我有一个服务器为客户端返回文件 photo.png ，当我引入此链接时，服务器正在运行，将客户端视为浏览器localhost:5555/photo.png我没有得到图片我明白了：
\89PNG
\00\00\00
IHDR\00\00\00\00\00\00\00\91\F9\00\00\00gAMA\00\00\B1\8F\FCa\00\00\00sRGB\00\AE\CE\E9\00\00\00PLTELiq\EA\F2\F7\F2\F4\F8\FB\EF\EF\E9\F1\F7\EA\F2\F8\EC\F3\F8\FC\EC\EB\FB\ED\EE\E4\EF\F7\FB\EC\EC\FB\ED\ED\FB\ED\ED\ED\F4\F9\FB\EF\EF\FD\ED\ED\EB\EB\EB\FB\EB\EB\F9\EE\EF\FA\EB\EB\EE\F4\F8\F2\F2\F2\FB\E9\E9\E9\F1\F8\EA\F1\F8\EC\F3\F8\FB\E9\EA\E6\F0\F6\E7\F1\F7\FC\EF\EF\EA\F1\F6\EF\EF\EF\ED\F3\F7\ED\F3\F8\E7\F0\F7\FA\EE\EE\FA\E9\E9\EA\F0\F8\ED\F2\F9\EA\F3\F9\F3\F2\F4\FC\EC\EB\E1"o\B6\E0"\E1!\E0!\E1! n\B5\E0 \E0k\B4\00f\B2n\B6\E0m\B5 n\B6\00g\B2\E0\E0\DFj\B3\00a\AF\DF\00e\B1l\B4\00i\B3\DF\E0!l\B5\00h\B2\DF\00`\AE m\B5\E0\E1"\DF\DF\00c\B0\E47:\DF
\E2'*\E0\E5:<\DE \DE\DF\00d\B0\00_\AE\F2\9D\9F\DE
y\BB\DF ........
这是image photo.png背后的代码或文字，但应显示的是： photo.ong
当我需要PDF文件时，我会得到代码而不是文件......
import java.io.*;
import java.net.*;
public class Server {
public static void main (String[] args){
Socket socket;
ServerSocket serverSocket;
BufferedReader in = null;
PrintWriter out = null;
BufferedInputStream bis;
BufferedOutputStream bos;
try{
serverSocket=new ServerSocket(5555);
socket = serverSocket.accept();
out = new PrintWriter(socket.getOutputStream(), true);
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String input, output;
input = in.readLine(); //(1)
out.println("Server: Connected. Input from Client:"+input); //(2)
input = in.readLine(); //(1)
out.println("Server: I am ready to recieve file. Input from Client:"+input); //(2)
bis = new BufferedInputStream(socket.getInputStream());
bos = new BufferedOutputStream(new FileOutputStream("photo.png"));
int length = Integer.parseInt(input);
int i=0;
int IN=0;
byte[] receivedData = new byte[1000];
while ((IN = bis.read(receivedData)) != length){ //in = int; receivedData = byte[]
bos.write(receivedData,0,IN);
}
}
catch(IOException e){
e.printStackTrace();
}
}
}