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java接口返回参数按照请求参数进行排序方式

目录

  • java接口返回参数按照请求参数进行排序
    • 排序
  • java通过接口进行排序
    • 描述
    • 知识点
      • 1.Comparable接口
      • 2.Comparator接口

java接口返回参数按照请求参数进行排序 在项目实际开发中可能遇到过这种问题，接口请求参数顺序是[a,b,c]，结果返回的数据是[bObject，cObject，aObject]，导致这种原因可能是底层采用了设计模式，或者是表拼接查询，本文主要就是为了实现这种功能，采用流的方法
【java接口返回参数按照请求参数进行排序方式】代码实现
import lombok.Data; import java.io.Serializable; /** * @description 模拟接口结果类 * @author: WilsonMeng * @create: 2021-01-26 14:26 **/@Datapublic class SkuInfo implements Serializable {private static final long serialVersionUID = -6242151519713186291L; /*** spuId*/private String spuId; /*** skuId*/private String skuId; /*** 商品名称*/private String productName; /*** 商品图片*/private String picture; /*** 商品链接*/private String link; }


排序
import com.alibaba.fastjson.JSON; import com.google.common.collect.Lists; import com.wanli.databoard.dto.SkuInfo; import java.util.Arrays; import java.util.Comparator; import java.util.List; import java.util.Objects; import java.util.stream.Collectors; /** * @description * @author: WilsonMeng * @create: 2021-01-26 14:28 **/public class SkuSortTest {public static void main(String[] args) {List skuIdList = Arrays.asList("sku1", "sku2", "sku3", "sku4"); //用于模拟接口入参System.out.println("skuid列表：" + JSON.toJSONString(skuIdList)); System.out.println(); List skuInfoList = Lists.newArrayList(); SkuInfo s1 = new SkuInfo(); s1.setSpuId("spu1"); s1.setSkuId("sku1"); s1.setProductName("商品1"); s1.setPicture("p1"); s1.setLink("link1"); skuInfoList.add(s1); SkuInfo s4 = new SkuInfo(); s4.setSpuId("spu1"); s4.setSkuId("sku4"); s4.setProductName("商品2"); s4.setPicture("p4"); s4.setLink("link4"); skuInfoList.add(s4); SkuInfo s3 = new SkuInfo(); s3.setSpuId("spu2"); s3.setSkuId("sku3"); s3.setProductName("商品3"); s3.setPicture("p3"); s3.setLink("link3"); skuInfoList.add(s3); SkuInfo s2 = new SkuInfo(); s2.setSpuId("spu2"); s2.setSkuId("sku2"); s2.setProductName("商品2"); s2.setPicture("p2"); s2.setLink("link2"); skuInfoList.add(s2); //用于模拟接口入参System.out.println("skuInfoList列表：" + JSON.toJSONString(skuInfoList)); System.out.println(); //按照请求参数进行排序List resultList = skuInfoList.stream().sorted(getSkuIdListComparator(skuIdList)).collect(Collectors.toList()); System.out.println("排序完成后的结果：" + JSON.toJSONString(resultList)); }private static Comparator getSkuIdListComparator(List skuIds) {return (o1, o2) -> {int order1 = 0, order2 = 0; for (int i = 0; i < skuIds.size(); i++) {if (Objects.equals(o1.getSkuId(), skuIds.get(i))) {order1 = i; }if (Objects.equals(o2.getSkuId(), skuIds.get(i))) {order2 = i; }}return order1 - order2; }; }}

代码运行结果：
skuid列表：["sku1","sku2","sku3","sku4"]
skuInfoList列表：[{"link":"link1","picture":"p1","productName":"商品1","skuId":"sku1","spuId":"spu1"},{"link":"link4","picture":"p4","productName":"商品2","skuId":"sku4","spuId":"spu1"},{"link":"link3","picture":"p3","productName":"商品3","skuId":"sku3","spuId":"spu2"},{"link":"link2","picture":"p2","productName":"商品2","skuId":"sku2","spuId":"spu2"}]
排序完成后的结果：[{"link":"link1","picture":"p1","productName":"商品1","skuId":"sku1","spuId":"spu1"},{"link":"link2","picture":"p2","productName":"商品2","skuId":"sku2","spuId":"spu2"},{"link":"link3","picture":"p3","productName":"商品3","skuId":"sku3","spuId":"spu2"},{"link":"link4","picture":"p4","productName":"商品2","skuId":"sku4","spuId":"spu1"}]

