版权声明

万能实体类可以少写一些代码,挺方便的一个工具包 本作品采用知识共享署名 4.0 国际许可协议进行许可。 版权声明:本文由 低调小熊猫 发表于 低调小熊猫的博客 转载声明:自由转载-非商用-非衍生-保持署名,非商业转载请注明作者及出处,商业转载请联系作者本人qq:2696284032 文章链接:https://aodeng.cc/archives/javazdwnstl

代码

package com.account.web.vo.base;

import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import com.account.core.util.DateUtil;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
@SuppressWarnings({ "rawtypes", "unchecked" })
public class PageData extends HashMap implements Map{
	
	private static final long serialVersionUID = 1L;
	
	Map map = null;
	HttpServletRequest request;
	
	public PageData(HttpServletRequest request){
		this.request = request;
		Map properties = request.getParameterMap();
		Map returnMap = new HashMap(); 
		Iterator entries = properties.entrySet().iterator(); 
		Map.Entry entry; 
		String name = "";  
		String value = "";  
		while (entries.hasNext()) {
			entry = (Map.Entry) entries.next(); 
			name = (String) entry.getKey(); 
			Object valueObj = entry.getValue(); 
			if(null == valueObj){ 
				value = ""; 
			}else if(valueObj instanceof String[]){ 
				String[] values = (String[])valueObj;
				for(int i=0;i<values.length;i++){ 
					 value = values[i] + ",";
				}
				value = value.substring(0, value.length()-1); 
			}else{
				value = valueObj.toString(); 
			}
			returnMap.put(name, value); 
		}
		map = returnMap;
	}
	
	public PageData() {
		map = new HashMap();
	}
	
	@Override
	public Object get(Object key) {
		Object obj = null;
		if(map.get(key) instanceof Object[]) {
			Object[] arr = (Object[])map.get(key);
			obj = request == null ? arr:(request.getParameter((String)key) == null ? arr:arr[0]);
		} else {
			obj = map.get(key);
		}
		return obj;
	}
	
	public String getString(Object key) {
		if(null==key){
			return "";
		}
		Object v = get(key);
		if(null==v){
			return "";
		}
		return v.toString();
	}
	public Integer getInt(Object key) {
		if (null == key) {
			return null;
		}
		Object v = get(key);
		if (null == v) {
			return null;
		}
		return (int) Double.parseDouble(v.toString());
	}

	public Long getLong(Object key) {
		if (null == key) {
			return null;
		}
		Object v = get(key);
		if (null == v) {
			return null;
		}
		return Long.parseLong(v.toString());
	}

	public Double getDouble(Object key) {
		if (null == key) {
			return null;
		}
		Object v = get(key);
		if (null == v) {
			return null;
		}
		return Double.parseDouble(v.toString());
	}

	public Date getDate(Object key) {
		if (null == key) {
			return null;
		}
		Object v = get(key);
		if (null == v) {
			return null;
		}
		return DateUtil.fomatDate(v.toString());
	}
	@Override
	public Object put(Object key, Object value) {
		return map.put(key, value);
	}
	
	@Override
	public Object remove(Object key) {
		return map.remove(key);
	}

	public void clear() {
		map.clear();
	}

	public boolean containsKey(Object key) {
		// TODO Auto-generated method stub
		return map.containsKey(key);
	}

	public boolean containsValue(Object value) {
		// TODO Auto-generated method stub
		return map.containsValue(value);
	}

	public Set entrySet() {
		// TODO Auto-generated method stub
		return map.entrySet();
	}

	public boolean isEmpty() {
		// TODO Auto-generated method stub
		return map.isEmpty();
	}

	public Set keySet() {
		// TODO Auto-generated method stub
		return map.keySet();
	}

	public void putAll(Map t) {
		// TODO Auto-generated method stub
		map.putAll(t);
	}

	public int size() {
		// TODO Auto-generated method stub
		return map.size();
	}

	public Collection values() {
		// TODO Auto-generated method stub
		return map.values();
	}

	public static String toListString(List<PageData> list) {
		JSONArray ja = new JSONArray();
		for (PageData new_pd : list) {
			ja.add(JSONObject.fromObject(new_pd));
		}
		return ja.toString();
	}
}

使用方法

额,最近看到留言不知道怎么使用,补充一下使用方法 java中的代码

List<PageData> list = new ArrayList<PageData>();
			for (String buttonId : buttonIds) {
				PageData vo = new PageData();
				vo.put("roleId",roleId);
				vo.put("buttonId",buttonId);
				list.add(vo);
			}
			sqlSessionTemplate.insert("SysRoleRightsMapper.saveButtons", list);

mybatis中的代码

<insert id="saveButtons">
		INSERT INTO sys_role_rights_button (
		roleId,
		buttonId
		) VALUES 
		<foreach item="item" index="index" collection="list" open="" separator="," close="">
          		(
				#{item.roleId},
				#{item.buttonId}
				)
		</foreach>
	</insert>

就是一个key-value形式的实体类,使用很方便