struts中配置过滤文件！

最新推荐文章于 2020-03-21 23:43:32 发布

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最新推荐文章于 2020-03-21 23:43:32 发布

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分类专栏： Java2收藏文章标签： struts encoding character filter initialization servlet

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博客介绍了在web.xml中配置字符编码过滤器的方法，添加了相关的filter和filter-mapping标签。同时给出了过滤文件的代码，包含过滤器的初始化、销毁、过滤等方法，用于设置请求的字符编码，确保请求参数能正确解析。

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在web.xml中加上
<filter>
    <filter-name>Set Character Encoding</filter-name>
    <filter-class>com.ytoa.util.SetCharacterEncodingFilter</filter-class>

<init-param>
      <param-name>encoding</param-name>
      <param-value>GB2312</param-value>
    </init-param>
    <init-param>
      <param-name>ignore</param-name>
      <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>Set Character Encoding</filter-name>
    <servlet-name>action</servlet-name>
</filter-mapping>

过滤文件为：
package com.ytoa.util;

import javax.servlet.*;
import java.io.IOException;

public class SetCharacterEncodingFilter implements Filter {

// ----------------------------------------------------- Instance Variables

    /**
     * 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;

// --------------------------------------------------------- Public Methods

    /**
     * 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
     */
    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;

}

// ------------------------------------------------------ Protected Methods

    /**
     * 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
     * <code>null</code>.
     * <p>
     * The default implementation unconditionally returns the value configured
     * by the <strong>encoding</strong> initialization parameter for this
     * filter.
     *
     * @param request The servlet request we are processing
     */
    protected String selectEncoding(ServletRequest request) {

return (this.encoding);

}