javaSocket与C通信

前段时间写了个web端与C服务端之间的通信不过用的是短连接 非堵塞的方式，一直想使用长连接，使tomcat启动的时候就和C服务端进行通信，但是一直没找到方法希望je的朋友能给点思路。先来看我现在的具体实现 

通信的核心类


public

class

newsSockBase    


{   


    
private

SocketChannel sc;     


    
private

final

int

MAX_LENGTH =

;     


    
private

ByteBuffer r_buff ;     


    
private

ByteBuffer w_buff ;     


    
private

static

String host ;     


    
private

static

int

port;     


  


    
int

sendBufTotalLen;   


    
int

sendBufLen;   


    
int

sendBufStart;   


    
byte

[]  sendBuf;   


       


    
int

recvBufTotalLen;   


    
int

recvBufLen;   


    
int

recvBufStart;   


    
byte

[]  recvBuf;   


       


    
int

timeout;   


    String  msg;   


       


    
public

newsSockBase()   


    {   


        r_buff = ByteBuffer.allocate(MAX_LENGTH);     


        w_buff = ByteBuffer.allocate(MAX_LENGTH);    


           


        sendBufTotalLen = MAX_LENGTH;   


        sendBufLen = sendBufStart =

;   


        sendBuf = 
new

byte

[MAX_LENGTH];   


           


        recvBufTotalLen = MAX_LENGTH;   


        recvBufLen = recvBufStart =

;   


        recvBuf = 
new

byte

[MAX_LENGTH];   


           


        timeout =

;   


    }   


       


    
public

void

setIPandPort(String str,
int

pt)   


    {   


        host = str;   


        port  = pt;   


    }   


       


    
//这两个函数一定要注意 形参是基类 而实际传入的参数是子类，到时候也是调用子类的参数来做

public

void

getBufFrompara(InewsDetail nD)   


    {   


        
int

len = nD.encode(sendBuf, sendBufStart, sendBufTotalLen-sendBufStart-sendBufLen);   


           


        sendBufLen += len;   


           


    }   


       


    
public

int

decodeBufToPara(InewsDetail nD)   


    {   


        
int

len = nD.decode(recvBuf, recvBufStart, recvBufLen);   


        
if

(len>

)   
//解码正确的时候才做

{   


            recvBufLen -= len;   


            recvBufStart += len;           


        }   


           


        
return

len;    


    }   


       


    
public

void

start(InewsDetail nD)   


    {       


       


        
//这里需要先根据传入的参数来

getBufFrompara(nD);   


           


        
try

{     


            InetSocketAddress addr = 
new

InetSocketAddress(host, port);     


            
// 生成一个socketchannel

sc = SocketChannel.open();     


            sc.configureBlocking(
false

);
//

// 连接到server

sc.connect(addr);     


            
while

(!sc.finishConnect())     


                ;     


            System.out.println(
"connection has been established!…"

);     


  


           
// while (true)

{     


                
// 回射消息    // 复位，清空

w_buff.clear();     


                w_buff.put(sendBuf,sendBufStart,sendBufLen);     


                w_buff.flip();   
// 转到最开始

// 发送消息

while

(w_buff.hasRemaining())     


                    sc.write(w_buff);     


                w_buff.clear();     


  


                
// 进入接收状态

while

(
true

)   


                {   


                    
int

ss=

;   


                    
int

count;     


                    r_buff.clear();    


                    
while

(ss<timeout*

)   


                    {                           


                        count = sc.read(r_buff);   


                        
if

(count>

)   


                            
break

;   


                        ss++;   


                        Thread.currentThread().sleep(

);    


                    }     


                       


                    
if

(ss==timeout)   


                    {   


                        
break

;   


                    }   


                       


                    r_buff.flip();     


                       


                    
//判断recvBuf能不能放下接收到的数据

if

(r_buff.limit()+recvBufStart+recvBufLen>recvBufTotalLen)   


                    {   


                        
//放不下了

//那就先看看前面是不是有空余

if

(recvBufStart>

)   


                        {   


                            
for

(
int

i=

;i<recvBufStart;i++)   


                            {   


                                recvBuf
 = recvBuf[i+recvBufStart];   
                            }   
                            recvBufStart = ;   
  
                        }   
                           
                        )   
                            );   
        nsb.start(nDNS);   
           
        System.out.println(];  ];   
       
    ;  ;   
    }   
    ;   
    }   
  
    ;;   
          )   
              hour -= ;   
             
        System.out.println(seq);   
              
          ;   
          }   
          )   
                  seq = ;   
          }   
             
          ] = (+] = (]-)/+] = (]--(StreamID[]-)/+] = (]--(StreamID[]--(StreamID[]-+] = (+] = (]-)+] = (+] = (]-)+] = (+] = (]-)+] = (+] = (]-)+] = (+] = (]-)+] = (+] = (]-)+);   
        } catch (InterruptedException e) {   
            // TODO Auto-generated catch block   
            e.printStackTrace();   
        }