网络编程-TCP传输

╰半橙微兮° 2022-05-31 14:14 239阅读 0赞

## **1.客户端给服务端发送文本，服务端会将文本转成大写在返回给客户端** ##

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.服务端读取图片并发送给客户端，客户端保存图片到本地 ##

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();
    			}
    			
    			
    		}
        	 
        	 
         }
    }