From 9527415544c1acd0fe35ac6991f356d187a2e106 Mon Sep 17 00:00:00 2001
From: mathm <tlming16@fudan.edu.cn>
Date: Fri, 28 Aug 2020 20:10:56 +0800
Subject: [PATCH] go net example

---
 go/goutil/net/client.go | 26 +++++++++++++
 go/goutil/net/readme.md | 83 +++++++++++++++++++++++++++++++++++++++++
 go/goutil/net/server.go | 43 +++++++++++++++++++++
 3 files changed, 152 insertions(+)
 create mode 100644 go/goutil/net/client.go
 create mode 100644 go/goutil/net/readme.md
 create mode 100644 go/goutil/net/server.go

diff --git a/go/goutil/net/client.go b/go/goutil/net/client.go
new file mode 100644
index 0000000..2b311e4
--- /dev/null
+++ b/go/goutil/net/client.go
@@ -0,0 +1,26 @@
+// client.go 
+package main 
+import (
+	"fmt"
+	"net"
+)
+
+func main(){
+	conn,err:=net.Dial("tcp","127.0.0.1:8000")
+	if err!=nil{
+		fmt.Println("err = ",err);
+	}
+	defer conn.Close()
+		buf:=make([]byte,1024)
+		n,e:=conn.Read(buf)
+		if e!=nil{
+			fmt.Println("read err : ",e);
+		}else {
+			fmt.Println(string(buf[:n]))
+		}
+		conn.Write([]byte("I AM CLIENT!"));
+		conn.Write([]byte("what do you want to say?"))
+		n1,_:=conn.Read(buf)
+		fmt.Println(string(buf[:n1]))
+
+}
\ No newline at end of file
diff --git a/go/goutil/net/readme.md b/go/goutil/net/readme.md
new file mode 100644
index 0000000..b2093db
--- /dev/null
+++ b/go/goutil/net/readme.md
@@ -0,0 +1,83 @@
+# go net
+
+- server.go 
+
+- client.go 
+
+  ```go
+  // server.go
+  package main 
+  import (
+  	"fmt"
+  	"net"
+  )
+  
+  func main(){
+  	// 主机 监听端口
+  	listen,err := net.Listen("tcp","127.0.0.1:8000");
+  	if err!=nil {
+  		fmt.Println("err =",err);
+  		return 
+  	}
+  	defer listen.Close()
+  	cnt:=0
+  	for {
+  		// 建立连接
+  		conn,err:=listen.Accept()
+  		if err!=nil{
+  			fmt.Println("err = ",err)
+  			return 
+  		}
+  		// 发送消息
+  		conn.Write([]byte("welcome to go net world!\n")) 
+  		buf:=make([]byte,1024) 
+  		// 接收消息
+  		n,er:=conn.Read(buf) 
+  		if er!=nil{
+  			fmt.Println("err = ",er)
+  			return 
+  		}
+  		cnt++;
+  		fmt.Printf("this is the %d th message:%s\n",cnt,string(buf[:n]));
+  		var s string
+  		conn.Read(buf);
+  		fmt.Printf(string(buf))
+  		fmt.Scanf("%s",&s);
+  		conn.Write([]byte(s));
+  		// 关闭连接
+  		defer conn.Close()
+  	}
+  }
+  ```
+
+  
+
+```go
+// client.go 
+package main 
+import (
+	"fmt"
+	"net"
+)
+
+func main(){
+	conn,err:=net.Dial("tcp","127.0.0.1:8000")
+	if err!=nil{
+		fmt.Println("err = ",err);
+	}
+	defer conn.Close()
+		buf:=make([]byte,1024)
+		n,e:=conn.Read(buf)
+		if e!=nil{
+			fmt.Println("read err : ",e);
+		}else {
+			fmt.Println(string(buf[:n]))
+		}
+		conn.Write([]byte("I AM CLIENT!"));
+		conn.Write([]byte("what do you want to say?"))
+		conn.Read(buf)
+		fmt.Println(string(buf))
+
+}
+```
+
diff --git a/go/goutil/net/server.go b/go/goutil/net/server.go
new file mode 100644
index 0000000..78ccc4f
--- /dev/null
+++ b/go/goutil/net/server.go
@@ -0,0 +1,43 @@
+// server.go
+package main 
+import (
+	"fmt"
+	"net"
+)
+
+func main(){
+	// 主机 监听端口
+	listen,err := net.Listen("tcp","127.0.0.1:8000");
+	if err!=nil {
+		fmt.Println("err =",err);
+		return 
+	}
+	defer listen.Close()
+	cnt:=0
+	for {
+		// 建立连接
+		conn,err:=listen.Accept()
+		if err!=nil{
+			fmt.Println("err = ",err)
+			return 
+		}
+		// 发送消息
+		conn.Write([]byte("welcome to go net world!\n")) 
+		buf:=make([]byte,1024) 
+		// 接收消息
+		n,er:=conn.Read(buf) 
+		if er!=nil{
+			fmt.Println("err = ",er)
+			return 
+		}
+		cnt++;
+		fmt.Printf("this is the %d th message:%s\n",cnt,string(buf[:n]));
+		var s string
+		conn.Read(buf);
+		fmt.Printf(string(buf))
+		fmt.Scanf("%s",&s);
+		conn.Write([]byte(s));
+		// 关闭连接
+		defer conn.Close()
+	}
+}
\ No newline at end of file