ios http 同步异步请求处理
转自：http://www.cnblogs.com/edisonfeng/p/3830224.html
一、服务端
1、主要结构：
2、主要代码：
1）web.xml
<?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>
2）LoginServlet.java
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);
}
}
二、客户端
1、头文件：NetCenter.h
#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
2、实现文件：NetCenter.m
#import "NetCenter.h"
@implementation NetCenter
@synthesize receiveData=_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 = [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 = [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 = [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
3、调用
- (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;
}
三、测试
1、同步get
2、同步post
3、异步get
4、异步post
三、扩展
1、http和https
http://www.cnblogs.com/stan0714/archive/2012/03/21/2409872.html
2、ios网络编程理论与实例
