JAVA 文件输入/输出流

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输入流：FileInputStream与FileReader
输出流：FileOutputStream与FileWriter

这里写图片描述

package cn.com.file;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;/** * FileInputStream类与FileOutputStream类<br> * 文件读与写 * @author wutz * */public class FileTest {    public static void main(String[] args) {        //1.先往文件中写入数据        try {            FileOutputStream out = new FileOutputStream(new File("C:/Users/wutz/Desktop/j2se/resource/test.txt"));            byte[] bt = "测试写入文件".getBytes();            out.write(bt);            out.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        //2.从文件中读取数据到控制台        try {            FileInputStream in = new FileInputStream(new File("C:/Users/wutz/Desktop/j2se/resource/test.txt"));            byte[] bt1 = new byte[1024];             int lenth = in.read(bt1);            System.out.println("文件中的信息是："+ new String(bt1,0,lenth));            in.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}

这里写图片描述

package cn.com.file;import java.io.File;import java.io.FileNotFoundException;import java.io.FileReader;import java.io.FileWriter;import java.io.IOException;/** * FileWriter类与FileReader类<br> * 文件读与写（处理字符流） * @author wutz * */public class FileTest {    public static void main(String[] args) {        //1.先往文件中写入数据        try {            FileWriter out = new FileWriter(new File("C:/Users/wutz/Desktop/j2se/resource/test.txt"));            String s = new String("测试FileWriter"                    + "123阿萨德");            out.write(s);            out.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        //2.从文件中读取数据到控制台        try {            FileReader in = new FileReader(new File("C:/Users/wutz/Desktop/j2se/resource/test.txt"));            char[] ch = new char[1024];            int lenth = in.read(ch);            System.out.println("文件中的信息是："+ new String(ch,0,lenth));            in.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}

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