java文本替换（单文件）

Java代码 1. import java.io.BufferedReader; 2. import java.io.BufferedWriter; 3. import java.io.File; 4. import java.io.FileNotFoundException; 5. import java.io.FileReader; 6. import java.io.FileWriter; 7. import java.io.IOException; 8. 9. public class StringRpl { 10. 11. public static String read(File src) { 12. StringBuffer res = new StringBuffer(); 13. String line = null; 14. try { 15. BufferedReader reader = new BufferedReader(new FileReader(src)); 16. while ((line = reader.readLine()) != null) { 17. res.append(line + "/n"); 18. } 19. reader.close(); 20. } catch (FileNotFoundException e) { 21. e.printStackTrace(); 22. } catch (IOException e) { 23. e.printStackTrace(); 24. } 25. return res.toString(); 26. } 27. 28. public static boolean write(String cont, File dist) { 29. try { 30. BufferedWriter writer = new BufferedWriter(new FileWriter(dist)); 31. writer.write(cont); 32. writer.flush(); 33. writer.close(); 34. return true; 35. } catch (IOException e) { 36. e.printStackTrace(); 37. return false; 38. } 39. } 40. 41. public StringRpl() { 42. } 43. 44. public static void main(String[] args) { 45. File src = new File("a.txt"); 46. String cont = StringRpl.read(src); 47. System.out.println(cont); 48. // 对得到的内容进行处理 49. cont = cont.replaceAll("public", "private"); 50. System.out.println(cont); 51. // 更新源文件 52. System.out.println(StringRpl.write(cont, src)); 53. } 54. 55. }

替换结果：Java代码 1. import java.io.BufferedReader; 2. import java.io.BufferedWriter; 3. import java.io.File; 4. import java.io.FileNotFoundException; 5. import java.io.FileReader; 6. import java.io.FileWriter; 7. import java.io.IOException; 8. 9. private class StringRpl { 10. 11. private static String read(File src) { 12. StringBuffer res = new StringBuffer(); 13. String line = null; 14. try { 15. BufferedReader reader = new BufferedReader(new FileReader(src)); 16. while ((line = reader.readLine()) != null) { 17. res.append(line + "/n"); 18. } 19. reader.close(); 20. } catch (FileNotFoundException e) { 21. e.printStackTrace(); 22. } catch (IOException e) { 23. e.printStackTrace(); 24. } 25. return res.toString(); 26. } 27. 28. private static boolean write(String cont, File dist) { 29. try { 30. BufferedWriter writer = new BufferedWriter(new FileWriter(dist)); 31. writer.write(cont); 32. writer.flush(); 33. writer.close(); 34. return true; 35. } catch (IOException e) { 36. e.printStackTrace(); 37. return false; 38. } 39. } 40. 41. private StringRpl() { 42. } 43. 44. private static void main(String[] args) { 45. File src = new File("a.txt"); 46. String cont = StringRpl.read(src); 47. System.out.println(cont); 48. // 对得到的内容进行处理 49. cont = cont.replaceAll("private", "private"); 50. System.out.println(cont); 51. // 更新源文件 52. System.out.println(StringRpl.write(cont, src)); 53. } 54. 55. } 56. 57. true import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;private class StringRpl {private static String read(File src) {StringBuffer res = new StringBuffer();String line = null;try {BufferedReader reader = new BufferedReader(new FileReader(src));while ((line = reader.readLine()) != null) {res.append(line + "/n");}reader.close();} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}return res.toString();}private static boolean write(String cont, File dist) {try {BufferedWriter writer = new BufferedWriter(new FileWriter(dist));writer.write(cont);writer.flush();writer.close();return true;} catch (IOException e) {e.printStackTrace();return false;}}private StringRpl() {}private static void main(String[] args) {File src = new File("a.txt");String cont = StringRpl.read(src);System.out.println(cont);// 对得到的内容进行处理cont = cont.replaceAll("private", "private");System.out.println(cont);// 更新源文件System.out.println(StringRpl.write(cont, src));}}true