JAVA文件操作类，方便读写小文件

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-->package cn.edu.dlut.wisdom;

import java.io.*;
import java.util.*;

public class FileAccess {
    public static String readAllText(String fileName) throws IOException {
        StringBuffer sb = new StringBuffer();
        char[] buf = new char[1024];
        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(fileName)));
        while(br.read(buf) != -1) {
            sb.append(buf);
        }
        return sb.toString();
    }

    public static String readAllText(String fileName, String encode) throws IOException {
        StringBuffer sb = new StringBuffer();
        char[] buf = new char[1024];
        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(fileName), encode));
        while(br.read(buf) != 0) {
            sb.append(buf);
        }
        return sb.toString();
    }

    public static String[] readAllLines(String fileName) throws IOException {
        ArrayList<String> lines = new ArrayList<String>();
        String s;
        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(fileName)));
        while ((s = br.readLine()) != null)
            lines.add(s);
        br.close();
        return lines.toArray(new String[]{});
    }

    public static String[] readAllLines(String fileName, String encode) throws IOException {
        ArrayList<String> lines = new ArrayList<String>();
        String s;
        BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(fileName), encode));
        while ((s = br.readLine()) != null)
            lines.add(s);
        br.close();
        return lines.toArray(new String[]{});
    }

    public static void writeAllText(String fileName, String text) throws FileNotFoundException {
        PrintWriter pw = new PrintWriter(new FileOutputStream(fileName));
        pw.print(text);
        pw.flush();
        pw.close();
    }

    public static void writeAllText(String fileName, String encode, String text) throws FileNotFoundException, UnsupportedEncodingException {
        PrintWriter pw = new PrintWriter(new OutputStreamWriter(new FileOutputStream(fileName), encode));
        pw.print(text);
        pw.flush();
        pw.close();
    }

    public static void writeAllLines(String fileName, String[] lines) throws FileNotFoundException {
        PrintWriter pw = new PrintWriter(new FileOutputStream(fileName));
        for(String s : lines)
            pw.println(s);
        pw.flush();
        pw.close();
    }

    public static void writeAllLines(String fileName, String encode, String[] lines) throws FileNotFoundException, UnsupportedEncodingException {
        PrintWriter pw = new PrintWriter(new OutputStreamWriter(new FileOutputStream(fileName), encode));
        for(String s : lines)
            pw.println(s);
        pw.flush();
        pw.close();
    }

    public static void writeObject(String fileName, Serializable ob) throws IOException {
        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(fileName));
        oos.writeObject(ob);
        oos.flush();
        oos.close();
    }

    public static Object readObject(String fileName) throws IOException, ClassNotFoundException {
        ObjectInputStream ois = new ObjectInputStream(new FileInputStream(fileName));
        Object ob = ois.readObject();
        ois.close();
        return ob;
    }
}