servlet后台怎样接收对象參数

主要思想是用js把对象转换成json。然后把json提交到后台去，后台把这个json字符串转换成map对象

<script type="text/javascript">
	function do_test()
	{
		var req = {};
		req['id'] = 1;
		req['name'] = '项羽';
		req['dynasty'] = '楚国';
		
		var info = {};
		info['nick'] = '西楚霸王';
		info['age'] = 47;
		
		var user1 = {};
		user1['userid'] = 100;
		user1['username'] = '英布';
		user1['position'] = '九江王';
		
		var user2 = {};
		user2['userid'] = 200;
		user2['username'] = '魏豹';
		user2['position'] = '西魏王';
		
		var user3 = {};
		user3['userid'] = 300;
		user3['username'] = '张耳';
		user3['position'] = '常山王';
		
		var list = [user1, user2, user3];
		
		req['info'] = info;
		req['list'] = list;
		
		var json = JSON.stringify(req);

		$.post('/leshop/home.do', {'reqInfos': json}, function(res){
			console.log(res);
		});	
	}
</script>

后台servlet端。直接用request.getParameter("reqInfos")，然后转换成对象

如Map<String, Object> map = g.fromJson(req.getParameter("reqInfos"), Map.class);

然后遍历这个对象就可以

map.get("list") 是ArrayList对象，这个ArrayList里面是Map