iOS文件操作的代码详解手机开发

NSData *condata = responseObject;   
//设置编码格式，这种编码格式可以正常读取中文   
        NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);   
        NSString *rcontent =  [[NSString alloc]initWithData:condata encoding:enc];   
        NSLog(@"suceess %@",rcontent);   
        NSString *filePath=[NSHomeDirectory() stringByAppendingFormat:@"/Documents/%@",[durl lastPathComponent]];   
//输出文件完整路径，包括文件名   
        NSLog(@"filepath %@",filePath);   
        NSData *incontent=[rcontent dataUsingEncoding:NSUTF8StringEncoding];   
        NSLog(@"ndata %@",incontent);   
//判断文件是否存在   
        if([[NSFileManager defaultManager]fileExistsAtPath:filePath])   
        {   
            NSLog(@"yes or no");   
  //删除文件   
            [[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];   
  //想文件写入内容   
            [[NSFileManager defaultManager] createFileAtPath:filePath contents:incontent attributes:nil];   
        }   
//1、获得Documents文件夹路径   
        NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);   
        NSLog(@"paths %@",paths);   
        NSFileManager *fm=[NSFileManager defaultManager];   
        NSArray *file=[fm subpathsOfDirectoryAtPath:[paths objectAtIndex:0] error:nil];   
        NSString *df=[paths objectAtIndex:0];   
//2、获得Documents文件夹路径   
        NSLog(@"sd %@",df);   
        if(!df)   
        {   
            NSLog(@"not fd");   
        }   
        else   
        {   
            NSLog(@"fd");   
        }   
        NSString *filenam=[[paths objectAtIndex:0] stringByAppendingPathComponent:@"1.txt"];   
//输出Documents文件夹下面1.txt文件的完整路径   
        NSLog(@"filennn %@",filenam);   
         //检查Documents文件夹下面1.txt文件是否存在   
        if([[NSFileManager defaultManager] fileExistsAtPath:filenam])   
        {   
            NSLog(@"find");   
        }   
//读取Documents文件夹下面1.txt文件的内容   
NSData *read=[NSData dataWithContentsOfFile:filenam];   
         NSString *ss=[[NSString alloc] initWithData:read encoding:NSUTF8StringEncoding];   
    NSLog(@”ss”,%@",ss);