一个JAVA中文排序的需求(记录一下)

素颜马尾好姑娘i 2022-05-17 09:44 103阅读 0赞

需求：

一个对象中有标题和作者字段，都是中文。要求给这个对象集合排序，排序规则为 按照对象当中的标题字段或者作者字段进行升序或者降序排序。

解决如下：

首先想了一下 java如何对中文进行排序如下代码：

package com.xc.test2;
    import java.text.Collator;
    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.Comparator;
    import java.util.List;
    
    public class SortTest {
    
        private final static Comparator<Object> CHINA_COMPARE = Collator.getInstance(java.util.Locale.CHINA);
    
        public static void main(String[] args) {
            List<String> cityList = new ArrayList<String>();
            cityList.add("啊");
            cityList.add("的");
            cityList.add("吃");
            cityList.add("不");
    
            Collections.sort(cityList, CHINA_COMPARE);
            System.out.println(cityList);
        }
    
    }

输出结果：

[啊, 不, 吃, 的]

果然可以根据汉子的拼音顺序排序，那就好办了

需求排序的实体类如下：

public class FullTextLibraryDTO  implements Serializable{
    
    	private String id;	
    	// 题名
    	private String title;
    	
    	// 作者
    	private String author;
    	
    
    	private String classfication;
    	
    	
    	private ArrayList<String> indexTags;
    	
    	private String indexTag;
    	
    	private String press;
    	
    	// 创建时间
    	private Date createDate;
    
    	private String fileId;
    	
    	private Long tempSize;
    	
    	private String sortColum;
    	
    	private String sortType;
    
    	
    
    	public String getSortColum() {
    		return sortColum;
    	}
    
    	public void setSortColum(String sortColum) {
    		this.sortColum = sortColum;
    	}
    
    	public String getSortType() {
    		return sortType;
    	}
    
    	public void setSortType(String sortType) {
    		this.sortType = sortType;
    	}
    
    	public String getId() {
    		return id;
    	}
    
    	public void setId(String id) {
    		this.id = id;
    	}
    
    	public String getTitle() {
    		return title;
    	}
    
    	public void setTitle(String title) {
    		this.title = title;
    	}
    
    	public String getAuthor() {
    		return author;
    	}
    
    	public void setAuthor(String author) {
    		this.author = author;
    	}
    
    	public String getClassfication() {
    		return classfication;
    	}
    
    	public void setClassfication(String classfication) {
    		this.classfication = classfication;
    	}
    
    	public ArrayList<String> getIndexTags() {
    		return indexTags;
    	}
    
    	public void setIndexTags(ArrayList<String> indexTags) {
    		this.indexTags = indexTags;
    	}
    
    	public String getIndexTag() {
    		return indexTag;
    	}
    
    	public void setIndexTag(String indexTag) {
    		this.indexTag = indexTag;
    	}
    
    	public String getPress() {
    		return press;
    	}
    
    	public void setPress(String press) {
    		this.press = press;
    	}
    
    	public Date getCreateDate() {
    		return createDate;
    	}
    
    	public void setCreateDate(Date createDate) {
    		this.createDate = createDate;
    	}
    
    	public String getFileId() {
    		return fileId;
    	}
    
    	public void setFileId(String fileId) {
    		this.fileId = fileId;
    	}
    
    	public Long getTempSize() {
    		return tempSize;
    	}
    
    	public void setTempSize(Long tempSize) {
    		this.tempSize = tempSize;
    	}
    		
    	
    }

自己写了一个工具类如下(为写比较器做准备)：

package com.bigdata.lab.ymlib.util;
    
    import java.text.Collator;
    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.Comparator;
    import java.util.List;
    /**
     * 
     * @author xuchuang
     *
     */
    public class HanZiSortUtil {
    	
    	private final static Comparator<Object> CHINA_COMPARE = Collator.getInstance(java.util.Locale.CHINA);
    	
    	public static int compChineseWords(String word1,String word2){
    		
    		List<String> compList=new ArrayList<String>();
    		compList.add(word1);
    		compList.add(word2);
            //通过collections的sort方法进行排序
    		Collections.sort(compList, CHINA_COMPARE);
            //自定义一个排序规则
    		if(word1.equals(compList.get(0))){
    			return 1;
    		}else{
    			return 0;
    		}
    		
    		
    	}
    
    }

下面开始写比较器：

class FullTextLibraryDTOBytitle implements Comparator<FullTextLibraryDTO> {
    	 
    	@Override
    	public int compare(FullTextLibraryDTO k1, FullTextLibraryDTO k2) {
         //返回1代表左边大于右边  比如“我”的首字母为w “安”的首字母为a    w>a
        //返回-1代表左边小于右边
        //返回0代表这两个首字母相同
    		if(k1.getSortColum().equals("title")){
    			
    			if(k1.getSortType().equals("DESC")){
    				if (HanZiSortUtil.compChineseWords(k1.getTitle(), k2.getTitle())==1) {
    					return 1;
    				} else if (HanZiSortUtil.compChineseWords(k1.getTitle(), k2.getTitle())==0) {
    					return -1;
    				} else {
    					return 0;
    				}
    				
    			}else{
    				if (HanZiSortUtil.compChineseWords(k1.getTitle(), k2.getTitle())==1) {
    					return -1;
    				} else if (HanZiSortUtil.compChineseWords(k1.getTitle(), k2.getTitle())==0) {
    					return 1;
    				} else {
    					return 0;
    				}
    				
    			}
    			
    		}else{
    			
    			if(k1.getSortType().equals("DESC")){
    				
    				if (HanZiSortUtil.compChineseWords(k1.getAuthor(), k2.getAuthor())==1) {
    					return 1;
    				} else if (HanZiSortUtil.compChineseWords(k1.getAuthor(), k2.getAuthor())==0) {
    					return -1;
    				} else {
    					return 0;
    				}
    				
    			}else{
    				if (HanZiSortUtil.compChineseWords(k1.getAuthor(), k2.getAuthor())==1) {
    					return -1;
    				} else if (HanZiSortUtil.compChineseWords(k1.getAuthor(), k2.getAuthor())==0) {
    					return 1;
    				} else {
    					return 0;
    				}
    			}
    			
    		}
    	
    	}
     
    }

比较器使用如下：

1.将要排序的字段  以及排序规则设置到dto当中

![70][]

2.然后使用collections的sort方法

![70 1][]

经测试，实现功能。

[70]: /images/20220517/173e4716ec9946c19b51140c9f604f71.png
[70 1]: /images/20220517/8ba6b4ffb19140c5b3064e786aabab51.png