[求助]ajax+servlet中文乱码，请您帮忙

1. protected void doGet(HttpServletRequest httpServletRequest,
2. HttpServletResponse httpServletResponse) throws ServletException,
3. IOException {
4. httpServletResponse.setContentType("text/xml;charset=GB2312");
5. httpServletRequest.setCharacterEncoding("GB2312");
6. //httpServletResponse.setCharacterEncoding("UTF-8");
7. //String song = httpServletRequest.getParameter("song");
8. //String song= new String(httpServletRequest.getParameter("song").getBytes("ISO-8859-1"), "GB2312");
9. //String singer =new String(httpServletRequest.getParameter("singer").getBytes("ISO-8859-1"), "GB2312");
10. String song = httpServletRequest.getParameter("song");
11. String singer = httpServletRequest.getParameter("singer");
12. System.out.println("Song name:"+song +"\n singer "+singer+"\n");
13. String resp = null;
14. if (!song.equals("")) {
15. URL songUrl = new URL(baiduUrl+song+"$$"+singer+"$$$$");
16. HttpURLConnection songCon = (HttpURLConnection) songUrl
17. .openConnection();
18. songCon.setRequestMethod("GET");
19. songCon.setDoInput(true);
20. songCon.connect();
22. BufferedReader in = new BufferedReader(new InputStreamReader(
23. songCon.getInputStream()));
24. StringBuffer buf = new StringBuffer("");
25. String inputLine;
26. while ((ininputLine = in.readLine( )) != null) {
27. buf.append(inputLine); }
28. in.close( );
29. resp = buf.toString( );
30. System.out.println("#######################");
31. System.out.println(resp);
32. System.out.println("#######################\n");
33. try{
34. getAddress(resp);
35. resp="<songaddr>"+this.getSongAddr()+"</songaddr><wordaddr>"+this.getWordAddr()+"</wordaddr>";
36. //System.out.println("_________________"+resp+"\n");
38. }catch(ParserConfigurationException e){
39. e.printStackTrace();
40. }
42. }else{
43. resp="<error />";
45. }
46. //httpServletResponse.setContentType("text/xml; charset=UTF-8");
47. //Convey to the user agent or browser that it should
48. //not cache the responses
49. // httpServletResponse.setHeader("Cache-Control", "no-cache");
50. // httpServletResponse.getWriter( ).write(resp);
52. httpServletResponse.setContentType("text/xml; charset=GB2312");
53. 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>";
54. System.out.println("*******************\n");
55. System.out.println(content);
56. System.out.println("*******************\n");
57. httpServletResponse.getWriter( ).write(content);
59. }
    

可是总是出现乱码现象，比如：
Song name:???
singer
我所有文件的存储encoding都是采用gb2312，编译servlet也采用了javac -encoding gb2312 *.java.
在tomcatweb.xml配置如下：

1. <?xml version="1.0" encoding="GB2312"?>
2. <web-app version="2.4"
3. xmlns="http://java.sun.com/xml/ns/j2ee"
4. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
5. xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
6. http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
8. <!-- General description of your web application -->
9. <display-name>Echo Servlet</display-name>
10. <description>
11. Bai du songs
12. </description>
13. <jsp-config>
14. <jsp-property-group>
15. <description>Special property group for JSP Configuration JSP example.</description>
16. <display-name>JSPConfiguration</display-name>
17. <url-pattern>*.jsp</url-pattern>
18. <el-ignored>true</el-ignored>
19. <page-encoding>GB2312</page-encoding>
20. <scripting-invalid>false</scripting-invalid>
21. <include-prelude></include-prelude>
22. <include-coda></include-coda>
23. </jsp-property-group>
24. </jsp-config>
26. <!-- define servlets and mapping -->
27. <servlet>
28. <servlet-name>SongSearch</servlet-name>
29. <servlet-class>baidu.SongSearch</servlet-class>
30. </servlet>
31. <servlet-mapping>
32. <servlet-name>SongSearch</servlet-name>
33. <url-pattern>/songsearch</url-pattern>
34. </servlet-mapping>
35. </web-app>