JSON: JavaScript Object Notation(JavaScript 对象表示法)
JSON 是存储和交换文本信息的语法。类似
JSON 比
JSON 文本格式在语法上与创建 JavaScript 对象的代码相同。
由于这种相似性,无需解析器,JavaScript 程序能够使用内建的 eval() 函数,用 JSON 数据来生成原生的 JavaScript 对象。
1.新建一个实体类(student).
public class Student { private int number; private String name; private String address; public Student(){} public Student(int number, String name, String address) { this.number = number; this.name = name; this.address = address; } public int getNumber() { return number; } public void setNumber(int number) { this.number = number; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; }; }
2.新建Dao接口,给出两个方法(向数据库添加数据和取出数据)。
import java.util.List;import org.json.JSONObject;public interface Dao { public boolean insertDate(Student stu); public List<JSONObject> selectAll();}
3.实现两个方法
import java.sql.Connection;import java.sql.ResultSet;import java.sql.SQLException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import org.json.JSONObject;import cn.com.yong.Dao.Dao;import cn.com.yong.Util.DBConnection;public class Student implements Dao { @Override public boolean insertDate(cn.com.yong.pro.Student stu) { Connection con=DBConnection.getDBConnectionInstance().getDBConnection(); String sql="insert into student (number,name,address) value(?,?,?)"; try { java.sql.PreparedStatement ps=con.prepareStatement(sql); ps.setInt(1, stu.getNumber()); ps.setString(2, stu.getName()); ps.setString(3, stu.getAddress()); int i=ps.executeUpdate(); if(i>0){ return true; } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return false; } @Override public List<JSONObject> selectAll() { Connection con=DBConnection.getDBConnectionInstance().getDBConnection(); List<JSONObject> list=new ArrayList<JSONObject>(); String sql="select number,name,address from student"; try { ResultSet rs=con.createStatement().executeQuery(sql); while(rs.next()){ Map<String, Object> map=new HashMap<String, Object>(); map.put("number", rs.getInt(1)); map.put("name",rs.getString(2)); map.put("address", rs.getString(3)); list.add(new JSONObject(map)); } } catch (SQLException e) { e.printStackTrace(); } return list; }}
4.新建用于表单提交的html文件(为方便提交和获取放在一块)。
<!DOCTYPE html><html> <head> <title>show3.html</title> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="this is my page"> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <!--<link rel="stylesheet" type="text/css" href="./styles.css">--> <script type="text/javascript" src='/images/loading.gif' data-original="js/student3.js"></script> </head> <body> <!-- json表单注册 -->> <form action="" method="post"></form> 编号:<input type="text" name="number" id="number"/><br> 姓名:<input type="text" name="name" id="name"/><br> 住址:<input type="text" name="address" id="address"/><br> <input type="button" value="提交" onclick="insertStu()"/> </form> <!-- 读取数据 --> <input type="button" onclick="insertStu()" value="获取信息"> <table border="1px" width="100%" align="center"> <thead><tr> <th>学号</th> <th>姓名</th> <th>住址</th> </tr></thead> <tbody id="main" align="center"> </tbody> </table> </body></html>
5.新建js文件
//浏览器协议var
6.Servlet
import java.io.BufferedReader;import java.io.IOException;import java.io.PrintWriter;import java.util.List;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.json.JSONArray;import org.json.JSONException;import org.json.JSONObject;import cn.com.yong.ImplementDao.Student;@WebServlet("/insertServlet")public class insertServlet extends HttpServlet { private static final long serialVersionUID = 1L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("-----------"); request.setCharacterEncoding("UTF-8"); //创建带有缓冲区的字符串对象jsn,用来存储读取到的json StringBuffer jsn=new StringBuffer(); //用io流的方式读取js页面传过来的对象json BufferedReader br=request.getReader(); String line=null; while((line=br.readLine())!=null){ jsn.append(line); } //拆分json表单中的数据 try { JSONObject jo=new JSONObject(jsn.toString()); int number=jo.getInt("number"); String name=jo.getString("name"); String address=jo.getString("address"); System.out.println(number+name+address); cn.com.yong.pro.Student st=new cn.com.yong.pro.Student(number, name, address); Student stu=new Student(); stu.insertDate(st); } catch (JSONException e) { e.printStackTrace(); } System.out.println("-------------------------------------------------------"); Student stu=new Student(); List<JSONObject> list=stu.selectAll(); //转换成jeson格式 JSONArray ja=new JSONArray(list); System.out.println(ja.toString()); response.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=UTF-8"); //以io流的方式返回 PrintWriter pw=response.getWriter(); pw.write(ja.toString()); pw.flush(); pw.close(); }}
原标题:JSON表单提交(ajax异步刷新)
关键词:JS