spring mvc框架下 后台往前台传送json数据

1.后台代码：

public String aas(HttpServletRequest request,HttpServletResponse response) JSONObject jo = new JSONObject();if(条件){                          jo.put("result","yes");                         }                  else{                          jo.put("result","yes");                          }PrintWriter pw = null;String data=jo.toString();try {              pw = response.getWriter();              pw.write(data);          } catch (IOException e) {              e.printStackTrace();          }finally{        pw.close();        } return null; }

2.前台代码：

$.ajax({        type: "POST",        url: "*****",                data:****,        success: function(data) {         var obj=eval("("+data+")");              if(obj.result="yes")                      {     }              else{                          }}