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本文链接:https://blog.csdn.net/weixin_42528266/article/details/103366476
服务端实现:
public class FileUpload_Server {
public static void main(String[] args) throws IOException {
System.out.println("服务器 启动..... ");
// 1. 创建服务端ServerSocket
ServerSocket serverSocket = new ServerSocket(6666);
// 2. 建立连接
Socket accept = serverSocket.accept();
// 3. 创建流对象
// 3.1 获取输入流,读取文件数据
BufferedInputStream bis = new BufferedInputStream(accept.getInputStream());
// 3.2 创建输出流,保存到本地 .
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("copy.jpg"));
// 4. 读写数据
byte[] b = new byte[1024 * 8];
int len;
while ((len = bis.read(b)) != -1) {
bos.write(b, 0, len);
}
//5. 关闭 资源
bos.close();
bis.close();
accept.close();
System.out.println("文件上传已保存");
}
}
客户端实现:
public class FileUPload_Client {
public static void main(String[] args) throws IOException {
// 1.创建流对象
// 1.1 创建输入流,读取本地文件
BufferedInputStream bis = new BufferedInputStream(new FileInputStream("test.jpg"));
// 1.2 创建输出流,写到服务端
Socket socket = new Socket("localhost", 6666);
BufferedOutputStream bos = new BufferedOutputStream(socket.getOutputStream());
//2.写出数据.
byte[] b = new byte[1024 * 8 ];
int len ;
while (( len = bis.read(b))!=-1) {
bos.write(b, 0, len);
bos.flush();
}
System.out.println("文件发送完毕");
// 3.释放资源
bos.close();
socket.close();
bis.close();
System.out.println("文件上传完毕 ");
}
}
FileOutputStream fis = new FileOutputStream(System.currentTimeMillis()+".jpg") // 文件名称
BufferedOutputStream bos = new BufferedOutputStream(fis);
// 每次接收新的连接,创建一个Socket
while(true){
Socket accept = serverSocket.accept();
......
}
while(true){
Socket accept = serverSocket.accept();
// accept 交给子线程处理.
new Thread(() -> {
......
InputStream bis = accept.getInputStream();
......
}).start();
}
public class FileUpload_Server {
public static void main(String[] args) throws IOException {
System.out.println("服务器 启动..... ");
// 1. 创建服务端ServerSocket
ServerSocket serverSocket = new ServerSocket(6666);
// 2. 循环接收,建立连接
while (true) {
Socket accept = serverSocket.accept();
/*
3. socket对象交给子线程处理,进行读写操作
Runnable接口中,只有一个run方法,使用lambda表达式简化格式
*/
new Thread(() -> {
try (
//3.1 获取输入流对象
BufferedInputStream bis = new BufferedInputStream(accept.getInputStream());
//3.2 创建输出流对象, 保存到本地 .
FileOutputStream fis = new FileOutputStream(System.currentTimeMillis() + ".jpg");
BufferedOutputStream bos = new BufferedOutputStream(fis);) {
// 3.3 读写数据
byte[] b = new byte[1024 * 8];
int len;
while ((len = bis.read(b)) != -1) {
bos.write(b, 0, len);
}
//4. 关闭 资源
bos.close();
bis.close();
accept.close();
System.out.println("文件上传已保存");
} catch (IOException e) {
e.printStackTrace();
}
}).start();
}
}
}
前四步与基本文件上传一致.
public class FileUpload_Server {
public static void main(String[] args) throws IOException {
System.out.println("服务器 启动..... ");
// 1. 创建服务端ServerSocket
ServerSocket serverSocket = new ServerSocket(6666);
// 2. 循环接收,建立连接
while (true) {
Socket accept = serverSocket.accept();
/*
3. socket对象交给子线程处理,进行读写操作
Runnable接口中,只有一个run方法,使用lambda表达式简化格式
*/
new Thread(() -> {
try (
//3.1 获取输入流对象
BufferedInputStream bis = new BufferedInputStream(accept.getInputStream());
//3.2 创建输出流对象, 保存到本地 .
