savefile.java

用JAVA实现串口GSM发信息

package com;

import java.io.*;

public class SaveFile {

	public boolean saveMsg(String[] msg) {
		boolean ok = false;
		File fo = null;
		FileOutputStream to = null;
		PrintWriter out = null;
		try {
			if (!(new File("C:\\Gsm1.0").isDirectory()))
				new File("C:\\Gsm1.0").mkdir();// 目标文件夹

			fo = new File("C:\\Gsm1.0\\Msgs.txt");
			if (!fo.exists()) // 文件不存在
				fo.createNewFile();// 创建新文件

			to = new FileOutputStream(fo, false); // 创建文件输出流
			out = new PrintWriter(to); // 输出流

			for (int i = 0; i < msg.length; i++) {
				if (msg[i] == null)
					break;
				out.println(msg[i]);
			}

			ok = true;

		} catch (FileNotFoundException e1) {
			// TODO 自动生成 catch 块
			e1.printStackTrace();
			return false;
		} catch (NullPointerException ee) {
			System.out.println(ee.toString());
			return false;
		} catch (IOException e) {
			System.out.println(e.toString());
			return false;
		} finally {
			try {
				out.close(); // 关闭流
				to.close();
			} catch (IOException e) {
				// TODO 自动生成 catch 块
				e.printStackTrace();
			}
		}

		return ok;
	}

	public String[] getMsg() {
		String[] msg = null;
		int i = 0;
		FileReader fi = null;
		BufferedReader ins = null;
		try {
			fi = new FileReader("C:\\Gsm1.0\\Msgs.txt");
			ins = new BufferedReader(fi);
		
			ins.mark(1024);// 标记流,以便重新读

			while (true) { // 分行打印文件数据
				if (ins.readLine() == null)
					break;
				i++;// 记录的数量
			}

			msg = new String[i + 50];
			i = 0;

			ins.reset();// 重置流,重读并保存到数组

			for (i = 0; i < msg.length; i++) {
				if ((msg[i] = ins.readLine()) == null)
					break;
			}

		} catch (FileNotFoundException e1) {
			// TODO 自动生成 catch 块
			System.out.println("记录文件未找到!") ;
			return new String[50];
		} catch (NullPointerException e) {
			e.printStackTrace();
			System.out.println("读取文件出错!");
		} catch (IOException e) {
			e.printStackTrace();
			System.out.println("读取文件出错!" );
		} finally {
			try {
				fi.close();
				ins.close();
			} catch (IOException e) {
				// TODO 自动生成 catch 块
				e.printStackTrace();
				System.out.println("读取文件出错!");
			}
		}
		return msg;
	}

	public boolean saveFriend(String[] msg) {
		boolean ok = false;
		File fo = null;
		FileOutputStream to = null;
		PrintWriter out = null;
		try {
			if (!(new File("C:\\Gsm1.0").isDirectory()))
				new File("C:\\Gsm1.0").mkdir();// 目标文件夹

			fo = new File("C:\\Gsm1.0\\Friends.txt");
			if (!fo.exists()) // 文件不存在
				fo.createNewFile();// 创建新文件

			to = new FileOutputStream(fo, false); // 创建文件输出流
			out = new PrintWriter(to); // 输出流

			for (int i = 0; i < msg.length; i++) {
				if (msg[i] == null)
					break;
				out.println(msg[i]);
			}

			ok = true;

		} catch (FileNotFoundException e1) {
			// TODO 自动生成 catch 块
			e1.printStackTrace();
			return false;
		} catch (NullPointerException ee) {
			System.out.println(ee.toString());
			return false;
		} catch (IOException e) {
			System.out.println(e.toString());
			return false;
		} finally {
			try {
				out.close(); // 关闭流
				to.close();				
			} catch (IOException e) {
				// TODO 自动生成 catch 块
				e.printStackTrace();
				return false;
			}
		}

		return ok;
	}

	public String[] getFriend() {
		String[] Friend = null;
		int i = 0;
		FileReader fi = null;
		BufferedReader ins = null;
		try {
			fi = new FileReader("C:\\Gsm1.0\\Friends.txt");
			ins = new BufferedReader(fi);
		
			ins.mark(1024);// 标记流,以便重新读

			while (true) { // 分行打印文件数据1111111111111111111111111111111111111111111111111111
				if (ins.readLine() == null)
					break;
				i++;// 记录的数量
			}

			Friend = new String[i+50];
			i = 0;

			ins.reset();// 重置流,重读并保存到数组

			for (i = 0; i < Friend.length; i++) {
				if ((Friend[i] = ins.readLine()) == null)
					break;
			}

		} catch (FileNotFoundException e1) {
			// TODO 自动生成 catch 块
			System.out.println("记录文件未找到!") ;
			return new String[50];
		} catch (NullPointerException e) {
			e.printStackTrace();
			System.out.println( "读取文件出错!" );
		} catch (IOException e) {
			e.printStackTrace();
			System.out.println("读取文件出错!" );
		} finally {
			try {
				fi.close();
				ins.close();
			} catch (IOException e) {
				// TODO 自动生成 catch 块
				e.printStackTrace();
				System.out.println( "读取文件出错!" );
			}
		}
		return Friend;
	}

	public static void main(String[] args) {
		SaveFile test = new SaveFile();
		String[] str = { "潘", "建", "军" };
		String[] get = null;
		// test.saveMsg(str);
		// get=test.getMsg();
		test.saveFriend(str);
		get = test.getFriend();

		for (int i = 0; i < get.length; i++) {
			if (get[i] == null)
				break;
			System.out.println(get[i]);
		}
	}

}