字符拷贝和字节拷贝文件对比（FileInputStream，FileOutputStream, FileReader， FileWriter)

妖狐艹你老母 2022-08-22 14:28 83阅读 0赞

拷贝文件的思想就是*从源文件路径读取文件，然后往目标文件路径写入文件***！**

**两者区别：*字节流无缓冲区，字符流有缓冲区，必须关闭流（close操作）或者清空缓冲区（flush操作）才能写入成功***

**1:按字节拷贝文件（ FileInputStream，FileOutputStream）**

import java.io.FileInputStream;  
public class FileCopy  
\{  
    public static void main(String\[\] args)  
    \{  
          
        // 将  A 文件  拷贝到 B 文件  
        FileInputStream fis = null;  
        FileOutputStream fos = null;  
        try  
        \{  
            fis = new FileInputStream("C:\\\\Users\\\\User02\\\\Desktop\\\\io.png");  
            fos = new FileOutputStream("C:\\\\Users\\\\User02\\\\Desktop\\\\io.txt",true);  
            // 默认会覆盖原有的数据,如果想追加append  
            byte\[\] b = new byte\[10\];  
            int i = 0;  
            while((i = fis.read(b)) != -1)  
            \{  
                fos.write(b,0,i);  
            \}  
              
        \}  
        catch (Exception e)  
        \{  
            e.printStackTrace();  
        \}finally\{  
            if(fis != null)  
            \{  
                try  
                \{  
                    fis.close();  
                \}  
                catch (IOException e)  
                \{  
                    e.printStackTrace();  
                \}  
            \}  
              
            if(fos != null)  
            \{  
                try  
                \{  
                    fos.close();  
                \}  
                catch (IOException e)  
                \{  
                    e.printStackTrace();  
                \}  
            \}  
              
        \}  
          
    \}  
\}

**2:按字符拷贝文件（FileReader， FileWriter）**

import java.io.FileInputStream;  
  
public class TestFileReaderAndWriter  
\{  
    public static void main(String\[\] args)  
    \{  
          
        // 将  A 文件  拷贝到 B 文件  
        FileReader fr = null;  
        FileWriter fw = null;  
        try  
        \{  
            fr = new FileReader("src/com/itany/coreJava/day18/a.txt");  
            fw = new FileWriter("src/com/itany/coreJava/day18/b.txt");  
            // 默认会覆盖原有的数据,如果想追加append  
              
            System.out.println(fr.getEncoding());  
            char\[\] b = new char\[10\];  
            int i = 0;  
            while((i = fr.read(b)) != -1)  
            \{  
                fw.write(b,0,i);  
            \}  
              
        \}  
        catch (Exception e)  
        \{  
            e.printStackTrace();  
        \}finally\{  
            if(fw != null)  
            \{  
                try  
                \{  
                    fw.close();  
                \}  
                catch (IOException e)  
                \{  
                    e.printStackTrace();  
                \}  
            \}  
              
            if(fr != null)  
            \{  
                try  
                \{  
                    fr.close();  
                \}  
                catch (IOException e)  
                \{  
                    e.printStackTrace();  
                \}  
            \}  
              
        \}  
          
    \}  
\}