将list集合转化json格式

将数据转化json格式 //将请求数据格式设为json resp.setContentType("text/json;charset = utf-8"); List lis = new ArrayList(); String in = req.getParameter("name"); Sp sp = new Sp(in); lis.add(sp); Gson gson = new Gson(); String ou = gson.toJson(lis); PrintWriter out = resp. getWriter(); out.write(ou); //HttpSession se = req.getSession(); //se.setAttribute("name", in); getWriter(); out.write(ou); //HttpSession se = req.getSession(); //se.setAttribute("name", in);