java基本的读写文件操作

  package com.hzsuwang.java;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.InputStream;
import java.io.InputStreamReader;

import junit.framework.TestCase;

/**
 * Unit test for simple App.
 */
public class AppTest extends TestCase {
    String filename = "/home/yan/temp/javastudy/javaio/src/test/java/com/hzsuwang/java/javaio.txt";
    /**
     * 写文件操作
     * 
     * @throws Exception
     */
    public void testReadTxt() throws Exception {

        System.out.println(filename);
        FileReader reader = new FileReader(filename);
        int l = 0;
        while ((l = reader.read()) != -1) {
            char type = (char) l;
            System.out.print(type);
        }
        reader.close();
        System.out.println("==================================");
        InputStream in = new FileInputStream(filename);
        InputStreamReader reader2 = new InputStreamReader(in);
        int l2 = 0;
        while ((l2 = reader2.read()) != -1) {
            char type = (char) l2;
            System.out.print(type);
        }
        reader2.close();
        in.close();
        System.out.println("==================================");
        FileReader reader3 = new FileReader(filename);
        BufferedReader bReader = new BufferedReader(reader3);
        String lineString = null;
        while ((lineString = bReader.readLine()) != null) {
            System.out.println(lineString);
        }
        bReader.close();
        reader3.close();
        System.out.println("==================================");

    }

    /**
     * 写文件操作
     * 
     * @throws Exception
     */
    public void testWriteTxt() throws Exception {
        FileWriter fileWriter = new FileWriter(filename, true);
        String str1 = "\r\nFileWriter test";
        fileWriter.write(str1);
        fileWriter.close();
        System.out.println("================写入文件完成==================");
        FileOutputStream output = new FileOutputStream(filename, true);
        String str2 = "\r\nFileOutputStream test";
        output.write(str2.getBytes());
        output.close();
        System.out.println("================写入文件完成==================");
        FileWriter fileWriter2 = new FileWriter(filename, true);
        BufferedWriter bufferedWriter = new BufferedWriter(fileWriter2);
        String str3 = "\r\nbufferedWriter test";
        bufferedWriter.write(str3);
        bufferedWriter.flush();
        bufferedWriter.close();
        System.out.println("================写入文件完成==================");

    }

    /**
     * copy文件操作
     * 
     * @throws Exception
     */
    public void testCopyFile() throws Exception {
        String src = "/home/yan/download/software/ideaIU-10.tar.gz";
        String desc = "/tmp/";
        File file = new File(src);
        FileInputStream fileInputStream = new FileInputStream(file);
        File dfileFile = new File(desc + file.getName());
        if (!dfileFile.exists()) {
            dfileFile.createNewFile();
        }
        FileOutputStream out = new FileOutputStream(dfileFile);
        BufferedOutputStream bufferedWriter = new BufferedOutputStream(out);
        byte[] bytes = new byte[1024];
        int wdata;
        while ((wdata = fileInputStream.read(bytes, 0, bytes.length)) != -1) {
            bufferedWriter.write(bytes, 0, wdata);
        }
        fileInputStream.close();
        out.close();
        bufferedWriter.close();
        System.out.println("================copy文件操作完成==================");
        dfileFile.delete();
    }

    /**
     * 移动文件操作
     * 
     * @throws Exception
     */
    public void testMoveFile() throws Exception {
        String src = "/home/yan/download/software/ideaIU-10.tar.gz";
        String desc = "/tmp/";
        File file = new File(src);        
        File dfileFile = new File(desc + file.getName());        
        if (!dfileFile.exists()) {
            dfileFile.createNewFile();
        }
        FileInputStream fileInputStream = new FileInputStream(file);
        FileOutputStream out = new FileOutputStream(dfileFile);
        BufferedOutputStream bufferedWriter = new BufferedOutputStream(out);
        byte[] bytes = new byte[1024];
        int wdata;
        while ((wdata = fileInputStream.read(bytes, 0, bytes.length)) != -1) {
            bufferedWriter.write(bytes, 0, wdata);
        }

        fileInputStream.close();
        out.close();
        bufferedWriter.close();
        file.delete();
        System.out.println("================移动文件操作完成==================");        

        if (!file.exists()) {
            file.createNewFile();
        }        
        FileInputStream restoreFileInputStream = new FileInputStream(dfileFile);
        FileOutputStream restoreOut = new FileOutputStream(file);
        BufferedOutputStream restoreBufferedWriter = new BufferedOutputStream(restoreOut);
        byte[] restoreBytes = new byte[1024];
        int restoreWdata;
        while ((restoreWdata = restoreFileInputStream.read(restoreBytes, 0, restoreBytes.length)) != -1) {
            restoreBufferedWriter.write(restoreBytes, 0, restoreWdata);
        }        
        restoreFileInputStream.close();
        restoreOut.close();
        restoreBufferedWriter.close();
        dfileFile.delete();
        System.out.println("================移动文件还原操作完成==================");






    }

}