.setSize(dialog.getMaximumSize());
    
83. dialog.setModal(true);
    
84. }
    
85. //Singleton Pattern
    
86. public static ScreenCapture getInstance() {
    
87. return defaultCapturer;
    
88. }
    
89. /*
    
90. 捕捉全屏慕
    
91. */
    
92. public Icon captureFullScreen() {
    
93. fullScreenImage = robot.createScreenCapture(new Rectangle(
    
94. Toolkit.getDefaultToolkit().getScreenSize()));
    
95. ImageIcon icon = new ImageIcon(fullScreenImage);
    
96. return icon;
    
97. }
    
98. /*
    
99. 捕捉屏幕的一个矫形区域
    
100. */
     
101. public void captureImage() {
     
102. fullScreenImage = robot.createScreenCapture(new Rectangle(
     
103. Toolkit.getDefaultToolkit().getScreenSize()));
     
104. ImageIcon icon = new ImageIcon(fullScreenImage);
     
105. labFullScreenImage.setIcon(icon);
     
106. dialog.setVisible(true);
     
107. }
     
108. /*
     
109. 得到捕捉后的BufferedImage
     
110. */
     
111. public BufferedImage getPickedImage() {
     
112. return pickedImage;
     
113. }
     
114. /*
     
115. 得到捕捉后的Icon
     
116. */
     
117. public ImageIcon getPickedIcon() {
     
118. return new ImageIcon(getPickedImage());
     
119. }
     
120. /*
     
121. 储存为一个文件,为PNG格式
     
122. @deprecated
     
123. replaced by saveAsPNG(File file)
     
124. */
     
125. @Deprecated
     
126. public void saveToFile(File file) throws IOException{
     
127. ImageIO.write(getPickedImage(),defaultImageFormater,file);
     
128. }
     
129. /*
     
130. 储存为一个文件,为PNG格式
     
131. */
     
132. public void saveAsPNG(File file) throws IOException {
     
133. ImageIO.write(getPickedImage(),"png",file);
     
134. }
     
135. /*
     
136. 储存为一个JPEG格式图像文件
     
137. */
     
138. public void saveAsJPEG(File file) throws IOException {
     
139. ImageIO.write(getPickedImage(),"JPEG",file);

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主要使用的是java.util.Robot类来捕获屏幕,可以实现对屏幕一个矩形区域的捕获,通过这个类,我们也可以实现一个远程桌面控制的程序。

1. package com.qiu.util;
   
2. import java.io.*;
   
3. import java.net.*;
   
4. import javax.swing.*;
   
5. import java.awt.*;
   
6. import java.awt.event.*;
   
7. import java.awt.image.*;
   
8. import javax.imageio.*;
   
9. import java.io.*;
   
10. /*
    
11. 一个简单的屏幕抓图
    
12. */
    
13. public class ScreenCapture {
    
14. //test main
    
15. public static void main(String[] args) throws Exception{
    
16. String userdir = System.getProperty("user.dir");
    
17. File tempFile = new File("d:","temp.png");
    
18. ScreenCapture capture = ScreenCapture.getInstance();
    
19. capture.captureImage();
    
20. JFrame frame = new JFrame();
    
21. JPanel panel = new JPanel();
    
22. panel.setLayout(new BorderLayout());
    
23. JLabel imagebox = new JLabel();
    
24. panel.add(BorderLayout.CENTER,imagebox);
    
25. imagebox.setIcon(capture.getPickedIcon());
    
26. capture.saveToFile(tempFile);
    
27. capture.captureImage();
    
28. imagebox.setIcon(capture.getPickedIcon());
    
29. frame.setContentPane(panel);
    
30. frame.setSize(400,300);
    
31. frame.show();
    
32. System.out.println("Over");
    
33. }
    
34. private ScreenCapture() {
    
35. try{
    
36. robot = new Robot();
    
37. }
    
38. catch(AWTException e) {
    
39. System.err.println("Internal Error: " + e);
    
40. e.printStackTrace();
    
41. }
    
42. JPanel cp = (JPanel)dialog.getContentPane();
    
43. cp.setLayout(new BorderLayout());
    
