<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5"     xmlns="http://java.sun.com/xml/ns/javaee"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list>  <servlet>      <servlet-name>LoginServlet</servlet-name><!--lsdkalskdfjasdkfj-->      <servlet-class>com.wiscom.servlet.LoginServlet</servlet-class>  </servlet>  <servlet-mapping>      <servlet-name>LoginServlet</servlet-name>      <url-pattern>/LoginServlet</url-pattern>  </servlet-mapping></web-app>

package com.wiscom.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class LoginServlet extends HttpServlet {  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {    // TODO Auto-generated method stub    response.setContentType("text/html;charset=utf-8");        request.setCharacterEncoding("utf-8");//设置参数解码类型，必须和页面中一致    String sName=request.getParameter("name");    String sPassword=request.getParameter("psw");        PrintWriter out = response.getWriter();    if(sName.equals("admin")&&sPassword.equals("admin")){                out.print(sName+",您已成功登陆！！");    }else{            out.print(sName+",用户名密码有误！！");    }   }    public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {      this.doGet(request, response);  }}

#import <Foundation/Foundation.h>@interface NetCenter : NSObject@property(nonatomic,retain) NSMutableData *receiveData;@property(nonatomic,assign)int dataPackSerialNo;- (void)httpGetSyn;- (void)httpPostSyn;- (void)httpGetNoSyn;- (void)httpPostNoSyn;@end

#import "NetCenter.h"@implementation NetCenter@synthesize receiveData=http://www.mamicode.com/_receiveData;@synthesize dataPackSerialNo=_dataPackSerialNo;- (void)httpGetSyn{    NSLog(@"httpGetSyn...");        /*    NSString *urlString =url;    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];    [request setURL:[NSURL URLWithString:urlString]];    [request setHTTPMethod:@"GET"];    NSHTTPURLResponse* urlResponse = nil;    NSError *error = [[NSError alloc] init];    NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];    NSMutableString *result = [[NSMutableString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];    NSLog(@"The result string is :%@",result);    */    //第一步，创建URL    NSURL *url = [NSURL URLWithString:@"http://10.0.0.96:8080/app_server/LoginServlet?name=admin&psw=admin"];        //第二步，通过URL创建网络请求    NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];    //NSURLRequest初始化方法第一个参数：请求访问路径，第二个参数：缓存协议，第三个参数：网络请求超时时间（秒）    /*    其中缓存协议是个枚举类型包含：    NSURLRequestUseProtocolCachePolicy（基础策略）    NSURLRequestReloadIgnoringLocalCacheData（忽略本地缓存）    NSURLRequestReturnCacheDataElseLoad（首先使用缓存，如果没有本地缓存，才从原地址下载）    NSURLRequestReturnCacheDataDontLoad（使用本地缓存，从不下载，如果本地没有缓存，则请求失败，此策略多用于离线操作）    NSURLRequestReloadIgnoringLocalAndRemoteCacheData（无视任何缓存策略，无论是本地的还是远程的，总是从原地址重新下载）    NSURLRequestReloadRevalidatingCacheData（如果本地缓存是有效的则不下载，其他任何情况都从原地址重新下载）    */    //第三步，连接服务器    NSData *received = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];    NSString *str = [[NSString alloc]initWithData:received encoding:NSUTF8StringEncoding];        NSLog(@"%@",str);}- (void)httpPostSyn{    NSLog(@"httpPostSyn...");        //第一步，创建URL    NSURL *url = [NSURL URLWithString:@"http://10.0.0.96:8080/app_server/LoginServlet"];        //第二步，创建请求    NSString *postStr = [[NSString alloc] initWithFormat:@"name=%@&psw=%@",@"admin",@"admin"];    NSData *postData =http://www.mamicode.com/ [postStr dataUsingEncoding:NSUTF8StringEncoding];    NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];    [request setHTTPMethod:@"POST"];//设置请求方式为POST，默认为GET    [request setHTTPBody:postData];//设置参数        //第三步，连接服务器    NSData *received = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];    NSString *backStr = [[NSString alloc]initWithData:received encoding:NSUTF8StringEncoding];        NSLog(@"%@",backStr);}- (void)httpGetNoSyn{    NSLog(@"httpGetNoSyn...");        //第一步，创建url    NSURL *url = [NSURL URLWithString:@"http://10.0.0.96:8080/app_server/LoginServlet?name=admin&psw=admin"];        //第二步，创建请求    NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];        //第三步，连接服务器    NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self];    }- (void)httpPostNoSyn{    NSLog(@"httpPostNoSyn...");        //第一步，创建url    NSURL *url = [NSURL URLWithString:@"http://10.0.0.96:8080/app_server/LoginServlet"];        //第二步，创建请求    NSString *postStr = [[NSString alloc] initWithFormat:@"name=%@&psw=%@",@"admin",@"admin"];    NSData *postData =http://www.mamicode.com/ [postStr dataUsingEncoding:NSUTF8StringEncoding];    NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];    [request setHTTPMethod:@"POST"];    [request setHTTPBody:postData];        //第三步，连接服务器    NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self];}/*************5、异步请求的代理方法[start]****************///接收到服务器回应的时候调用此方法- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{    NSHTTPURLResponse *res = (NSHTTPURLResponse *)response;    NSLog(@"%@",[res allHeaderFields]);    self.receiveData = http://www.mamicode.com/[NSMutableData data];//数据存储对象的的初始化    self.dataPackSerialNo=0;    NSLog(@"收到服务器回应。。。");}//接收到服务器传输数据的时候调用，此方法根据数据大小执行若干次-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{    NSLog(@"收到服务器传回的数据包,数据包序号：%d",self.dataPackSerialNo);    [self.receiveData appendData:data];    self.dataPackSerialNo+=1;}//数据传完之后调用此方法-(void)connectionDidFinishLoading:(NSURLConnection *)connection{    NSLog(@"数据传输完成，输出所有数据结果。。。");    NSString *receiveStr = [[NSString alloc]initWithData:self.receiveData encoding:NSUTF8StringEncoding];    NSLog(@"%@",receiveStr);}//网络请求过程中，出现任何错误（断网，连接超时等）会进入此方法-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{    NSLog(@"网络请求出错：%@",[error localizedDescription]);}/*************5、异步请求的代理方法[end]****************/@end

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];        NetCenter *netCenter=[[NetCenter alloc]init];            /*****************同步请求****************/    //[netCenter httpGetSyn];    //[netCenter httpPostSyn];        /*****************异步请求****************/    //[netCenter httpGetNoSyn];    [netCenter httpPostNoSyn];        self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];    return YES;}