java 反射getter setter 方法

package birunet.spring.util;
import java.lang.reflect.Field;  
import java.lang.reflect.Method;




public class GetterSetter<T> {  

    /** 
     * java反射bean的get方法 
     *  
     * @param claz 
     * @param fieldName属性名 
     * @return 
     */  
    @SuppressWarnings({ "unchecked", "rawtypes" })  
    public Method getGetter(Class claz, String fieldName) {  
        StringBuilder sb = new StringBuilder();  
        sb.append("get").append(fieldName.substring(0, 1).toUpperCase())  
                .append(fieldName.substring(1));  
        try {  
            Class[] types = new Class[] {};  
            return claz.getMethod(sb.toString(), types);  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return null;  
    }  

    /** 
     * java反射bean的set方法 
     *  
     * @param claz 
     * @param fieldName属性名 
     * @return 
     */  
    @SuppressWarnings({ "unchecked", "rawtypes" })  
    public static Method getSetter(Class claz, String fieldName) {  
        try {  
            Class[] parameterTypes = new Class[1];  
            Field field = claz.getDeclaredField(fieldName);  
            parameterTypes[0] = field.getType();// 返回参数类型  
            StringBuilder sb = new StringBuilder();  
            sb.append("set").append(fieldName.substring(0, 1).toUpperCase())  
                    .append(fieldName.substring(1));  
            Method method = claz.getMethod(sb.toString(), parameterTypes);  
            return method;  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return null;  
    }  

    /** 
     * 执行set方法 
     *  
     * @param t执行对象 
     * @param fieldName属性名 
     * @param value值 
     */  

    public void invokeSetter(T t, String fieldName, Object value) {  
        Method method = getSetter(t.getClass(), fieldName);  
        try {  
            method.invoke(t, new Object[] { value });  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  

    /** 
     * 执行get方法 
     *  
     * @param t执行对象 
     * @param fieldName属性名 
     */  
    public Object invokeGetter(T t, String fieldName) {  
        Method method = getGetter(t.getClass(), fieldName);  
        try {  

            return method.invoke(t, new Object[0]);  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
        return null;  
    }  



    /** 
     * @param args 
     */  
//    public static void main(String[] args) {  
//        GetterSetter gs = new GetterSetter();  
//        SMUser user = new SMUser();  
//        for (int i = 0; i < 33; i++) {  
//            gs.invokeSetter(user, "userId", "11");  
//            System.out.println(gs.invokeGetter(user, "userId"));  
//        }  
//    }  
}  

参照链接