反射設置字段值的2種方式

 private <T> void setFiledValue(String fileName,Object value,Class<T> clz) throws IllegalAccessException, InstantiationException, InvocationTargetException {
        //該方式找不到對應字段不會報錯
        if(StringUtils.isEmpty(fileName)){
            return;
        }
        //轉成SetXXX方法名
        char[] chars = fileName.toCharArray();
        chars[0]=(char) (chars[0]-32); //首字母轉大寫
        //拼接成方法名
        String methodName="set"+String.copyValueOf(chars);
        T t = clz.newInstance();//獲取對象
        Method[] declaredMethods = clz.getDeclaredMethods();
        for (Method method : declaredMethods) {
            String name = method.getName();
            boolean equals = method.getName().equals(methodName);
            if(equals){
                method.invoke(t,value);
                System.out.println(t.toString());
            }

        }

    }

 private <T> void setFiledValue2(String fileName,Object value,Class<T> clz) throws IllegalAccessException, InstantiationException, InvocationTargetException, NoSuchFieldException {
       //該方法如果獲取不到字段值就會拋異常
        if(StringUtils.isEmpty(fileName)){
            return;
        }

        Field field = clz.getDeclaredField(fileName);//獲取字段
        T t = clz.newInstance();
        if(field!=null){
            field.setAccessible(true);//修改作用域
            field.set(t,value);//設置值
            System.out.println(t.toString());
        }

    }

//設置用戶
public class User {
    private String name;

    public String getName() {
        return name;
    }

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

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                '}';
    }
}
 @Test
    public void test2(){
        //根據字段名字,反射設置值

        try {
            setFiledValue2("name", "xiaoMing",User.class);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }

    }