[springmvc] Validation

Trigger validation by marking a JavaBean parameter as @Valid

　　The JavaBean will be passed to a Validator for validation

　　The JavaBean will be passed to a Validator for validation

Binding and validation errors can be trapped and introspected by declaring a BindingResult parameter

　　Must follow the JavaBean parameter in the method signature

　　Errors automatically exported in the model when rendering views

　　Not supported with other request parameter types (@RequestBody, etc)

    @RequestMapping("/validate")
    public @ResponseBody String validate(@Valid JavaBean bean, BindingResult result) {
        if (result.hasErrors()) {
            return "Object has validation errors";
        } else {
            return "No errors";
        }
    }

JavaBean.java

import java.util.Date;

import javax.validation.constraints.Future;
import javax.validation.constraints.Max;
import javax.validation.constraints.NotNull;

import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.format.annotation.DateTimeFormat.ISO;

public class JavaBean {
    
    @NotNull
    @Max(5)
    private Integer number;

    @NotNull
    @Future
    @DateTimeFormat(iso=ISO.DATE)
    private Date date;

    public Integer getNumber() {
        return number;
    }

    public void setNumber(Integer number) {
        this.number = number;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

}