ivy模块化资料 - jetty札记 - 优化——UIScrollView经过内容延迟加载以达到平滑滑动

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▪ivy模块化资料 ivy模块化文件 <ivy-module version="2.0"> <info organisation="org.apache" module="hello-ivy" /> <dependencies defaultconfmapping="*->default,sources"> <dependency org="commons-lang" name="commons-lang" rev="2.3" /> .........

▪ jetty札记 jetty笔记 package com.bierbobo;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.mortbay.j.........

▪ 优化——UIScrollView经过内容延迟加载以达到平滑滑动优化——UIScrollView通过内容延迟加载以达到平滑滑动。原文链接: http://blog.sina.com.cn/s/blog_6297d52d01010dqz.html 前面写了一篇《UIScrollView 平滑划动处理》,是通过延迟操作来达到平滑移动，.........

[1]ivy模块化资料

来源: 互联网发布时间: 2014-02-18

ivy模块化文件
<ivy-module version="2.0">
<info organisation="org.apache" module="hello-ivy" />

<dependencies defaultconfmapping="*->default,sources">
<dependency org="commons-lang" name="commons-lang" rev="2.3" />
<dependency org="commons-cli" name="commons-cli" rev="1.0" />
<dependency org="log4j" name="log4j" rev="1.2.15" conf="default->master" />
<dependency org="junit" name="junit" rev="4.6" />
<dependency org="org.mortbay.jetty" name="jetty" rev="6.1.22" />
</dependencies>









</ivy-module>

[2] jetty札记

来源: 互联网发布时间: 2014-02-18

jetty笔记
package com.bierbobo;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.mortbay.jetty.Connector;
import org.mortbay.jetty.Handler;
import org.mortbay.jetty.HttpConnection;
import org.mortbay.jetty.Request;
import org.mortbay.jetty.Server;
import org.mortbay.jetty.handler.AbstractHandler;
import org.mortbay.jetty.handler.ContextHandler;
import org.mortbay.jetty.handler.HandlerCollection;
import org.mortbay.jetty.nio.SelectChannelConnector;
import org.mortbay.jetty.servlet.Context;
import org.mortbay.jetty.servlet.DefaultServlet;
import org.mortbay.jetty.servlet.ServletHolder;
import org.mortbay.jetty.webapp.WebAppContext;

public class JettyTest {

/*
* 1、jar配置 lib : jetty jetty-util servlet-api
* jsp-2.1: ant core jsp jsp-api
*
* 2、 Server(服务器) Connector(连接器) Handler(处理器)
*
* 3、 web配置文件发布正常的servlet addServlet可以发布内部servlet类
*/

public static void main(String[] args) throws Exception {

// 1:定义server
Server server = new Server(8020);

// 2:把连接器集合放到server里,可以在Server定义端口来代替
// addConnect(server);

// 3:并把处理器集合放到server里

// handlerCollection(server);
//
// contextHandler(server);
//
// context(server);

webAppContext(server);

// 4:启动server
server.start();
server.join();

}

/**
* 为Server设置连接器，可以通过new Server(8020)简单的设置连接器为SocketConnector连接器
* @param server
*/
private static void addConnect(Server server) {
Connector connector = new SelectChannelConnector();
connector.setPort(8020);
server.setConnectors(new Connector[] { connector });
}

/**
* 多个处理器即处理器集合：连接器的请求都会在每个处理器中处理
* @param server
*/
private static void handlerCollection(Server server) {
HandlerCollection handlers = new HandlerCollection();
Handler hello = new HelloHandler();
handlers.setHandlers(new Handler[] { hello });
server.setHandler(handlers);
}

/**
* 上下文处理器：一般处理来自web的请求。
* 如果要想处理servlet请求的话，首先要添加defaultservlet（拦截路径为全部），其次在增加自己的servlet，如下。
*
* @param server
*/
private static void contextHandler(Server server) {
ContextHandler context = new ContextHandler();
context.setContextPath("/");
Handler handler = new HelloHandler();
context.setHandler(handler);

server.setHandler(context);
}

private static void context(Server server) {

Context context = new Context(server, "/", Context.SESSIONS);

