#import "ViewController.h" @implementation ViewController -(void)aaa:(UIButton *)btn {     NSString *method=[NSString stringWithFormat:@"login"];     NSString *username=[NSString stringWithFormat:@"123"];     NSString *password=[NSString stringWithFormat:@"123"];     NSString *urlString= [NSString stringWithFormat:@"http://192.168.1.107:8080/ipTest/test.do?%@%@&%@%@&%@%@",@"method=",method,@"username=",username,@"password=",password];        ASIFormDataRequest *requestForm = [[ASIFormDataRequest alloc] initWithURL:[NSURL URLWithString:urlString]];     //设置需要POST的数据，这里提交两个数据，A=a&B=b     //[requestForm setPostValue:@"a" forKey:@"A"];     //[requestForm setPostValue:@"b" forKey:@"B"];     [requestForm startSynchronous];          //输入返回的信息     NSLog(@"response\n%@",[requestForm responseString]);     [requestForm release]; } - (void)viewDidLoad {     [super viewDidLoad];     button1=[[UIButton alloc]initWithFrame:CGRectMake(200, 200, 50, 50)];     button1.backgroundColor=[UIColor redColor];     [self.view addSubview:button1];     [button1 addTarget:self action:@selector(aaa:) forControlEvents:UIControlEventTouchUpInside]; // Do any additional setup after loading the view, typically from a nib. } - (void)viewDidUnload {     [super viewDidUnload];     // Release any retained subviews of the main view. } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {     return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); }

客户端想要访问服务器 必须加上服务器的ip 服务端我是这样实现的。。。

服务器是用java开发的

public void doLogin(HttpServletRequest request,HttpServletResponse response) throws IOException{   String username=request.getParameter("username");   String password=request.getParameter("password");   String getStr=request.getParameter("A");   System.out.println("用户名:"+username+ "密码:"+password);   getAddr(request);   PrintWriter out=response.getWriter();   String msg=null;   if(username!=null&&username.equals("123")&&password!=null &&password.equals("123")&& getStr!=null&&getStr.equals("a")){    msg="登陆成功";   }   else   {    msg="登陆失败";   }     out.print(msg);   out.flush();   out.close();  }