我是这么做的，建立一个Servlet基类，覆盖service方法，在调用父类的service方
法前读取并解析form提交的内容，请看下面的源代码：
package com.hto.servlet;
import javax.servlet.http.HttpServletRequest;
import java.util.*;
/**
* Insert the type's description here.
* Creation date: (2001-2-4 15:43:46)
* @author: 钱卫春
*/
public class UTF8ParameterReader {
Hashtable pairs = new Hashtable();
/**
* UTF8ParameterReader constructor comment.
*/
public UTF8ParameterReader(HttpServletRequest request) throws java.io.IOExce
ption{
super();
parse(request.getQueryString());
parse(request.getReader().readLine());
}
/**
* UTF8ParameterReader constructor comment.
*/
public UTF8ParameterReader(HttpServletRequest request,String encoding) throw
s java.io.IOException{
super();
parse(request.getQueryString(),encoding);
parse(request.getReader().readLine(),encoding);
}
public static String decode(String s) throws Exception {
StringBuffer sb = new StringBuffer();
for(int i=0; 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 encoding String result = sb.toString(); byte[] inputBytes = result.getBytes("8859_1"); return new String(inputBytes,"UTF8"); } public static String decode(String s,String encoding) throws Exception { StringBuffer sb = new StringBuffer(); for(int i=0; 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 encoding String 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[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) 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)); value = decode(aPair.substring(pos+1)); }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()); } } /** * 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()); } } } 这个类的功能就是读取并保存form提交的信息，并实现常用的getParameter方法。 package com.hto.servlet; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; /** * Insert the type's description here. * Creation date: (2001-2-5 8:28:20) * @author: 钱卫春 */ public class UtfBaseServlet extends HttpServlet { public static final String PARAMS_ATTR_NAME = "PARAMS_ATTR_NAME"; /** * Process incoming HTTP GET requests * * @param request Object that encapsulates the request to the servlet * @param response Object that encapsulates the response from the servlet */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { performTask(request, response); } /** * Process incoming HTTP POST requests * * @param request Object that encapsulates the request to the servlet * @param response Object that encapsulates the response from the servlet */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { performTask(request, response); } /** * Insert the method's description here. * Creation date: (2001-2-5 8:52:43) * @return int * @param request javax.servlet.http.HttpServletRequest * @param name java.lang.String * @param required boolean * @param defValue int */ public static java.sql.Date getDateParameter(HttpServletRequest request, Str ing name, boolean required, java.sql.Date defValue) throws ServletException{ String value = getParameter(request,name,required,String.valueOf(defValue)); return java.sql.Date.valueOf(value); } /** * Insert the method's description here. * Creation date: (2001-2-5 8:52:43) * @return int * @param request javax.servlet.http.HttpServletRequest * @param name java.lang.String * @param required boolean * @param defValue int */ public static double getDoubleParameter(HttpServletRequest request, String n ame, boolean required, double defValue) throws ServletException{ String value = getParameter(request,name,required,String.valueOf(defValue)); return Double.parseDouble(value); } /** * Insert the method's description here. * Creation date: (2001-2-5 8:52:43) * @return int * @param request javax.servlet.http.HttpServletRequest * @param name java.lang.String * @param required boolean * @param defValue int */ public static float getFloatParameter(HttpServletRequest request, String nam e, boolean required, float defValue) throws ServletException{ String value = getParameter(request,name,required,String.valueOf(defValue)); return Float.parseFloat(value); } /** * Insert the method's description here. * Creation date: (2001-2-5 8:52:43) * @return int * @param request javax.servlet.http.HttpServletRequest * @param name java.lang.String * @param required boolean * @param defValue int */ public static int getIntParameter(HttpServletRequest request, String name, b oolean required, int defValue) throws ServletException{ String value = getParameter(request,name,required,String.valueOf(defValue)); return Integer.parseInt(value); } /** * Insert the method's description here. * Creation date: (2001-2-5 8:43:36) * @return java.lang.String * @param request javax.servlet.http.HttpServletRequest * @param name java.lang.String * @param required boolean * @param defValue java.lang.String */ public static String getParameter(HttpServletRequest request, String name, b oolean required, String defValue) throws ServletException{ if(request.getAttribute(UtfBaseServlet.PARAMS_ATTR_NAME) != null) { UTF8ParameterReader params = (UTF8ParameterReader)request.getAttribute(UtfBa seServlet.PARAMS_ATTR_NAME); if (params.getParameter(name) != null) return params.getParameter(name); if (required) throw new ServletException("The Parameter "+name+" Required bu t not provided!"); else return defValue; }else{ if (request.getParameter(name) != null) return request.getParameter(name); if (required) throw new ServletException("The Parameter "+name+" Required bu t not provided!"); else return defValue; } } /** * Returns the servlet info string. */ public String getServletInfo() { return super.getServletInfo(); } /** * Insert the method's description here. * Creation date: (2001-2-5 8:52:43) * @return int * @param request javax.servlet.http.HttpServletRequest * @param name java.lang.String * @param required boolean * @param defValue int */ public static java.sql.Timestamp getTimestampParameter(HttpServletRequest re quest, String name, boolean required, java.sql.Timestamp defValue) throws Se rvletException{ String value = getParameter(request,name,required,String.valueOf(defValue)); return java.sql.Timestamp.valueOf(value); } /** * Initializes the servlet. */ public void init() { // insert code to initialize the servlet here } /** * Process incoming requests for information * * @param request Object that encapsulates the request to the servlet * @param response Object that encapsulates the response from the servlet */ public void performTask(HttpServletRequest request, HttpServletResponse resp onse) { try { // Insert user code from here. } catch(Throwable theException) { // uncomment the following line when unexpected exceptions // are occuring to aid in debugging the problem. //theException.printStackTrace(); } } /** * Insert the method's description here. * Creation date: (2001-2-5 8:31:54) * @param request javax.servlet.ServletRequest * @param response javax.servlet.ServletResponse * @exception javax.servlet.ServletException The exception description. * @exception java.io.IOException The exception description. */ public void service(ServletRequest request, ServletResponse response) throws javax.servlet.ServletException, java.io.IOException { String content = request.getContentType(); if(content == null || content != null && content.toLowerCase().startsWith("a pplication/x-www-form-urlencoded")) request.setAttribute(PARAMS_ATTR_NAME,new UTF8ParameterReader((HttpServletRe quest)request)); super.service(request,response); } } 这个就是Servlet基类，它覆盖了父类的service方法，在调用父类service前，创建 了UTF8ParameterReader对象，其中保存了form中提交的信息。然后把这个对象作为一个 Attribute保存到Request对象中。然后照样调用父类的service方法。 对于继承这个类的Servlet，要注意的是，"标准"getParameter在也不能读到post的 数据，因为在这之前这个类中已经从ServletInputStream中读出了数据了。所以应该使 用该类中提供的getParameter方法。 剩下的就是输出问题了，我们要把输出的信息，转为UTF8的二进制流输出。只要我 们设置Content-Type时指定charset为UTF8，然后使用PrintWriter输出，那么这些转换 是自动进行的，Servlet中这样设置： response.setContentType("text/html;charset=UTF8"); Jsp中这样设置： <%@ page contentType="text/html;charset=UTF8"%> 这样就可以保证输出是UTF8流，客户端能否显示，就看客户端的了。 对于multipart/form-data的form提交的内容，我也提供一个类用来处理，在这个类 的构造子中可以指定页面使用的charset，默认还是UTF-8，限于篇幅不贴出源码，如果 感兴趣可以mail to：vividq@china.com和我探讨。