JSON: JavaScript Object Notation(JavaScript 對象表示法)javascript
JSON 是存儲和交換文本信息的語法。相似 XML。css
JSON 比 XML 更小、更快,更易解析。html
JSON 文本格式在語法上與建立 JavaScript 對象的代碼相同。java
因爲這種類似性,無需解析器,JavaScript 程序可以使用內建的 eval() 函數,用 JSON 數據來生成原生的 JavaScript 對象。sql
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; }; }
import java.util.List; import org.json.JSONObject; public interface Dao { public boolean insertDate(Student stu); public List<JSONObject> selectAll(); }
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; } }
<!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="js/student3.js"></script> </head> <body> <!-- json表單註冊 -->> <form action="" method="post"></form> 編號:<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> <!-- 讀取數據 --> <input type="button" onclick="insertStu()" value="獲取信息"> <table border="1px" width="100%" align="center"> <thead><tr> <th>學號</th> <th>姓名</th> <th>住址</th> </tr></thead> <tbody id="main" align="center"> </tbody> </table> </body> </html>
//瀏覽器協議 var xmlHttp; function creatXMLHttpRequest(){ if(window.XMLHttpRequest){ xmlHttp=new XMLHttpRequest(); }else if(window.ActiveXObject){ xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); } } //觸發函數 function insertStu(){ //向瀏覽器發出異步請求 creatXMLHttpRequest(); //獲取表單數據 var number=document.getElementById("number").value; var name=document.getElementById("name").value; var address=document.getElementById("address").value; //若將多個表單數據轉換成json格式,前提先把這些數據存儲到js的對象中 var jsObject=new fromObject(number,name,address); //將對象轉換成JSON格式的數據 json=JSON.stringify(jsObject); alert(json); //開啓對服務器端的鏈接 var url="insertServlet"; xmlHttp.open("post", url, true); //向服務器發送請求,將json格式的數據傳輸到servlet中 xmlHttp.send(json); //回調匿名函數,接受服務器傳來的數據 xmlHttp.onreadystatechange=function (){ //判斷服務器響應狀態和請求狀態 200表示響應ok 4表示請求完成 alert("1"); if(xmlHttp.status==200 && xmlHttp.readyState==4){ var msg=xmlHttp.responseText; //javascript可以使用內置的eval()函數生成javascript對象 var stus=eval("("+msg+")"); tbody=document.getElementById("main"); for ( var i = 0; i < stus.length; i++) { var stu = stus[i]; alert(stu.name); var tr=document.createElement("tr"); var td1=document.createElement("td"); td1.innerHTML=stu.number; //td1.appendChild(document.createTextNode(stu.number)); tr.appendChild(td1); var td2=document.createElement("td"); //td2.appendChild(document.createTextNode(stu.name)); td2.innerHTML=stu.name; tr.appendChild(td2); var td3=document.createElement("td"); //td3.appendChild(document.createTextNode(stu.address)); td3.innerHTML=stu.address; tr.appendChild(td3); tbody.appendChild(tr); } } }; } //至關於咱們的實體類,轉化js對象時調用 function fromObject(number,name,address){ this.number=number; this.name=name; this.address=address; }
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"); //建立帶有緩衝區的字符串對象jsn,用來存儲讀取到的json StringBuffer jsn=new StringBuffer(); //用io流的方式讀取js頁面傳過來的對象json BufferedReader br=request.getReader(); String line=null; while((line=br.readLine())!=null){ jsn.append(line); } //拆分json表單中的數據 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(); //轉換成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(); } }