44. labFullScreenImage.addMouseListener(new MouseAdapter() {
    
45. public void mouseReleased(MouseEvent evn) {
    
46. isFirstPoint = true;
    
47. pickedImage = fullScreenImage.getSubimage(recX,recY,recW,recH);
    
48. dialog.setVisible(false);
    
49. }
    
50. });
    
51. labFullScreenImage.addMouseMotionListener(new MouseMotionAdapter() {
    
52. public void mouseDragged(MouseEvent evn) {
    
53. if(isFirstPoint) {
    
54. x1 = evn.getX();
    
55. y1 = evn.getY();
    
56. isFirstPoint = false;
    
57. }
    
58. else {
    
59. x2 = evn.getX();
    
60. y2 = evn.getY();
    
61. int maxX = Math.max(x1,x2);
    
62. int maxY = Math.max(y1,y2);
    
63. int minX = Math.min(x1,x2);
    
64. int minY = Math.min(y1,y2);
    
65. recX = minX;
    
66. recY = minY;
    
67. recW = maxX-minX;
    
68. recH = maxY-minY;
    
69. labFullScreenImage.drawRectangle(recX,recY,recW,recH);
    
70. }
    
71. }
    
72. public void mouseMoved(MouseEvent e) {
    
73. labFullScreenImage.drawCross(e.getX(),e.getY());
    
74. }
    
75. });
    
76. cp.add(BorderLayout.CENTER,labFullScreenImage);
    
77. dialog.setCursor(Cursor.getPredefinedCursor(Cursor.CROSSHAIR_CURSOR));
    
78. dialog.setAlwaysOnTop(true);
    
79. dialog.setMaximumSize(
    
80. Toolkit.getDefaultToolkit().getScreenSize());
    
81. dialog.setUndecorated(true);
    
82. dialog.setSize(dialog.getMaximumSize());
    
83. dialog.setModal(true);
    
84. }
    
85. //Singleton Pattern
    
86. public static ScreenCapture getInstance() {
    
87. return defaultCapturer;
    
88. }
    
89. /*
    
90. 捕捉全屏慕
    
91. */
    
92. public Icon captureFullScreen() {
    
93. fullScreenImage = robot.createScreenCapture(new Rectangle(
    
94. Toolkit.getDefaultToolkit().getScreenSize()));
    
95. ImageIcon icon = new ImageIcon(fullScreenImage);
    
96. return icon;
    
97. }
    
98. /*
    
99. 捕捉屏幕的一个矫形区域
    
100. */
     
101. public void captureImage() {
     
102. fullScreenImage = robot.createScreenCapture(new Rectangle(
     
103. Toolkit.getDefaultToolkit().getScreenSize()));
     
104. ImageIcon icon = new ImageIcon(fullScreenImage);
     
105. labFullScreenImage.setIcon(icon);
     
106. dialog.setVisible(true);
     
107. }
     
108. /*
     
109. 得到捕捉后的BufferedImage
     
110. */
     
111. public BufferedImage getPickedImage() {
     
112. return pickedImage;
     
113. }
     
114. /*
     
115. 得到捕捉后的Icon
     
116. */
     
117. public ImageIcon getPickedIcon() {
     
118. return new ImageIcon(getPickedImage());
     
119. }
     
120. /*
     
121. 储存为一个文件,为PNG格式
     
122. @deprecated
     
123. replaced by saveAsPNG(File file)
     
124. */
     
125. @Deprecated
     
126. public void saveToFile(File file) throws IOException{
     
127. ImageIO.write(getPickedImage(),defaultImageFormater,file);
     
128. }
     
129. /*
     
130. 储存为一个文件,为PNG格式
     
131. */
     
132. public void saveAsPNG(File file) throws IOException {
     
133. ImageIO.write(getPickedImage(),"png",file);
     
134. }
     
135. /*
     
136. 储存为一个JPEG格式图像文件
     
137. */
     
138. public void saveAsJPEG(File file) throws IOException {
     
139. ImageIO.write(getPickedImage(),"JPEG",file);

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