• ViewController

// ViewController.h
#import <UIKit/UIKit.h>

@interface ViewController : UIViewController


@end

// ViewController.m
#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [self post];

}

-(void)get
{
    //0.确定请求路径字符串
    //把字符串转换为URL的时候内部不能包含中文
    //http://120.25.226.186:32812/login2?username=%E5%B0%8F%E7%A0%81%E5%93%A5&pwd=520it&type=JSON
    //NSString *urlStr = @"http://120.25.226.186:32812/login2?username=%E5%B0%8F%E7%A0%81%E5%93%A5&pwd=520it&type=JSON";

    NSString *urlStr = @"http://120.25.226.186:32812/login2?username=故宫&pwd=123&type=JSON";
    NSLog(@"转码前 urlstr:%@",urlStr);

    //对中文进行转码
    urlStr  = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSLog(@"转码后 urlstr:%@",urlStr);

    //1.确定URL
    NSURL *url = [NSURL URLWithString:urlStr];

    //2.创建可变的请求对象
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

    //3.发送GET请求
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {

        //4.解析数据
        NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);

        NSLog(@"%@",connectionError);
    }];

}

-(void)post
{
    //0.确定请求路径字符串

    NSString *urlStr = @"http://120.25.226.186:32812/login2";

    //1.确定URL
    NSURL *url = [NSURL URLWithString:urlStr];

    //2.创建可变的请求对象
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

    request.HTTPMethod = @"POST";
    request.HTTPBody = [@"username=故宫&pwd=123&type=JSON" dataUsingEncoding:NSUTF8StringEncoding];

    //3.发送GET请求
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {

        //4.解析数据
        NSLog(@"%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);

        NSLog(@"%@",connectionError);
    }];

}