Java Servlet/Jsp多语言解决方案(二)

答案：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<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 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<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 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.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) 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(HttpSe

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