File f = new File("F:/head.jpg");
try {
String str_attachmemt = "";
FileInputStream in = new FileInputStream(f);
System.out.println("可读大小:" + in.available()); byte[] b = new byte[in.available()];
int len = in.read(b, 0, b.length);
str_attachmemt += new String(b, 0, len, "GB2312");
System.out.println(str_attachmemt + "\n" + str_attachmemt.getBytes("GB2312").length); } catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
打印如下:
可读大小:27569
20564
以上是一个测试socket那边传过来的数据为:size:27569
图片字节信息
........
........ 那边的数据是一段一段分包过来的
我如何根据这个size正确接收到图片
try {
String str_attachmemt = "";
FileInputStream in = new FileInputStream(f);
System.out.println("可读大小:" + in.available()); byte[] b = new byte[in.available()];
int len = in.read(b, 0, b.length);
str_attachmemt += new String(b, 0, len, "GB2312");
System.out.println(str_attachmemt + "\n" + str_attachmemt.getBytes("GB2312").length); } catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
打印如下:
可读大小:27569
20564
以上是一个测试socket那边传过来的数据为:size:27569
图片字节信息
........
........ 那边的数据是一段一段分包过来的
我如何根据这个size正确接收到图片
http://yijianfengvip.blog.163.com/blog/static/1752734322012113112733610/ClientTcpSend.java 客户端发送类package com.yjf.test;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.net.InetSocketAddress;
import java.net.Socket;public class ClientTcpSend {
public static String clientip = "127.0.0.1";
public static int port = 33456; public static void main(String[] args) {
int length = 0;
byte[] sendBytes = null;
Socket socket = null;
DataOutputStream dos = null;
FileInputStream fis = null;
try {
try {
socket = new Socket();
socket.connect(new InetSocketAddress(clientip, port),30 * 1000);
dos = new DataOutputStream(socket.getOutputStream());
File file = new File("F:\\aa.xml");
fis = new FileInputStream(file);
sendBytes = new byte[1024*4];
while ((length = fis.read(sendBytes, 0, sendBytes.length)) > 0) {
dos.write(sendBytes, 0, length);
dos.flush();
}
} finally {
if (dos != null)
dos.close();
if (fis != null)
fis.close();
if (socket != null)
socket.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
ServerTcpListener.java 服务器监听类package com.yjf.test;
import java.net.*;
import java.io.*;public class ServerTcpListener implements Runnable { public static void main(String[] args) { try {
final ServerSocket server = new ServerSocket(ClientTcpSend.port);
Thread th = new Thread(new Runnable() {
public void run() {
while (true) {
try {
System.out.println("开始监听...");
Socket socket = server.accept();
System.out.println("有链接");
receiveFile(socket);
} catch (Exception e) {
}
}
} }); th.run(); //启动线程运行
} catch (Exception e) {
e.printStackTrace();
}
} public void run() {
} public static void receiveFile(Socket socket) { byte[] inputByte = null;
int length = 0;
DataInputStream dis = null;
FileOutputStream fos = null;
try {
try { dis = new DataInputStream(socket.getInputStream());
fos = new FileOutputStream(new File("E:\\aa.xml"));
inputByte = new byte[1024*4];
System.out.println("开始接收数据...");
while ((length = dis.read(inputByte, 0, inputByte.length)) > 0) {
fos.write(inputByte, 0, length);
fos.flush();
}
System.out.println("完成接收");
} finally {
if (fos != null)
fos.close();
if (dis != null)
dis.close();
if (socket != null)
socket.close();
}
} catch (Exception e) { } }
}java socket通信-传输文件图片--传输图片java socket通信-传输文件图片--传输图片
主要是返回给我的是:
size:27569
图片字节信息
........
........上面多个字符串size:27569
就能接收了...
由于F:/head.jpg并不是gb2312的格式,所以你读取
str_attachmemt += new String(b, 0, len, "GB2312");为乱码
在乱码的基础上使用
str_attachmemt.getBytes("GB2312").length会丢失信息
改为iso-8859-1就不会有丢失的情况了try {
String str_attachmemt = "";
FileInputStream in = new FileInputStream(f);
System.out.println("可读大小:" + in.available());
byte[] b = new byte[in.available()];
int len = in.read(b, 0, b.length);
str_attachmemt += new String(b, 0, len, "iso-8859-1");
System.out.println(str_attachmemt + "\n"
+ str_attachmemt.getBytes("iso-8859-1").length);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
size:27569通常使用固定的字节数,比如是5个字节
byte[] size=new byte[5];
先读取大小信息
byte[] bs=new byte[byteToInt(size)];
接下来读取文件字节就可以了