Ticket封裝成一個類

package com.model;
public class Ticket {
    private int ticket_id;
    private int price;
    private int user_id;
    private int sit_num;
    private String from_sp;
    private String to_sp;
    private String time_leave;
    private String time_arrive;
    private String date;
    public
 
 int getTicket_id() {
        return ticket_id;
    }
    public void setTicket_id(int ticket_id) {
        this.ticket_id = ticket_id;
    }
    public int getPrice() {
        return price;
    }
    public void setPrice(int price) {
        this.price = price;
    }
    public int getUser_id() {
        return
 
 user_id;
    }
    public void setUser_id(int user_id) {
        this.user_id = user_id;
    }
    public int getSit_num() {
        return sit_num;
    }
    public void setSit_num(int sit_num) {
        this.sit_num = sit_num;
    }
    public String getFrom_sp() {
        return from_sp;
    }
    public
 
 void setFrom_sp(String from_sp) {
        this.from_sp = from_sp;
    }
    public String getTo_sp() {
        return to_sp;
    }
    public void setTo_sp(String to_sp) {
        this.to_sp = to_sp;
    }
    public String getTime_leave() {
        return time_leave;
    }
    public void setTime_leave(String time_leave) {
        this.time_leave = time_leave;
    }
    public String getDate() {
        return date;
    }
    public void setDate(String date) {
        this.date = date;
    }
    public String getTime_arrive() {
        return time_arrive;
    }
    public void setTime_arrive(String time_arrive) {
        this.time_arrive = time_arrive;
    }

}

資料庫連線程式碼

package com.conn;
import java.sql.DriverManager;
import com.mysql.jdbc.Connection;
public class Conn {
    private String url = "jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8";
    private String user = "root";
    private String pass = "";
    public Connection getConn(){
        try{
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = (Connection) DriverManager.getConnection(url, user, pass);
            return conn;
        }catch(Exception e){
            e.printStackTrace();
            return null;
        }   
    }
}

編寫TicketDAO類

package com.conn;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
public class TicketDAO {
   private Connection conn;
   private PreparedStatement pstmt;
   private ArrayList<com.model.Ticket> list = new ArrayList<com.model.Ticket>();
   public TicketDAO(){
       conn = new Conn().getConn();
   }
   public ArrayList<com.model.Ticket> findTicket(int user_id){
    try {
        pstmt = conn.prepareStatement("select * from buy_ticket where user_id=?");
        pstmt.setInt(1,user_id);
        ResultSet rs = pstmt.executeQuery();
        while(rs.next()){
            com.model.Ticket ticket = new com.model.Ticket();
            ticket.setDate(rs.getString("date"));
            ticket.setSit_num(rs.getInt("sit_num"));
            ticket.setUser_id(rs.getInt("user_id"));
            ticket.setPrice(rs.getInt("price"));
            ticket.setTime_leave(rs.getString("time_leave"));
            ticket.setTime_arrive(rs.getString("time_arrive"));
            ticket.setTo_sp(rs.getString("to_sp"));
            ticket.setFrom_sp(rs.getString("from_sp"));
            ticket.setTicket_id(rs.getInt("ticket_id"));
            list.add(ticket);
        }
        return list;
    } catch (SQLException e) {
        e.printStackTrace();
        return null;
    }   
   }
   public boolean addTicket(int user_id,int p_id){
       try {
        pstmt = conn.prepareStatement("insert into buy_ticket (from_sp,to_sp,time_arrive,time_leave,price,user_id,sit_num,date) "
                + "select from_sp,to_sp,time_arrive,time_leave,price,'"+user_id+"',car.number-price.rest+1,date from "
                        + "price natural join time_table natural join car where price.p_id =?");
        pstmt.setInt(1, p_id);
        int rs = pstmt.executeUpdate();
        if(rs>0){
            pstmt = conn.prepareStatement("update price set rest = rest-1 where p_id = ?");
            pstmt.setInt(1, p_id);
            pstmt.executeUpdate();
            return true;
        }else{
            return false;
        }

    } catch (SQLException e) {
        e.printStackTrace();
           return false;
    }

