JAVA高级特性与实战项目第二章file I\0课后作业

1,复制文本并读取

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;


public class test {
	public static void main(String[] args) {
		File file = new File("C:\\source.txt");
		File file1 = new File("D:\\target.txt");
		FileWriter writer = null;
		FileReader reader = null;
		BufferedWriter bw = null;
		BufferedReader br = null;
		String str;
		StringBuffer sb = new StringBuffer();
		try {
			reader = new FileReader(file);
			br = new BufferedReader(reader);
			writer = new FileWriter(file1);
			bw = new BufferedWriter(writer);
			while ((str = br.readLine()) != null) {
				bw.write(str);
				bw.newLine();
				sb.append(str);
			}
			System.out.println("原文件内容为:" + sb);
			System.out.println("原文件大小:" + file.length() + "字节");
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				bw.close();
				writer.close();
				br.close();
				reader.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
		FileReader reader1 = null;
		BufferedReader br1 = null;
		String str1;
		StringBuffer sb1 = null;
		try {
			reader1 = new FileReader(file1);
			br1 = new BufferedReader(reader1);
			sb1 = new StringBuffer();
			while ((str1 = br1.readLine()) != null) {
				sb1.append(str1);
			}
			System.out.println("新文件内容为:" + sb1);
			System.out.println("新文件大小:" + file1.length() + "字节");
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			try {
				br1.close();
				reader1.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}

}


2.读取window.win.ini文件
package homework;

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

public class Demo1 {
	public static void main(String[] args) {
		Reader fr = null;
		StringBuffer sbf = null;
		try {
			fr = new FileReader("C:\\Windows\\win.ini");
			char ch[] = new char[1024];
			sbf = new StringBuffer();
			int lenght = fr.read(ch);
			while (lenght!=-1) {
				sbf.append(ch);
				lenght=fr.read();
			}
			System.out.println(ch);
		} catch(FileNotFoundException e) {
			e.printStackTrace();
		}
		
		catch (IOException e) {	
			e.printStackTrace();
		}finally {
			try {
				if (fr!=null) {
					fr.close();
				}
			}catch(IOException e) {
				e.printStackTrace();
			}
		}
	
}
}