Bean名称“ cliente”的BindingResult或普通目标对象都不能用作请求属性

时间:2018-12-27 13:56:50

标签: spring thymeleaf

我遇到了spring和thymeleaf的问题,我试图用来自名为cliente的实体的数据填充表单,但是我在浏览器中收到Whitelabel Error Page消息,而在控制台中得到此消息< / p>

Neither BindingResult nor plain target object for bean name 'cliente' available as request attribute

这是客户

package com.bolsadeideasspringboot.app.models.entity;
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.validation.constraints.Email;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.NotNull;
import org.springframework.format.annotation.DateTimeFormat;

@Entity
@Table(name="clientes")
public class Cliente implements Serializable{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    @NotEmpty
    private String nombre;
    @NotEmpty
    private String apellido;
    @NotEmpty
    @Email
    private String email;
    @Column(name="create_at")
    @Temporal(TemporalType.DATE)
    @DateTimeFormat(pattern="dd/MM/yyyy")
    private Date createAt;


    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getNombre() {
        return nombre;
    }
    public void setNombre(String nombre) {
        this.nombre = nombre;
    }
    public String getApellido() {
        return apellido;
    }
    public void setApellido(String apellido) {
        this.apellido = apellido;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    public Date getCreateAt() {
        return createAt;
    }
    public void setCreateAt(Date createAt) {
        this.createAt = createAt;
    }

}

这是控制器方法

@RequestMapping(value="/form/{id}")
    public String editar(@ModelAttribute("form") @PathVariable(value="id")Long id, Map<String, Object>model) {
    Cliente cliente = null;

    if(id > 0) {
        clientedao.findOne(id);
        model.put("cliente", cliente);
        model.put("titulo", "Editar Cliente");
        return "form";
    }
    else {
        return "redirect:/listar";
    }

}

这是ClienteDaoImpl.java方法

@Override
public Cliente findOne(Long id) {
    // TODO Auto-generated method stub
    return em.find(Cliente.class, id);
}

这是Dao接口方法

public Cliente findOne(Long id);

这是表格

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8" />
    <title th:text="${titulo}">Insert title here</title>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

</head>
<body>

    <div class="container">

        <div class="row">
            <div class="col-md-4 col-md-offset-3">
                <h1 class="text-success" th:text="${titulo}"></h1>
                <form th:action="@{/form}" th:object="${cliente}" method="post">

                    <div class="form-group">
                        <label>Nombre</label>
                        <input class="form-control" type="text" th:field="*{nombre}" placeholder="Nombre"/>
                        <small class="form-text text-danger" th:if="${#fields.hasErrors('nombre')}" th:errors="*{nombre}"></small>
                    </div>

                    <div class="form-group">    
                        <label>Apellido</label>
                        <input class="form-control" type="text" th:field="*{apellido}" placeholder="Apellido"/>
                        <small class="form-text text-danger" th:if="${#fields.hasErrors('apellido')}" th:errors="*{apellido}"></small>
                    </div>
                    <div class="form-group">    
                        <label>Email</label>
                        <input class="form-control" type="text" th:field="*{email}" placeholder="correo@ejemplo.com"/>
                        <small class="form-text text-danger" th:if="${#fields.hasErrors('email')}" th:errors="*{email}"></small>
                    </div>
                    <div class="form-group">    
                        <label>Fecha</label>
                        <input class="form-control" type="text" th:field="*{createAt}" placeholder="DD/MM/YYYY"/>
                        <small class="form-text text-danger" th:if="${#fields.hasErrors('createAt')}" th:errors="*{createAt}"></small>
                    </div>  
                    <div class="form-group">    
                        <input class="btn btn-primary" type="submit" value="Crear Cliente" />
                    </div>

                    <input type="hidden" th:field="*{id}" />
                </form>
            </div>
        </div>
    </div>

</body>
</html>

我正在控制器方法中设置cliente,并且正在使用表单中的th:object,所以我不知道自己在做什么错,任何帮助都是有帮助的,谢谢您的建议

1 个答案:

答案 0 :(得分:1)

尝试使用推荐的方法,而不是put(),将对象添加到模型中

model.addAttribute("cliente", clientedao.findOne(id));

您通常还希望使用@GetMapping来填充表格。并使用@PostMapping进行提交。

此外:还请看一下Lombok项目,以使您的bean更少出错,更易读。您可以删除所有这些getter和setter并仅用@Data注释类。

虽然不建议您弃用,但您也要远离使用java.util.Date,而使用较新的日期/时间类。