1. 连接百度服务器
// 1. 连接百度的服务器
BOOL result = [self connectIp:@"220.181.111.188" port:80];
if (!result) {
NSLog(@"连接失败");
return;
}
NSLog(@"连接成功");
// 连接服务器
- (BOOL)connectIp:(NSString *)ip port:(int)port {
int clientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
self.clientSocket = clientSocket;
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr(ip.UTF8String);
addr.sin_port = htons(port);
int result = connect(clientSocket, (const struct sockaddr *) &addr, sizeof(addr));
if (result == 0) {
return YES;
} else {
return NO;
}
}
2. 构造请求头
// 模拟构造Http请求头
NSString *request = @"GET / HTTP/1.1\r\n"
"Host: www.baidu.com\r\n"
"\r\n";
NSLog(@"%@", request);
3. 访问服务器，并获取返回内容
// 服务器返回的响应头 响应体
NSString *response = [self sendAndRecv:request];
NSLog(@"返回的数据: %@", response);
// 发送和接收数据
- (NSString *) sendAndRecv:(NSString *)sendMsg {
const char *msg = sendMsg.UTF8String;
ssize_t sendCount = send(self.clientSocket, msg, strlen(msg), 0);
NSLog(@"发送的字节数 %zd", sendCount);
uint8_t buffer[1024];
NSMutableData *datas = [NSMutableData data];
ssize_t recvCount = recv(self.clientSocket, buffer, sizeof(buffer), 0);
[datas appendBytes:buffer length:recvCount];
while (recvCount != 0) {
recvCount = recv(self.clientSocket, buffer, sizeof(buffer), 0);
NSLog(@"接收的字节数 %zd", recvCount);
[datas appendBytes:buffer length:recvCount];
}
NSString *recvMsg = [[NSString alloc] initWithData:datas encoding:NSUTF8StringEncoding];
return recvMsg;
}
4. 关闭连接，并将网页显示在UIWebView中
// 关闭连接
close(self.clientSocket);
// 截取响应头，只保留响应体， 响应头结束的标识 \r\n\r\n
// 找指定字符串所在的范围，从它之后的第一个位置开始截取字符串
NSRange range = [response rangeOfString:@"\r\n\r\n"];
// 截取响应体
NSString *html = [response substringFromIndex:range.length + range.location];
// baseURL为html依赖的外部文件所在的地址
[self.webView loadHTMLString:html baseURL:[NSURL URLWithString:@"http://www.baidu.com"]];
5. 完成第四步之后，返回的网页是PC版的
要想使得返回的网页是手机版的，需要在添加请求头时添加"User-Agent"这个请求头，将第2步的请求头内容更改为
// 模拟构造Http请求头
NSString *request = @"GET / HTTP/1.1\r\n"
"Host: www.baidu.com\r\n"
"User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)\r\n"
"Connection: keep-alive\r\n"
"\r\n";
NSLog(@"%@", request);
6. 完成代码
//
// ViewController.m
// 请求百度
//
// Created by mazaiting on 18/1/3.
// Copyright © 2018年 mazaiting. All rights reserved.
//
#import "ViewController.h"
#import <sys/socket.h>
#import <netinet/in.h>
#import <arpa/inet.h>
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIWebView *webView;
@property (nonatomic, assign) int clientSocket;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// 1. 连接百度的服务器
BOOL result = [self connectIp:@"220.181.111.188" port:80];
if (!result) {
NSLog(@"连接失败");
return;
}
NSLog(@"连接成功");
// 模拟构造Http请求头
NSString *request = @"GET / HTTP/1.1\r\n"
"Host: www.baidu.com\r\n"
"User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)\r\n"
"Connection: keep-alive\r\n"
"\r\n";
NSLog(@"%@", request);
// 服务器返回的响应头 响应体
NSString *response = [self sendAndRecv:request];
NSLog(@"返回的数据: %@", response);
// 关闭连接
close(self.clientSocket);
// 截取响应头，只保留响应体， 响应头结束的标识 \r\n\r\n
// 找指定字符串所在的范围，从它之后的第一个位置开始截取字符串
NSRange range = [response rangeOfString:@"\r\n\r\n"];
// 截取响应体
NSString *html = [response substringFromIndex:range.length + range.location];
// baseURL为html依赖的外部文件所在的地址
[self.webView loadHTMLString:html baseURL:[NSURL URLWithString:@"http://www.baidu.com"]];
}
// 连接服务器
- (BOOL)connectIp:(NSString *)ip port:(int)port {
int clientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
self.clientSocket = clientSocket;
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr(ip.UTF8String);
addr.sin_port = htons(port);
int result = connect(clientSocket, (const struct sockaddr *) &addr, sizeof(addr));
if (result == 0) {
return YES;
} else {
return NO;
}
}
// 发送和接收数据
- (NSString *) sendAndRecv:(NSString *)sendMsg {
const char *msg = sendMsg.UTF8String;
ssize_t sendCount = send(self.clientSocket, msg, strlen(msg), 0);
NSLog(@"发送的字节数 %zd", sendCount);
uint8_t buffer[1024];
NSMutableData *datas = [NSMutableData data];
ssize_t recvCount = recv(self.clientSocket, buffer, sizeof(buffer), 0);
[datas appendBytes:buffer length:recvCount];
while (recvCount != 0) {
recvCount = recv(self.clientSocket, buffer, sizeof(buffer), 0);
NSLog(@"接收的字节数 %zd", recvCount);
[datas appendBytes:buffer length:recvCount];
}
NSString *recvMsg = [[NSString alloc] initWithData:datas encoding:NSUTF8StringEncoding];
return recvMsg;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (BOOL)prefersStatusBarHidden{
return YES;
}
@end
