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);
}
}