这里是一个具体的例子
现在因为浏览器对UTF的支持我们可以通过在源文件请求响应中都使用unicode编码方式来轻松达到处理国际化和字符编码问题的目标
以我们使用的tomcat为例过程如下
编写JSP页面时在每个JSP页面在页首都要增加一行
在编辑JSP页面时一定要确保JSP文件以unicode的方式保存目前几乎所有的编辑器都有以unicode编码保存或将文件内容转换成unicode的功能
增加一个用来声明request的CharacterEncoding的类SetCharacterEncodingFilterjava
SetCharacterEncodingFilter的这个类主要的作用就是把request在从页面刚提交到server端的时候的encoding声明为我们想要的encoding通过调用request的方法setCharacterEncoding (String encoding) 来改变这样可以使request的从客户端传过来的时候按我们在webxml (在第二点可以讲到) 中配置的encoding来对提交的数据编码
修改webxml文件配置一个filter来过滤全部url请求通过第二步中的类声明所有url请求的编码类型未UTF
在webxml文件中加上以下这段
Set Character Encoding
orgkylewebsampleSetCharacterEncodingFilter
encoding
UTF
Set Character Encoding
/*
在上面这段文字中orgkylewebsampleSetCharacterEncodingFilter指定步骤中的类的位置 UTF指定我们希望声明的request的编码类型/*指定这个filter的适用范围(这里指的是全部url请求)
同时注意二个问题
servlet的版本必需是支持requestsetCharacterEncoding(String encoding)这个方法才行也就是在serlvert以上
控制面板区域设置的当前代码页属性必需设定为 (GBK)如果是（OEMUnited States）它处理文字的时候是－bit而中文和日文等是－bit所以在显示和处理时它把中文的前位给截掉这样就会出现乱码问题
附SetCharacterEncodingFilter源文件
package orgkylewebsample;
import javaioIOException;
import javaxservletFilter;
import javaxservletFilterChain;
import javaxservletFilterConfig;
import javaxservletServletException;
import javaxservletServletRequest;
import javaxservletServletResponse;
import javaxservletUnavailableException;
public class SetCharacterEncodingFilter implements Filter
{
/**
* The default character encoding to set for requests that pass through
* this filter
*/
protected String encoding = null;
/**
* The filter configuration object we are associated withIf this value
* is null this filter instance is not currently configured
*/
protected FilterConfig filterConfig = null;
/**
* Should a character encoding specified by the client be ignored?
*/
protected boolean ignore = true;
/**
* Take this filter out of service
*/
public void destroy()
{
thisencoding = null;
thisfilterConfig = null;
}
/**
* Select and set (if specified) the character encoding to be used to
* interpret request parameters for this request
*
* @param request The servlet request we are processing
* @param result The servlet response we are creating
* @param chain The filter chain we are processing
*
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet error occurs
*/
public void doFilter(ServletRequest request ServletResponse response
FilterChain chain)
throws IOException ServletException
{
// Conditionally select and set the character encoding to be used
if (ignore || (requestgetCharacterEncoding() == null))
{
String encoding = selectEncoding(request);
if (encoding != null)
requestsetCharacterEncoding(encoding);
}
// Pass control on to the next filter
chaindoFilter(request response);
}
/**
* Place this filter into service
*
* @param filterConfig The filter configuration object
*
*encoding
* UTF
*
*/
public void init(FilterConfig filterConfig) throws ServletException
{
thisfilterConfig = filterConfig;
thisencoding = filterConfiggetInitParameter(encoding);
String value = filterConfiggetInitParameter(ignore);
if (value == null)
thisignore = true;
else if (valueequalsIgnoreCase(true))
thisignore = true;
else if (valueequalsIgnoreCase(yes))
thisignore = true;
else
thisignore = false;
}
/**
* Select an appropriate character encoding to be used based on the
* characteristics of the current request and/or filter initialization
* parametersIf no character encoding should be set return
* null
*
* The default implementation unconditionally returns the value configured
* by the encoding initialization parameter for this
* filter
*
* @param request The servlet request we are processing
*/
protected String selectEncoding(ServletRequest request)
{
return (thisencoding);
}
}
