直接使用 Spring Modules Annotation Validation

Spring Modules
Annotation-Based Validation with the Spring Bean Validation Framework

// -- Slave.java --
import org.springmodules.validation.bean.conf.loader.annotation.handler.NotNull;

public class Slave {

  @NotNull(message = "Not Null")
  private String name;

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }
  
}

// -- Main.java --
import java.util.List;
import org.springframework.validation.DataBinder;
import org.springframework.validation.Errors;
import org.springframework.validation.FieldError;
import org.springmodules.validation.bean.BeanValidator;
import org.springmodules.validation.bean.conf.loader.annotation.AnnotationBeanValidationConfigurationLoader;
import org.springmodules.validation.bean.conf.loader.annotation.handler.CascadeValidation;
import org.springmodules.validation.bean.conf.loader.annotation.handler.Length;
import org.springmodules.validation.bean.conf.loader.annotation.handler.NotNull;
import org.springmodules.validation.bean.conf.loader.annotation.handler.Range;

public class Main {

  @NotNull(message = "Not Null")
  private String name;
  @Length(min = 5, max = 10)
  private String value;
  @Range(min = 1, max = 100)
  private int count;
  @CascadeValidation
  private Slave slave;

  public int getCount() {
    return count;
  }

  public void setCount(int count) {
    this.count = count;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public String getValue() {
    return value;
  }

  public void setValue(String value) {
    this.value = value;
  }

  public Slave getSlave() {
    return slave;
  }

  public void setSlave(Slave slave) {
    this.slave = slave;
  }

  public static void main(String[] args) {
    Main main = new Main();
    main.setValue("v");
    main.setSlave(new Slave());
    BeanValidator bv = new BeanValidator(
        new AnnotationBeanValidationConfigurationLoader());

    DataBinder dataBinder = new DataBinder(main, "testBean");

    Errors errors = dataBinder.getBindingResult();
    bv.validate(main, errors);

    List allErrors = errors.getAllErrors();
    for (FieldError fieldError : allErrors) {
      System.out.println(fieldError);
    }

  }
}

/*
Field error in object 'testBean' on field 'count': rejected value [0]; codes [Main.count[range].testBean.count,Main.count[range].count,Main.count[range].int,Main.count[range]]; arguments [Main@1457cb,1.0,100.0]; default message [range]
Field error in object 'testBean' on field 'name': rejected value [null]; codes [Main.name[not.null].testBean.name,Main.name[not.null].name,Main.name[not.null].java.lang.String,Main.name[not.null]]; arguments [Main@1457cb]; default message [not.null]
Field error in object 'testBean' on field 'value': rejected value [v]; codes [Main.value[length].testBean.value,Main.value[length].value,Main.value[length].java.lang.String,Main.value[length]]; arguments [Main@1457cb,5,10]; default message [length]
Field error in object 'testBean' on field 'slave.name': rejected value [null]; codes [Slave.name[not.null].testBean.slave.name,Slave.name[not.null].slave.name,Slave.name[not.null].name,Slave.name[not.null].java.lang.String,Slave.name[not.null]]; arguments [Slave@93dcd]; default message [Not Null]
*/