day21

sf-1.txt

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+abcdabcd

sf.txt

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+abcdabcd

sf1.txt

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+loveCoding1loveCoding1

src/main/java/com/sf/day21/Test01.java

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+package com.sf.day21;
+
+import org.junit.Test;
+import java.io.*;
+
+/**
+ * 字节流
+ *
+ */
+public class Test01 {
+
+    @Test
+    public void t1() throws Exception {
+      FileInputStream fileInputStream =  new FileInputStream("D:\\a.txt");
+      //读取数据
+        int read = fileInputStream.read();
+        System.out.println((char) read);
+        int read1 = fileInputStream.read();
+        System.out.println((char) read1);
+        int read2 = fileInputStream.read();
+        System.out.println(read2);
+        fileInputStream.close();
+    }
+
+    @Test
+    public void t2() throws IOException {
+      FileInputStream fileInputStream =   new FileInputStream("D:\\a.txt");
+      int a;
+      while ((a = fileInputStream.read())!=-1){
+          System.out.print((char) a);
+      }
+      fileInputStream.close();
+    }
+
+
+    @Test
+    public void t3() throws IOException{
+        //创建流对象
+        FileInputStream fileInputStream = new FileInputStream("D:\\a.txt");
+        int len;
+        byte[] data = new byte[2];
+        while ((len = fileInputStream.read(data)) != -1){
+            //有效字符
+            System.out.println(new String(data,0,len));
+        }
+        //关闭资源
+        fileInputStream.close();
+    }
+
+    /**
+     * FileOutputStream、
+     * 将数据写到某一个文件中
+     */
+    @Test
+    public void t4() throws IOException {
+        FileOutputStream fileOutputStream = new FileOutputStream("sf.txt",true);
+        fileOutputStream.write(97);
+        fileOutputStream.write(98);
+        fileOutputStream.write(99);
+        fileOutputStream.write(100);
+        fileOutputStream.close();
+    }
+
+    @Test
+    public void t5() throws IOException {
+        FileOutputStream fileOutputStream = new FileOutputStream("sf1.txt",true);
+        String str = "loveCoding1";
+        byte[] bytes = str.getBytes();
+        fileOutputStream.write(bytes,0,bytes.length);
+        fileOutputStream.close();
+    }
+
+    /**
+     * 文件的复制
+     * 1.创建input
+     * 创建 out
+     *
+     * 思路：   文件（硬盘）  -- 输入   ----输出 硬盘
+     */
+    @Test
+    public void t6() throws IOException {
+        FileInputStream inputStream = new FileInputStream("sf.txt");
+        FileOutputStream outputStream = new FileOutputStream("sf-1.txt");
+        //读取文件
+        byte[] data = new byte[1024];
+        int len;
+        //有效长度
+        while ((len = inputStream.read(data)) != -1){
+            outputStream.write(data,0,len);
+        }
+        inputStream.close();
+        outputStream.close();
+        System.out.println("文件复制完成");
+    }
+
+
+    /**
+     * 缓冲流的效率测试
+     * 复制一个大文件
+     */
+    @Test
+    public void t7()  {
+        //当前时间
+        long startTime = System.currentTimeMillis();
+//        FileInputStream fileInputStream = new FileInputStream("D:\\a.txt");
+//        BufferedInputStream inputStream = new BufferedInputStream(fileInputStream);
+//        String srcPath = "D:\\ruanjian\\WeChat\\WeChat.exe";
+//        String destPath = "D:\\ruanjian\\WeChat\\01_WeChat.exe";
+        FileInputStream fis = null;
+        FileOutputStream fos = null;
+        try {
+            fis = new FileInputStream("D:\\ruanjian\\WeChat\\WeChat.exe");
+            fos = new FileOutputStream("D:\\ruanjian\\WeChat\\02_WeChat.exe");
+            //进行读写操作  创建一个指定容量的数组byte
+            byte[] data = new byte[1000];
+            int len;
+            while ((len = fis.read(data)) != -1){
+                fos.write(data,0,len);
+            }
+            System.out.println("复制完成");
+        } catch (FileNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        } finally {
+            try {
+                fis.close();
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+            try {
+                fos.close();
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        long endTime = System.currentTimeMillis();
+        System.out.println("当前花费的时间为====="+(endTime-startTime));
+
+    }
+
+    @Test
+    public void t8(){
+        long startTime = System.currentTimeMillis();
+        FileInputStream fis = null;
+        FileOutputStream fos = null;
+        BufferedInputStream bis = null;
+        BufferedOutputStream bos = null;
+//        fis = new FileInputStream("D:\\ruanjian\\WeChat\\WeChat.exe");
+//        fos = new FileOutputStream("D:\\ruanjian\\WeChat\\02_WeChat.exe");
+            try {
+                bis = new BufferedInputStream(new FileInputStream("D:\\ruanjian\\WeChat\\WeChat.exe"));
+                bos = new BufferedOutputStream(new FileOutputStream("D:\\ruanjian\\WeChat\\03_WeChat.exe"));
+                //读取数据
+                byte[] data = new byte[1000];
+                int len;
+                while ((len = bis.read(data)) != -1){
+                    bos.write(data,0,len);
+                }
+            } catch (FileNotFoundException e) {
+                throw new RuntimeException(e);
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            } finally {
+                try {
+                    bis.close();
+                    bos.close();
+                } catch (IOException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+        System.out.println("复制完成");
+        long endTime = System.currentTimeMillis();
+        System.out.println("缓存流所用的时间==="+(endTime-startTime));
+    }
+
+    /**
+     * 转换流
+     */
+    @Test
+    public void t9() throws IOException{
+        FileReader fileReader = new FileReader("D:\\File_GBK.txt");
+        int len;
+        while ((len = fileReader.read()) != -1){
+            System.out.println((char) len);
+        }
+        fileReader.close();
+    }
+
+
+    /**
+     * 转换流
+     */
+    @Test
+    public void t10() throws IOException {
+        //指定文件的路径
+        String fileName = "D:\\File_GBK.txt";
+        //创建流对象
+        InputStreamReader isr = new InputStreamReader(new FileInputStream(new File(fileName)),"UTF-8");
+        int charData;
+        while ((charData = isr.read()) !=-1){
+            System.out.println((char) charData);
+        }
+        isr.close();
+    }
+
+    /**
+     * 字符  -- 字节   根据指定的字符集、
+     * outputStreamWriter
+     */
+    @Test
+    public void  t11() throws IOException {
+        OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(new File("D:\\File_GBK.txt"),true), "UTF-8");
+        osw.write("我是中国人");
+        osw.close();
+        System.out.println("完成！！！！");
+    }
+
+
+}