Can spring mvc trim all strings obtained from forms?

Using Spring 3.2 or greater:

@ControllerAdvice
public class ControllerSetup
{
    @InitBinder
    public void initBinder ( WebDataBinder binder )
    {
        StringTrimmerEditor stringtrimmer = new StringTrimmerEditor(true);
        binder.registerCustomEditor(String.class, stringtrimmer);
    }
}

Testing with an MVC test context:

@RunWith(SpringJUnit4ClassRunner.class)
@WebAppConfiguration
@ContextConfiguration
public class ControllerSetupTest
{
    @Autowired
    private WebApplicationContext   wac;
    private MockMvc                 mockMvc;

    @Before
    public void setup ( )
    {
        this.mockMvc = MockMvcBuilders.webAppContextSetup(this.wac).build();
    }

    @Test
    public void stringFormatting ( ) throws Exception
    {
        MockHttpServletRequestBuilder post = post("/test");
        // this should be trimmed, but only start and end of string
        post.param("test", "     Hallo  Welt   ");
        ResultActions result = mockMvc.perform(post);
        result.andExpect(view().name("Hallo  Welt"));
    }

    @Configuration
    @EnableWebMvc
    static class Config
    {
        @Bean
        TestController testController ( )
        {
            return new TestController();
        }

        @Bean
        ControllerSetup controllerSetup ( )
        {
            return new ControllerSetup();
        }
    }
}

/**
 * we are testing trimming of strings with it.
 * 
 * @author janning
 * 
 */
@Controller
class TestController
{
    @RequestMapping("/test")
    public String test ( String test )
    {
        return test;
    }
}

And - as asked by LppEdd - it works with passwords too as on the server side there is no difference between input[type=password] and input[type=text]

register this property editor: org.springframework.beans.propertyeditors.StringTrimmerEditor

Example for AnnotionHandlerAdapter:

<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
  ...
  <property name="webBindingInitializer">
    <bean class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">
      <property name="propertyEditorRegistrar">
         <bean class="org.springframework.beans.propertyeditors.StringTrimmerEditor" />
      </property>
    </bean>
  </property>
  ...
</bean>