FileOutputStream fis = new FileOutputStream(System.currentTimeMillis() + ".jpg");
BufferedOutputStream bos = new BufferedOutputStream(fis);
) {
// 3.3 读写数据
byte[] b = new byte[1024 * 8];
int len;
while ((len = bis.read(b)) != -1) {
bos.write(b, 0, len);
}
// 4.=======信息回写===========================
System.out.println("back ........");
OutputStream out = accept.getOutputStream();
out.write("上传成功".getBytes());
out.close();
//================================
//5. 关闭 资源
bos.close();
bis.close();
accept.close();
System.out.println("文件上传已保存");
} catch (IOException e) {
e.printStackTrace();
}
}).start();
}
}
}
客户端实现:
public class FileUpload_Client {
public static void main(String[] args) throws IOException {
// 1.创建流对象
// 1.1 创建输入流,读取本地文件
BufferedInputStream bis = new BufferedInputStream(new FileInputStream("test.jpg"));
// 1.2 创建输出流,写到服务端
Socket socket = new Socket("localhost", 6666);
BufferedOutputStream bos = new BufferedOutputStream(socket.getOutputStream());
//2.写出数据.
byte[] b = new byte[1024 * 8 ];
int len ;
while (( len = bis.read(b))!=-1) {
bos.write(b, 0, len);
}
// 关闭输出流,通知服务端,写出数据完毕
socket.shutdownOutput();
System.out.println("文件发送完毕");
// 3. =====解析回写============
InputStream in = socket.getInputStream();
byte[] back = new byte[20];
in.read(back);
System.out.println(new String(back));
in.close();
// ============================
// 4.释放资源
socket.close();
bis.close();
}
}
模拟网站服务器,使用浏览器访问自己编写的服务端程序,查看网页效果。
public static void main(String[] args) throws IOException {
ServerSocket server = new ServerSocket(8000);
Socket socket = server.accept();
InputStream in = socket.getInputStream();
byte[] bytes = new byte[1024];
int len = in.read(bytes);
System.out.println(new String(bytes,0,len));
socket.close();
server.close();
}
GET/web/index.html HTTP/1.1是浏览器的请求消息。/web/index.html为浏览器想要请求的服务器端的资源,使用字符串切割方式获取到请求的资源。
//转换流,读取浏览器请求第一行
BufferedReader readWb = new BufferedReader(new InputStreamReader(socket.getInputStream()));
String requst = readWb.readLine();
//取出请求资源的路径
String[] strArr = requst.split(" ");
//去掉web前面的/
String path = strArr[1].substring(1);
System.out.println(path);
服务端实现:
public class SerDemo {
public static void main(String[] args) throws IOException {
System.out.println("服务端 启动 , 等待连接 .... ");
// 创建ServerSocket 对象
ServerSocket server = new ServerSocket(8888);
Socket socket = server.accept();
// 转换流读取浏览器的请求消息
BufferedReader readWb = new
BufferedReader(new InputStreamReader(socket.getInputStream()));
String requst = readWb.readLine();
// 取出请求资源的路径
String[] strArr = requst.split(" ");
// 去掉web前面的/
String path = strArr[1].substring(1);
// 读取客户端请求的资源文件
FileInputStream fis = new FileInputStream(path);
byte[] bytes= new byte[1024];
int len = 0 ;
// 字节输出流,将文件写会客户端
OutputStream out = socket.getOutputStream();
// 写入HTTP协议响应头,固定写法
out.write("HTTP/1.1 200 OK\r\n".getBytes());
out.write("Content-Type:text/html\r\n".getBytes());
// 必须要写入空行,否则浏览器不解析
out.write("\r\n".getBytes());
while((len = fis.read(bytes))!=-1){
out.write(bytes,0,len);
}
fis.close();
out.close();
readWb.close();
socket.close();
server.close();
}
}
小贴士:不同的浏览器,内核不一样,解析效果有可能不一样。
发现浏览器中出现很多的叉子,说明浏览器没有读取到图片信息导致。
浏览器工作原理是遇到图片会开启一个线程进行单独的访问,因此在服务器端加入线程技术。
public class ServerDemo {
public static void main(String[] args) throws IOException {
ServerSocket server = new ServerSocket(8888);
while(true){
Socket socket = server.accept();
new Thread(new Web(socket)).start();
}
}
static class Web implements Runnable{
private Socket socket;
public Web(Socket socket){
this.socket=socket;
}
public void run() {
try{
//转换流,读取浏览器请求第一行
BufferedReader readWb = new
BufferedReader(new InputStreamReader(socket.getInputStream()));
String requst = readWb.readLine();
//取出请求资源的路径
String[] strArr = requst.split(" ");
System.out.println(Arrays.toString(strArr));
String path = strArr[1].substring(1);
System.out.println(path);
FileInputStream fis = new FileInputStream(path);
System.out.println(fis);
byte[] bytes= new byte[1024];
int len = 0 ;
//向浏览器 回写数据
OutputStream out = socket.getOutputStream();
out.write("HTTP/1.1 200 OK\r\n".getBytes());
out.write("Content-Type:text/html\r\n".getBytes());
out.write("\r\n".getBytes());
while((len = fis.read(bytes))!=-1){
out.write(bytes,0,len);
}
fis.close();
out.close();
readWb.close();
socket.close();
}catch(Exception ex){
}
}
}
}
访问效果: