拿來即用的JSON轉Map工具類

自己以前編寫整理的工具類，不需要導包，主要部分僅使用JAVA系統自帶類庫即可完成。

爲了使用方便，直接處理 HttpServletRequest 對象，支持解析前端傳回JSON中帶的Map對象、List<Map>對象及鍵值對。

（測試時勿用String轉JSON的JSON，表達的Map及List<Map>會被解析成String）

具體代碼如下:

import javax.servlet.http.HttpServletRequest;
import java.util.*;
import java.util.Map.Entry;

/**
 * @author bluecoolcool
 * @date 2018/06/28 16:12
 */
public class RequestUtils {

	/**
	 * 返回map
	 * @param request
	 * @return
	 */
	public static Map<String,Object> getMap(HttpServletRequest request){
		
		Map<String,Object> mapPrarm = new HashMap<String, Object>();
		
		Map map = request.getParameterMap();
		
		Set ketSet = map.entrySet();
		String listName = "";
		boolean isList = false;
		List paramList = new ArrayList();
		Map paramMap = new HashMap();
		for (Iterator it = ketSet.iterator();it.hasNext();) {
			Entry me = (Entry) it.next();
			Object key = me.getKey();
			Object value = me.getValue();
			String[] valueArr = new String[1];
			if(value instanceof String[]){
				valueArr = (String[]) value;
			}else{
				valueArr[0] = value.toString();
			}
			if(key.toString().contains("[") && key.toString().contains("]")){
				String newName = key.toString().substring(0,key.toString().indexOf("]")+1);
				String[] finalValueArr = valueArr;
				String newValue = Arrays.toString(finalValueArr).substring(1, Arrays.toString(finalValueArr).length()-1);
				String keyName = key.toString().substring(key.toString().lastIndexOf("[")+1,key.toString().lastIndexOf("]"));
				isList = letterOrNum(key.toString().substring(key.toString().indexOf("[")+1,key.toString().indexOf("]")));
				if(listName.equals("")){
					listName = newName;
					paramMap.put( keyName , newValue);
				}else if(listName.equals(newName)){
					paramMap.put( keyName , newValue);
				}else if(listName.substring(0,listName.indexOf("[")).equals(newName.substring(0,newName.indexOf("[")))){
					if(isList){
						paramList.add(paramMap);
						listName = newName;
						paramMap = new HashMap();
						paramMap.put( keyName , newValue);
					}else{
						paramMap.put( keyName , newValue);
					}
				}else{
					if(letterOrNum(listName.substring(listName.indexOf("[")+1,listName.indexOf("]")))){
						paramList.add(paramMap);
						mapPrarm.put(listName.substring(0,listName.indexOf("[")), paramList);
					}else{
						mapPrarm.put(listName.substring(0,listName.indexOf("[")), paramMap);
					}
					listName = newName;
					paramList = new ArrayList<>();
					paramMap = new HashMap();
					paramMap.put( keyName , newValue);
				}
			}else{
				if(listName.equals("")){
					for(int k = 0;k<valueArr.length;k++){
						mapPrarm.put(key.toString(), valueArr[k]);
					}
				}else{
					if(letterOrNum(listName.substring(listName.indexOf("[")+1,listName.indexOf("]")))) {
						paramList.add(paramMap);
						mapPrarm.put(listName.substring(0, listName.indexOf("[")), paramList);
					}else{
						mapPrarm.put(listName.substring(0, listName.indexOf("[")), paramMap);
					}
					for (int k = 0; k < valueArr.length; k++) {
						mapPrarm.put(key.toString(), valueArr[k]);
					}
					listName = "";
					paramList = new ArrayList<>();
					paramMap = new HashMap();
				}
			}
		}
		if(!(listName.equals(""))){
			if(letterOrNum(listName.substring(listName.indexOf("[")+1,listName.indexOf("]")))) {
				paramList.add(paramMap);
				mapPrarm.put(listName.substring(0,listName.indexOf("[")), paramList);
			}else{
				mapPrarm.put(listName.substring(0, listName.indexOf("[")), paramMap);
			}
		}else if(!(paramMap.size()==0)){
			mapPrarm.put(listName.substring(0,listName.indexOf("[")), paramMap);
		}
		return mapPrarm;
	}


	/**
	 * 判斷字符串中是否包含字符串和字母的情況
	 * 都爲數字返回true
	 * 包含數字和字符或都是字符返回false
     * 來自網絡
	 * @param str
	 * @return
	 */
	public static boolean letterOrNum(String str){
		boolean isDigit = false;//定義一個boolean值，用來表示是否包含數字
		boolean isLetter = false;//定義一個boolean值，用來表示是否包含字母
		for(int i=0 ; i<str.length() ; i++){ //循環遍歷字符串
			if(Character.isDigit(str.charAt(i))){     //用char包裝類中的判斷數字的方法判斷每一個字符
				isDigit = true;
			}
			if(Character.isLetter(str.charAt(i))){   //用char包裝類中的判斷字母的方法判斷每一個字符
				isLetter = true;
			}
		}
		if(isDigit && (!isLetter)){
			return true;
		}else{
			return false;
		}
	}

	}

測試下，前端頁面寫個簡單的請求，對象中包含三種結構的數據，如下所示：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

</head>
<body>
<button onclick="test()" >測試</button>
</body>
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<script>
    let data = {
        "name": "張某某",
        "age": "15",
        "address": {
            "city": "黑龍江",
            "country": "中國"
        },
        "another": [
            {
                "name": "操作手冊",
                "property": "中文"
            },
            {
                "name": "簡介文檔",
                "property": "概括"
            }
        ]
    }
    function test(){
        $.post("http://localhost:8088/test/jsm",data,function(result){
            alert("success")
        });
}
</script>
</html>

後臺測試打印：

    @Override
    public Object jsm(HttpServletRequest request) {
        //獲得的Map
        Map<String, Object> map = RequestUtils.getMap(request);
        System.out.println("Map: "+ map);
        //獲得Map中的成員Map
        Map address = (Map) map.get("address");
        System.out.println("成員Map: "+ address);
        //獲得Map中的成員List<Map>
        List another = (List) map.get("another");
        System.out.println("成員List<Map>: "+ another);
        return "";
    }

控制檯輸出結果：

Map: {address={country=中國, city=黑龍江}, another=[{name=操作手冊, property=中文}, {name=簡介文檔, property=概括}], name=張某某, age=15}
成員Map: {country=中國, city=黑龍江}
成員List<Map>: [{name=操作手冊, property=中文}, {name=簡介文檔, property=概括}]

綜上所屬，可以拿來就用。

但功能還未完善，以後有需求在修改。