Java IO 字节流 字符流

package com.demo.io;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class FileInputStream_demo {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根
		int b;
		FileInputStream inStream = null;
		FileOutputStream outStream = null;
		FileReader inReader = null;
		FileWriter outWriter = null;
		try {

			// 复制文件
			outStream = new FileOutputStream(
					"E:\\Resource code\\javabase\\kang bye bak.txt");

			inStream = new FileInputStream(
					"E:\\Resource code\\javabase\\kang bye.txt");
			while ((b = inStream.read()) != -1) {
				System.out.print((char) b);
				// 向文件写内容
				outStream.write(b);
			}

			// 复制文件
			outWriter = new FileWriter(
					"E:\\Resource code\\javabase\\再别康桥 复件.txt");

			inReader = new FileReader("E:\\Resource code\\javabase\\再别康桥.txt");
			while ((b = inReader.read()) != -1) {
				System.out.print((char) b);
				// 向文件写内容
				outWriter.write(b);
			}

			inStream.close();
			inReader.close();
			outStream.close();
			outWriter.close();
		} catch (IOException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
	}
}

package com.demo;

import java.io.FileWriter;
import java.io.IOException;

public class ConfigureFileWriter {

	/**
	 * @param args
	 * @throws IOException
	 * @throws IOException
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		FileWriter fileWriter = null;
		try {
			fileWriter = new FileWriter("conf.properties");
			fileWriter.write("dbDriver=oracle.jdbc.driver.OracleDriver");
			System.out.println("success");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			if (fileWriter != null) {
				try {
					fileWriter.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}
}

package com.demo;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class ConfigureFileReader {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		FileReader fileReader = null;
		try {
			fileReader = new FileReader("conf.properties");
			char[] chars = new char[64];
			int hasRead = 0;
			while ((hasRead = fileReader.read(chars)) > 0) {
				System.out.println(new String(chars, 0, hasRead));
			}
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally {
			if (fileReader != null) {
				try {
					fileReader.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}
}

package com.demo;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class ReadProperties {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub

		Properties props = new Properties();
		File f = new File("conf.properties");
		try {
			props.load(new FileInputStream(f));
			System.out.println(props.getProperty("dbDriver"));
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}  
	}
}