有一个字符数组的内容为:"student a am i",请你将数组的内容改为"i am a student".

String param = req.getParameter("name_startsWith");
try {
System.out.println("param1====="+new String(param.getBytes("ISO-8859-1"), "GBK"));
System.out.println("param2====="+new String(param.getBytes("ISO-8859-1"), "GB2312"));
System.out.println("param3====="+new String(param.getBytes("ISO-8859-1"), "UTF-8"));
System.out.println("param4====="+new String(param.getBytes("GB2312"), "ISO-8859-1"));
System.out.println("param5====="+new String(param.getBytes("GB2312"), "GBK"));
System.out.println("param6====="+new String(param.getBytes("GB2312"), "UTF-8"));
System.out.println("param7====="+new String(param.getBytes("GBK"), "ISO-8859-1"));
System.out.println("param8====="+new String(param.getBytes("GBK"), "UTF-8"));
System.out.println("param9====="+new String(param.getBytes("GBK"), "GB2312"));
System.out.println("param10====="+new String(param.getBytes("UTF-8"), "GBK"));
System.out.println("param11====="+new String(param.getBytes("UTF-8"), "GB2312"));
System.out.println("param12====="+new String(param.getBytes("UTF-8"), "ISO-8859-1"));
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

js与后台编码不一致，转换：

js代码：客户端对url进行两次转码（也可能是一次）：（str为中文）
参数及url（若是只需参数，就直接在js里面转参数就可以）

var url = 'policy.do?method=searchSuggest&word=' + str+"&now="+new Date().getTime();
url = encodeURI(url);
url = encodeURI(url);

servlet服务器段对参数值进行解码：

String word = request.getParameter("word");
word = java.net.URLDecoder.decode(word,"UTF-8");

例子：js:

/****
* 厂商自动完成功能
*/

$(function() {

$( "#mediaName_temp" ).autocomplete({
source: function( request, response ) {
if(trim(request.term)!=""){
//alert("111");
$.ajax({
url: "/json/selectMedia.json",
dataType: "json",
data: {
featureClass: "P",
style: "full",
maxRows: 12,
name_startsWith: encodeURI(request.term)
},
success: function( data ) {
response( $.map( data.mediaList, function( item ) {
return {
label:  item.mediaName,
value: item.mediaName,
id:	item.id
}
}));
}
});

}
},
minLength: 1,
select: function( event, ui ) {

document.getElementById("mediaId").value=ui.item.id ;
document.getElementById("mediaName").value=ui.item.value ;
document.getElementById("mediaName_temp").disabled="disabled";

},
open: function() {
$( this ).removeClass( "ui-corner-all" ).addClass( "ui-corner-top" );
},
close: function() {
$( this ).removeClass( "ui-corner-top" ).addClass( "ui-corner-all" );
}
});
});

servlet:

@RequestMapping("/json/selectMedia.json")
public ModelAndView selectMedia(HttpServletRequest req,
HttpServletResponse resp, ModelMap modelMap, Media media) {
String mediaName = req.getParameter("name_startsWith").trim();

try {
mediaName = java.net.URLDecoder.decode(mediaName,"UTF-8");
} catch (UnsupportedEncodingException e1) {

e1.printStackTrace();
}
media.setMediaName(mediaName);
List<Media> mediaList = mediaService.selectMediaList(media);
//List<MediaDictionary> adTypeList = mediaDictionaryService.queryMediaDictionaryList("adType");

modelMap.put("mediaList", mediaList);
//modelMap.put("adTypeList", adTypeList);

return new ModelAndView(jsonView);
}