java 对象参数去空格方式

Posted 2022-12-02 huzi007

import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class Test 

    /**
     * 去掉bean中所有属性为字符串的前后空格
     *
     * @param bean
     * @throws Exception
     */
    public static void beanAttributeValueTrim(Object bean) throws Exception 
        if (bean != null) 
            //获取所有的字段包括public,private,protected,private
            Field[] fields = bean.getClass().getDeclaredFields();
            for (int i = 0; i < fields.length; i++) 
                Field f = fields[i];
                if (f.getType().getName().equals("java.lang.String")) 
                    String key = f.getName();
                    //获取字段名
                    Object value = getFieldValue(bean, key);

                    if (value == null)
                        continue;

                    setFieldValue(bean, key, value.toString().trim());
                
            
        
    

    /**
     * 利用反射通过get方法获取bean中字段fieldName的值
     *
     * @param bean
     * @param fieldName
     * @return
     * @throws Exception
     */
    private static Object getFieldValue(Object bean, String fieldName)
            throws Exception 
        StringBuffer result = new StringBuffer();
        String methodName = result.append("get")
                .append(fieldName.substring(0, 1).toUpperCase())
                .append(fieldName.substring(1)).toString();

        Object rObject = null;
        Method method = null;

        @SuppressWarnings("rawtypes")
        Class[] classArr = new Class[0];
        method = bean.getClass().getMethod(methodName, classArr);
        rObject = method.invoke(bean, new Object[0]);

        return rObject;
    

    /**
     * 利用发射调用bean.set方法将value设置到字段
     *
     * @param bean
     * @param fieldName
     * @param value
     * @throws Exception
     */
    private static void setFieldValue(Object bean, String fieldName, Object value)
            throws Exception 
        StringBuffer result = new StringBuffer();
        String methodName = result.append("set")
                .append(fieldName.substring(0, 1).toUpperCase())
                .append(fieldName.substring(1)).toString();

        //利用反射调用bean.set方法将value设置到字段
        @SuppressWarnings("rawtypes")
        Class[] classArr = new Class[1];
        classArr[0] = "java.lang.String".getClass();
        Method method = bean.getClass().getMethod(methodName, classArr);
        method.invoke(bean, value);