Java 具有两个对象的Spring表单验证

Spring Boot应用程序出现了一个复杂的问题，我已经尝试解决了一段时间了，我希望有人能帮助我。我已经删除了项目的所有其他部分，并试图使其尽可能简单。如果您转到localhost:8080，将有一个表单，其中有两个文本框，可以输入两个名称，还有一个提交按钮。第一个名称将存储在被提名者对象中，第二个名称存储在提交者对象中。单击“提交”时，它将对字段执行验证，以确保它们都不是空的。我将在下面发布代码，并在最后解释我的问题

Application.java

@SpringBootApplication
@EnableJms
@EnableWebMvc
public class Application {

    public static void main(String[] args) throws Exception {
        // Launch the application
        SpringApplication.run(Application.class, args);
    }
}

@Controller
public class WebController extends WebMvcConfigurerAdapter {
    protected static final Logger LOG = LoggerFactory.getLogger(WebController.class);

    @InitBinder("nominee")
    protected void initNomineeBinder(WebDataBinder binder) {
        binder.setValidator(new NomineeValidator());
    }

    @InitBinder("submitter")
    protected void initSubmitterBinder(WebDataBinder binder) {
        binder.setValidator(new SubmitterValidator());
    }

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/success").setViewName("success");
    }

    @RequestMapping(value="/", method=RequestMethod.GET)
    public String showForm(Model model) {
        model.addAttribute("nominee", new Nominee());
        model.addAttribute("submitter", new Submitter());
        return "form";
    }

    @RequestMapping(value="/", method=RequestMethod.POST)
    public String checkPersonInfo(@ModelAttribute(value="nominee") @Valid Nominee nominee,
                                  @ModelAttribute(value="submitter") @Valid Submitter submitter,
                                  BindingResult bindingResult, @Valid Model model) {
        LOG.info("Nominee to string: " + nominee.toString());
        LOG.info("Submitter to string: " + submitter.toString());
        LOG.info("bindingResult to string: " + bindingResult.toString());
        if (bindingResult.hasErrors()) {
            return "form";
        }

        return "redirect:/success";
    }
}

import lombok.Data;

@Data
public class Nominee {
    private String name;
}

public class NomineeValidator implements Validator {

    public boolean supports(Class clazz) {
        return Nominee.class.equals(clazz);
    }

    public void validate(Object object, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors, "name", "name", "This field is empty.");
    }
}

import lombok.Data;

@Data
public class Submitter {
    private String sname;
}

public class SubmitterValidator implements Validator {

    public boolean supports(Class clazz) {
        return Submitter.class.equals(clazz);
    }

    public void validate(Object object, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors, "sname", "sname", "This field is empty.");
    }
}

WebController.java

@SpringBootApplication
@EnableJms
@EnableWebMvc
public class Application {

    public static void main(String[] args) throws Exception {
        // Launch the application
        SpringApplication.run(Application.class, args);
    }
}

@Controller
public class WebController extends WebMvcConfigurerAdapter {
    protected static final Logger LOG = LoggerFactory.getLogger(WebController.class);

    @InitBinder("nominee")
    protected void initNomineeBinder(WebDataBinder binder) {
        binder.setValidator(new NomineeValidator());
    }

    @InitBinder("submitter")
    protected void initSubmitterBinder(WebDataBinder binder) {
        binder.setValidator(new SubmitterValidator());
    }

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/success").setViewName("success");
    }

    @RequestMapping(value="/", method=RequestMethod.GET)
    public String showForm(Model model) {
        model.addAttribute("nominee", new Nominee());
        model.addAttribute("submitter", new Submitter());
        return "form";
    }

    @RequestMapping(value="/", method=RequestMethod.POST)
    public String checkPersonInfo(@ModelAttribute(value="nominee") @Valid Nominee nominee,
                                  @ModelAttribute(value="submitter") @Valid Submitter submitter,
                                  BindingResult bindingResult, @Valid Model model) {
        LOG.info("Nominee to string: " + nominee.toString());
        LOG.info("Submitter to string: " + submitter.toString());
        LOG.info("bindingResult to string: " + bindingResult.toString());
        if (bindingResult.hasErrors()) {
            return "form";
        }

        return "redirect:/success";
    }
}

import lombok.Data;

