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Android笔记：利用InputStream和BufferedReader 进行字节流 字符流处理

2024-07-02 22:45:01   228人阅读

 

通过socket获取字节流处理时最初使用的是BufferedReader和PrintWriter  这种方式在解析字符串时是比较方便的 但是在处理字节时不够方便最终还是回归到InputStream和OutputStream方式 不使用缓存直接使用字节流操作，一次传输的字节数据在300字节以内，目前没有测试差距会有多大。

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Arrays;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.Handler;
import android.os.Message;
import android.util.Log;

public class SocThread extends Thread {
    private String ip = "10.0.0.113";
    private int port = 6666;
    private String TAG = "socket thread";
    private int timeout = 10000;
    int maxsize = 256;

    public Socket client = null;
    PrintWriter out;
    BufferedReader in;
    public boolean isRun = true;
    Handler inHandler;
    Handler outHandler;
    Context ctx;
    private String TAG1 = "===Send===";
    SharedPreferences sp;

    public SocThread(Handler handlerin, Handler handlerout, Context context) {
        inHandler = handlerin;
        outHandler = handlerout;
        ctx = context;
        MyLog.i(TAG, "创建线程socket");
    }

    /**
     * 连接socket服务器
     */
    public void conn() {

        try {
            initdate();
            Log.i(TAG, "连接中……");
            client = new Socket(ip, port);
            client.setSoTimeout(timeout);// 设置阻塞时间
            MyLog.i(TAG, "连接成功");
            in = new BufferedReader(new InputStreamReader(
                    client.getInputStream()));
            out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
                    client.getOutputStream())), true);
            MyLog.i(TAG, "输入输出流获取成功");
        } catch (UnknownHostException e) {
            MyLog.i(TAG, "连接错误UnknownHostException 重新获取");
            e.printStackTrace();
            conn();
        } catch (IOException e) {
            MyLog.i(TAG, "连接服务器io错误");
            e.printStackTrace();
        } catch (Exception e) {
            MyLog.i(TAG, "连接服务器错误Exception" + e.getMessage());
            e.printStackTrace();
        }
    }

    public void initdate() {
        sp = ctx.getSharedPreferences("SP", ctx.MODE_PRIVATE);
        ip = sp.getString("ipstr", ip);
        port = Integer.parseInt(sp.getString("port", String.valueOf(port)));
        MyLog.i(TAG, "获取到ip端口:" + ip + ";" + port);
    }

    /**
     * 实时接受数据
     */
    @Override
    public void run() {
        MyLog.i(TAG, "线程socket开始运行");
        conn();
        MyLog.i(TAG, "1.run开始");
        String line = "";
        while (isRun) {
            try {
                if (client != null) {
                    MyLog.i(TAG, "2.检测数据");  
                    // 以下是按行直接读取字符流
                     while ((line = in.readLine()) != null) {
                     MyLog.i(TAG,
                     "3.getdata" + line + " len=" + line.length());
                     MyLog.i(TAG, "4.start set Message");
                     Message msg = inHandler.obtainMessage();
                     msg.obj = line;
                     inHandler.sendMessage(msg);// 结果返回给UI处理
                     MyLog.i(TAG1, "5.send to handler");
                     }

                } else {
                    MyLog.i(TAG, "没有可用连接");
                    conn();
                }
            } catch (Exception e) {
                MyLog.i(TAG, "数据接收错误" + e.getMessage());
                e.printStackTrace();
            }
        }
    }

    /**
     * 发送数据
     * 
     * @param mess
     */
    public void Send(String mess) {
        try {
            if (client != null) {
                MyLog.i(TAG1, "发送" + mess + "至"
                        + client.getInetAddress().getHostAddress() + ":"
                        + String.valueOf(client.getPort()));
                out.println(mess);//按字符流发送
                out.flush();
                MyLog.i(TAG1, "发送成功");
                Message msg = outHandler.obtainMessage();
                msg.obj = mess;
                msg.what = 1;
                outHandler.sendMessage(msg);// 结果返回给UI处理
            } else {
                MyLog.i(TAG, "client 不存在");
                Message msg = outHandler.obtainMessage();
                msg.obj = mess;
                msg.what = 0;
                outHandler.sendMessage(msg);// 结果返回给UI处理
                MyLog.i(TAG, "连接不存在重新连接");
                conn();
            }

        } catch (Exception e) {
            MyLog.i(TAG1, "send error");
            e.printStackTrace();
        } finally {
            MyLog.i(TAG1, "发送完毕");

        }
    }

    /**
     * 关闭连接
     */
    public void close() {
        try {
            if (client != null) {
                MyLog.i(TAG, "close in");
                in.close();
                MyLog.i(TAG, "close out");
                out.close();
                MyLog.i(TAG, "close client");
                client.close();
            }
        } catch (Exception e) {
            MyLog.i(TAG, "close err");
            e.printStackTrace();
        }

