java String与常用数据类型转换

// An highlighted block
package com.liumin.conversion;

import java.lang.reflect.Constructor;

/**
 * @Author:lm
 * @Despriction: 数据类型转换
 * @Date:2019/3/28 11:37
 */
public class ConversionUtil {

 	/**
     *
     * @param clazz 要转换的类型（传入的类型为基本数据类型的包装类）
     * @param value 要转换的字符串
     * @return
     */
    public static Object conversionObject(Class<?> clazz, String value) {
        try {
        	//Character 特殊处理
        	if(clazz == Character.class){
                return value.charAt(0);
            }
        	//通过反射获取有参数为String的构造方法
            Constructor constructor = clazz.getDeclaredConstructor(String.class);
            //设为允许访问
            constructor.setAccessible(true);
            //传参 并 实例
            Object object = constructor.newInstance(new Object[]{value});
            return object;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

}

测试

public class Test {

    public static void main(String[] args) {
        System.out.println(ConversionUtil.conversionObject(Integer.class, "1234"));
        System.out.println(ConversionUtil.conversionObject(Boolean.class, "false"));
        System.out.println(ConversionUtil.conversionObject(Long.class, "123431312312312313"));
        System.out.println(ConversionUtil.conversionObject(Double.class, "1234.123123"));
        System.out.println(ConversionUtil.conversionObject(Byte.class, "1"));
        System.out.println(ConversionUtil.conversionObject(Short.class, "1"));
        System.out.println(ConversionUtil.conversionObject(Float.class, "3.14"));
        System.out.println(ConversionUtil.conversionObject(Character.class, "a"));
    }
}

结果