IO 流小结

 

 

 

 

 

 

 

 

 

 

打印流：

 

 

 

 

 

输出方向可分为：输入流和输出流。

读取的单位可分为：字节流和字符流。

节点流：是指输出输入的管道直接和数据源连接。。。。

处理流：是指输出输入管道被其他管道包裹着，不是和数据源直接连接，起缓冲作用的，也就是进行了处理。。。（转换流，数据流，有例子，有代码）

 这些知识点不用背，不然绝对会弄混的。。。。。只有多在实际中应用才能记得更牢。。。。

代码摆在这，回头哪天忘了再看看。。。哎 

 

FileInputStream小实例：

package heng.java.IO;import java.io.FileInputStream;import java.io.FileNotFoundException;public class TestFileInputStream {public static void main(String[] args) {int b = 0;FileInputStream in = null;try {in = new FileInputStream("e:\\Order\\TCPTwoTalkClient.java");long num = 0;while((b=in.read()) != -1){System.out.print((char)b);num++;}in.close();System.out.println("共读取了"+num+"个字节");} catch (Exception e) {System.out.println("找不到指定文件");System.exit(-1);//非正常退出程序}}}

FileOutputStream小实例：

package heng.java.IO;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;public class TestFileOutputStream {public static void main(String[] args) {int b = 0;FileInputStream in = null;FileOutputStream out = null;try {in = new FileInputStream("e:\\Order\\TCPTwoTalkClient.java");out = new FileOutputStream("e:\\Order\\TCPTwoTalkClient副本.java");while((b=in.read()) != -1){out.write(b);}in.close();out.close();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println("文件已复制");}}

FileReader小实例：

package heng.java.IO1;import java.io.FileNotFoundException;import java.io.FileReader;/** * 字符流，可以打印出字符 * @author Administrator * */public class TestFileReader {public static void main(String[] args) {FileReader fr = null;int c = 0;try {fr = new FileReader("e:\\Order\\TCPTwoTalkClient.java");int len = 0;while((c = fr.read()) != -1){System.out.print((char)c);}fr.close();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

FileWriter小实例：

package heng.java.IO1;import java.io.FileReader;import java.io.FileWriter;public class TestFileWriter {public static void main(String[] args) {FileWriter fw = null;FileReader fr = null;int c = 0;try {fr = new FileReader("e:\\Order\\TCPTwoTalkClient.java");fw = new FileWriter("e:\\Order\\TCPTwoTalkClient副本2.java");while((c = fr.read()) != -1){fw.write(c);}fr.close();fw.close();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}System.out.println("文件复制成功");}}

 

BufferedInputStreamStream小实例：

package heng.java.IO2;import java.io.BufferedInputStream;import java.io.FileInputStream;import java.io.FileNotFoundException;public class TestBufferStream {public static void main(String[] args) {FileInputStream fis = null;BufferedInputStream bis = null;try {fis = new FileInputStream("e:\\Order\\TCPTwoTalkClient.java");bis = new BufferedInputStream(fis);int c = 0;System.out.println(bis.read());System.out.println(bis.read());bis.mark(100);//做标记，从100开始读for(int i=0; i<=10 && (c = bis.read())!=-1; i++){System.out.print((char)c + " ");}System.out.println();bis.reset();//返回做过标记的地方for(int i=0; i<=10 && (c=bis.read())!=-1; i++){System.out.print((char)c + " ");}bis.close();} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}

BufferedWriter和BufferedReader小实例：

package heng.java.IO2;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.FileReader;import java.io.FileWriter;public class TestBufferStream1 {public static void main(String[] args) {BufferedWriter bw = null;BufferedReader br = null;try {bw = new BufferedWriter(new FileWriter("e:\\Order\\TCPTwoTalkClient副本3_1.java"));br = new BufferedReader(new FileReader("e:\\Order\\TCPTwoTalkClient副本3_1.java"));String s = null;for(int i=1; i<=100; i++){s = String.valueOf(Math.random());bw.write(s);bw.newLine();//换行}bw.flush();while((s=br.readLine()) != null){System.out.println(s);}bw.close();br.close();} catch (Exception e) {e.printStackTrace();}}}