如何将session属性传递给ThymeLeaf表单字段以保存到数据库中

Question

我有一个Thymeleaf表单，当用户登录时，它会将数据发送到数据库表。ThymeLeaf模板能够从其分配的控制器捕获登录用户的会话。将数据保存到数据库时。

我需要将表单数据与捕获的会话用户名一起提供，以便所述会话用户名也保存在数据库表中。但是我得到一个错误

组织。springframework。豆。NotReadablePropertyException:bean类[com.example.jobonics.Persistence.model.NewJobs]的无效属性“userName”：bean属性“userName”不可读或具有无效的getter方法：getter的返回类型是否与setter的参数类型匹配？

我有一个控制器，它可以选择用户会话并将其发送到thymeleaf模板，还有一个隐藏的输入用户字段，它保存来自控制器的会话对象。为了清晰起见，我的代码粘贴在下面：

@RequestMapping(value = "/new_job", method = RequestMethod.GET)
public String newRegistration(ModelMap model) {
    NewJobs newJobs = new NewJobs();
    Authentication auth = SecurityContextHolder.getContext().getAuthentication();
    ServletRequestAttributes attr = (ServletRequestAttributes)
    RequestContextHolder.currentRequestAttributes();

   //extract user session from HttpSession
    HttpSession session = attr.getRequest().getSession(true);
    //initialize user service to get authenticated user
    User user = userService.findUserByEmail(auth.getName());

    model.addAttribute("newjobs", newJobs);
    //add session captured name as attribute to view
    model.addAttribute("userName", "Welcome " + user.getFullName() + "");
    return "new_job";

@RequestMapping(value = "/save", method = RequestMethod.POST)
public String saveRegistration(@Valid NewJobs newJobs, BindingResult result, 
ModelMap model,
        RedirectAttributes redirectAttributes) {
    if (result.hasErrors()) {
     System.out.println("has errors");
        return "new_job";
    }

    NJS.save(newJobs);


    return "redirect:/new_job";
}
}

我的控制器

<form class="form-horizontal" th:action="@{/save}" th:object="${newjobs}" method="post">

<div class="form-group">
    <div class="col-sm-7">
        <input type="text" class="form-control" th:value="*{userName}" style="display:none">
    </div>
</div>

新工作

@Entity
@Table(name = "newjobs")
public class NewJobs {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "id")
private int job_id;

@Column(name = "Employer")
private String Employer;

@Column(name = "JobTitle")
@NotEmpty(message = "Please provide the job title")
private String jobTitle;

@Column(name = "job_summary", length = 1000)
private String jobSummary;

@Column(name = "job_description", length = 1000)
private String jobDescription;

@Column(name = "location")
private String Location;

@Column(name = "career_level")
@NotEmpty(message = "Please provide career level required")
private String careerLevel;

@Column(name = "industry")
private String industry;

@Column(name = "profession")
@NotEmpty(message = "Please provide the profession")
private String profession;

@Column(name = "jobtype")
@NotEmpty(message = "Please provide your job type")

private String jobType;
@Column(name = "min_experience")
@NotEmpty(message = "Please provide the Min years of experience")

private String minExperience;
@Column(name = "min_qualification")
@NotEmpty(message = "Please provide the Min Qualifications")
private String minQualification;

@Column(name = "salary")
@NotEmpty(message = "Please provide the salary")
private String salary;

@Column(name = "deadline_date")
@NotEmpty(message = "Please provide the Applications Deadline")
private String deadlineDate;

@Column(name = "created_at", columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP", insertable = false, nullable = false)
private Date created_at;
}`

我的预期输出是将登录的用户会话对象作为提交表单的一部分发送到db。我可以做些什么来纠正上述错误？

Answer 1

我认为错误在于你的用户名来自错误的位置：
th:value=“*{username}”meannewjobs。用户名
但在控制器中，您没有将用户名设置为新作业，而是设置为模型属性

让我们在控制器中更改代码（使用额外的getter）
newjobs。setUserName（“欢迎”user.getFullName（））

或者
th:value=“${userName}”（$但不是*）

注：
https://www.thymeleaf.org/doc/tutorials/3.0/usingthymeleaf.html#expressions-关于星号语法

不过有一个重要的区别：星号语法计算选定对象上的表达式，而不是整个上下文上的表达式。也就是说，只要没有选定的对象，美元和星号语法就完全相同。