@Data
public class Nominee {
    private String name;
}

public class NomineeValidator implements Validator {

    public boolean supports(Class clazz) {
        return Nominee.class.equals(clazz);
    }

    public void validate(Object object, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors, "name", "name", "This field is empty.");
    }
}

import lombok.Data;

@Data
public class Submitter {
    private String sname;
}

public class SubmitterValidator implements Validator {

    public boolean supports(Class clazz) {
        return Submitter.class.equals(clazz);
    }

    public void validate(Object object, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors, "sname", "sname", "This field is empty.");
    }
}

namedee.java

@SpringBootApplication
@EnableJms
@EnableWebMvc
public class Application {

    public static void main(String[] args) throws Exception {
        // Launch the application
        SpringApplication.run(Application.class, args);
    }
}

@Controller
public class WebController extends WebMvcConfigurerAdapter {
    protected static final Logger LOG = LoggerFactory.getLogger(WebController.class);

    @InitBinder("nominee")
    protected void initNomineeBinder(WebDataBinder binder) {
        binder.setValidator(new NomineeValidator());
    }

    @InitBinder("submitter")
    protected void initSubmitterBinder(WebDataBinder binder) {
        binder.setValidator(new SubmitterValidator());
    }

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/success").setViewName("success");
    }

    @RequestMapping(value="/", method=RequestMethod.GET)
    public String showForm(Model model) {
        model.addAttribute("nominee", new Nominee());
        model.addAttribute("submitter", new Submitter());
        return "form";
    }

    @RequestMapping(value="/", method=RequestMethod.POST)
    public String checkPersonInfo(@ModelAttribute(value="nominee") @Valid Nominee nominee,
                                  @ModelAttribute(value="submitter") @Valid Submitter submitter,
                                  BindingResult bindingResult, @Valid Model model) {
        LOG.info("Nominee to string: " + nominee.toString());
        LOG.info("Submitter to string: " + submitter.toString());
        LOG.info("bindingResult to string: " + bindingResult.toString());
        if (bindingResult.hasErrors()) {
            return "form";
        }

        return "redirect:/success";
    }
}

import lombok.Data;

@Data
public class Nominee {
    private String name;
}

public class NomineeValidator implements Validator {

    public boolean supports(Class clazz) {
        return Nominee.class.equals(clazz);
    }

    public void validate(Object object, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors, "name", "name", "This field is empty.");
    }
}

import lombok.Data;

@Data
public class Submitter {
    private String sname;
}

public class SubmitterValidator implements Validator {

    public boolean supports(Class clazz) {
        return Submitter.class.equals(clazz);
    }

    public void validate(Object object, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors, "sname", "sname", "This field is empty.");
    }
}

ior.java

@SpringBootApplication
@EnableJms
@EnableWebMvc
public class Application {

    public static void main(String[] args) throws Exception {
        // Launch the application
        SpringApplication.run(Application.class, args);
    }
}

@Controller
public class WebController extends WebMvcConfigurerAdapter {
    protected static final Logger LOG = LoggerFactory.getLogger(WebController.class);

    @InitBinder("nominee")
    protected void initNomineeBinder(WebDataBinder binder) {
        binder.setValidator(new NomineeValidator());
    }

    @InitBinder("submitter")
    protected void initSubmitterBinder(WebDataBinder binder) {
        binder.setValidator(new SubmitterValidator());
    }

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/success").setViewName("success");
    }

    @RequestMapping(value="/", method=RequestMethod.GET)
    public String showForm(Model model) {
        model.addAttribute("nominee", new Nominee());
        model.addAttribute("submitter", new Submitter());
        return "form";
    }

    @RequestMapping(value="/", method=RequestMethod.POST)
    public String checkPersonInfo(@ModelAttribute(value="nominee") @Valid Nominee nominee,
                                  @ModelAttribute(value="submitter") @Valid Submitter submitter,
                                  BindingResult bindingResult, @Valid Model model) {
        LOG.info("Nominee to string: " + nominee.toString());
        LOG.info("Submitter to string: " + submitter.toString());
        LOG.info("bindingResult to string: " + bindingResult.toString());
        if (bindingResult.hasErrors()) {
            return "form";
        }

        return "redirect:/success";
    }
}

import lombok.Data;

