请问怎么解决servlet编译时显示不存在mybean.date？
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程序包javax.servlet不存在，并且程序包javax.servlet.http不存在等错误。我查阅了一下资料由于servlet和JSP不是java平台j2se（标准版）的一部分，而是j2EE的一部分，因此必须告知编译器servlet的位置。解决方案如下：
1.注意大小写的问题。servlet的字母要注意是小写。
2.搜索servlet-api.jar，在tomcat文件夹中。
3.更改环境变量中CLASSPATH的值，将搜索到的servlet-api.jar的路径全部复制到属性值中去。（这里要注意，复制的过程中要把后缀名.jar也要复制过去） 参考技术A 编译的时候带包名，
比如 javac myservlet\control\HandleRegister.java
UITableviewCell在ios中滚动时显示不正确
【中文标题】UITableviewCell在ios中滚动时显示不正确【英文标题】：UITableviewCell displaying incorrectly during scrolling in ios 【发布时间】：2014-04-30 11:31:37 【问题描述】：我有一个表格视图，我需要在其中显示一些问题文本及其答案类型。答案类型可以是 UISwitch (single_option)、UITextField (text_option) 和 Star Rating View (star_option)。所有问题及其答案类型均来自服务器。因此，对于每个表格行，我需要显示一个问题文本和一个答案类型，正如我在下面的屏幕截图中提到的那样。可以有 n 个问题，所以我根据问题的数量设置了它们的框架。现在，我的问题是当我向上或向下滚动时，问题显示正确，但他们的答案类型是随机出现的，而且我没有得到正确的单元格高度。
请检查，我正在附上我的代码。
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
Surveys *surveys = [[Surveys alloc] init];
surveys = [arraySurveys objectAtIndex:indexPath.row];
static NSString *CellIdentifier = @"Cell";
UITableViewCell *surveysCell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (!surveysCell)
surveysCell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
UILabel *lblSurveyQuestionText = nil;
SVSegmentedControl *segment1 = nil;
UITextField *tfAnswer = nil;
//For displaying Voting Questions
lblSurveyQuestionText = [[UILabel alloc] init];
labelHeight = [self getLabelHeightForIndex:indexPath.row];
lblSurveyQuestionText.frame = CGRectMake(10, 5, 300,labelHeight);
lblSurveyQuestionText.backgroundColor = [UIColor clearColor];
lblSurveyQuestionText.text = surveys.questions;
lblSurveyQuestionText.textAlignment = NSTextAlignmentLeft;
lblSurveyQuestionText.lineBreakMode = NSLineBreakByWordWrapping;
lblSurveyQuestionText.numberOfLines = 0;
lblSurveyQuestionText.tag = 10;
[lblSurveyQuestionText sizeToFit];
lblSurveyQuestionText.textColor = [UIColor whiteColor];
[surveysCell.contentView addSubview:lblSurveyQuestionText];
//For displaying UISwitch
NSArray *arrayOption1 = [[NSArray alloc] initWithObjects:@"Yes", @"No", nil];
segment1 = [[SVSegmentedControl alloc] initWithSectionTitles:arrayOption1];
segment1.thumb.tintColor = [UIColor colorWithRed:0.6 green:0.2 blue:0.2 alpha:1];
segment1.changeHandler = ^(NSUInteger newIndex)
NSString *selectedName = [arrayOption1 objectAtIndex:newIndex];
NSLog(@"Switch selected answer is = %@", selectedName);
;
segment1.center = CGPointMake(65, lblSurveyQuestionText.frame.size.height+27);
//For displaying text field
tfAnswer = [[UITextField alloc] init];
CGRect frameRect = CGRectMake(10, lblSurveyQuestionText.frame.size.height+13, 300, 25);
frameRect.size.height = 25;
tfAnswer.frame = frameRect;
UIView *paddingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 7, 10)];
tfAnswer.leftView = paddingView;
tfAnswer.leftViewMode = UITextFieldViewModeAlways;
tfAnswer.textColor = [UIColor colorWithRed:(59/255.0) green:(59/255.0) blue:(59/255.0) alpha:1.0];
tfAnswer.delegate = self;
tfAnswer.font = [UIFont fontWithName:@"Helvetica Neue Medium" size:16.0];
