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