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 blocke.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();}}}