@Data
public class Nominee {
    private String name;
}

public class NomineeValidator implements Validator {

    public boolean supports(Class clazz) {
        return Nominee.class.equals(clazz);
    }

    public void validate(Object object, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors, "name", "name", "This field is empty.");
    }
}

import lombok.Data;

@Data
public class Submitter {
    private String sname;
}

public class SubmitterValidator implements Validator {

    public boolean supports(Class clazz) {
        return Submitter.class.equals(clazz);
    }

    public void validate(Object object, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors, "sname", "sname", "This field is empty.");
    }
}

Submitter.java

@SpringBootApplication
@EnableJms
@EnableWebMvc
public class Application {

    public static void main(String[] args) throws Exception {
        // Launch the application
        SpringApplication.run(Application.class, args);
    }
}

@Controller
public class WebController extends WebMvcConfigurerAdapter {
    protected static final Logger LOG = LoggerFactory.getLogger(WebController.class);

    @InitBinder("nominee")
    protected void initNomineeBinder(WebDataBinder binder) {
        binder.setValidator(new NomineeValidator());
    }

    @InitBinder("submitter")
    protected void initSubmitterBinder(WebDataBinder binder) {
        binder.setValidator(new SubmitterValidator());
    }

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/success").setViewName("success");
    }

    @RequestMapping(value="/", method=RequestMethod.GET)
    public String showForm(Model model) {
        model.addAttribute("nominee", new Nominee());
        model.addAttribute("submitter", new Submitter());
        return "form";
    }

    @RequestMapping(value="/", method=RequestMethod.POST)
    public String checkPersonInfo(@ModelAttribute(value="nominee") @Valid Nominee nominee,
                                  @ModelAttribute(value="submitter") @Valid Submitter submitter,
                                  BindingResult bindingResult, @Valid Model model) {
        LOG.info("Nominee to string: " + nominee.toString());
        LOG.info("Submitter to string: " + submitter.toString());
        LOG.info("bindingResult to string: " + bindingResult.toString());
        if (bindingResult.hasErrors()) {
            return "form";
        }

        return "redirect:/success";
    }
}

import lombok.Data;

@Data
public class Nominee {
    private String name;
}

public class NomineeValidator implements Validator {

    public boolean supports(Class clazz) {
        return Nominee.class.equals(clazz);
    }

    public void validate(Object object, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors, "name", "name", "This field is empty.");
    }
}

import lombok.Data;

@Data
public class Submitter {
    private String sname;
}

public class SubmitterValidator implements Validator {

    public boolean supports(Class clazz) {
        return Submitter.class.equals(clazz);
    }

    public void validate(Object object, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors, "sname", "sname", "This field is empty.");
    }
}

SubmitterValidator.java

@SpringBootApplication
@EnableJms
@EnableWebMvc
public class Application {

    public static void main(String[] args) throws Exception {
        // Launch the application
        SpringApplication.run(Application.class, args);
    }
}

@Controller
public class WebController extends WebMvcConfigurerAdapter {
    protected static final Logger LOG = LoggerFactory.getLogger(WebController.class);

    @InitBinder("nominee")
    protected void initNomineeBinder(WebDataBinder binder) {
        binder.setValidator(new NomineeValidator());
    }

    @InitBinder("submitter")
    protected void initSubmitterBinder(WebDataBinder binder) {
        binder.setValidator(new SubmitterValidator());
    }

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/success").setViewName("success");
    }

    @RequestMapping(value="/", method=RequestMethod.GET)
    public String showForm(Model model) {
        model.addAttribute("nominee", new Nominee());
        model.addAttribute("submitter", new Submitter());
        return "form";
    }

