[英]Geting HTTP Status 400 - Required MultipartFile parameter 'file' is not present in spring
[英]Spring 4 - HTTP Status 400, Required parameter is not present
我在index.jsp中有Spring表单:
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<html>
<body>
<form:form action="save" name="employeeDTO" method="POST">
<label for="name">Name</label><input id="name" type="text" required><br>
<label for="surname">Surname</label><input id="surname" type="text" required><br>
<label for="email">E-mail</label><input id="email" type="email" required><br>
<label for="salary">Salary</label><input id="salary" type="number" required><br>
<input type="submit" value="Save">
</form:form>
</body>
</html>
在WorkController.java中我尝试映射表单提交(此时,它不对数据做任何事情):
@Controller
public class WorkController {
@RequestMapping(value = "/save", method = RequestMethod.POST)
public String save(@RequestParam EmployeeDTO employeeDTO){
return "saved";
}
}
但我得到HTTP 400状态: Required EmployeeDTO parameter 'employeeDTO' is not present
描述: The request sent by the client was syntactically incorrect.
有EmployeeDTO.java :
public class EmployeeDTO implements Serializable, DTO {
private Long id;
private String name;
private String surname;
private String email;
private Double salary;
public EmployeeDTO(){}
public EmployeeDTO(Long id, String name, String surname, String email, Double salary){
this.id = id;
this.name = name;
this.surname = surname;
this.email = email;
this.salary = salary;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSurname() {
return surname;
}
public void setSurname(String surname) {
this.surname = surname;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Double getSalary() {
return salary;
}
public void setSalary(Double salary) {
this.salary = salary;
}
@Override
public Serializable toEntity() {
return new Employee(getId(), getName(), getSurname(), getEmail(), getSalary());
}
}
如果我从save
方法签名中删除@RequestParam EmployeeDTO employeeDTO
- 它可以工作,它会重定向到saved.jsp
文件。 之前,我使用@RequestParam String name, @RequestParam String surname etc
来从HTML表单中捕获数据。 有没有解决方案从Spring表单“捕获”数据作为DTO对象? 如果abyody决定帮助我,我会很高兴 - 谢谢你提前。
使用@RequestBody将所有正文内容(例如:JSON)映射到DTO对象。 使用@ModelAttribute将所有表单发布参数映射到DTO对象。
您可以尝试使用@ModelAttribute
( 在SO中访问ModelAttribute问题以便清楚地了解它)
@RequestMapping(value = "/save", method = RequestMethod.POST)
public String save(@ModelAttribute("employeeDTO") EmployeeDTO employeeDTO){
return "saved";
}
我in spring mvc 3.1
使用过它
如前面的答案中所述,@ ModelAttirube是修复的一部分,但是, 要使值实际绑定到模型属性,您必须在表单上添加名称属性,如下所示
<form:form action="save" name="employeeDTO" method="POST">
<label for="name">Name</label><input id="name" name="name" type="text" required><br>
<label for="surname">Surname</label><input id="surname" name="surname" type="text" required><br>
<label for="email">E-mail</label><input id="email" type="email" name="email" required><br>
<label for="salary">Salary</label><input id="salary" type="number" name="salary" required><br>
<input type="submit" value="Save">
</form:form>
使用@ModelAttribute将DTO(以Spring形式)绑定到Controller方法的参数。
http://docs.spring.io/spring/docs/3.0.x/spring-framework-reference/html/mvc.html#mvc-ann-modelattrib
希望这有帮助。
如果您正在使用spring MVC,那么请确保您的控制器中的“ModelAndView”具有“@RequestMapping”。 并在jsp页面中检查你的ajax调用synatax。 这个网址可以帮助你
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