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Cookie cookie=new Cookie("name", "hello"); 

response.addCookie(cookie);

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Cookie[] cookies=request.getCookies(); 

for(int i=0;i<cookies.length;i++){ 

if(cookies[i].getName().toString().equals("name")){ 

out.print(cookies[i].getValue()); 

} 

}

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request.getSession().setAttribute("name", name); 

request.getSession().setMaxInactiveInterval(2); 

response.sendRedirect("welcome.jsp"); 

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Object user=request.getSession().getAttribute("name");

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request.setAttribute("name", "cute"); 

request.getRequestDispatcher("welcome.jsp").forward(request, response);  //網址不會改變

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String name=request.getAttribute("name").toString(); 

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public class TestServlet extends HttpServlet { 

/**

* Constructor of the object.

*/ 

public TestServlet() { 

super(); 

} 

public void doGet(HttpServletRequest request, HttpServletResponse response) 

throws ServletException, IOException { 

doPost(request, response); 

} 

public void doPost(HttpServletRequest request, HttpServletResponse response) 

throws ServletException, IOException { 

response.setContentType("text/html"); 

PrintWriter out = response.getWriter(); 

String data="[{\"name\":\"apple\",\"price\":23},{\"name\":\"banana\",\"price\":12},{\"name\":\"orange\",\"price\":8}]"; 

out.write(data); 

out.flush(); 

out.close(); 

} 

/**

* Initialization of the servlet. <br>

*

* @throws ServletException if an error occurs

*/ 

public void init() throws ServletException { 

// Put your code here 

} 

} 

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function createXMLHttpRequest(){ 

var xmlrequest; 

if(window.XMLHttpRequest){ 

xmlrequest=new XMLHttpRequest(); 

}else if(window.ActiveXObject){ 

try{ 

xmlrequest=new ActiveXObject("Msxm12.XMLHTTP"); 

}catch(e){ 

try{ 

xmlrequest=new ActiveXObject("Microsoft.XMLHTTP"); 

}catch(e){ 

xmlrequest=""; 

} 

} 

} 

return xmlrequest; 

} 

//獲取資料的函式 

function change(){ 

var xmlrequest=createXMLHttpRequest(); 

xmlrequest.open("POST","TestServlet",true); 

xmlrequest.onreadystatechange=function(){ 

if(xmlrequest.readyState==4&&xmlrequest.status==200){ 

var data=JSON.parse(xmlrequest.responseText); 

var content="<table border=1>"; 

for(var i=0;i<data.length;i++){ 

content+="<tr>"; 

for(o in data[i]){ 

content+="<td>"+data[i][o]+"</td>"; 

} 

content+="</tr>"; 

} 

content+="</table>"; 

document.getElementById("test").innerHTML=content; 

} 

}; 

xmlrequest.send(); 

}