jsp:

function saveNames(){
		var rows = jQuery('#gzgi_DataGrid').datagrid('getSelections');
		if (rows == null || rows.length < 1) {
			alertGzgi('Info', '請選擇至少1條記錄!', 'info');
		} else {
			var datagrids = [];
			for(var i=0; i<rows.length; i++){
				datagrids.push({"model":rows[i].model,"machineType":rows[i].machineType,"option":rows[i].option,"yearstr":rows[i].yearstr}); 
			}
			if(datagrids.length != 0){
				var params = JSON.stringify(datagrids);  
			    var paramsData = {  
			    	params : params  
	            };  
				jQuery.ajax({
					   type: "",
					   url: '',
					   data: paramsData,
					   dataType:  'json',
					   ...
				 });
			}
		}
	}
 

java:

//獲取json字串
String params = request.getParameter("params");
//轉換資料成 list
List<CarType> carTypes = JSONArray.parseArray(params, CarType.class);