tfAnswer.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"tf_301_23.png"]];\
tfAnswer.returnKeyType = UIReturnKeyDone;
//For displaying star view
starRatingAnswer = [[TQStarRatingView alloc] initWithFrame:CGRectMake(10, lblSurveyQuestionText.frame.size.height+10, 180, 30) numberOfStar:5];
starRatingAnswer.delegate = self;
surveysCell.selectionStyle = UITableViewCellSelectionStyleNone;
tblSurveys.tableFooterView = viewSurveysBottom;
NSLog(@"Surveys answer type is = %@", surveys.answer_type);
if ([surveys.answer_type isEqualToString:@"text_option"])
[surveysCell.contentView addSubview:tfAnswer];
else if ([surveys.answer_type isEqualToString:@"single_option"])
[surveysCell.contentView addSubview:segment1];
else
[surveysCell.contentView addSubview:starRatingAnswer];
return surveysCell;
((UILabel *)[surveysCell.contentView viewWithTag:10]).text = surveys.questions;
return surveysCell;
JSON：
"Question_sq_details": [
"event_sq_qns_id": 3,
"questions": "Effectiveness of the speakers",
"answer_type": "star_option"
,
"event_sq_qns_id": 4,
"questions": "What is your primary job title/focus? Please select one.",
"answer_type": "single_option"
,
"event_sq_qns_id": 5,
"questions": "Quality of the content",
"answer_type": "star_option"
,
"event_sq_qns_id": 6,
"questions": "Usefulness of the Solutions Showcase",
"answer_type": "text_option"
,
"event_sq_qns_id": 7,
"questions": "Relevance of the Solutions Showcase to your business",
"answer_type": "star_option"
,
"event_sq_qns_id": 8,
"questions": "Relevance of the topics to your business",
"answer_type": "star_option"
,
"event_sq_qns_id": 9,
"questions": "General Comments",
"answer_type": "text_option"
]
请提出一些克服这种情况的方法。我已经尝试了很多，但使用我上面的代码似乎没有任何效果。
谢谢。
【问题讨论】：
用这个来为你带来希望***.com/questions/22862938/… 非常感谢@Anbu.Karthik..现在它的工作。但是你能告诉我如何保存他们所有的答案行。我需要将他们的答案发送回服务器？ 你能说清楚吗，你需要什么答案 okey..假设我在表格单元格上显示三个问题，答案类型为 UITextfield。所以一旦用户给出他们的答案..我需要正确保存所有答案表行。 正确保存意味着您需要将数据发送到服务器或将问题与答案对齐 【参考方案1】：您有三种类型的单元格，以不同的方式处理它们。
并且不要忘记使用预处理器宏而不是纯数字作为tags。
#define lblSurveyQuestionTextTag 10
顺便说一句，我更喜欢继承 UITableViewCell 而不是像这样搞砸。
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
Surveys *surveys = [[Surveys alloc] init];
surveys = [arraySurveys objectAtIndex:indexPath.row];
// differenct identifiers based on different type of cells
static NSString *CellIdentifier = surveys.answer_type;
UITableViewCell *surveysCell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (!surveysCell)
// Setup shared property
surveysCell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
surveysCell.selectionStyle = UITableViewCellSelectionStyleNone;
tblSurveys.tableFooterView = viewSurveysBottom;
UILabel *lblSurveyQuestionText = nil;
//For displaying Voting Questions
lblSurveyQuestionText = [[UILabel alloc] init];
labelHeight = [self getLabelHeightForIndex:indexPath.row];
lblSurveyQuestionText.frame = CGRectMake(10, 5, 300,labelHeight);
lblSurveyQuestionText.backgroundColor = [UIColor clearColor];
lblSurveyQuestionText.text = surveys.questions;
