#include <stdlib.h>#include <stdio.h>#include <errno.h>#include <string.h>#include <netdb.h>#include <sys/types.h>#include <netinet/in.h>#include <sys/socket.h>#include<sys/stat.h> /*stat用到*/#define BUFFER_SIZE 1024unsigned long get_file_size(char filename) /*定义一个用来获取文件大小的函数*/{ struct stat buf; if(stat(filename, &buf)<0) { return 0; } return (unsigned long)buf.st_size;}int main(int argc, char *argv[]){ int sockfd,new_fd; struct sockaddr_in server_addr; /* 服务器地址信息 */ struct sockaddr_in client_addr; /* 客户端地址信息 */ int sin_size,portnumber; int ret_send,ret_recv; if(argc!=2) { fprintf(stderr,"Usage:%s portnumber\a\n",argv[0]); exit(1); } if((portnumber=atoi(argv[1]))<0) { fprintf(stderr,"Usage:%s portnumber\a\n",argv[0]); exit(1); } if((sockfd=socket(AF_INET,SOCK_STREAM,0))==-1) /* 建立套接字 */ { fprintf(stderr,"Socket error:%s\n\a",strerror(errno)); exit(1); } bzero(&server_addr,sizeof(struct sockaddr_in)); /*把地址信息清0*/ server_addr.sin_family=AF_INET; server_addr.sin_addr.s_addr=htonl(INADDR_ANY); server_addr.sin_port=htons(portnumber); if(bind(sockfd,(struct sockaddr *)(&server_addr),sizeof(struct sockaddr))==-1) { fprintf(stderr,"Bind error:%s\n\a",strerror(errno)); exit(1); } if(listen(sockfd,5)==-1) /* 开始接收连接 ，且设置最大同时访问的客户端为5*/ { fprintf(stderr,"Listen error:%s\n\a",strerror(errno)); exit(1); } while(1) { sin_size=sizeof(struct sockaddr_in); if((new_fd=accept(sockfd,(struct sockaddr *)(&client_addr),&sin_size))==-1) { fprintf(stderr,"Accept error:%s\n\a",strerror(errno)); exit(1); } fprintf(stdout,"Server get connection from %s\n",inet_ntoa(client_addr.sin_addr)); char request[1024] = { 0 }; ret_recv = recv( new_fd, request, sizeof( request ), 0 );/*接收http连接过程客户端返回的信息，并保存在request中*/ if(ret_recv==-1) { fprintf(stderr,"Write Error:%s\n",strerror(errno)); exit(1); } printf("%s",request );/*打印出http连接过程客户端回应过来的一些信息*/ /*whatever we recv, we send 200 response */ char file_name[20]="1.jpg"; FILE * fp = fopen(file_name,"rb"); if(NULL == fp ) { printf("File:\t%s Not Found\n", file_name); } //char content[] = "<head><head><title>index.html</title></head><body>index.html</body>"; char buffer[BUFFER_SIZE]; char response[1024]; int file_block_length = 0; unsigned long file_lenght= get_file_size(file_name); //response="HTTP/1.1 200 OK\r\nContent-Type: image/jpeg\r\n\n"; sprintf( response, "HTTP/1.1 200 OK\r\nContent-Type: image/jpeg\r\nContent-Length: %l\r\n\r\n" , /*去掉了%s*/ file_lenght); /*把strlen(content)改成file_block_length，去掉了 content*/ //发送buffer中的字符串到new_fd,实际是给客户端 if(send(new_fd,response, strlen( response ),0)<0) { fprintf(stderr,"send Error:%s\n",strerror(errno)); break; } while( (file_block_length = fread(buffer,sizeof(char),BUFFER_SIZE,fp))>0) { /*while循环，直到发送完文件*/ printf("file_block_length = %d\n",file_block_length); //发送buffer中的字符串到new_fd,实际是给客户端 if(send(new_fd,buffer,file_block_length,0)<0) { printf("Send File:\t%s Failed\n", file_name); break; } bzero(buffer, BUFFER_SIZE); } fclose(fp); close(new_fd); printf("File:\t%s Transfer Finished\n",file_name); close(sockfd); exit(0); }}
