利用getParameterNames兑现一个按钮所有模块数据都提交

1.总结：

 三个模块共用一个确定按钮！

页面如下：

<table class="form-table">
		<tr>
			<td class="label">
				主机：
			</td>
			<td>
				<input type="text"   name="emails.host" value="${emails.host}"/>
			</td>
		</tr>

		<tr>
			<td class="label">
				发信邮箱
			</td>
			<td>
				<input type="text" name="emails.username" value="${emails.username}"/>
			</td>
		</tr>
		
		<tr>
			<td class="label">
				密码：
			</td>
			<td>
			<input type="password" name="emails.password" value="${emails.password}"/>
			</td>
		</tr>
	</table>

public String save(){
		HttpServletRequest  request = ServletActionContext.getRequest();
		Enumeration<String> names = request.getParameterNames();
		     //request.getParameterNames()所返回的枚举Enumeration类
	Map<String,Map<String,String>> settings = new HashMap<String, Map<String,String>>();
		
	    while(names.hasMoreElements()){	
	    	String name= names.nextElement();
	    	String[]name_ar = name.split("\\.");
	    	  //name.split(regex) 如果有特殊符号，里面的string是正则表达式，需转义
	    	  //此处name为comments.pageSize，故以.分割，需转义
	    	  //分割后的name_ar为：[comments, pageSize]
	    	if(name_ar.length!=2) continue;
	    	
	    	String groupName = name_ar[0];
	    	String paramName  = name_ar[1];
	    	String paramValue = request.getParameter(name);
	    	
	    	Map<String,String> params = settings.get(groupName);
	    	if(params==null){
	    		params = new HashMap<String, String>();
	    		settings.put(groupName, params);
	    	}
	    	params.put(paramName, paramValue);
 
	    }	    
		settingService.save( settings );
		this.msgs.add("配置修改成功");
		this.urls.put("系统设置", "setting!edit_input.do");
		return this.MESSAGE;
	}

 数据库中数据如图：

Map<String,Map<String,String>> settings = new HashMap<String, Map<String,String>>();
Map<String,String> params = new HashMap<String, String>();

setting（Map类型）:
{photo={}, comments={pageSize=5}}
{emails={password=123456}, photo={watermark=off, marksize=12, detail_pic_width=350}, comments={pageSize=5, directShow=0}}

保存Setting到数据库：（作为Value的Map需转化为JSON类型数据后再插入数据库）
        public void save( Map<String,Map<String,String>> settings ) throws SettingRuntimeException {
		Iterator<String> settingkeyItor = settings.keySet().iterator(); 
		while ( settingkeyItor.hasNext() ) {			
			String settingKey = settingkeyItor.next();
			JSONObject jsonObject = JSONObject.fromObject( settings );
			
			this.daoSupport.execute("update settings set cfgvalue=? where cfg_group=?",jsonObject.toString(),settingKey);
		}	 
	}

 从数据库中读出数据并输出为Map类型：

public Map<String,Map<String ,String>>  getSetting() {
		String sql = "select * from settings";
		List<Map<String, String>> list = this.baseDaoSupport.queryForList(sql);
		Map<String,Map<String,String>> cfg = new HashMap();
		
		for (Map<String,String> map : list) {
			String setting_value = map.get("cfg_value");
			if(StringUtil.isEmpty(setting_value)){
				cfg.put( map.get("cfg_group"), new HashMap<String, String>());
			}else{
				JSONObject jsonObject = JSONObject.fromObject( setting_value );  
				Map itemMap = (Map)jsonObject.toBean(jsonObject, Map.class);
				cfg.put( map.get("cfg_group"), itemMap);
			}
		}
		return cfg;
	}

JSONObject.toBean(jsonObject,class):