Tomcat 5/6 GBK 编码下完美解决中文表单问题的过滤器

最新推荐文章于 2020-12-19 05:07:30 发布

最新推荐文章于 2020-12-19 05:07:30 发布 · 117 阅读

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#Tomcat #Servlet #Java #JSP #Web

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常见的 Tomcat 5 表单编码提交后乱码的解决方案有很多, 有改 Tomcat Connector 属性的, 有加过滤器的. 但是 Tomcat 自带的那个过滤器只解决了 POST 方式的乱码却不能处理 GET 方式的乱码. 在这里那我就给出一个不需要修改任何 Tomcat 配置文件的完美解决中文问题的过滤器的代码:

index.jsp

<%@ page language="java"
 import="java.util.*"
 pageEncoding="GBK"
%>


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
>
<html>
  <head>
   
    <title>表单测试页面</title>

  </head>
  
  <body>
   <form action="action.jsp"
>
   GET 方式: <input type=text name="name"
 value
="GET 中文"
>
   <input type=submit>
   </form>
   
      <form action="action.jsp"
 method="POST"
>
   POST 方式: <input type=text name="name"
 value
="POST 中文"
>
   <input type=submit>
   </form>
  </body>
</html>

和普通的表单没有任何区别.

然后就是表单提交页面 action.jsp:

<%@ page language="java"
 pageEncoding="GBK"
%>
<html>
  <body>
   参数: <%=request.getParameter("name"
) %> <br>
  </body>
</html>

接着是过滤器的配置文件 web.xml (用 2.5 版本也可以):

<?
xml
 version
="1.0"
 encoding
="UTF-8"
?>

<
web-app
 version
="2.4"
 
    xmlns
="http://java.sun.com/xml/ns/j2ee"
 
    xmlns:xsi
="http://www.w3.org/2001/XMLSchema-instance"
 
    xsi:schemaLocation
="http://java.sun.com/xml/ns/j2ee 
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
>

    <
filter
>

    <
filter-name
>
TomcatFormFilter</
filter-name
>

    <
filter-class
>
filters.TomcatFormFilter</
filter-class
>

    </
filter
>

    
    <
filter-mapping
>

    <
filter-name
>
TomcatFormFilter</
filter-name
>

    <
url-pattern
>
*.jsp</
url-pattern
>

    </
filter-mapping
>

    
  <
welcome-file-list
>

    <
welcome-file
>
index.jsp</
welcome-file
>

  </
welcome-file-list
>

</
web-app
>

最后最关键的就是我们的过滤器代码了, 对 GET 方式使用请求包装器, 而 POST 方式则用 setCharacterEncoding():

package filters;

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.ServletException;
import  javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;

public
 class
 TomcatFormFilter implements Filter {
    /**

      * Request.java

      * 对 HttpServletRequestWrapper 进行扩充, 不影响原来的功能并能提供所有的 HttpServletRequest

      * 接口中的功能. 它可以统一的对 Tomcat 默认设置下的中文问题进行解决而只需要用新的 Request 对象替换页面中的

      * request 对象即可.

      */


    class
 Request extends HttpServletRequestWrapper
    {

        public
 Request(HttpServletRequest request) {
            super(request);
        }

        /**

         * 转换由表单读取的数据的内码.

         * 从 ISO 字符转到 GBK.

         */

        public
 String toChi(String input) {
            try
 {
              byte
[] bytes = input.getBytes("ISO8859-1"
);
              return
 new
 String(bytes, "GBK"
);
            }
            catch
 (Exception ex) {
            }
            return
 null
;
        }

        /**

         * Return the HttpServletRequest holded by this object.

         */

        private
 HttpServletRequest getHttpServletRequest()
        {
            return
 (HttpServletRequest)super.getRequest();
        }

        /**

         * 读取参数 -- 修正了中文问题.

         */

        public
 String getParameter(String name)
        {
            return
 toChi(getHttpServletRequest().getParameter(name));
        }

        /**

         * 读取参数列表 - 修正了中文问题.

         */

        public
 String[] getParameterValues(String name)
        {
              String values[] = getHttpServletRequest().getParameterValues(name);
              if
 (values != null
) {
                for
 (int
 i = 0; i < values.length; i++) {
                  values[i] = toChi(values[i]);
                }
              }
              return
 values;
        }
    }
    public
 void
 destroy() {
        
    }

    public
 void
 doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpreq = (HttpServletRequest)request;
        if
(httpreq.getMethod().equals("POST"
)) {
            request.setCharacterEncoding("GBK"
);
        } else
 {
            request = new
 Request(httpreq);
        }

        chain.doFilter(request, response);
    }

    public
 void
 init(FilterConfig filterConfig) throws ServletException {
    }

}

怎么样, 是不是很简单也很方便呢?