日期:2014-05-16  浏览次数:20714 次

Ajax基础+Ajax开发中的编码问题

·-- 首先开发中要注意的一个问题,这个问题困扰我好几个小时,编码问题。

如果在Servlet进行如下设置时:

???????????????????? resp.setContentType("text/xml;charset=UTF-8");
??? ???? resp.setCharacterEncoding("UTF-8");

IE8和火狐时没有问题的,但是换成如下形式,

???????????????????? resp.setContentType("text/xml;charset=UTF-8");
??? ???????????????? resp.setCharacterEncoding("GBK");

或者
???????????????????? resp.setContentType("text/xml;charset=GBK");
??? ???????????????? resp.setCharacterEncoding("GBK");

时,会出现的现象是火狐操作正常,IE操作不正常。原理暂时不清楚,等待高手指点。

1、新建一个Servlet

package com.sunrex.servlet;

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;

@SuppressWarnings("serial")
public class AjaxServlet extends HttpServlet {

	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		
		resp.setContentType("text/xml;charset=UTF-8");
		resp.setCharacterEncoding("UTF-8");
		resp.setHeader("Cache-Control", "no-cache");
		StringBuffer sb = new StringBuffer();
		sb.append("<nation>");
			sb.append("<detail>");
				sb.append("<address>").append("中国").append("</address>");
				sb.append("<city>").append("上海").append("</city>");
			sb.append("</detail>");
			
			sb.append("<detail>");
				sb.append("<address>").append("美国").append("</address>");
				sb.append("<city>").append("纽约").append("</city>");
			sb.append("</detail>");
			
			sb.append("<detail>");
				sb.append("<address>").append("日本").append("</address>");
				sb.append("<city>").append("东京").append("</city>");
			sb.append("</detail>");
		sb.append("</nation>");
		System.out.println(sb.toString());
		PrintWriter out = resp.getWriter();
		out.write(sb.toString());
		out.close();
	}
}

?

2、配置web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
	xmlns="http://java.sun.com/xml/ns/j2ee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <servlet>
  	<servlet-name>ajax</servlet-name>
  	<servlet-class>com.sunrex.servlet.AjaxServlet</servlet-class>
  </servlet>
  <servlet-mapping>
  	<servlet-name>ajax</servlet-name>
  	<url-pattern>/servlet/ajax</url-pattern>
  </servlet-mapping>  
</web-app>

?

3、jsp文件

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Insert title here</title>
<script type="text/javascript">
	var xmlHttp;
	function createXMLHTTP() {
		if(window.XMLHttpRequest) {
			xmlHttp = new XMLHttpRequest();
		} else if(window.ActiveXObject) {
			xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
		}
	}

	function show() {
		
		createXMLHTTP();
		var url = "servlet/ajax";
		xmlHttp.open("GET", url);
		xmlHttp.onreadystatechange = callback;
		xmlHttp.send(null);
	}
	
	function callback() {
		if(xmlHttp.readyState == 4) {
			if(xmlHttp.status == 200) {
				var xmlText = xmlHttp.responseXML.getElementsByTagName("nation")[0];
				var childrenNodes = xmlText.childNodes;
				var nodeLength = childrenNodes.length;
				var tables = "<table border='1'>";
				for(var