Ajax获取服务器数据乱码

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今天学习Ajax时，获取服务器数据出现乱码，找了半天才发现是将

resp.setContentType("text/plain;charset=utf-8");

中的“;”写成了“:”,特此记录，提醒自己以后不要粗心大意。

以下附上源码：index.jsp

<%--  Created by IntelliJ IDEA.  User: hadoop  Date: 2016/4/20  Time: 15:08  To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" pageEncoding="utf-8" %><%%><html><head lang="en">    <meta charset="UTF-8">    <title>测试</title>    <script language="JavaScript">        function ok()        {            var xmlhttp;            if (window.XMLHttpRequest)            {// code for Firefox, Opera, IE7, etc.                xmlhttp=new XMLHttpRequest();            }            else if (window.ActiveXObject)            {// code for IE6, IE5                try{                    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");                }catch(e){                    xmlhttp=new ActiveXObject("Msxml2.XMLHTTP");                }            }            xmlhttp.onreadystatechange = function () {                if(4 == xmlhttp.readyState) {                    if(200 == xmlhttp.status) {                        var msgWelcome = xmlhttp.responseText;                        var msg = document.getElementById("msg");                        msg.innerHTML = msgWelcome;                    }                }            }            xmlhttp.open("get","http://localhost/myHelloWorld.do",true);            xmlhttp.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');            xmlhttp.send(null);        }    </script></head><body>    <span id="msg"></span><br>    <input type="button" onclick="ok()" value="单机此按钮"></body></html>

HelloWorldOld.java

package com.count.Online;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.io.PrintWriter;import java.text.SimpleDateFormat;import java.util.Date;/** * Created by root on 2016/9/6. */public class HelloWorldOld extends HttpServlet{    @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        resp.setContentType("text/plain;charset=utf-8");        PrintWriter out = resp.getWriter();        out.println("现在时间是：" + getCuttentDateAndTime() + " 欢迎您（Hello-World）");    }    public String getCuttentDateAndTime() {        String currentDate = "";        SimpleDateFormat format1 = new SimpleDateFormat("yyyy'-'MM'-'dd HH:mm:ss");        format1.setLenient(false);        currentDate = format1.format(new Date());        return currentDate;    }}

web.xml代码片段

    <servlet>        <servlet-name>Servlet</servlet-name>        <servlet-class>com.count.Online.HelloWorldOld</servlet-class>    </servlet>    <servlet-mapping>        <servlet-name>Servlet</servlet-name>        <url-pattern>*.do</url-pattern>    </servlet-mapping>

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