java通过接口进行排序
描述
对学生排序，先按成绩由大到小排序，成绩相同按姓名字母排序，姓名相同再按学号由小到大排序。
package src7; import java.util.*; class Student implements Comparable{private String name; private int id; private int grade; public Student(String name, int id, int grade) {this.name = name; this.id = id; this.grade = grade; }public int compareTo(Student o) {Student s = (Student) o; if (this.grade>s.grade) {return -1; //返回负数,当前成绩排前} else if (this.grade == s.grade) {//if (this.name.hashCode() < s.name.hashCode()) {//return -1; //使用hashCode()if (this.name.compareTo(s.name)<0) {return -1; //使用compareTo//} else if (this.name.hashCode() == s.name.hashCode()) {} else if (this.name.compareTo(s.name)==0) {if (this.id < s.id) {return -1; } else if (this.id == s.id) {return 0; //此处说明姓名学号成绩全部相同} else {return 1; }} else {return 1; // 返回正数，当前对象排后}} else {return 1; }}@Overridepublic String toString() {return "姓名：" + this.name +",学号："+this.id+ ",成绩：" + this.grade + "\n"; }}public class Test {public static void main(String[] args) {Scanner in = new Scanner(System.in); Student[] arr = new Student[3]; for (int i = 0; i < arr.length; i++) {System.out.println("输入第" + (i + 1) + "个学生的姓名、学号和成绩："); String name = in.next(); int id = in.nextInt(); int grade = in.nextInt(); arr[i] = new Student(name, id, grade); }System.out.println("排序前："); for(int i = 0; i < arr.length; i++){System.out.println(arr[i]); }System.out.println("排序后："); {Liststudents=Arrays.asList(arr); Collections.sort(students); System.out.println(students); //也可以使用冒泡排序for(int i=0; i
知识点

1.Comparable接口 包含的比较方法：
public interface Comparable< T >{public int compareTo(T obj); }

比较当前对象与外来对象，让当前对象排前就返回负值，反之返回正值，相等返回0
关于Comparable接口的简单举例：对人的姓和名进行排序
package src7; import java.util.*; class Person implements Comparable{private final String lastname,firstname; //lastname表示姓 firstname表示名public Person(String lastname,String firstname){this.lastname=lastname; this.firstname=firstname; }public String lastname(){return lastname; }public String firstname(){return firstname; }public boolean equals(Object obj){Person n=(Person)obj; return (n.lastname.equals(lastname)&&n.firstname.equals(firstname)); }public int hashCode(){return lastname.hashCode()+firstname.hashCode(); }public String toString(){return lastname+" "+firstname; }publicint compareTo(Person n){if(lastname.compareTo(n.lastname)<0)return -1; if(lastname.compareTo(n.lastname)>0)return 1; else {if(firstname.compareTo(n.firstname)<0)return -1; if(firstname.compareTo(n.firstname)>0)return 1; else return 0; }}}public class Test {public static void main(String[]args){Person personArr[]={new Person("Zhang","Liang"),new Person("Li","Si"),new Person("Wang","Ning"),new Person("Zhang","San"),new Person("Chen","Yi")}; Listpersons=Arrays.asList(personArr); Collections.sort(persons); System.out.println(persons); }}

运行结果：
java接口返回参数按照请求参数进行排序方式
文章图片


2.Comparator接口 包含的比较方法：
public interface Comparator< T >{public int compare(T obj1,T obj2); }

比较对象obj1和obj2，让obj1位于obj2之前则返回负值
简单举例：对姓名排序
package src7; import sun.awt.geom.AreaOp; import java.util.*; class Person{private String name; public Person(String name){this.name=name; }public String getName(){return name; }public String toString(){return name; }} public class Test{static final Comparator ODER_BY_NAME=new Comparator() {@Overridepublic int compare(Person o1, Person o2) {return o1.getName().compareTo(o2.getName()); }}; public static void main(String[] args) {Person personArr[]={new Person("ZhangLiang"),new Person("LiSi"),new Person("WangNing"),new Person("ZhangSan"),new Person("ChenYi")}; Listpersons=Arrays.asList(personArr); Collections.sort(persons,ODER_BY_NAME); System.out.println(persons); }}

运行结果：
java接口返回参数按照请求参数进行排序方式
文章图片

以上为个人经验，希望能给大家一个参考，也希望大家多多支持脚本之家。

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