Ajax 解決中文亂碼問題

最後更新：2018-07-22 來源：互聯網

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CheckUserName.java的Servlet代碼如下:

package com.web;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CheckUserName extends HttpServlet {


   public void doGet(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {
       //HttpServletResponse.setContentType("text/html:charset=utf-8");
       request.setCharacterEncoding("utf-8");
       response.setCharacterEncoding("utf-8");
       PrintWriter out=response.getWriter();
       //擷取頁面參數
       String userName=request.getParameter("userName");
       //檢測參數是否與DB中相應資料相匹配
       if(userName==null||userName.length()==0){
           out.println("使用者名稱不可為空");
       }else{
           //校正操作
           if(userName.equals("tfq")){
               //返回頁面資料
               out.println("使用者名稱已經存在");
           }else{
               out.println("恭喜你!此使用者可用");
           }
       }

   }


   public void doPost(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {
       request.setCharacterEncoding("utf-8");
       response.setCharacterEncoding("utf-8");
       doGet(request, response);
   }

}

validata.js頁面代碼如下:

//驗證使用者是否存在
function validate() {

   // 1擷取文字框的內容
   // document.getElementById("userName"); dom的方式
   // Jquery的尋找節點的方式,參數中#加上id屬性值可以找到一個節點
   var obj = $("#userName");
   //解決中文亂碼 1:頁面端發出的資料作一次encodeURI(obj.val()),伺服器使用new String(userName.getBytes("iso8859-1","utf-8"))
   //解決中文亂碼 2:頁面端作兩次encodeURI(encodeURI(obj.val())),伺服器端用Strng userNamePara=URLDecoder.decode(userName,"utf-8");
   var userName = obj.val();
   //alert("userName: " + userName);
   // 2將擷取到的內容發送給伺服器的servlet
   // 調用jquery的XMLHTTPrequest對象get請求的封裝
   $.get("servlet/CheckUserName?userName=" + userName, null, function(data){
       // 3接收報務器返回的資料 4把返回的資料在div中顯示
       $("#showResult").html(data);
   });

}

checkUserName.html頁面代碼如下:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
      <title>My JSP 'checkUserName.jsp' starting page</title>

   <meta http-equiv="pragma" content="no-cache">
   <meta http-equiv="cache-control" content="no-cache">
   <meta http-equiv="expires" content="0">
   <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
   <meta http-equiv="description" content="This is my page">
   <script type="text/javascript" src="js/jquery-1.4.2.js"></script>
   <script type="text/javascript" src="js/validata.js" ></script>
</head>

<body>
    <center>
       <br />
       使用者名稱:<input type="text" id="userName" />
       <input type="button" value="校正" onclick="validate()" />
       <div id="showResult"></div>
    </center>
</body>
</html>

本文章原先以中文撰寫並發佈於 aliyun.com，亦設英文版本，僅作資訊用途。本網站不對文章的準確性，完整性或可靠性或其任何翻譯作出任何明示或暗示的陳述或保證。如對該文章有任何疑慮或投訴，請傳送電郵至 info-contact@alibabacloud.com 並提供相關疑慮或投訴的詳細說明。職員會於 5 個工作天內與您聯絡，一經驗證之後，即會刪除該侵權內容。

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