Gson+Struts2 例子

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@Controllerpublic class GsonAction extends ActionSupport { @Resource private IUserDao iud; private Users user; public Users getUser() { return user; } public void setUser(Users user) { this.user = user; } public String execute() { Integer uid = user.getUserid();// 获取JSP页面中select列表的传递过来的用户ID this.user = iud.findById(uid);// 根据用户的ID获取用户实体 Gson gson = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create(); String res = gson.toJson(this.user); HttpServletResponse response = ServletActionContext.getResponse(); response.setContentType("application/json;charset=utf-8"); try { PrintWriter out = response.getWriter(); out.print(res); out.close(); } catch (IOException e) { e.printStackTrace(); } return null; }}

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JSP 页面部分代码（使用jQuery）：

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function getgsoninfo() { var val = $("#person").val();//获取选中的用户ID $.ajax( {  type:"post",  url : "gsonaction.action",//action的地址  data : "user.userid=" + val,  success : function(data) {   alert(data.username);//弹出用户名,data为返回的user实体  } });}