H5W3
当前位置:H5W3 > 其他技术问题 > 正文

Java多语言编码问题解析(2)

  这里是一个具体的例子:    现在因为浏览器对UTF-8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tomcat4.1.2为例,过程如下:    1、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。    2、增加一个用来声明request的CharacterEncoding的类SetCharacterEncodingFilter.java;  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web.xml (在第二点可以讲到) 中配置的encoding来对提交的数据编码。    3、修改web.xml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-8。  在web.xml文件中加上以下这段:    Set Character Encoding  org.kyle.web.sample.SetCharacterEncodingFilter    encoding  UTF-8      Set Character Encoding  /*      在上面这段文字中“org.kyle.web.sample.SetCharacterEncodingFilter”指定步骤2中的类的位置,“ UTF-8”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:  1:servlet的版本必需是支持request.setCharacterEncoding(String encoding)这个方法才行,也就是在serlvert2.3以上。  2:控制面板区域设置的当前代码页属性必需设定为”936 (GBK)”,如果是”437(OEM-United States)”它处理文字的时候是8-bit,而中文和日文等是16-bit。所以在显示和处理时它把中文的前8位给截掉,这样就会出现乱码问题。    附:SetCharacterEncodingFilter源文件  package org.kyle.web.sample;  import java.io.IOException;  import javax.servlet.Filter;  import javax.servlet.FilterChain;  import javax.servlet.FilterConfig;  import javax.servlet.ServletException;  import javax.servlet.ServletRequest;  import javax.servlet.ServletResponse;  import javax.servlet.UnavailableException;  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 with. If 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()  {  this.encoding = null;  this.filterConfig = 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 || (request.getCharacterEncoding() == null))  {  String encoding = selectEncoding(request);  if (encoding != null)  request.setCharacterEncoding(encoding);  }    // Pass control on to the next filter  chain.doFilter(request, response);  }    /**  * Place this filter into service.  *  * @param filterConfig The filter configuration object  *  *encoding  * UTF-8  *  */  public void init(FilterConfig filterConfig) throws ServletException  {  this.filterConfig = filterConfig;  this.encoding = filterConfig.getInitParameter(“encoding”);  String value = filterConfig.getInitParameter(“ignore”);  if (value == null)  this.ignore = true;  else if (value.equalsIgnoreCase(“true”))  this.ignore = true;  else if (value.equalsIgnoreCase(“yes”))  this.ignore = true;  else  this.ignore = false;  }    /**  * Select an appropriate character encoding to be used, based on the  * characteristics of the current request and/or filter initialization  * parameters. If 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 (this.encoding);  }  }  

本文地址:H5W3 » Java多语言编码问题解析(2)

评论 0

  • 昵称 (必填)
  • 邮箱 (必填)
  • 网址