来源: 互联网  发布时间: 2014-02-18

保存数据的一系列方法

 

/*=======================================================
NSKeyedArchiver
========================================================*/
NSString *str = @"abc";
NSString *astr = @"efg";
NSArray *Array = [NSArray arrayWithObjects:str, astr, nil];
 
//Save
NSString *Path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; NSString *filename = [Path stringByAppendingPathComponent:@"test"];
[NSKeyedArchiver archiveRootObject:Array toFile:filename];
 
str = @"a";
astr = @"";
 
//load
NSArray *arr = [NSKeyedUnarchiver unarchiveObjectWithFile: filename];
str = [arr objectAtIndex:0];
astr =  [arr objectAtIndex:1];
 
NSLog(@"str:%@",str);
NSLog(@"astr:%@",astr);
 
 
 
/*=======================================================
NSUserDefaults
========================================================*/
NSString *str = @"abc";
NSString *astr = @"efg";
NSArray *Array = [NSArray arrayWithObjects:str, astr, nil];
 
//Save
NSUserDefaults *SaveDefaults = [NSUserDefaults standardUserDefaults];
[SaveDefaults setObject:Array forKey:@"SaveKey"];
 
str = @"a";
astr = @"";
 
//load
Array = [SaveDefaults objectForKey:@"SaveKey"];
str = [Array objectAtIndex:0];
astr = [Array objectAtIndex:1];
NSLog(@"str:%@",str);
NSLog(@"astr:%@",astr);
 
 
 
 
/*=======================================================
writeToFile:
========================================================*/
NSString *str = @"abc";
NSString *astr = @"efg";
NSArray *Array = [NSArray arrayWithObjects:str, astr, nil];
 
//Save
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
if (!documentsDirectory) {
    NSLog(@"Documents directory not found!");
}
NSString *appFile = [documentsDirectory stringByAppendingPathComponent:@"Savedatas.plist"];
[[NSArray arrayWithObjects:Array,nil] writeToFile:appFile atomically:NO];    
 
 
//load
if([[NSFileManager defaultManager] fileExistsAtPath:appFile])
    self.SaveDataArray = [NSMutableArray arrayWithContentsOfFile:appFile];        
else
    self.SaveDataArray = [NSMutableArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"Savedatas" ofType:@"plist"]];
NSArray *strArray = [self.SaveDataArray objectAtIndex:0];
 
str = [strArray objectAtIndex:0];
astr = [strArray objectAtIndex:1];
 
 
 
 
 
//坛子里的，搬过来。。。。。
-(BOOL) writeApplicationData:(NSDictionary *)data  writeFileName:(NSString *)fileName
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    if (!documentsDirectory) {
        NSLog(@"Documents directory not found!");
        return NO;
    }
    NSString *appFile = [documentsDirectory stringByAppendingPathComponent:fileName];
    return ([data writeToFile:appFile atomically:YES]);
}
 
-(id) readApplicationData:(NSString *)fileName
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *appFile = [documentsDirectory stringByAppendingPathComponent:fileName];
    NSDictionary *myData = [[[NSDictionary alloc] initWithContentsOfFile:appFile] autorelease];
    return myData;
}
 

    

    来源: 互联网  发布时间: 2014-02-18

日期处理

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
    [dateFormatter setTimeStyle:NSDateFormatterShortStyle];
    //[dateFormatter setDateFormat:@"hh:mm:ss"]
    [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss.SSS"];
    NSLog(@"Date%@", [dateFormatter stringFromDate:[NSDate date]]);
    [dateFormatter release];

 //initializtion parameter

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *now;
NSDateComponents *comps = [[NSDateComponents alloc] init];
NSInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit | 
                                         NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
now=[NSDate date];
comps = [calendar components:unitFlags fromDate:now];
week = [comps weekday];    
month = [comps month];
day = [comps day];
hour = [comps hour];
min = [comps minute];
sec = [comps second];

//Week:
1 －－星期天
2－－星期一
3－－星期二
4－－星期三
5－－星期四
6－－星期五
7－－星期六

 

    

    来源: 互联网  发布时间: 2014-02-18

wap文本框缓存清除解决办法
由于手机浏览器缓存的问题，我们会发现在WAP中修改记录点进去时候仍然是上一条记录信息，也就是缓存信息，比方说修改新闻，修改个人资料等。本人在网上找了很多资料，如有网友提出 加一个禁止缓存代码，如下

<meta http-equiv="Cache-Control" content="no-cache"/><!-- 禁止浏览器从缓存中访问页面内容 -->

<meta http-equiv="Expires"   content="0"/> 

<meta http-equiv="Pragma"   content="no-cache"/> 

但是在实际测试过程中，仍然没用。

经过一番思考，想到了一个解决方法，就是将每次修改记录的表单里面的文本框等名字变不同，即可。那样也无所谓缓存了，通过这个思路，下面以JSP为例子给大家提供一个简单说明：

我们在页面上生成一个随机数：String ID= (int)(Math.random()*100+100)+"";

设置ID=request.QueryString("ID")

文本框的名称name设置为：name="title<%=ID%>"

提交处：<postfield name="title" value="$title<%=ID%>"/>

这样每次修改进去，由于表单名称都不同，因此就会读取最新记录，而不是缓存信息！

代码如下：

<%@ page language="java" contentType="text/vnd.wap.wml; charset=GB2312"
        import="java.util.HashMap"
        import="com.kingtop.pfb.*"
%>
%><?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.1//EN" "http://www.wapforum.org/DTD/wml_1.1.xml">
<wml>
<head>
  <meta http-equiv="Cache-Control" content="max-age=0" forua="true"/>
  <meta http-equiv="Cache-Control" content="no-cache"/>
</head>
<card id="Home" title="加入电子优惠券">
<%
String aa = (int)(Math.random()*100+100)+"";
String s___	 = String.valueOf(System.currentTimeMillis());
String m = request.getParameter("m");
String code = request.getParameter("code");
EwmWapClient ewc = new EwmWapClient();
Object[] data = null;
if ( !"".equals(m))
{ 
	data = ewc.yhq_add_kc(m,code);
	int ret = Integer.parseInt((String)data[0]);
	String msg = (String)data[1];
	if ( ret == 0 )  {
		out.println("<a href=/index.html"youhuiquan.jsp?m="+m+"&s___="+s___+"\">增加成功，进入列表</a>"); 
	}else{
		out.println(msg);
	}
}
out.println("m="+m);
out.println("code="+code);
out.print("aa="+aa);
%>
<p align="left">
<fieldset title="加入电子优惠券">
手机号:<input type="text" name="m<%=aa %>" size="12" format="*n" maxlength="11"/><br/>
数字码:<input type="text" name="code<%=aa %>" size="13" format="*n" maxlength="12"/>
</fieldset>
<anchor title="手机号">
<go method="post" href="/blog_article/<%=request/s___/lt;%/s___%/gt;.getRequestURI()%>">
<postfield name="m" value="$(m<%=aa %>)"/>
<postfield name="code" value="$(code<%=aa %>)"/>
</go>提交
</anchor>

<br/><br/><a href="/blog_article/index/s___/lt;%/s___%/gt;.html">返回</a>
</p>
</card>
</wml>