Java IO流的几个简单的例子.docx

Java 流的几个简单的例子文章分类:Java编程 Java代码 1. packagestep2_io; 2. 3. importjava.io.FileInputStream; 4. importjava.io.FileNotFoundException; 5. importjava.io.FileOutputStream; 6. importjava.io.IOException; 7. 8. /* 9. * 10. *author 11. * 12. *这只能测试字节流,所以文件中有中文字的时候,是输出不来的哦! 13. */14. publicclassTestFileInputStream 15. 16. publicstaticvoidmain(Stringargs) 17. intb; 18. FileInputStreamfis=null; 19. 20. /* 21. /(1)建立读取文件的流 22. try 23. fis=newFileInputStream(D:ExperimenteclipseTestIo.txt); 24. catch(FileNotFoundExceptione) 25. 26. e.printStackTrace(); 27. 28. 29. /(2)把文件的内容读进来,在控制台上写出来 30. try 31. while(b=fis.read()!=-1) 32. System.out.print(char)b); 33. 34. catch(IOExceptione) 35. 36. e.printStackTrace(); 37. 38. /(3)把文件流关闭上 39. 40. try 41. fis.close(); 42. catch(IOExceptione) 43. 44. e.printStackTrace(); 45. 46. */47. 48. /以上的方法都是用Print来输出内容 49. 50. /我们在这里尝试用FileOutputStream来做实验 51. /把TestIo这文件的内容读入到程序里,程序把它写出到test.txt文件中! 52. FileOutputStreamfos=null; 53. 54. try 55. fis=newFileInputStream(D:ExperimenteclipseTestIo.txt); 56. fos=newFileOutputStream(D:Experimenteclipsetest.txt); 57. while(b=fis.read()!=-1) 58. fos.write(b); 59. 60. catch(Exceptione) 61. e.printStackTrace(); 62. 63. 64. try 65. fis.close(); 66. fos.close(); 67. catch(IOExceptione) 68. /TODOAuto-generatedcatchblock 69. e.printStackTrace(); 70. 71. 72. 73. 74. package step2_io;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;/* * * author * *这只能测试字节流,所以文件中有中文字的时候,是输出不来的哦! */public class TestFileInputStream public static void main(String args) int b;FileInputStream fis = null;/*/(1) 建立读取文件的流try fis = new FileInputStream(D:ExperimenteclipseTestIo.txt); catch (FileNotFoundException e) e.printStackTrace();/(2)把文件的内容读进来,在控制台上写出来try while(b=fis.read()!=-1) System.out.print(char)b); catch (IOException e) e.printStackTrace();/(3)把文件流关闭上try fis.close(); catch (IOException e) e.printStackTrace();*/以上的方法都是用Print来输出内容/我们在这里尝试用FileOutputStream来做实验/把TestIo这文件的内容读入到程序里,程序把它写出到test.txt文件中!FileOutputStream fos = null; try fis = new FileInputStream(D:ExperimenteclipseTestIo.txt);fos = new FileOutputStream(D:Experimenteclipsetest.txt);while(b=fis.read()!=-1) fos.write(b); catch (Exception e) e.printStackTrace();try fis.close();fos.close(); catch (IOException e) / TODO Auto-generated catch blocke.printStackTrace();Java代码 1. packagestep2_io; 2. 3. importjava.io.FileNotFoundException; 4. importjava.io.FileReader; 5. importjava.io.FileWriter; 6. importjava.io.IOException; 7. 8. publicclassTestFileReader 9. 10. publicstaticvoidmain(Stringargs) 11. FileReaderfr=null; 12. /添加FileWriter 13. FileWriterfw=null; 14. intb; 15. 16. /(1)把文件读进来 17. try 18. fr=newFileReader(D:ExperimenteclipseTestIo.txt); 19. fw=newFileWriter(D:Experimenteclipsetest.txt); 20. /(2)把文件的内容写出去 21. while(b=fr.read()!=-1) 22. /System.out.print(char)b); 23. fw.write(char)b); 24. 25. 26. catch(Exceptione) 27. e.printStackTrace(); 28. 29. 30. 31. /(3)流关闭 32. try 33. fr.close(); 34. fw.close(); 35. catch(IOExceptione) 36. e.printStackTrace(); 37. 38. 39. 40. package step2_io;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;public class TestFileReader public static void main(String args) FileReader fr = null;/添加FileWriterFileWriter fw = null;int b;/(1)把文件读进来try fr = new FileReader(D:ExperimenteclipseTestIo.txt);fw = new FileWriter(D:Experimenteclipsetest.txt);/(2)把文件的内容写出去while(b=fr.read()!=-1) /System.out.print(char)b);fw.write(char)b); catch (Exception e) e.printStackTrace();/(3)流关闭try fr.close();fw.close(); catch (IOException e) e.printStackTrace();下面是处理流的缓冲流的例子:Java代码 1. packagestep2_io; 2. 3. importjava.io.BufferedInputStream; 4. importjava.io.BufferedReader; 5. importjava.io.FileInputStream; 6. importjava.io.FileNotFoundException; 7. importjava.io.FileReader; 8. importjava.io.IOException; 9. 10. publicclassTestBufferStream 11. 12. publicstaticvoidmain(Stringargs) 13. 14. intb; 15. Strings; 16. /BufferedInputStreambis=null; 17. BufferedReaderbis=null; 18. try 19. FileReaderfis=newFileReader(D:ExperimenteclipseTestIo.txt); 20. bis=newBufferedReader(fis); 21. 22. /while(b=bis.read()!=-1) 23. /System.out.print(char)b); 24. / 25. while(s=bis.readLine()!=null) 26. System.out.print(s); 27. 28. catch(Exceptione) 29. e.printStackTrace(); 30. 31. 32. try 33. bis.close(); 34. catch(IOExceptione) 35. e.printStackTrace(); 36. 37. 38. 39. package step2_io;import java.io.BufferedInputStream;import java.io.BufferedReader;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.IOException;public class TestBufferStream public static void main(String args) int b;String s;/BufferedInputStream bis = null;BufferedReader bis = null;try FileReader fis = new FileReader(D:ExperimenteclipseTestIo.txt);bis = new BufferedReader(fis);/while(b=bis.read()!= -1) /System.out.print(char)b);/while(s=bis.readLine()!=null) System.out.print(s); catch (Exception e) e.printStackTrace();try bis.close(); catch (IOException e) e.printStackTrace();Java代码 1. publicclassTestIn 2. publicstaticvoidmain(Stringargs) 3. 4. BufferedWriterbw=null; 5. Strings; 6. BufferedReaderbf=null; 7. PrintWriterpw=null; 8. 9. try 10. bf=newBufferedReader(newInputStreamReader(System.in); 11. bw=newBufferedWriter(newFileWriter(D:Experimenteclipsetest.txt); 12. /pw=newPrintWriter(newBufferedWriter(newFileWriter(D:Experimenteclipsetest.txt); 13. ca