题目

想要服务器不停止，能接收很多客户上传的图片？

解决方案

可以使用循环或者多线程
但是循环不合理，最优解法是（循环+多线程）改写

代码实战

客户端代码

package comion">.heimaion">;

import javaion">.ioion">.*ion">;
import javaion">.netion">.Socketion">;

public class Client ion">{
    public static void ion">mainion">(Stringion">[ion">] argsion">) throws IOException ion">{
        Socket socket = new Socketion">("127.0.0.1"ion">,10000ion">)ion">;

        //读取本地文件中的数据，并写到服务器中
        BufferedInputStream bis = new BufferedInputStreamion">(new FileInputStreamion">("G:\\wjkwk\\clientdir\\123.jpg"ion">)ion">)ion">;
        BufferedOutputStream bos = new BufferedOutputStreamion">(socketion">.ion">getOutputStreamion">(ion">)ion">)ion">;
        byteion">[ion">] bytes = new byteion">[1024ion">]ion">;
        int lenion">;
        while ion">(ion">(len = bision">.ion">readion">(bytesion">)ion">) != -1ion">)ion">{
            bosion">.ion">writeion">(bytesion">,0ion">,lenion">)ion">;
        ion">}

        //往服务器写结束标记
        socketion">.ion">shutdownOutpution">(ion">)ion">;

        //接收服务器返回的数据
        BufferedReader br = new BufferedReaderion">(new InputStreamReaderion">(socketion">.ion">getInputStreamion">(ion">)ion">)ion">)ion">;
        String line = brion">.ion">readLineion">(ion">)ion">;
        Systemion">.oution">.ion">printlnion">(lineion">)ion">;
        socketion">.ion">closeion">(ion">)ion">;
    ion">}
ion">}

服务端代码

package comion">.heimaion">;

import javaion">.ioion">.*ion">;
import javaion">.netion">.ServerSocketion">;
import javaion">.netion">.Socketion">;

public class Server ion">{

    public static void ion">mainion">(Stringion">[ion">] argsion">) throws IOException ion">{

        ServerSocket serverSocket = new ServerSocketion">(10000ion">)ion">;

        while ion">(trueion">)ion">{
            //等待客户端来连接
            Socket socket = serverSocketion">.ion">acception">(ion">)ion">;
            //开启一个线程
            //一个用户就对应服务端的一条线程
            new Threadion">(new MyRunnableion">(socketion">)ion">)ion">.ion">startion">(ion">)ion">;
        ion">}
    ion">}
ion">}

package comion">.heimaion">;

import javaion">.ioion">.*ion">;
import javaion">.netion">.Socketion">;
import javaion">.utilion">.UUIDion">;

public class MyRunnable implements Runnable ion">{

    Socket socketion">;
    public MyRunnableion">(Socket socketion">)ion">{
        thision">.socket = socketion">;
    ion">}
    ion punctuation">@Override
    public void ion">runion">(ion">) ion">{

        try ion">{
            //读取客户端上传的文件并保存到本地
            BufferedInputStream bis = new BufferedInputStreamion">(socketion">.ion">getInputStreamion">(ion">)ion">)ion">;
            String name = UUIDion">.ion">randomUUIDion">(ion">)ion">.ion">toStringion">(ion">)ion">.ion">replaceion">("-"ion">, ""ion">)ion">;
            BufferedOutputStream bos = new BufferedOutputStreamion">(new FileOutputStreamion">("G:\\wjkwk\\serverdir\\"+name+".jpg"ion">)ion">)ion">;
            int lenion">;
            byteion">[ion">] bytes = new byteion">[1024ion">]ion">;
            while ion">(ion">(len = bision">.ion">readion">(bytesion">)ion">) != -1ion">)ion">{
                bosion">.ion">writeion">(bytesion">,0ion">,lenion">)ion">;
            ion">}
            //回写数据
            BufferedWriter bw = new BufferedWriterion">(new OutputStreamWriterion">(socketion">.ion">getOutputStreamion">(ion">)ion">)ion">)ion">;
            bwion">.ion">writeion">("上传成功"ion">)ion">;
            bwion">.ion">newLineion">(ion">)ion">;
            bwion">.ion">flushion">(ion">)ion">;

        ion">} catch ion">(IOException eion">) ion">{
            eion">.ion">printStackTraceion">(ion">)ion">;
        ion">} finally ion">{
            //释放资源
            try ion">{
                socketion">.ion">closeion">(ion">)ion">;
            ion">} catch ion">(IOException eion">) ion">{
                eion">.ion">printStackTraceion">(ion">)ion">;
            ion">}
        ion">}
    ion">}
ion">}

运行结果