lblSurveyQuestionText.textAlignment = NSTextAlignmentLeft;
lblSurveyQuestionText.lineBreakMode = NSLineBreakByWordWrapping;
lblSurveyQuestionText.numberOfLines = 0;
lblSurveyQuestionText.tag = 10;
[lblSurveyQuestionText sizeToFit];
lblSurveyQuestionText.textColor = [UIColor whiteColor];
[surveysCell.contentView addSubview:lblSurveyQuestionText];
// end setup shared properties
if ([surveys.answer_type isEqualToString:@"text_option"]) // setup text_option type
//For displaying text field
UITextField *tfAnswer = [[UITextField alloc] init];
CGRect frameRect = CGRectMake(10, lblSurveyQuestionText.frame.size.height+13, 300, 25);
frameRect.size.height = 25;
tfAnswer.frame = frameRect;
UIView *paddingView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 7, 10)];
tfAnswer.leftView = paddingView;
tfAnswer.leftViewMode = UITextFieldViewModeAlways;
tfAnswer.textColor = [UIColor colorWithRed:(59/255.0) green:(59/255.0) blue:(59/255.0) alpha:1.0];
tfAnswer.delegate = self;
tfAnswer.font = [UIFont fontWithName:@"Helvetica Neue Medium" size:16.0];
tfAnswer.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"tf_301_23.png"]];\
tfAnswer.returnKeyType = UIReturnKeyDone;
tfAnswer.tag = 2555;
[surveysCell.contentView addSubview:tfAnswer];
else if ([surveys.answer_type isEqualToString:@"single_option"]) // setup single_option type
//For displaying UISwitch
NSArray *arrayOption1 = [[NSArray alloc] initWithObjects:@"Yes", @"No", nil];
SVSegmentedControl *segment1 = [[SVSegmentedControl alloc] initWithSectionTitles:arrayOption1];
segment1.thumb.tintColor = [UIColor colorWithRed:0.6 green:0.2 blue:0.2 alpha:1];
segment1.center = CGPointMake(65, lblSurveyQuestionText.frame.size.height+27);
segment1.changeHandler = ^(NSUInteger newIndex)
NSString *selectedName = [arrayOption1 objectAtIndex:newIndex];
NSLog(@"Switch selected answer is = %@", selectedName);
;
segment1.tag = 2556;
[surveysCell.contentView addSubview:segment1];
else // setup star type
//For displaying star view
/* TQStarRatingView * */starRatingAnswer = [[TQStarRatingView alloc] initWithFrame:CGRectMake(10, lblSurveyQuestionText.frame.size.height+10, 180, 30) numberOfStar:5];
starRatingAnswer.delegate = self;
starRatingAnswer.tag = 2557;
[surveysCell.contentView addSubview:starRatingAnswer];
if ([surveys.answer_type isEqualToString:@"text_option"])
UITextField *tfAnswer = (UITextField*)[surveysCell.contentView viewWithTag:2555];
// tfAnswer.text = @""
else if ([surveys.answer_type isEqualToString:@"single_option"])
SVSegmentedControl *segment1 = (SVSegmentedControl*)[surveysCell.contentView viewWithTag:2556];
// segment1.selectedIndex = 1;
else
TQStarRatingView *starRatingAnswer = (TQStarRatingView*)[surveysCell.contentView viewWithTag:2557];
// starRatingAnswer.stars = 5;
// NSlog cause performance loss in TableView, turn it off when not needed or release/adhoc builds
NSLog(@"Surveys answer type is = %@", surveys.answer_type);
((UILabel *)[surveysCell.contentView viewWithTag:10]).text = surveys.questions;
return surveysCell;
【讨论】：
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