读写文件权限怎么开 JAVA文件操作类，方便读写小文件

JAVA文件操作类，方便读写小文件  

　　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[ ];

　　BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(fileName)));

　　while(br read(buf) != ) {

　　sb append(buf);

　　}

　　return sb toString();

　　}

　　public static String readAllText(String fileName String encode) throws IOException {

　　StringBuffer sb = new StringBuffer();

　　char[] buf = new char[ ];

　　BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(fileName) encode));

　　while(br read(buf) != ) {

　　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;

　　}