1. The client sends text to the server, and the server will convert the text to uppercase and return it to the client
public class Testtwo {
@Test
public void bTest(){//客户端
Socket socket=null;
OutputStream os=null;
FileInputStream fis=null;
//发送服务端数据
try {
socket=new Socket(InetAddress.getByName("127.0.0.1"), 8989);//创建连接地址为127.0.0.1，端口为8989
os=socket.getOutputStream();//获取到输出对象
fis=new FileInputStream(new File("2.txt"));//取到文件
int len;
byte [] b=new byte[1024];
while((len=fis.read(b))!=-1){//对文件进行读取
os.write(b, 0, len);//将数据发送到服务器
String ssString=new String(b, 0, len);
System.out.print(ssString);
}
socket.shutdownOutput();//向系统说明数据发送完毕
//接收服务端数据
InputStream is=socket.getInputStream();//获取到服务器发的数据对象
int len1;
byte [] b1=new byte[1024];
while((len1=is.read(b1))!=-1){
String ssString=new String(b1, 0, len1);//类型转化
System.out.print(ssString);
}
} catch (Exception e) {
// TODO: handle exception
}
finally {
try {
os.close();
fis.close();
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Test
public void sTest(){
ServerSocket ss=null;
Socket socket=null;
InputStream is=null;
OutputStream os=null;
try {
ss=new ServerSocket(8989);//绑定服务器端口
socket=ss.accept();//阻塞，直到接收到客户端的Socket连接
is=socket.getInputStream();//获取到输入流对象
os=socket.getOutputStream();//获取到输出流对象
int len;
byte [] bs=new byte[1024];
while((len=is.read(bs))!=-1){//对输入流进行数据读取和处理
String ssString=new String(bs,0,len);
System.out.println(ssString);
char []cstr=ssString.toCharArray();
for(int i=0;i<cstr.length;i++){
if(cstr[i]>='a'&&cstr[i]<='z'){
cstr[i]=(char) ((int)cstr[i]-32);
}
}
System.out.println(String.valueOf(cstr));
os.write(String.valueOf(cstr).getBytes());//发送到客户端
}
//socket.shutdownInput();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally{
try {
os.close();
is.close();
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
2. The server reads the picture and sends it to the client, and the client saves the picture locally
public class Testone {
@Test
public void cTest(){
Socket socket=null;
InputStream is=null;
FileOutputStream fos=null;
try {
socket=new Socket(InetAddress.getByName("127.0.0.1"), 8989);
is=socket.getInputStream();
fos=new FileOutputStream(new File("1.jpg"));
int len;
byte [] b=new byte[1024];
while((len=is.read(b))!=-1){
fos.write(b, 0, len);
}
System.out.println("成功保存文件");
} catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
try {
fos.close();
is.close();
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
@Test
public void serverTest() {
ServerSocket ss=null;
Socket socket=null;
OutputStream os=null;
FileInputStream fis=null;
try {
ss = new ServerSocket(8989);
socket=ss.accept();
os=socket.getOutputStream();
fis=new FileInputStream(new File("2.jpg"));
int len;
byte [] b=new byte[1024];
while((len=fis.read(b))!=-1){
os.write(b,0,len);
}
socket.shutdownInput();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
try {
fis.close();
os.close();
socket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}