    }
}

原始字节流读取处理如下

package com.example.testsocket;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.Handler;
import android.os.Message;
import android.util.Log;

public class SocThread extends Thread {
    private String ip = "10.0.0.113";
    private int port = 6666;
    private String TAG = "socket thread";
    private int timeout = 10000;
    private int maxsize = 256;// 默认接受大小

    public Socket client = null;
    // PrintWriter out;
    // BufferedReader in;
    OutputStream out;
    InputStream in;
    public boolean isRun = true;
    Handler inHandler;
    Handler outHandler;
    Context ctx;
    private String TAG1 = "===Send===";
    SharedPreferences sp;

    public SocThread(Handler handlerin, Handler handlerout, Context context) {
        inHandler = handlerin;
        outHandler = handlerout;
        ctx = context;
        MyLog.i(TAG, "创建线程socket");
    }

    /**
     * 连接socket服务器
     */
    public void conn() {

        try {
            initdate();
            Log.i(TAG, "连接中……");
            client = new Socket(ip, port);
            client.setSoTimeout(timeout);// 设置阻塞时间
            MyLog.i(TAG, "连接成功");
            in = client.getInputStream();
            out = client.getOutputStream();
            // 以下在字符流时比较好用
            // in = new BufferedReader(new InputStreamReader(
            // client.getInputStream()));
            // out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(
            // client.getOutputStream())), true);
            MyLog.i(TAG, "输入输出流获取成功");
        } catch (UnknownHostException e) {
            MyLog.i(TAG, "连接错误UnknownHostException 重新获取");
            e.printStackTrace();
            conn();
        } catch (IOException e) {
            MyLog.i(TAG, "连接服务器io错误");
            e.printStackTrace();
        } catch (Exception e) {
            MyLog.i(TAG, "连接服务器错误Exception" + e.getMessage());
            e.printStackTrace();
        }
    }

    public void initdate() {
        sp = ctx.getSharedPreferences("SP", ctx.MODE_PRIVATE);
        ip = sp.getString("ipstr", ip);
        port = Integer.parseInt(sp.getString("port", String.valueOf(port)));
        MyLog.i(TAG, "获取到ip端口:" + ip + ";" + port);
    }

    /**
     * 实时接受数据
     */
    @Override
    public void run() {
        MyLog.i(TAG, "线程socket开始运行");
        conn();
        MyLog.i(TAG, "1.run开始");
        String line = "";
        while (isRun) {
            try {
                if (client != null) {
                    MyLog.i(TAG, "2.检测数据");
                    byte[] temp = new byte[maxsize];// 默认最带为256
                    int size = 0;
                    while ((size = in.read(temp)) > 0) {
                        // -1表示文件结尾
                        byte[] res = new byte[size];// 默认最带为256
                        MyLog.i(TAG, "4.start set Message 字节读取");
                        System.arraycopy(temp, 0, res, 0, size);
                        for (int i = 0; i < size; i++) {
                            line += res[i] + " ";
                        }
                        MyLog.i(TAG, "3.getdata " + line + " size=" + size);
                        MyLog.i(TAG, "4.start set Message");
                        Message msg = inHandler.obtainMessage();
                        msg.obj = line;
                        inHandler.sendMessage(msg);// 结果返回给UI处理
                        MyLog.i(TAG1, "5.send to handler");
                    }
                 
                } else {
                    MyLog.i(TAG, "没有可用连接");
                    conn();
                }
            } catch (Exception e) {
                MyLog.i(TAG, "数据接收错误" + e.getMessage());
                e.printStackTrace();
            }
        }
    }

    /**
     * 发送数据
     * 
     * @param mess
     */
    public void Send(byte[] mess) {
        try {
            if (client != null) {
                MyLog.i(TAG1, "发送" + mess + "至"
                        + client.getInetAddress().getHostAddress() + ":"
                        + String.valueOf(client.getPort()));
                out.write(mess);//按字节发送
                out.flush();
                MyLog.i(TAG1, "发送成功");
                Message msg = outHandler.obtainMessage();
                msg.obj = mess;
                msg.what = 1;
                outHandler.sendMessage(msg);// 结果返回给UI处理
            } else {
                MyLog.i(TAG, "client 不存在");
                Message msg = outHandler.obtainMessage();
                msg.obj = mess;
                msg.what = 0;
                outHandler.sendMessage(msg);// 结果返回给UI处理
                MyLog.i(TAG, "连接不存在重新连接");
                conn();
            }

        } catch (Exception e) {
            MyLog.i(TAG1, "send error");
            e.printStackTrace();
        } finally {
            MyLog.i(TAG1, "发送完毕");

        }
    }

    /**
     * 关闭连接
     */
    public void close() {
        try {
            if (client != null) {
                MyLog.i(TAG, "close in");
                in.close();
                MyLog.i(TAG, "close out");
                out.close();
                MyLog.i(TAG, "close client");
                client.close();
            }
        } catch (Exception e) {
            MyLog.i(TAG, "close err");
            e.printStackTrace();
        }

    }
}

 参考：

java 从InputStream 获取字节数组


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