Reader與FileReader概述

Reader與FileReader概述

字符輸入流讀取字符數(shù)據(jù)

package com.mujiachao.io;

import java.io.FileReader;
import java.io.IOException;

public class FileRead {
    public static void main(String[] args) throws IOException {
        FileReader fileRead = new FileReader("F:\\電影\\111\\F.txt");
        char[] chars=new char[1024];
        int len=0;
        while ((len=fileRead.read(chars))!=-1){
            System.out.println(new String(chars,0,3));
        }
        fileRead.close();

    }
}

字符輸出流

字符輸出流

字符輸出流的使用 必須使用flash（）或者 close()否則寫不入文件

字符輸出流的使用

package com.mujiachao.io;

import java.io.FileWriter;
import java.io.IOException;

public class FileWrit {
    public static void main(String[] args) throws IOException {
//        FileWriter fileWriter = new FileWriter("F:\\電影\\111\\F.txt", true);
        FileWriter fileWriter = new FileWriter("F:\\電影\\111\\F.txt");
        fileWriter.write("fdddddddddddddddd");
        fileWriter.flush();
        //包含      fileWriter.flush();
        fileWriter.close();
    }
}

close()與flash()方法的區(qū)別

close()與flash()方法的區(qū)別

字符輸出流寫數(shù)據(jù)的其他方法 5種

字符輸出流寫數(shù)據(jù)的其他方法 5種

package com.mujiachao.io;

import java.io.FileWriter;
import java.io.IOException;

public class FileWrit1 {
    public static void main(String[] args) throws IOException {
//        FileWriter fileWriter = new FileWriter("F:\\電影\\111\\F.txt", true);
        FileWriter fileWriter = new FileWriter("F:\\電影\\111\\F.txt");
        char[] chars={'f','g','h','1','4','y','o'};
        fileWriter.write(chars);
        fileWriter.write(chars,0,2);
        fileWriter.write("字符串");
        fileWriter.write("字符串",0,2);
        fileWriter.flush();
        //包含      fileWriter.flush();
        fileWriter.close();
    }
}

字符輸出流的續(xù)寫和換行

字符輸出流的續(xù)寫和換行

與字節(jié)輸出流一樣

使用try-catch-finally處理流中的異常

package com.mujiachao.io;

import java.io.FileWriter;
import java.io.IOException;

public class ChuLiLiuYiChang {
    public static void main(String[] args) {
//        FileWriter fileWriter = new FileWriter("F:\\電影\\111\\F.txt", true);
        FileWriter fileWriter = null;
        try {
            fileWriter = new FileWriter("F:\\電影\\111\\F.txt");
            fileWriter.write(56);
            fileWriter.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
        //包含      fileWriter.flush();
        finally {
            if (fileWriter != null) {
                try {
                    fileWriter.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

jdk7關(guān)于try-catch新特性

jdk7關(guān)于try-catch新特性

package com.mujiachao.io;

import java.io.FileWriter;
import java.io.IOException;

public class ChuLiLiuYiChang1 {
    public static void main(String[] args) {
        try (FileWriter fileWriter = new FileWriter("F:\\電影\\111\\F.txt")) {
            fileWriter.write(56);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}