Java Map转二维数组，Map转数组

Java Map转二维数组，Map转数组

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©Copyright 蕃薯耀 2021-07-02

https://www.cnblogs.com/fanshuyao/

import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang3.ArrayUtils;
import org.assertj.core.util.Arrays;

/**
 * Map转二维数组
 *
 */
public class MapArrayUtils {
    
    
    /**
     * Map转二维数组
     * @param row Row
     * @return
     */
    @SuppressWarnings("rawtypes")
    public static Object[][] getTwoArrayObject(Map map) {
        Object[][] object = null;
        if (map != null && !map.isEmpty()) {
            int size = map.size();
            object = new Object[size][2];
            
            Iterator iterator = map.entrySet().iterator();
            for (int i = 0; i < size; i++) {
                Map.Entry entry = (Map.Entry) iterator.next();
                Object key = entry.getKey();
                Object value = entry.getValue();
                object[i][0] = key;
                object[i][1] = value;
            }
        }
        return object;
    }
    
    
    /**
     * 根据指定的keys获取Map中的属性
     * @param map
     * @param keys
     * @return
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public static Map<String, Object> getMapByExistKeys(Map map, String[] keys) {
        if(map == null ||  map.isEmpty()) {
            return null;
        }
        
        if(keys == null || keys.length < 1) {
            return null;
        }
        
        Map<String, Object> resultMap = new LinkedHashMap<String, Object>(keys.length);
        
        Set<String> set = map.keySet();
        
        for (String key : set) {
            if(ArrayUtils.contains(keys, key)) {
                resultMap.put(key, map.get(key));
            }
        }
        return resultMap;
    }
    
    
    /**
     * 排除指定的keys获取Map中的其它属性
     * @param map
     * @param excludeKeys 排除的keys
     * @return
     */
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public static Map<String, Object> getMapByExcludeKeys(Map map, String[] excludeKeys) {
        if(map == null ||  map.isEmpty()) {
            return null;
        }
        
        Map<String, Object> resultMap = new LinkedHashMap<String, Object>();
        
        Set<String> set = map.keySet();
        
        for (String key : set) {
            if(ArrayUtils.contains(excludeKeys, key)) {
                continue;
            }
            resultMap.put(key, map.get(key));
        }
        
        return resultMap;
    }

    
    /**
     * 数据类型转换
     * @param value Object
     * @param datePattern String
     * @return
     */
    public static String valueCast(Object value, String datePattern) {
        
        String valueString = "";
        
        //类型转换
        if(value == null) {
            valueString = "";
            
        }else if(value instanceof String) {
            valueString = (String)value;
            
        }else if(value instanceof Date) {//日期时间
            Date date = (Date)value;
            
            if(StringUtils.isBlank(datePattern)) {
                valueString = DateUtils.formatDateTime(date);
            }else {
                valueString = DateUtils.format(date, datePattern);
            }
            
        }else if(Arrays.isArray(value) ||  value instanceof Collection) {//数组和集合
            //判断是否为数组（建议优先使用Arrays）：
            //1：Arrays.isArray(value)
            //2：value.getClass().isArray()
            valueString = JsonUtil.obj2String(value);
            
        }else {
            valueString = String.valueOf(value);
        }
        
        return valueString;
    }
    
    
    /**
     * Map转二维数组
     * @param map Map参数
     * @param keys 数组，当不为空时，只取keys里面的属性；当为空时，取出所有属性
     * @param datePattern 时间转换格式
     * @return
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static String[][] getTwoArray(Map map, String[] keys, String datePattern) {
        
        if(map == null || map.isEmpty()) {
            return null;
        }
        
        if(keys != null && keys.length > 0) {
            map = getMapByExistKeys(map, keys);
            
            //需要再次判断map是否为空
            if(map == null || map.isEmpty()) {
                return null;
            }
        }
        
        String[][] array = new String[map.size()][2];
        Set<String> set = map.keySet();
        
        //数组索引
        int index = 0;
        
        for (String key : set) {
            
            if(keys != null && keys.length > 0) {
                if(!ArrayUtils.contains(keys, key)) {
                    continue;
                }
            }
            
            Object value = map.get(key);
            
            array[index][0] = key;
            array[index][1] = valueCast(value, datePattern);
            
            index ++; 
        }
        
        return array;
    }
    
    
    /**
     * Map转二维数组
     * @param map Map参数
     * @param datePattern 时间转换格式
     * @return
     */
    @SuppressWarnings("rawtypes")
    public static String[][] getTwoArray(Map map, String datePattern){
        return getTwoArray(map, null, datePattern);
    }
    
    
    /**
     * Map转二维数组
     * @param map Map参数
     * @param keys 数组，当不为空时，只取keys里面的属性；当为空时，取出所有属性
     * @return
     */
    @SuppressWarnings("rawtypes")
    public static String[][] getTwoArray(Map map, String[] keys){
        return getTwoArray(map, keys, null);
    }
    
