//创建一个学生pojo 类

/**
 * 这是一个关于学生的POJO类
 * 暂时不引入数据库
 * 只是一个假的数据库
 */

public class Student
{
 public int id;
 public String name;
 public String adress;
 
 public Student()
 {
  
 }
 
 public Student(int id,String name,String adress)
 {
  this.id = id;
  this.name = name;
  this.adress = adress;
 }

 public int getId()
 {
 return id;
 }

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

 public String getName()
 {
 return name;
 }

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

 public String getAdress()
 {
 return adress;
 }

 public void setAdress(String adress)
 {
 this.adress = adress;
 }

public class Db
{
 //创建一个本类的全局对象
 public static Db i = new Db();
 
 //使用链表写入数据
 private ArrayList stu = new ArrayList<>();
 
 private Db()
 {
 stu.add(new Student(20180001,"老王","北京"));
 stu.add(new Student(20180002,"老甄","邢台"));
 stu.add(new Student(20180003,"老高","邢台"));
 stu.add(new Student(20180004,"老孟","邯郸"));
 stu.add(new Student(20180005,"老裴","太原"));
 stu.add(new Student(20180006,"老李","东北"));
 stu.add(new Student(20180007,"老张","武汉"));
 stu.add(new Student(20180008,"老苗","重庆"));
 stu.add(new Student(20180009,"老郭","北京"));
 
 }
 
 //获取全部信息
 public ArrayList all()
 {
 return stu;
 }
 
 //按照学号查询
 public ArrayList byId(int from,int to)
 {
 ArrayList qStu = new ArrayList<>();
 for(int i=0;i

/**
*只需要更改doGet方法
*/
@WebServlet("/QueryAll")
public class QueryAll extends HttpServlet {

 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 
 ArrayList rows = Db.i.all();
 
 //转换成JSON格式
 JSONArray result = new JSONArray(rows);
 
 //返回数据
 response.setCharacterEncoding("UTF-8");
 response.setContentType("text/plain");
 Writer writer = response.getWriter();
 writer.write(result.toString(2));
 writer.close();
 }
 }

 
 
 
 
 
 
 
 
 

 查询
 

 

 

 

  
学号
  
姓名
  
住址
 
 
 

 
 
 
 

 现在没有数据