// 给客户端返回一个json对象
StringBuilder sb = new StringBuilder("{");
sb.append(""name"").append(":").append(user.getName());
sb.append(",");
sb.append(""gender"").append(":").append(user.getGender());
sb.append("}");
resp.getWriter().print(sb);
// 给客户端返回一个json对象
StringBuilder sb = new StringBuilder("{");
sb.append(""name"").append(":").append(user.getName());
sb.append(",");
sb.append(""gender"").append(":").append(user.getGender());
sb.append("}");
resp.getWriter().print(sb);