    @RequestMapping(value="/", method=RequestMethod.POST)
    public String checkPersonInfo(@ModelAttribute(value="nominee") @Valid Nominee nominee,
                                  @ModelAttribute(value="submitter") @Valid Submitter submitter,
                                  BindingResult bindingResult, @Valid Model model) {
        LOG.info("Nominee to string: " + nominee.toString());
        LOG.info("Submitter to string: " + submitter.toString());
        LOG.info("bindingResult to string: " + bindingResult.toString());
        if (bindingResult.hasErrors()) {
            return "form";
        }

        return "redirect:/success";
    }
}

import lombok.Data;

@Data
public class Nominee {
    private String name;
}

public class NomineeValidator implements Validator {

    public boolean supports(Class clazz) {
        return Nominee.class.equals(clazz);
    }

    public void validate(Object object, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors, "name", "name", "This field is empty.");
    }
}

import lombok.Data;

@Data
public class Submitter {
    private String sname;
}

public class SubmitterValidator implements Validator {

    public boolean supports(Class clazz) {
        return Submitter.class.equals(clazz);
    }

    public void validate(Object object, Errors errors) {
        ValidationUtils.rejectIfEmpty(errors, "sname", "sname", "This field is empty.");
    }
}

form.html

提名人详情
姓名：
空字段
你的细节
你的名字：
空字段
提交提名

通常的情况是在这种情况下使用Dto对象。这意味着您创建了一个包含所有相关表单字段的对象，并基于此进行验证

例如：

@Data
public class MyDto {

    private Nominee nominee;

    private Submitter submitter;
}

@RequestMapping(value="/", method=RequestMethod.POST)
public String checkPersonInfo(@Valid MyDto dto, BindingResult bindingResult) {
    LOG.info("Nominee to string: " + dto.getNominee().toString());
    LOG.info("Submitter to string: " + dto.getSubmitter().toString());
    LOG.info("bindingResult to string: " + bindingResult.toString());
    if (bindingResult.hasErrors()) {
        return "form";
    }
    return "redirect:/success";
}

此外，您还可以向控制器添加类似的内容

@ExceptionHandler(Throwable.class)
public ModelAndView processError(Throwable ex) {
    ex.toString();
    // do something and return a ModelAndView object as you like.
}

---

找到了解决办法。在WebController中，checkPersonInfo需要为每个正在验证的对象提供单独的BindingResult。BindingResult需要位于紧跟在每个@Valid对象之后的方法参数中

因此，在WebController.java中：

    @RequestMapping(value="/", method=RequestMethod.POST)
public String checkPersonInfo(@ModelAttribute(value="nominee") @Valid Nominee nominee,
                              @ModelAttribute(value="submitter") @Valid Submitter submitter,
                              BindingResult bindingResult, @Valid Model model) {
    LOG.info("Nominee to string: " + nominee.toString());
    LOG.info("Submitter to string: " + submitter.toString());
    LOG.info("bindingResult to string: " + bindingResult.toString());
    if (bindingResult.hasErrors()) {
        return "form";
    }

    return "redirect:/success";
}

需要做到这一点：

    @RequestMapping(value="/", method=RequestMethod.POST)
public String checkPersonInfo(@ModelAttribute(value="nominee") @Valid Nominee nominee,
                              BindingResult bindingResultNominee,
                              @ModelAttribute(value="submitter") @Valid Submitter submitter,
                              BindingResult bindingResultSubmitter) {
    LOG.info("Nominee to string: " + nominee.toString());
    LOG.info("Submitter to string: " + submitter.toString());
    if (bindingResultNominee.hasErrors() || bindingResultSubmitter.hasErrors()) {
        return "form";
    }

    return "redirect:/success";
}

---

（模型对象已被删除，因为它从未在任何地方实际使用过，如果需要使用@Valid对其进行验证，则需要添加第三个BindingResult对象。）

试着打开

org.springframework.web

的日志，以调试控制台是否有什么有趣的内容。只是想知道。你为什么要进行服务器端验证而不是客户端验证（基于javascript），这没有真正的原因。第一次使用Spring Boot，只是玩它来教自己它是如何工作的，看到它有自己的表单验证实现，就想尝试让它工作。此外，要在

提名者

和

提交者

中使用来自

javax.validation

的验证，必须向每个属性添加

@Valid

。否则会引发ValidationException，但不会由任何

@Valid

-注释处理。