最近在写一个ajax音乐搜索的引擎。所以一直都被中文问题传输捆住了，弄了好半天，才有点眉目。却急切跟大家分享。
音乐搜索的用户操作界面：
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<%@ page contentType="text/html;charset=GB2312" language="java" %>
<%@page pageEncoding="GB2312"%>
<head>
<META http-equiv=Content-Type content="text/html; charset=GB2312">
</head>
<script type="text/javascript" src="js/baidusongs.js" ></script>
<script type="text/javascript" src="js/http_request.js"></script>
<title>Bai Du Songs</title>
<style type="text/css">
。。
<span class="STYLE2">Name of Song(歌名):</span>
<input name=
"song_name" type="text" id="song" value="You" size="20" maxlength="20" />
</p>
<p>
<span class="STYLE2">Name of Singer(歌手):</span>
<input type="text" id="singer" name=
"singer_value" size="20" maxlength="20" />
</p>
<p>
<!--<span id="addr_song"></span><br/>
<span id="addr_word"></span>-->
<div id = "addr_song"></div>
<div id = "addr_word"></div>
</p>
<p>
<button type="button" class="STYLE2" id="songsearch">Search</button>
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我把整个页面的编码设置成：gb2312, 网上有的资料说是统一用utf8格式，我自己试了一下，如果编码是utf8,那么需要把该文件存储成编码为utf-8的，否则也会出现页面乱码（错了吗？）。用户输入的参数由js来处理：
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window.onload = function(){
document.getElementById("songsearch").onclick=function(){
var _song= document.getElementById("song");
var _singer=document.getElementById("singer");
if(_song.value){
getSong(_song.value,_singer.value);
}
};
//defualt value
//getSong("等一分钟","");
};
function getSong(song,singer){
if(song == null){
document.getElementById("song").value="";
//return ;
}else{
var url = "http://localhost:8080/baidusongs/songsearch?song="+encodeURI(song)+"&singer="+encodeURI(singer)+"&timeStamp="+ new Date().getTime();
// var url = "http://localhost:8080/baidusongs/songsearch?song="+escape(song)+"&singer="+escape(singer)+"&timeStamp="+ new Date().getTime();
httpRequest("GET",url,true,handleResponse);
}
}
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查了很多资料，有的说是把song="+encodeURI(song)+"&singer="+encodeURI(singer）写成escape(song)这种形式的，我试了一下，发现这样根本无法把参数传送到servlet.不知道他们怎么弄得。没有搞明白......
数据传送到servlet,又遇到了编码的问题：
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protected void doGet(HttpServletRequest httpServletRequest,
HttpServletResponse httpServletResponse) throws ServletException,
IOException {
httpServletResponse.setContentType("text/xml;charset=GB2312");
httpServletRequest.setCharacterEncoding("GB2312");
//httpServletResponse.setCharacterEncoding("UTF-8");
//String song = httpServletRequest.getParameter("song");
//String song= new String(httpServletRequest.getParameter("song").getBytes("ISO-8859-1"), "GB2312");
//String singer =new String(httpServletRequest.getParameter("singer").getBytes("ISO-8859-1"), "GB2312");
String song = httpServletRequest.getParameter("song");
String singer = httpServletRequest.getParameter("singer");
System.out.println("Song name:"+song +"\n singer "+singer+"\n");
String resp = null;
if (!song.equals("")) {
URL songUrl = new URL(baiduUrl+song+"$$"+singer+"$$$$");
HttpURLConnection songCon = (HttpURLConnection) songUrl
.openConnection();
songCon.setRequestMethod("GET");
songCon.setDoInput(true);
songCon.connect();
BufferedReader in = new BufferedReader(new InputStreamReader(
songCon.getInputStream()));
StringBuffer buf = new StringBuffer("");
String inputLine;
while ((ininputLine = in.readLine( )) != null) {
buf.append(inputLine); }
in.close( );
resp = buf.toString( );
System.out.println("#######################");
System.out.println(resp);
System.out.println("#######################\n");
try{
getAddress(resp);
resp="<songaddr>"+this.getSongAddr()+"</songaddr><wordaddr>"+this.getWordAddr()+"</wordaddr>";
//System.out.println("_________________"+resp+"\n");
}catch(ParserConfigurationException e){
e.printStackTrace();
}
}else{
resp="<error />";
}
//httpServletResponse.setContentType("text/xml; charset=UTF-8");
//Convey to the user agent or browser that it should
//not cache the responses
// httpServletResponse.setHeader("Cache-Control", "no-cache");
// httpServletResponse.getWriter( ).write(resp);
httpServletResponse.setContentType("text/xml; charset=GB2312");
String content = "<?xml version=\"1.0\" encoding=\"GB2312\"?>"+"<baidu><address><song_addr>"+getRealSongAddr(this.getSongAddr(),this.getSongName())+"</song_addr>"+"<word_addr>"+getRealWordAddr(this.getWordAddr())+"</word_addr></address></baidu>";
System.out.println("*******************\n");
System.out.println(content);
System.out.println("*******************\n");
httpServletResponse.getWriter( ).write(content);
}
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httpServletRequest.setCharacterEncoding("GB2312");
String song = httpServletRequest.getParameter("song");
String singer = httpServletRequest.getParameter("singer");
我记得以前如果参数从jsp传到servlet这样写就可以了，不会乱码，可是这次就不行了。
后来我把它改成：
String song= new String(httpServletRequest.getParameter("song").getBytes("ISO-8859-1"), "GB2312");
String singer =new String(httpServletRequest.getParameter("singer").getBytes("ISO-8859-1"), "GB2312");
可是发现还是出现乱码，已经作转换了可是还是不行。我不知道具体的原因，难道是从页面送过来的参数不是gb2312编码的，也许是utf8的。
那就改成
String song= new String(httpServletRequest.getParameter("song").getBytes("ISO-8859-1"), "UTF8");
String singer =new String(httpServletRequest.getParameter("singer").getBytes("ISO-8859-1"), "UTF8");
没有想到这样就不会出现了乱码。
我在网上找到这样的例子：
http://hi.baidu.com/zbzb/blog/item/3afeafd37644ce34960a1658.html
servlet：
response.setContentType("text/xml");
//这个一定要设置，这里的设置应该跟HTML中的一样，但是我在这里
//用了 uft-8， 结果也是一样。
response.setCharacterEncoding("GB2312");
//当用POST方法时，一定要设置成utf-8，否则乱码
String firstName = new String(request.getParameter("firstName").getBytes("ISO-8859-1"), "utf-8");
//当用GET方法时，要设置成GB2312，否则乱码。
String lastName = new String(request.getParameter("lastName").getBytes("ISO-8859-1"), "GB2312");
我觉得，我的参数使用get方法传送的，可是gb2312确实乱码的，反utf-8显示正常。不知道这是怎么回事？有待细细考究。
