验证后重新提交表单的问题

Question

I am trying to learn Spring MVC with small application but got stuck with an issue.

I have created a form for user registration, now on form submission I am doing validation using annotations.

When the validation fails, I am re-displaying the form with error details. But when I re-submit the form, I am facing issue with how to handle the URL mapping.

Here is my controller code:

@Controller
public class PersonController {

    private PersonService personService;

    public PersonService getPersonService() {
        return personService;
    }

    @Autowired
    public void setPersonService(PersonService personService) {
        this.personService = personService;
    }

    @RequestMapping("/allpersons")
    public String showPersonListPage(Map<String, Object> model) {
        model.put("persons", getPersonService().fetchAllPersons());
        return "person_list";
    }

    @RequestMapping(value = "/person", method = GET)
    public String showNewPersonForm(Map<String, Object> model) {
        model.put("person", new Person());
        return "new_person";
    } 

    @RequestMapping(value = "/person/add", method = RequestMethod.POST)
    public String addPersonFromForm(@Valid Person person,
            BindingResult bindingResult) {
        if (bindingResult.hasErrors()) {
            return "new_person";
        }
        getPersonService().addPerson(person);
        return "redirect:/allpersons";
    }

}   

Initially I am trying to display the form using the URL as http://localhost:8080/myapp/person . The code for my form is like this:

new_person.jsp

<div>
    <h2>New Person Form</h2>

    <sf:form method="POST" modelAttribute="person"
        action="person/add">
        <fieldset>
            <table cellspacing="0">
                <tr>
                    <th><label for="name">Name:</label></th>
                    <td><sf:input path="name" id="name" /></td>
                    <td><sf:errors path="name" /></td>
                </tr>
                <tr>
                    <th><label for="age">Age:</label></th>
                    <td><sf:input path="age" id="age" /></td>
                    <td><sf:errors path="age" /></td>
                </tr>
                <tr>
                    <th><input type="Submit" value="Submit" /></th>
                    <td></td>
                </tr>
            </table>
        </fieldset>
    </sf:form>

</div>

Now on form submission the URL pattern for my form is person/add so the URL is changing to http://localhost:8080/myapp/person/add . Initially I am submitting the form with wrong information so the form is re-loaded with validation error messages.

Now when I re-submit the form with correct values, the URL is going to http://localhost:8080/myapp/person/person/add instead of http://localhost:8080/myapp/person/add .

Can someone please help me how to fix this basic issue?

Let me know if you need any more details.

Here is my spring configuration file.

adding only main entries of the file:

<mvc:annotation-driven validator="validator" />
    <context:component-scan
        base-package="com.examples" />

    <bean id="validator"
        class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean" />

    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix">
            <value>/WEB-INF/views/</value>
        </property>
        <property name="suffix" value=".jsp" />
    </bean>

The PersonService (has @Service annotation) & Person are simple classes

Answer 1

Maintain a single URL pattern for GET as well as POST .

So in your controller on form submission the handler should be like this:

@RequestMapping(value = "/person", method = RequestMethod.POST)
public String addPersonFromForm(@Valid Person person,
        BindingResult bindingResult) {
        ... // your code
}

In above code I have changed the URL pattern.

Now coming to your JSP, remove the action attribute to avoid the URL mismatch.

Making these 2 changes will fix the issue.

Answer 2

I see no "form2" reference anywhere. Maybe you missed something at your question? Or just a mistake writing?

Also, as an advice, I suggest you use the same URL using GET and POST methods, as it's a good practice.