缓存式的字符输入输出流

前一篇讲了文件的字符输入输出流，但是最终还是要一个字符一个字符的读取和写入。缓存式的字符输入输出流BufferedReader    BufferedWriter里面有方法是按照一行一行的进行读和写的。

一、BufferedReader

实体类：

package io.buffer;public class StudentInfo {private String name;private String stuNo;private String claName;public StudentInfo( String name,String stuNo, String claName) {this.name=name;this.stuNo=stuNo;this.claName=claName;}public String getStuNo() {return stuNo;}public void setStuNo(String stuNo) {this.stuNo = stuNo;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getClaName() {return claName;}public void setClaName(String claName) {this.claName = claName;}@Overridepublic String toString() {return name+","+stuNo+","+claName;}}

操作类：

package io.buffer;import java.io.*;import java.util.*;public class StudentInfoReader {public static void main(String[] args) {//String path = FileReader.class.getResource("/").getFile();String fileName = "F:" + File.separator + "test.txt";List<StudentInfo> stuls =readStudentInfo(fileName);System.out.println(stuls.size());}public static List<StudentInfo> readStudentInfo(String fileName) {List<StudentInfo> list = new ArrayList<StudentInfo>();try {BufferedReader br = new BufferedReader(new FileReader(fileName));String line = null;while ( (line = br.readLine()) != null ) {String[] infos = line.split(",");list.add(new StudentInfo(infos[0], infos[1], infos[2]));}br.close();} catch (Exception e) {e.printStackTrace();}return list;}}

二、BufferedWriter。BufferedWrite比普通的字符流会多一个插入分行符的方法：newLine()写入一个行分隔符。下面读取test.txt中的数据并封装为StudengInfo:

package io.buffer;import java.io.*;import java.util.*;public class StudentInfoReader1 {public static void main(String[] args) {String fileName = "F:" + File.separator + "test.txt";StudentInfo student=new StudentInfo("Lily","100003","java");addStudentInfo(fileName,student);List<StudentInfo> stuls =readStudentInfo(fileName);System.out.println(stuls.size());}public static List<StudentInfo> readStudentInfo(String fileName) {List<StudentInfo> list = new ArrayList<StudentInfo>();try {BufferedReader br = new BufferedReader(new FileReader(fileName));String line = null;while ( (line = br.readLine()) != null ) {String[] infos = line.split(",");list.add(new StudentInfo(infos[0], infos[1], infos[2]));}br.close();} catch (IOException e) {e.printStackTrace();}return list;}public static void addStudentInfo(String fileName,StudentInfo student) {try {BufferedWriter bw = new BufferedWriter(new FileWriter(fileName,true));bw.write("\r\n");//相当于bw.newLine();bw.write(student.toString());bw.close();} catch (IOException e) {e.printStackTrace();}}}