post请求的分包程序

一、假如包的长度为Len,需要分x次发送

Len=Len1+Len2+..+Lenx

其实可以这样来发送就可以实现了

1）第一次直接发的内容

包头|Len
Body(Len1)

2）第二次发的

Body(Len2)

3）第X次发的

Body(Lenx)

二、程序简单举例分3次发包

// tcpSend.cpp : 定义控制台应用程序的入口点。//#include <stdio.h>#include <sys/socket.h>#include <sys/types.h>#include <time.h>#include <errno.h>#include <signal.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <sys/wait.h>#include <sys/time.h>#include <netinet/in.h>#include <arpa/inet.h>#define IPSTR "172.16.40.252"#define PORT 9080#define BUFSIZE 1024int main(int argc, char **argv){int sockfd, ret, i, h;struct sockaddr_in servaddr;char str1[4096], buf[BUFSIZE], *str;char xmlBody[4096];char xmlBody1[4096];char xmlBody2[4096];socklen_t len;fd_set   t_set1;struct timeval  tv;if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 ) {printf("创建网络连接失败,本线程即将终止---socket error!\n");exit(0);};bzero(&servaddr, sizeof(servaddr));servaddr.sin_family = AF_INET;servaddr.sin_port = htons(PORT);if (inet_pton(AF_INET, IPSTR, &servaddr.sin_addr) <= 0 ){printf("创建网络连接失败,本线程即将终止--inet_pton error!\n");exit(0);};if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0){printf("连接到服务器失败,connect error!\n");exit(0);}printf("与远端建立了连接\n");//要发送的数据sprintf(xmlBody,"Package sent three times");sprintf(xmlBody1,"Package");strcat(xmlBody2," sent three times");//发送数据str=(char *)malloc(128);len = strlen(xmlBody);sprintf(str, "%d", len);memset(str1, 0, 4096);strcat(str1, "POST /test HTTP/1.1\n");strcat(str1, "Cache-Control: no-cache\n");strcat(str1, "Pragma: no-cache\n");strcat(str1, "User-Agent: Java/1.6.0\n");strcat(str1, "Host: 172.16.40.252:8888\n");strcat(str1, "Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2\n");strcat(str1, "Connection: keep-alive\n");strcat(str1, "Content-Type: application/x-www-form-urlencoded\n");strcat(str1, "Content-Length: ");strcat(str1, str);strcat(str1, "\r\n\r\n");printf("%s\n",str1);ret = write(sockfd,str1,strlen(str1));//第一次只有包头,不会有内容ret = write(sockfd,xmlBody1,strlen(xmlBody1));//第二次发的包的内容ret = write(sockfd,xmlBody2,strlen(xmlBody2));//第三次发的包的内容if (ret < 0) {printf("发送失败！错误代码是%d，错误信息是'%s'\n",errno, strerror(errno));exit(0);}else{printf("消息发送成功，共发送了%d个字节！\n\n", ret);}FD_ZERO(&t_set1);FD_SET(sockfd, &t_set1);while(1){sleep(2);tv.tv_sec= 0;tv.tv_usec= 0;h= 0;printf("--------------->1");h= select(sockfd +1, &t_set1, NULL, NULL, &tv);printf("--------------->2");//if (h == 0) continue;if (h < 0) {close(sockfd);printf("在读取数据报文时SELECT检测到异常，该异常导致线程终止！\n");return -1;};if (h > 0){memset(buf, 0, 4096);i= read(sockfd, buf, 4095);if (i==0){close(sockfd);printf("读取数据报文时发现远端关闭，该线程终止！\n");return -1;}printf("%s\n", buf);}}close(sockfd);return 0;}

1）可以看到包的内容如下：

2）注意包的内容

<pre name="code" class="html">Content-Length: Len  -----这里的N一定要是包的内容长度，如果该Len小于包的body的内容，会导致服务器那边收到的包少几个字符串的