Java Map转换工具类

import java.io.IOException;
import java.io.Reader;
import java.sql.Clob;
import java.sql.SQLException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

/**
 * Map处理工具
 * DingQiMing 2021-10-15
 */
public class MapUtil {

    /**
     * clob 转 String
     * @param clob
     * @return
     * @throws SQLException
     * @throws IOException
     */
    public static String ClobToString(Clob clob) throws SQLException,
            IOException {
        String reString = null;
        if (clob == null) {
            return null;
        }
        Reader inStreamDoc = clob.getCharacterStream();
        char[] tempDoc = new char[(int) clob.length()];
        inStreamDoc.read(tempDoc);
        inStreamDoc.close();
        reString = new String(tempDoc);

        return reString;
    }

    /**
     * clob 转 String
     * @param list
     * @return
     * @throws IOException
     * @throws SQLException
     */
    public static List<Map> ClobToString(List<Map> list) throws IOException, SQLException {
        if(list !=null && list.size() > 0){
            for(Map map : list){
                Iterator entries = map.entrySet().iterator();
                while (entries.hasNext()) {
                    Map.Entry entry = (Map.Entry) entries.next();
                    if(entry.getValue() instanceof Clob){
                        map.put(entry.getKey(),ClobToString((Clob)entry.getValue()));
                    }
                }
            }
        }

        return list;
    }

    /**
     * clob 转 String
     * @param map
     * @return
     * @throws IOException
     * @throws SQLException
     */
    public static Map ClobToString(Map map) throws IOException, SQLException {
        if(map !=null){
            Iterator entries = map.entrySet().iterator();
            while (entries.hasNext()) {
                Map.Entry entry = (Map.Entry) entries.next();
                if(entry.getValue() instanceof Clob){
                    map.put(entry.getKey(),ClobToString((Clob)entry.getValue()));
                }
            }
        }

        return map;
    }
    /**
     * key 转 小写
     * @param list
     * @return
     * @throws IOException
     * @throws SQLException
     */
    public static List<Map> toLowerCase(List<Map> list) throws IOException, SQLException {
        if(list !=null && list.size() > 0){
            for(Map map : list){
                Iterator entries = map.entrySet().iterator();
                while (entries.hasNext()) {
                    Map.Entry<String,Object> entry = (Map.Entry) entries.next();
                    if(entry.getValue() instanceof Clob){
                        map.put(entry.getKey().toLowerCase(),ClobToString((Clob)entry.getValue()));
                    }else {
                        map.put(entry.getKey().toLowerCase(),entry.getValue());
                    }
                }
            }
        }
        return list;
    }

    /**
     * key 转 大写
     * @param list
     * @return
     * @throws IOException
     * @throws SQLException
     */
    public static List<Map> toUpperCase(List<Map> list) throws IOException, SQLException {
        if(list !=null && list.size() > 0){
            for(Map map : list){
                Iterator entries = map.entrySet().iterator();
                while (entries.hasNext()) {
                    Map.Entry<String,Object> entry = (Map.Entry) entries.next();
                    if(entry.getValue() instanceof Clob){
                        map.put(entry.getKey().toUpperCase(),ClobToString((Clob)entry.getValue()));
                    }else {
                        map.put(entry.getKey().toUpperCase(),entry.getValue());
                    }
                }
            }
        }
        return list;
    }

    /**
     * key 转 小写
     * @param map
     * @return
     * @throws IOException
     * @throws SQLException
     */
    public static Map toLowerCase(Map map) throws IOException, SQLException {
        if(map !=null){
            Iterator entries = map.entrySet().iterator();
            while (entries.hasNext()) {
                Map.Entry<String,Object> entry = (Map.Entry) entries.next();
                if(entry.getValue() instanceof Clob){
                    map.put(entry.getKey().toLowerCase(),ClobToString((Clob)entry.getValue()));
                }else{
                    map.put(entry.getKey().toLowerCase(),entry.getValue());
                }
            }
        }

        return map;
    }

    /**
     * key 转 大写
     * @param map
     * @return
     * @throws IOException
     * @throws SQLException
     */
    public static Map toUpperCase(Map map) throws IOException, SQLException {
        if(map !=null){
            Iterator entries = map.entrySet().iterator();
            while (entries.hasNext()) {
                Map.Entry<String,Object> entry = (Map.Entry) entries.next();
                if(entry.getValue() instanceof Clob){
                    map.put(entry.getKey().toUpperCase(),ClobToString((Clob)entry.getValue()));
                }else {
                    map.put(entry.getKey().toUpperCase(),entry.getValue());
                }
            }
        }
        return map;
    }
}

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