我不能传递对象项目如果没有对象为null。如何将对象从html传递到spring控制器？
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Home</title>
</head>
<body>
<form action="/addproject" method="POST">
<input type="hidden" name="project" th:value="${project}"/>
<input type="submit" value="Save Project" class="submit">
</form>
</body>
</html>
@Controller
public class ProjectController {
@GetMapping("/")
public String indexPage(Model model) {
model.addAttribute("project", new Project("Test", "Test"));
return "index";
}
@PostMapping("/addproject")
public String add(WebRequest webRequest) {
Project p = (Project) webRequest.getAttribute("project", WebRequest.SCOPE_REQUEST);
return "index";
}
}
请查看本文。简而言之，您需要将所需对象传递给ModelAndView，而不是Model:
@GetMapping("/")
public ModelAndView indexPage(Model model) {
ModelAndView mav = new ModelAndView("index");
mav.addObject("project", new Project("Test", "Test"));
return mav;
}
并从模板中按名称访问：
<b th:text="${project.attribute}">Text ...</b>
我建议您先处理这里的文档。
您对ModelAndView没有任何要求或问题。
当你第一次调用/project页面时，项目类信息将由@GetMapping加载，如果你愿意，当你更改并提交时，它将被@PostMapping捕获。
project.html文件：
<!DOCTYPE HTML>
<html xmlns:th="https://www.thymeleaf.org">
<head>
<title>Project Form</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<h1>Project Form</h1>
<form method="post" th:action="@{/project}" th:object="${project}">
<p>Name: <input type="text" th:field="*{name}" /></p>
<p>Description: <input type="text" th:field="*{description}" /></p>
<p><input type="submit" value="Submit" /> </p>
</form>
</body>
</html>
Project.java文件：
public class Project {
private String name;
private String description;
public Project(String name, String description) {
this.name = name;
this.description = description;
}
// getter/setter ...
}
ProjectController.java文件：
@Controller
public class ProjectController {
@GetMapping("/project")
public String greetingForm(Model model) {
model.addAttribute("project", new Project("PN1", "PD1"));
return "project";
}
@PostMapping("/project")
public String greetingSubmit(@ModelAttribute Project project, Model model) {
model.addAttribute("project", project);
return "project";
}
}