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：");
            // 打开一个随机访问文件流，按只读方式
            randomFile = new RandomAccessFile(fileName, "r");
            // 文件长度，字节数
            long fileLength = randomFile.length();
            // 读文件的起始位置
            int beginIndex = (fileLength > 4) ? 4 : 0;
            // 将读文件的开始位置移到beginIndex位置。
            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方法追加文件：使用RandomAccessFile
     */
    public static void appendMethodA(String fileName, String content) {
        try {
            // 打开一个随机访问文件流，按读写方式
            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方法追加文件：使用FileWriter
     */
    public static void appendMethodB(String fileName, String content) {
        try {
            //打开一个写文件器，构造函数中的第二个参数true表示以追加形式写文件
            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();
        }
    }
}

 顺带word的↓

 

package test;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.poi.hwpf.extractor.WordExtractor;
import org.apache.poi.poifs.filesystem.DirectoryEntry;
import org.apache.poi.poifs.filesystem.DocumentEntry;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;

public class TestPoi {
	/**
	 * 测试
	 * @param args
	 * @throws Exception
	 */
	public static void main(String args[]) throws Exception{
		String path = "C:"+File.separator+"Users"+File.separator+"Administrator"+File.separator+"Desktop"+File.separator+"134.doc";
//		writeDoc(path, "TestTestTestTestTestTestTest");
		String str = readDoc("C:"+File.separator+"Users"+File.separator+"Administrator"+File.separator+"Desktop"+File.separator+"134.doc");
		System.out.println(str);
	}
	
	/**
	 * 读入doc
	 * @param doc
	 * @return
	 * @throws Exception
	 */
	public static String readDoc(String doc) throws Exception {
		// 创建输入流读取DOC文件
		FileInputStream in = new FileInputStream(new File(doc));
		WordExtractor extractor = null;
		String text = null;
		// 创建WordExtractor
		extractor = new WordExtractor(in);
		// 对DOC文件进行提取
		text = extractor.getText();
		return text;
	}
	
	/**
	 * 写出doc
	 * @param path
	 * @param content
	 * @return
	 */
	public static boolean writeDoc(String path, String content) { 
		boolean w = false; 
		try { 
			
			// byte b[] = content.getBytes("ISO-8859-1"); 
			byte b[] = content.getBytes(); 
			
			ByteArrayInputStream bais = new ByteArrayInputStream(b); 
			
			POIFSFileSystem fs = new POIFSFileSystem(); 
			DirectoryEntry directory = fs.getRoot(); 
			
			DocumentEntry de = directory.createDocument("WordDocument", bais); 
			
			FileOutputStream ostream = new FileOutputStream(path); 
			
			fs.writeFilesystem(ostream); 
			
			bais.close(); 
			ostream.close(); 
			
		} catch (IOException e) { 
			e.printStackTrace(); 
		} 
		return w; 
	} 
	
}

 Excel滴↓

public static void main(String[] args) {
		try {
			String[] head = {"name", "addr", "age"};
			String[][] cont = {{"(^o^)~1", "(^o^)~1", "(^o^)~1"}, {"(^o^)~2", "(^o^)~2", "(^o^)~2"}};
			OutputStream writer = new FileOutputStream("C:\\Users\\Administrator\\Desktop\\hehe.xls");
			WritableWorkbook workbook = Workbook.createWorkbook(writer);
	        //创建新的一页
	        WritableSheet sheet = workbook.createSheet("First Sheet",0);
	        for(int n = 0; n < head.length; n++){
				Label content = new Label(n, 0, head[n]);
				sheet.addCell(content);
			}
	        //标题和内容分开，也可以不分
	        for (int i = 1; i < cont.length + 1; i++) {
	        	for(int j = 0; j < cont[0].length; j++){
	        		Label content = new Label(j, i, cont[i - 1][j]);
	        		sheet.addCell(content);
	        	}
			}
	        workbook.write();
        	workbook.close();
            writer.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
}