javaIO（四）字符流

字符流主要对于处理文本内容的读写十分的方便，按照字符的输入和输出和字节流操作上没有区别，但是在读取和写入时的操作单位不再是byte。

 

 

一、文件输入流FileReader，读取文件内容：

 

package io.charput;

import java.io.File;
import java.io.FileReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class FilePathDemo {
	public static void main(String[] args) {
		String fileName = "F:" + File.separator + "test.txt";
		String content = readStrFormFile(fileName);
		System.out.println(content);
	}

	public static String readStrFormFile(String fileName) {
		try {
			FileReader fr = new FileReader(fileName);
			char[] chars = new char[512];
			int len = fr.read(chars);
			fr.close();
			return new String(chars, 0, len);
		} catch (Exception e) {

			// TODO Auto-generated catch block

			e.printStackTrace();
		}
		return "";
	}
}

 

 

 

 

 

二、文件输出流FileWriter，向文件写入内容：

 

package io.charput;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;



public class FilePathDemo1 {

	public static void main(String[] args) {
		String path = FileReader.class.getResource("/").getFile();
		String fileName = path + "/test.data";
		String[] words={" Lily,女,14","Lucy,女,15","Lilei,男,16"};
		writeStr2File(fileName, words);
		String content=readStrFormFile(fileName);
		System.out.println(content);

	}

	public static String readStrFormFile(String fileName) {

		try {
			FileReader fr = new FileReader(fileName);
			char[] chars = new char[512];
			int len = -1;
			String str = "";
     		while ( (len=fr.read(chars)) != -1 ) {
				str += new String(chars, 0, len);
			}
			fr.close();
			return str;
		} catch (Exception e) {
			e.printStackTrace();

		}
		return "";

	}

	public static void writeStr2File(String fileName,String[] content) {
		try {
			FileWriter fw = new FileWriter(fileName);

			for (String str : content) {

				fw.write(str + "\r\n");
			}
			fw.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
}