文件操作（顺带Word、Excel）~

package test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.RandomAccessFile;

public class FileAction {
	public static void main(String[] args) {
//		readFile("C:\Users\Administrator\Desktop\DOCUMENTS\lf.txt");
//		readSpeedFile("C:\Users\Administrator\Desktop\DOCUMENTS\淘宝API例子.txt");
//		appendMethodA("C:\Users\Administrator\Desktop\hehe.txt", "dhsakfhaoeijefo iajfcvoifvw\n\rsfcacvasd");
		copyFile("C:\Users\Administrator\Desktop\SOFTWARE\ElswordSkill_PB_SP1.exe","C:\Users\Administrator\Desktop\淘宝API例子.txt");
	}
	
	public static void createFile(){
		try {
			File path = new File("C:\Users\Administrator\Desktop");
			File te = new File(path,"hehe.txt");
			path.mkdirs();
			if(!te.exists()){
				te.createNewFile();
			}
		} catch (Exception e) {
			e.printStackTrace();
			
		}
	}
	
	public static void readFile(String file){
		InputStream in = null;
		try {
			System.out.println("以字节为单位读取文件内容，一次读一个字节：");
			in = new FileInputStream(file);
			int temp; 
			while((temp = in.read()) != -1){
				System.out.write(temp);
			}
			in.close();
		} catch (Exception e) {
			e.printStackTrace();
			return;
		} finally{
			try {
				in.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
	
	public static void readSpeedFile(String file){
		InputStream in = null;
		try {
			System.out.println("以字节为单位读取文件内容，一次读100个字节：");
			in = new FileInputStream(file);
			int temp; 
			byte[] tempbytes = new byte[100];
			while((temp = in.read(tempbytes)) != -1){
				System.out.write(tempbytes,0,temp);
			}
			in.close();
		} catch (Exception e) {
			e.printStackTrace();
			return;
		} finally{
			try {
				in.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
	
	/**
     * 随机读取文件内容
     */
    public static void readFileByRandomAccess(String fileName) {
        RandomAccessFile randomFile = null;
        try {
            System.out.println("随机读取一段文件内容：");
            // 打开一个随机拜访文件流，按只读方法
            randomFile = new RandomAccessFile(fileName, "r");
            // 文件长度，字节数
            long fileLength = randomFile.length();
            // 读文件的起始地位
            int beginIndex = (fileLength > 4) ? 4 : 0;
            // 将读文件的开端地位移到beginIndex地位。
            randomFile.seek(beginIndex);
            byte[] bytes = new byte[10];
            int byteread = 0;
            // 一次读10个字节，如果文件内容不足10个字节，则读剩下的字节。
            // 将一次读取的字节数赋给byteread
            while ((byteread = randomFile.read(bytes)) != -1) {
                System.out.write(bytes, 0, byteread);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (randomFile != null) {
                try {
                    randomFile.close();
                } catch (IOException e1) {
                }
            }
        }
    }
    
    /**
     * A办法追加文件：应用RandomAccessFile
     */
    public static void appendMethodA(String fileName, String content) {
        try {
            // 打开一个随机拜访文件流，按读写方法
            RandomAccessFile randomFile = new RandomAccessFile(fileName, "rw");
            // 文件长度，字节数
            long fileLength = randomFile.length();
            //将写文件指针移到文件尾。
            randomFile.seek(fileLength);
            randomFile.writeBytes(content);
            randomFile.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * B办法追加文件：应用FileWriter
     */
    public static void appendMethodB(String fileName, String content) {
        try {
            //打开一个写文件器，结构函数中的第二个参数true表现以追加情势写文件
            FileWriter writer = new FileWriter(fileName, true);
            writer.write(content);
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    public static void copyFile(String fileName, String fileName2) {
        try {
        	InputStream in = new FileInputStream(fileName);
        	OutputStream writer = new FileOutputStream(fileName2);
        	int len;
        	byte[] tempByte = new byte[100];
        	while((len=in.read(tempByte))!=-1){
        		System.out.write(tempByte,0,len);
        		writer.write(tempByte,0,len);
        	}
        	in.close();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
package test;

import java.io.File;
import java