   }
}

Ticket Action類

這個類是關鍵，接收Android端的資料與接收web傳來的資料一樣，返回資料以JSON資料包返回。在Action類中需要呼叫ServletAPI來進行響應請求

package com.user.service;
import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONArray;
import net.sf.json.util.JSONStringer;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import com.conn.TicketDAO;
import com.opensymphony.xwork2.ActionSupport;
public class Ticket extends ActionSupport implements ServletRequestAware,ServletResponseAware{
    private static final long serialVersionUID = 1L;
    private HttpServletRequest request;
    private HttpServletResponse response;
    private int user_id;
    private int p_id;
    public void setServletRequest(HttpServletRequest request) { 
        this.setRequest(request);
    }
    public void setServletResponse(HttpServletResponse response) {
        this.setResponse(response);
    }
    public int getUser_id() {
        return user_id;
    }
    public void setUser_id(int user_id) {
        this.user_id = user_id;
    }
    public HttpServletRequest getRequest() {
        return request;
    }
    public void setRequest(HttpServletRequest request) {
        this.request = request;
    }
    public HttpServletResponse getResponse() {
        return response;
    }
    public void setResponse(HttpServletResponse response) {
        this.response = response;
    }
    public int getP_id() {
        return p_id;
    }
    public void setP_id(int p_id) {
        this.p_id = p_id;
    }
    public void findTicket(){
        ArrayList<com.model.Ticket> list = new ArrayList<com.model.Ticket>();
        TicketDAO ticketDAO = new TicketDAO();
        list = ticketDAO.findTicket(getUser_id());
        //將ArrayList物件轉換成JSON資料
        JSONArray json = JSONArray.fromObject(list);
        //防止中文亂碼
        response.setContentType("text/html;charset=utf-8");
        try {
        //將後臺資料返回安卓端
            this.response.getWriter().write(json.toString());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public void addTicket(){
        TicketDAO ticketDAO = new TicketDAO();
        boolean result = ticketDAO.addTicket(getUser_id(),getP_id());
        response.setContentType("text/html;charset=utf-8");
        JSONStringer stringer = new JSONStringer();
        if(result){
            String str = stringer.object().key("value").value(1).endObject().toString();
            try {
                this.response.getWriter().write(str);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }else{
            String str = stringer.object().key("value").value(0).endObject().toString();
            try {
                this.response.getWriter().write(str);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }


}

Struts.xml檔案的配置

package 必須繼承json-default
result 返回的型別為json

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="user" extends="json-default">
   <action name="addUser" class="com.user.service.AddUser" method="add">
    <result type="json"></result>
    </action>
  <action name="userLogin" class="com.user.service.AddUser" method="find">
    <result type="json"></result>
  </action>
  <action name="findTimePrice" class="com.user.service.Timeprice" method="find">
    <result type="json"></result>
  </action>
  <action name="findTicket" class="com.user.service.Ticket" method="findTicket">
    <result type="json"></result>
  </action>
  <action name="addTicket" class="com.user.service.Ticket" method="addTicket">
    <result type="json"></result>
  </action>
</package>
</struts>

專案部署後，在瀏覽器中可以看到測試結果

Java物件轉換成JSON物件

主要有JSONArray JSONObject JSONStinger

package jsonDemo;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.util.JSONStringer;
public class Demo1 {
    private String name;
    private int id;
    private ArrayList<?> list;
    public static void main(String [] args){
        //普通型別、List、Collection等都是用JSONArray解析
        //普通陣列
        String[] list = new String[]{"one","two","three"};
        JSONArray jsonArray = JSONArray.fromObject(list);   
        System.out.println(jsonArray.toString());//["one","two","three"]

        //List
        List<String> list1 = new ArrayList<String>();
        list1.add("one");
        list1.add("two");
        list1.add("three");
        JSONArray jsonArray1 = JSONArray.fromObject(list1);
        System.out.println(jsonArray1.toString());//["one","two","three"]

        //Map
        Map<String, String> params =  new HashMap<String, String>();
        params.put("username", "lcy");
        params.put("user_json", "scau");
        JSONArray array = JSONArray.fromObject(params);
        System.out.println(array.toString());//[{"username":"lcy","user_json":"scau"}]
        JSONObject jsonObject = JSONObject.fromObject( params );
        System.out.println(jsonObject.toString());//{"username":"lcy","user_json":"scau"}
        //Map也可以理解成一個物件,也可以使用JSONObject來解析

        //普通自定義型別,使用JSONObject
        Demo1 demo1 = new Demo1();
        demo1.setId(123);
        demo1.setName("lcy");
        demo1.setList(list1);
        JSONObject jsonDemo1 = JSONObject.fromObject(demo1);
        System.out.println(jsonDemo1.toString());//{"id":123,"list":["one","two","three"],"name":"lcy"}

        //使用JSONStringer構造一個json資料
        JSONStringer stringer = new JSONStringer();
        String str = stringer.object().key("name").value("lcy").key("id").value(1).endObject().toString();//要使用enObject()作為結尾
        System.out.println(str);//{"name":"lcy","id":1}


    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public ArrayList<?> getList() {
        return list;
    }

    public void setList(List<String> list1) {
        this.list = (ArrayList<?>) list1;
    }


}