【java】在controller层使用的检查单一字段不能为null和检查属性中某些字段不能为null的工具

package com.sxd.swapping.base;import com.sxd.swapping.util.MyException;
import lombok.Getter;
import lombok.Setter;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;import java.beans.PropertyDescriptor;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.List;@Getter
@Setter
public class UniVerResponse<T> implements Serializable { private static final long serialVersionUID = 137671534756697880L; /**
* 正确
*/
public static final int SUCCESS_REQUEST = 200;
/**
* 参数错误返回码
*/
public static final int ERROR_PARAMS = 100001; /**
* 业务错误返回码
*/
public static final int ERROR_BUSINESS = 200001;
/**
* 系统异常返回码
*/
public static final int ERROR_SYS_EXCPTION = 500001; private boolean success; private String msg; private int code; private T obj; public void beTrue(T obj){
this.success = true;
this.msg = "successful";
this.code = SUCCESS_REQUEST;
this.obj = obj;
} public void beFalse(String msg,int code,T obj){
this.success = false;
this.msg = msg;
this.code = code;
this.obj = obj;
} /**
* 对象多字段判空检查
* 例如simplCheckField(user,"userId","userName")
* @param obj 被检查的对象
* @param propertys 被检查对象中的字段 可多个
* @throws MyException
*/
public static void checkField(Object obj,String...propertys) throws MyException{ if(obj != null && propertys != null && propertys.length > 0){
//字节码
Class<? extends Object> clazz = obj.getClass(); //遍历所有属性
for (int i = 0; i < propertys.length; i++) {
String property = propertys[i];
//内省机制获取属性信息
PropertyDescriptor pd = BeanUtils.getPropertyDescriptor(clazz,property );
if(pd != null){
//获取当前字段的javabean读方法
Method readMethod = pd.getReadMethod();
if(readMethod != null){ Object invoke = null; try {
invoke = readMethod.invoke(obj);
} catch (Exception e) {
throw new MyException("方法 "+ readMethod.getName() +"无法执行",UniVerResponse.ERROR_SYS_EXCPTION);
} if(invoke != null){
//String类型单独处理
Class<?> propertyType = pd.getPropertyType();
if("java.lang.String".equals(propertyType.getName())){ if(StringUtils.isBlank((String)invoke)){
throw new MyException("错误 : [ " + property + " ] 不能为空!",UniVerResponse.ERROR_PARAMS);
} }else if("java.util.List".equals(propertyType.getName())){
List list = (List)invoke;
if(list.size() == 0){
throw new MyException("错误 : [ " + property + " ] 不能为空!",UniVerResponse.ERROR_PARAMS);
}
}
}else{
throw new MyException("错误 : [ " + property + " ] 不能为空!",UniVerResponse.ERROR_PARAMS);
} }else{
//抛出异常
throw new MyException("在 " + clazz +"中 找不到"+"[ " + property + " ] 的 读方法",UniVerResponse.ERROR_SYS_EXCPTION);
} }else{
//抛出异常
throw new MyException("在 " + clazz +"中 找不到"+"[ " + property + " ] 属性",UniVerResponse.ERROR_SYS_EXCPTION);
}
}
}
} /**
* 单一字段判空检查
* 可检查对象的单个属性判空 例如simplCheckField(user,"userId")
* 也可做某个变量的单独判空 例如simplCheckField(userId,"userId")
* @param obj 被检查的对象
* @param property 被检查的对象的字段
* @throws MyException
*/
public static void simplCheckField(Object obj,String property) throws MyException{ if(obj instanceof String){
if(StringUtils.isBlank((String)obj)){
throw new MyException("错误 : [ " + property + " ] 不能为空!",UniVerResponse.ERROR_PARAMS);
}
}else if(obj instanceof List){
List list = (List)obj;
if(list.size() == 0){
throw new MyException("错误 : [ " + property + " ] 不能为空!",UniVerResponse.ERROR_PARAMS);
}
}else{
if(obj == null){
throw new MyException("错误 : [ " + property + " ] 不能为空!",UniVerResponse.ERROR_PARAMS);
}
}
}}

package com.sxd.swapping.util;import lombok.Getter;
import lombok.Setter;/**
* 自定义异常
*/
@Getter
@Setter
public class MyException extends RuntimeException { private int code; public MyException(String msg){
super(msg);
} public MyException(String msg,int code){
super(msg);
this.code = code;
}}