tomcat为utf8编码，解析gbk编码的URL请求，中文乱码处理
项目中tomcat设置为utf8解码，当对外的url接口（如ReceiveAction）接收到gbk编码请求时候会自动被tomcat解码为utf8，
此时中文直接request.getParameter("content")出来就是乱码，无法直接转换回gbk，怎么转换都是乱码。

解决方法:通过requset.getQueryString() 来获取到 %D6%D0%B9%FA 再urldecode 下就得到了 正确的中文了
此类，就是基于通过自己解析http的queryString和postdata来处理乱码问题的

import java.io.IOException;import java.util.ArrayList;import java.util.Enumeration;import java.util.Hashtable;import java.util.StringTokenizer;import javax.servlet.http.HttpServletRequest;/** * 项目中tomcat设置为utf8解码，当对外的url接口（如ReceiveAction）接收到gbk编码请求时候会自动被tomcat解码为utf8， * 此时中文直接request.getParameter("content")出来就是乱码，无法直接转换回gbk，怎么转换都是乱码。 *  * 解决方法:通过requset.getQueryString() 来获取到 %D6%D0%B9%FA 再urldecode 下就得到了 正确的中文了 * 此类，就是基于通过自己解析http的queryString和postdata来处理乱码问题的 *  */public class HttpRequestReader {Hashtable pairs = new Hashtable();/** * RawParameterReader constructor comment. */public HttpRequestReader(HttpServletRequest request, String encoding)throws IOException {super();parse(request.getQueryString(), encoding);parse(request.getReader().readLine(), encoding);}public static String decode(String s, String encoding) throws Exception {StringBuffer sb = new StringBuffer();for (int i = 0; i < s.length(); i++) {char c = s.charAt(i);switch (c) {case '+':sb.append(' ');break;case '%':try {sb.append((char) Integer.parseInt(s.substring(i + 1, i + 3), 16));} catch (NumberFormatException e) {throw new IllegalArgumentException();}i += 2;break;default:sb.append(c);break;}}// Undo conversion to external encodingString result = sb.toString();byte[] inputBytes = result.getBytes("8859_1");return new String(inputBytes, encoding);}/** * Insert the method's description here. Creation date: (2001-2-4 17:30:59) *  * @return java.lang.String * @param name *            java.lang.String */public String getParameter(String name) {if (pairs == null || !pairs.containsKey(name))return null;return (String) (((ArrayList) pairs.get(name)).get(0));}/** * Insert the method's description here. Creation date: (2001-2-4 17:28:17) *  * @return java.util.Enumeration */public Enumeration getParameterNames() {if (pairs == null)return null;return pairs.keys();}/** * Insert the method's description here. Creation date: (2001-2-4 17:33:40) *  * @return java.lang.String[] * @param name *            java.lang.String */public String[] getParameterValues(String name) {if (pairs == null || !pairs.containsKey(name))return null;ArrayList al = (ArrayList) pairs.get(name);String[] values = new String[al.size()];for (int i = 0; i < values.length; i++)values[i] = (String) al.get(i);return values;}/** * Insert the method's description here. Creation date: (2001-2-4 20:34:37) *  * @param urlenc *            java.lang.String */private void parse(String urlenc, String encoding)throws java.io.IOException {if (urlenc == null)return;StringTokenizer tok = new StringTokenizer(urlenc, "&");try {while (tok.hasMoreTokens()) {String aPair = tok.nextToken();int pos = aPair.indexOf("=");String name = null;String value = null;if (pos != -1) {name = decode(aPair.substring(0, pos), encoding);value = decode(aPair.substring(pos + 1), encoding);} else {name = aPair;value = "";}if (pairs.containsKey(name)) {ArrayList values = (ArrayList) pairs.get(name);values.add(value);} else {ArrayList values = new ArrayList();values.add(value);pairs.put(name, values);}}} catch (Exception e) {throw new java.io.IOException(e.getMessage());}}}

然后action或jsp中使用如下代码获取到的就是正常的中文了

HttpRequestReader paramReader = new HttpRequestReader(request, "gbk");String name = paramReader.getParameter("name");System.out.println(name);

参见：http://bbs.csdn.net/topics/390360298?page=1#post-393608658