JAVA 带你查看不一样的toSting

女爷i 2022-05-22 06:50 177阅读 0赞

### 带你查看不一样的toSting ###

java之toString优雅封装，方便输出日志：

### 学习目标 ###

*  *在项目里减少样板代码*
 *  *日志能输出有意义的信息*

--------------------

import org.apache.commons.lang3.builder.ReflectionToStringBuilder;
    import org.apache.commons.lang3.builder.ToStringBuilder;
    import org.apache.commons.lang3.builder.ToStringStyle;
    
    import java.lang.reflect.Field;
    import java.util.ArrayList;
    import java.util.List;
    
    public class LgToString {
        @Override
        public String toString(){
            Class<?> aClass = this.getClass();
            List<String>stringList = new ArrayList<>(20);
            while(aClass!=LgToString.class && aClass!=Object.class){
                Field[] fields = aClass.getDeclaredFields();
                for (Field f :fields) {
                    StringHidden hiddenClass = f.getAnnotation(StringHidden.class);
                    if (hiddenClass!=null){
                        stringList.add(f.getName());
                    }
                }
                aClass = aClass.getSuperclass();
            }
            String s = ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);
    
            String s1 = new ReflectionToStringBuilder(this, ToStringStyle.SHORT_PREFIX_STYLE)
                    .setExcludeFieldNames(stringList.toArray(new String[stringList.size()])).toString();
            return s1;
        }
    }

需要打印toString方法的 直接继承侧类就可以了

![这里写图片描述][70]

隐藏类:

import java.lang.annotation.ElementType;
    import java.lang.annotation.Retention;
    import java.lang.annotation.RetentionPolicy;
    import java.lang.annotation.Target;
    
    @Target(ElementType.FIELD)
    @Retention(RetentionPolicy.RUNTIME)
    public @interface StringHidden { }

### 如果不想打印某一个属性可以用注解隐藏 ###

![这里写图片描述][70 1]

[70]: /images/20220522/1bbff1bac2194e39aa606ccfc6032a62.png
[70 1]: /images/20220522/6f5ed9aa572f4060b513a406b53dd625.png