java我对th有问题：如果在春天
所以我开始学习java+Spring，我对“th:if”有一个问题。当我想在本地主机上打印时：8080/car yearof production=2000，我使用 th:info=“${info}=='2000'”在我的模板中，什么都不会发生，但当我删除th:info=“${info}=='2000'”时，一切都正常，这意味着当我在1999年的生产年中写下我的应用程序在我写的本地主机年打印时
我的控制器类：
@Controller 公共车厢{
@RequestMapping(value = "/car", method = RequestMethod.POST)
public String carPost(@ModelAttribute("carForm") CarForm form, Model model) {
model.addAttribute("info", "Rok produkcji samochodu to: " + form.getYearOfProduction());
return "cars";
}
@RequestMapping(value = "/car", method = RequestMethod.GET)
public String carPost(Model model) {
model.addAttribute("carForm", new CarForm());
return "car";
}
}
我的班级：
public class CarForm {
private String carname;
private String yearOfProduction;
public CarForm(String carname, String yearOfProduction) {
this.carname = carname;
this.yearOfProduction = yearOfProduction;
}
public CarForm() {
}
public String getCarname() {
return carname;
}
public void setCarname(String carname) {
this.carname = carname;
}
public String getYearOfProduction() {
return yearOfProduction;
}
public void setYearOfProduction(String yearOfProduction) {
this.yearOfProduction = yearOfProduction;
}
}
还有我的模板：
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org/">
<head>
<title>Title</title>
</head>
<body>
<center><span th:if="${info} == '2000'" th:text="${info}"></span></center>
</br></br>
<form th:action="@{/car}" method="post" th:object="${carForm}">
Car name: <input type="text" th:field="*{carname}">
<p></p>
year of production: <input type="text" th:field="*{yearOfProduction}">
<p></p>
<input type="submit" value="send">
</form>
</body>
</html>
# 1 楼答案
如果您只需要根据任何条件打印任何信息，为什么不尝试以下方法：
或者，如果你真的需要
if标签，那么：你可能想快速阅读一下Thymeleaf comparators and equality
# 2 楼答案
可以使用Stringsutils：