如何使用 thymeleaf 和 bean 验证进行验证？

Question

我试图在我的视图中执行一个简单的验证，我知道jsf很简单，在spring mvc中做更多让我很头疼...... 谁能帮我做这个验证？看看我做错了什么??

我的模型

package br.com.nextinfo.multimedia.web.model;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;

import org.hibernate.validator.constraints.NotBlank;

@Table
@Entity(name="slideshow")
public class SlideShow {

private Long condigo;

private String titulo;

private String subTitulo;

private ImagemSlider imagemSlider;


@Id 
@GeneratedValue(generator="codigo",strategy=GenerationType.AUTO) 
@SequenceGenerator(name = "codigo", sequenceName = "codigo_slideshow")    
@Column(name = "CODIGO")
public Long getCondigo() {
    return condigo;
}

@NotNull
@NotBlank
@Column(name = "TITULO" ,nullable = false)
public String getTitulo() {
    return titulo;
}
@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name ="CODIGO_IMAGEM")
public ImagemSlider getImagemSlider() {
    return imagemSlider;
}

@NotNull
@NotBlank
@Column(name = "SUBTITULO" ,nullable = false)
public String getSubTitulo() {
    return subTitulo;
}

public void setTitulo(String titulo) {
    this.titulo = titulo;
}

public void setSubTitulo(String subTitulo) {
    this.subTitulo = subTitulo;
}


public void setImagemSlider(ImagemSlider imagemSlider) {
    this.imagemSlider = imagemSlider;
}

public void setCondigo(Long condigo) {
    this.condigo = condigo;
}


}

我的控制器

package br.com.nextinfo.multimedia.web.controller;


import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import br.com.nextinfo.multimedia.web.model.ImagemSlider;
import br.com.nextinfo.multimedia.web.model.SlideShow;
import br.com.nextinfo.multimedia.web.services.AbstractFactoryService;
import br.com.nextinfo.multimedia.web.services.CreateSlideShowService;
import br.com.nextinfo.multimedia.web.services.ImagemServiceDatabase;

@Controller
@RequestMapping("/arquivosbanco/")
public class FilesDatabaseController  implements AbstractControllerApp    ,PadraoCrudMetodos<ImagemSlider> {

@Autowired
private ImagemServiceDatabase imagemService;

@Autowired
private CreateSlideShowService slideShowService;

@Override
public String getRequisicaoPadrao(Model model) {
    List<ImagemSlider> lista = this.getAbstractService().realizaPaginacao("0", "10" ,null).getContent();
    model.addAttribute("listaObjetoPageStart", lista);
    model.addAttribute("img", new ImagemSlider());
    return this.getUrlInicial();
}

@Override
public String getUrlInicial() {
    return "arquivos/database/listarquivosbancodedados";
}

@ResponseBody
@RequestMapping(value = "/img", method = RequestMethod.GET)
public void showImage(@RequestParam("id") Long id, HttpServletResponse response,HttpServletRequest request)  throws ServletException, IOException {
    response.setContentType("image/jpeg, image/jpg, image/png, image/gif");
    ImagemSlider imgdatabase =  imagemService.getAbstractService().getBean(id);
    if (imgdatabase!=null ) {
        response.getOutputStream().write(imgdatabase.getImage());
        response.getOutputStream().close();
    }
}

@Override
public AbstractFactoryService<ImagemSlider> getAbstractService() {
    return imagemService;
}
@RequestMapping(value = "/createslideshow/{imagemid}" ,method=RequestMethod.GET)
public String createslider(@PathVariable("imagemid") Long image,Model model){
    final ImagemSlider img  = this.imagemService.getBean(image);
    model.addAttribute("imgslider", img);
    model.addAttribute("slideshow", new SlideShow());

    return "arquivos/createdisplay";
}
@RequestMapping(value = "/save" ,method=RequestMethod.POST)
public String saveSlideShowr( @RequestParam Long imagemid ,@Valid  final SlideShow slideshow,final BindingResult result ,RedirectAttributes redirectAttrs){

    ImagemSlider img  = this.imagemService.getBean(imagemid);
    if (result.hasErrors()) {
        redirectAttrs.addFlashAttribute("org.springframework.validation.BindingResult.strategy", result);
        redirectAttrs.addFlashAttribute("slideshow", slideshow);
        return "redirect:/arquivosbanco/createslideshow/"+imagemid;
    }else{
        this.slideShowService.salva(slideshow);
        if (img != null) {
            slideshow.setImagemSlider(img);
            this.slideShowService.salva(slideshow);
        }
    }
    return this.getUrlInicial();
    }
  }

   <html xmlns:th="http://www.thymeleaf.org"
    xmlns:layout="http://www.ultraq.net.nz/thymeleaf/layout"
    layout:decorator="/templates/layouts/principal">
    <head>
     <title>Criacao slideshow</title>
  </head>
 <body>

<div class="container-fluid" layout:fragment="corpopagina">
    <h3 class="page-header text-center">Criacao slide show</h3>

<form id="registration-form" class="form-horizontal"  th:object="${slideShow}" th:action="@{/arquivosbanco/save/?imagemid=}+${imgslider.codigo}"  method="post">

 <!-- Print all errors here!-->
<div class="col-md-4 col-xs-12">
    <div class="thumbnail">
        <img class="img-responsive" th:attr="src=@{'/upload/img?codigo='+${imgslider.codigo}}" width="400" height="400" />
        <span  class="text-center"></span>
        </div>  
        <div class="caption">
            <h5>Codigo <span th:text="${imgslider.codigo}" class="badge" style="margin-left:20px">5</span></h5>
            <h5>Nome <span th:text="${imgslider.nome}" class="badge" style="margin-left:20px">5</span></h5>
        </div>
    </div>
    <div class="col-md-8 col-xs-12">
            <div class="form-group">
                <label class="col-xs-3 control-label">Titulo principal</label>
                <div class="col-md-8">
                    <input type="text" class="form-control" name="titulo"  /> 
                </div>
            </div>
            <div class="form-group">
                <label class="col-xs-3 control-label">Sub titulo</label>
                <div class="col-md-8">
                    <input type="text" class="form-control input-xs" name="subTitulo" />
                </div>
            </div>
            <div class="form-actions">
                <label class="col-md-3 control-label"></label>
                <div class="col-md-7">
                <button type="submit" class="btn btn-success btn-large">Salvar</button>
                </div>
                <div class="col-md-1"></div>
            </div>
        </div>
    </form>
</div>
</body>

在我的控制器中通常正在验证更多在视图中没有显示任何内容我该如何解决？

我在Whosebug上花了不少时间，大部分都找不到解决方案...

Answer 1

您的视图没有显示任何内容，因为您没有在模板中包含错误消息。下面是一个例子。

 <td th:if="${#fields.hasErrors('age')}" th:errors="*{age}">Name Error</td>

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