ajax 異步請求，json前臺後臺交互
阿新 • • 發佈：2018-02-11
ioe exceptio servlet set 後臺 通過 int oid function
直接上例子！
第一例：
1.導入json的相關jar包
2.後臺servlet代碼
public class ajaxtest extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8");
//上面是處理亂碼的 String[] str= {"張三","李四","王五"}; //最普通的json數組結構 JSONArray json = JSONArray.fromObject(str); //string轉json結構 PrintWriter out = response.getWriter(); out.print(json); //response 將json輸出到客戶端。
}
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
前端jsp頁面
<script type="text/javascript" src="http://libs.cdnjs.net/jquery/3.2.1/jquery.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("#b01").click(function(){ $.getJSON("${pageContext.request.contextPath}/ajaxtest",function(result){ $.each(result,function(i,field){ $("#myDiv").append(field+":"); }); }); }); }); </script> </head> <body> <div id="myDiv"><h2>通過 AJAX 改變文本</h2></div> <button id="b01" type="button">改變內容</button>
點擊按鈕的結果：張三：李四：王五。
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第二例
ajax 異步請求，json前臺後臺交互