ServletHolder holder = new ServletHolder(DefaultServlet.class);
holder.setInitParameter("dirAllowed", "true");
holder.setInitParameter("welcomeServlets", "index.html");
holder.setInitParameter("resourceBase", "jetty/web");
context.addServlet(holder, "/*");

context.addServlet(new ServletHolder(new HelloServlet("li")),"/hello");
}

/**
* web请求处理器：上下文处理器的升级，专门处理web请求，不在需要增加defaultservlet。
* @param server
*/
private static void webAppContext(Server server) {

WebAppContext webapp = new WebAppContext(server, "web", "/");
webapp.addServlet(new ServletHolder(new HelloServlet("A")), "/A");
webapp.addServlet(new ServletHolder(new HelloServlet("B")), "/B");

// webapp.setContextPath("/");
// webapp.setResourceBase("jetty/web");
// server.setHandler(webapp);
}

static class HelloHandler extends AbstractHandler {

public void handle(String target, HttpServletRequest request,
HttpServletResponse response, int dispatch) throws IOException,
ServletException {

Request base_request = (request instanceof Request) ? (Request) request
: HttpConnection.getCurrentConnection().getRequest();
base_request.setHandled(true);

response.setContentType("text/html");
response.setStatus(HttpServletResponse.SC_OK);
response.getWriter().println("<h1>Hello OneHandler</h1>");
}

}

static class HelloServlet extends HttpServlet {

private static final long serialVersionUID = 1L;
private String greeting = "Hello World";

public HelloServlet() {
}

public HelloServlet(String greeting) {
this.greeting = greeting;
}

protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException,
IOException {
System.out.println("收到请求");
response.setContentType("text/html");
response.setStatus(HttpServletResponse.SC_OK);
response.getWriter().println("<h1>" + greeting + "</h1>");
response.getWriter().println(
"session=" + request.getSession(true).getId());
response.getWriter().flush();
System.out.println("请求处理完成");
}

}
}

[3] 优化——UIScrollView经过内容延迟加载以达到平滑滑动

来源: 互联网发布时间: 2014-02-18

优化——UIScrollView通过内容延迟加载以达到平滑滑动。

原文链接: http://blog.sina.com.cn/s/blog_6297d52d01010dqz.html

前面写了一篇《UIScrollView 平滑划动处理》,是通过延迟操作来达到平滑移动，但操作起来比较生涩，而且逻辑较复杂，现在已经弃之不用。

前文已经提到，将所有的内容页全部加入到ScrollView是最简单的方法，而且能够非常平滑划动，但如果是大数据量的时候，明显是不适用的。最近参考了Three20的TTScrollView以及TTPhotoViewController后，终于找到了一种内容页延迟加载的方法，其实iOS设备上的照片浏览就是通过延迟加载的方式实现的，当你快速划动的时候，加载的是缩略图，然后再装入原图。

同样是三页轮转ScrollView.m：

[cpp] view plaincopy

_scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.width, self.view.height)];

_scrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;

_scrollView.backgroundColor = [UIColor clearColor];

_scrollView.contentSize = _scrollView.frame.size;

_scrollView.pagingEnabled = YES;

_scrollView.delegate = self;

[self.view addSubview:_scrollView];

CGRect scrollviewFrame = CGRectMake(0, 0, _scrollView.width, _scrollView.height);

_currentPageView = [[ContentView alloc] initWithFrame:scrollviewFrame];

_prevPageView = [[ContentView alloc] initWithFrame:scrollviewFrame];

_nextPageView = [[ContentView alloc] initWithFrame:scrollviewFrame];

[_scrollView addSubview:_prevPageView];

[_scrollView addSubview:_nextPageView];

[_scrollView addSubview:_currentPageView];