    
    /**
     * Map转二维数组
     * @param map Map参数
     * @return
     */
    @SuppressWarnings("rawtypes")
    public static String[][] getTwoArray(Map map){
        return getTwoArray(map, null, null);
    }
    
    
    
    /**
     * Map转二维数组
     * @param map Map参数
     * @param keys 数组，当不为空时，只取keys里面的属性；当为空时，取出所有属性
     * @param datePattern 时间转换格式
     * @return
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static String[][] getTwoArrayExclude(Map map, String[] excludeKeys, String datePattern) {
        
        if(map == null || map.isEmpty()) {
            return null;
        }
        
        if(excludeKeys != null && excludeKeys.length > 0) {
            map = getMapByExcludeKeys(map, excludeKeys);
            
            //需要再次判断map是否为空
            if(map == null || map.isEmpty()) {
                return null;
            }
        }
        
        String[][] array = new String[map.size()][2];
        Set<String> set = map.keySet();
        
        //数组索引
        int index = 0;
        
        for (String key : set) {
            
            Object value = map.get(key);
            
            array[index][0] = key;
            array[index][1] = valueCast(value, datePattern);
            
            index ++; 
        }
        
        return array;
    }
    
    
    /**
     * Map转二维数组
     * @param map Map参数
     * @param excludeKeys 数组，当不为空时，取排除keys里面的其它属性；当为空时，取出所有属性
     * @return
     */
    @SuppressWarnings("rawtypes")
    public static String[][] getTwoArrayExclude(Map map, String[] excludeKeys){
        return getTwoArrayExclude(map, excludeKeys, null);
    }
    
    
    
    public static void main(String[] args) {
        Map<String, Object> map = new LinkedHashMap<String, Object>();
        
        map.put("aa", "11");
        map.put("bb", 2);
        map.put("cc", true);
        map.put("dd", new Date());
        map.put("ee", 6.333);
        map.put("ff", 66666666666L);
        map.put("gg", null);
        
        int[] a = new int[] {1,2,3};
        map.put("ii", a);
        
        List<String> j = new ArrayList<String>();
        j.add("a");
        j.add("aa");
        j.add("aaa");
        map.put("jj", j);
        
        long start = System.currentTimeMillis();
        System.out.println("start = " + start);
        
        String[][] array = getTwoArray(map, null, DateUtils.DATE);
        
        long end = System.currentTimeMillis();
        System.out.println("end = " + end);
        System.out.println("end - start = " + (end - start));
        
        if(array != null && array.length > 0) {
            for(int n = 0; n < array.length; n++) { 
                System.out.println(array[n][0] + " = " + array[n][1]);  
            }
        }else {
            System.out.println("array = " + array);  
        }
        System.out.println("---------------------------------------------"); 
        
        
        long start2 = System.currentTimeMillis();
        System.out.println("start2 = " + start2);
        
        String[][] array2 = getTwoArray(map, new String[] {"dd", "cc", "ccc", "bb", "EE"}, DateUtils.DATE);
        
        long end2 = System.currentTimeMillis();
        System.out.println("end2 = " + end2);
        System.out.println("end2 - start2 = " + (end2 - start2));
        
        if(array2 != null && array2.length > 0) {
            for(int n = 0; n < array2.length; n++) { 
                System.out.println(array2[n][0] + " = " + array2[n][1]);  
            }
        }else {
            System.out.println("array2 = " + array2);  
        }
        System.out.println("---------------------------------------------"); 
        
        
        Map<String, Object> resultMap = getMapByExistKeys(map, new String[]{"aa", "BB", "cc"});
        System.out.println("resultMap = " + resultMap);  
        System.out.println("---------------------------------------------"); 
        
        Map<String, Object> ExcludeMap = getMapByExcludeKeys(map, new String[]{"aa", "BB", "cc"});
        System.out.println("ExcludeMap = " + ExcludeMap);  
        System.out.println("---------------------------------------------"); 
        
        
        long start3 = System.currentTimeMillis();
        System.out.println("start3 = " + start3);
        
        String[][] array3  = getTwoArrayExclude(map, new String[]{"aa", "BB", "cc"});
        
        long end3 = System.currentTimeMillis();
        System.out.println("end3 = " + end3);
        System.out.println("end3 - start3 = " + (end3 - start3));
        
        if(array3 != null && array3.length > 0) {
            for(int n = 0; n < array3.length; n++) { 
                System.out.println(array3[n][0] + " = " + array3[n][1]);  
            }
        }else {
            System.out.println("array3 = " + array3);  
        }
        System.out.println("---------------------------------------------"); 
        
        
        /*
        System.out.println("---------------------------------------------"); 
        
        Object[][] array22 = getTwoArrayObject(map);
        
        if(array22 != null && array22.length > 0) {
            for(int n = 0; n < array22.length; n++) { 
                System.out.println(array22[n][0] + " = " + array22[n][1]);  
            }
        }else {
            System.out.println("array22 = " + array22);  
        }
        */
        
    }
    
    
    
}

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©Copyright 蕃薯耀 2021-07-02

https://www.cnblogs.com/fanshuyao/