package servlet;import java.io.IOException;
import java.util.List;import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import model.User;
import service.UserService;@SuppressWarnings("serial")
@WebServlet(urlPatterns ="/user")
public class UserServlet extends HttpServlet {@Overridepublic void doPost(HttpServletRequest req, HttpServletResponse resp) {this.doGet(req, resp);}/* /* json    {"users":[{"id":1,"name":"mercy","age":22,"sex":3},{"id":2,"name":"lily","age":23,"sex":2},{"id":3,"name":"mily","age":23,"sex":3},{"id":4,"name":"lucy","age":25,"sex":3},{"id":5,"name":"john","age":24,"sex":2}],"total":6}*/@Overridepublic void doGet(HttpServletRequest req, HttpServletResponse resp) {UserService service=new UserService();String name=req.getParameter("name");int page=Integer.parseInt(req.getParameter("page"));int size=Integer.parseInt(req.getParameter("size"));byte sex=Byte.parseByte(req.getParameter("sex"));page=page-1;List<User> list=service.queryDataLimit(page, size, sex, name);long count=service.queryAll(sex, name);//build jsonStringBuilder builder=new StringBuilder("{\"users\":[");String results="";if(!list.isEmpty()) {for(User u:list) {String  result = "{\"id\":"+u.getId()+",\"name\":"+"\""+u.getName()+"\""+",\"age\":"+u.getAge()+",\"sex\":"+u.getSex()+"},";builder.append(result);}//get countresults=builder.toString();results=results.substring(0, results.length()-1)+"]";results=results+",\"total\":"+count+"}";}else {results="{\"users\":[],"+"\"total\":"+count+"}";}System.out.println(results);try {//set cross domainresp.setHeader("Access-Control-Allow-Origin", "*");resp.getWriter().write(results);} catch (IOException e) {e.printStackTrace();}}
}