_prevPageView.autoresizingMask = _nextPageView.autoresizingMask =

_currentPageView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

翻页过程中（scrollViewDidScroll），进行必要的即时更新，但这个更新操作必须尽量少，以免影响划动的平滑体验，如加载较小的缩略图。而在翻页后，再通过延时操作载入全部内容进行更新。这样处理后的体验就跟iOS设备上原生的照片App一样，快速划动载入的是缩略图，停顿后则延迟载入正常的图片。

[cpp] view plaincopy

//更新操作

- (void)loadContentView:(ContentView *)contentView withPageIndex:(NSInteger)page isDelay:(BOOL)isDelay

{

//判断越界

if ((_numberOfPages <= 0))

{

return;

}

Feed *feedData = nil;

if (page >= 0 && page < _feedDatas.count)

{

feedData = [_feedDatas objectAtIndex:page];

}

if (feedData != contentView.feedData)

{

//内容不一致，则调用延迟更新

[contentView loadContentWithFeed:feedData isDelay:isDelay];

}

#pragma mark -

#pragma mark UIScrollView

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

{

NSInteger page = floor((_scrollView.contentOffset.x - _scrollView.width / 2) / _scrollView.width) + 1;

if (_currentPageIndex == page || page > _numberOfPages - 1 || page < 0)

{

return;

}

//换页操作

ContentView *tempPageView = nil;

//next page

if (_currentPageIndex + 1 == page)

{

tempPageView = _currentPageView;

_currentPageView = _nextPageView;

_nextPageView = _prevPageView;

_prevPageView = tempPageView;

[_nextPageView clearContent];

}

//prev page

else if (_currentPageIndex - 1 == page)

{

tempPageView = _currentPageView;

_currentPageView = _prevPageView;

_prevPageView = _nextPageView;

_nextPageView = tempPageView;

[_prevPageView clearContent];

}

_currentPageIndex = page;

_currentPageView.left = _scrollView.width * _currentPageIndex;

_prevPageView.right = _currentPageView.left;

_nextPageView.left = _currentPageView.right;

//即时的更新，如载入缩略图等

}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate

{

if (!decelerate)

{

[self scrollViewDidEndDecelerating:scrollView];

}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

{

//延迟更新操作，这里是调用每个页面的延迟更新操作

//这里的更新稍显复杂，如果每个页面只是UIImageView的话，则可直接通过NSTimer延迟载入内容

[self loadContentView:_currentPageView withPageIndex:_currentPageIndex isDelay:YES];

[self loadContentView:_nextPageView withPageIndex:(_currentPageIndex + 1) isDelay:YES];

[self loadContentView:_prevPageView withPageIndex:(_currentPageIndex - 1) isDelay:YES];

}

而页面（ContentView ）内部的延迟更新代码则为：

[cpp] view plaincopy

static const NSTimeInterval kContentLoadDelay = 0.5;

- (void)loadContentBody

{

//更新ContentView的延迟内容

//.......

[_activityIndicatorView stopAnimating];

}

- (void)loadContentDelayed

{

_loadTimer = nil;

[self loadContentBody];

}

- (void)startContentLoadTimer:(NSTimeInterval)delay

{

[_activityIndicatorView startAnimating];

[_loadTimer invalidate];

_loadTimer = [NSTimer scheduledTimerWithTimeInterval:delay

target:self

selector:@selector(loadContentDelayed)

userInfo:nil

repeats:NO];

}

- (void)loadContentWithFeed:(Feed *)feed isDelay:(BOOL)isDelay

{

//content相同则退出

if (feed == self.feedData)

{

return;

}

//清空content（会同时清空feedData）后赋值

[self clearContent];

self.feedData = feed;

if (nil == self.feedData)

{

return;

}

[_activityIndicatorView startAnimating];

[self loadContentHeader];

if (isDelay)

{

//真正的延迟处理

[self startContentLoadTimer:kContentLoadDelay];

}

else

{

[self loadContentBody];

}

代码示例：http://download.csdn.net/detail/gavinming/4058379
代码非常简单，很容易理解，如有更好的方法或者意见，欢迎指点。