ToStringBuilder重写toString方法节省内存

 

Spring工具类ToStringBuilder用法简介

比如说我们需要打印某个方法的User参数对象

  package test;

  /**

    *

    * @author zhengtian

    * @time 2012-6-28

    */

    public class User {

        private String name;

        private int age;

        

        public String getName() {

            return name;

        }

        

        public void setName(String name) {

            this.name = name;

        }

        

        public int getAge() {

            return age;

        }

        

        public void setAge(int age) {

            this.age = age;

        }

  }

下面是ToStringBuilder的使用方法

  System.out.println("-------------ToStringBuilder-------------------------");

    User u = new User();

    u.setAge(25);

    u.setName("zhengtian");

    

  //对象及其属性一行显示

    System.out.println(ToStringBuilder.reflectionToString(u));

    System.out.println(ToStringBuilder.reflectionToString(u, ToStringStyle.DEFAULT_STYLE));

    //属性换行显示

    System.out.println(ToStringBuilder.reflectionToString(u, ToStringStyle.MULTI_LINE_STYLE));

    //不显示属性名，只显示属性值，在同一行显示

    System.out.println(ToStringBuilder.reflectionToString(u, ToStringStyle.NO_FIELD_NAMES_STYLE));

    //对象名称简写

    System.out.println(ToStringBuilder.reflectionToString(u, ToStringStyle.SHORT_PREFIX_STYLE));

    //只显示属性

    System.out.println(ToStringBuilder.reflectionToString(u, ToStringStyle.SIMPLE_STYLE));

结果显示：

-------------ToStringBuilder-------------------------

test.User@141d683[name=zhengtian,age=25]

test.User@141d683[name=zhengtian,age=25]

test.User@141d683[

  name=zhengtian

  age=25

]

test.User@141d683[zhengtian,25]

User[name=zhengtian,age=25]

zhengtian,25

描述：ToStringBuilder比较适合在打日志时，输出参数的信息，特别是在参数为对象时，该工具类能够很方便的自动打印对象中的属性值。

 

==============================================================

 

 

/*
 * Created on Jan 29, 2015
 *
 * Copyright  2006 ATPCO Confidential and Proprietary. All Rights Reserved.
 */
package com.atpco.textload.util;

import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang.builder.ToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;

import bsh.This;

public class Test {

 public static void main(String[] args) throws Exception {

   Student studentOne = new Student();
         studentOne.setName("???");
         studentOne.setAge(34);
         List<Student> studentList = new ArrayList<Student>();
         studentList.add(studentOne);
         Teacher teacher = new Teacher();
         teacher.setName("???");
         teacher.setAge(33);
         teacher.setStudent(studentList);
         System.out.println(teacher);

 }

}

class Teacher {
    private String name;
    private int age;
    private List<Student> student;
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public int getAge() {
        return age;
    }
 
    public void setAge(int age) {
        this.age = age;
    }
 
    public List<Student> getStudent() {
        return student;
    }
 
    public void setStudent(List<Student> student) {
        this.student = student;
    }
 
    @Override
    public String toString() {
        //return new ToStringBuilder(this,ToStringStyle.SHORT_PREFIX_STYLE).append("name", this.name).append("age",this.age).append("student",this.student).toString(); 
        return ToStringBuilder.reflectionToString(this,ToStringStyle.SHORT_PREFIX_STYLE);
    }
}

class Student {
    private String name;
    private int age;
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public int getAge() {
        return age;
    }
 
    public void setAge(int age) {
        this.age = age;
    }
 
    @Override
    public String toString() {
        //return new ToStringBuilder(this,ToStringStyle.SHORT_PREFIX_STYLE).append("name", this.name).append("age",this.age).toString();        
     return ToStringBuilder.reflectionToString(this,ToStringStyle.SHORT_PREFIX_STYLE);
    }
}