JAVA读写文件

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.util.Set;

import java.util.TreeMap;

public class FileReadWrite{

/**

*@param args

*@throws IOException

*/

public static void write(StringBuffer bb,String string,

TreeMapmap)throws IOException{ BufferedReader br;

FileWriter fw=new FileWriter(string,true);

try{

br=new BufferedReader(new FileReader(string));

Setset=map.keySet();

//fw.append("\\r\\n");

for(String ch:set){

fw.append(ch+

}

br.close();

}catch(FileNotFoundException e){

e.printStackTrace();

}

fw.close();

}

public static TreeMapread(File file,String encoding, StringBuffer bb){

TreeMapmap=new TreeMap();

try{

if(file.isFile()&&file.exists()){

InputStreamReader read=new InputStreamReader(

new FileInputStream(file),encoding);BufferedReader bufferedReader=new BufferedReader(read);

String lineTXT=null;

while((lineTXT=bufferedReader.readLine())!=null){

bb=new StringBuffer("");

bb.append(lineTXT.toString().trim());

String res[]=bb.toString().split("");

if(res.length==8){

String date[]=res[1].split("");

if(date.length==6){

String LocationYearMonth=res[5]+"_"+date[5]

+"_"+date[1];

if(!res[6].equals("null")){

LocationYearMonth=res[6]+"_"+date[5]

+"_"+date[1];

System.out.println(lineTXT.toString().trim());

}

if(map.get(LocationYearMonth)==null){

map.put(LocationYearMonth,1);

}else{

Integer in=map.get(LocationYearMonth);

map.put(LocationYearMonth,in.intValue()+1);

}

}

}

}

read.close();

}else{

System.out.println("找不到指定的文件！");

}

}catch(Exception e){

System.out.println("读取文件内容操作出错");

e.printStackTrace();

}

return map;

}

}