pager-taglib分页控件查询参数乱码解决方法

[size=large][size=x-large][b]以前搞了很长时间一直没解决jsp pager-tablib查询带中文参数出现乱码的错误。今天花了相对较少的时间解决了很开心，原因和解决方法如下：

问题：[size=large]

使用<pg:param name="key" />标签传递中文参数时，会有乱码。

原因：

因为它默认是用gb2312来对添加的参数进行编码，如果你的过滤器、jsp页面都是采用的gb2312就没有什么问题，如果你采用的是utf-8来编码，那么中文参数传递过程中就会出现乱码导致无法解析。

网上有很多解决办法，重新修改编译源代码是一种方法；

在com\jsptags\navigation\pager下面的PagerTag的addParam(String name, String value)中，它原本是采用的URLEncoding.encode(value)方式来对传递的参数进行编码的，修改成为 URLEncoding.encode(value, "UTF-8")后，替换掉原来jar包的这个class文件再重新打包并引入到项目中就可以了。

也以前也有人建议，加过滤器，修改服务器编码/jsp编码为一致，加URLEncoding都未解决，当时页面都是设置为utf-8 的，一直没搞定。

解决办法：

将JSP页面编码pageEncoding设置为GB2312，在web.xml中加中文过滤器，即可解决！

<!-- 解决中文问题 -->
    <filter>
        <filter-name>SetCharacterEncodingFilter</filter-name>
        <filter-class>
            com.jxtit.util.SetCharacterEncodingFilter
          </filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>GB2312</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>SetCharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

<!-- 解决中文问题 -->

过滤器：

SetCharacterEncodingFilter：

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);
        //BufferedWriter bw = new BufferedWriter(new FileWriter("/temp/insertlog.log"));
    }

    /**
     * Place this filter into service.将这个filter放在服务器中
     *
     * @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);
    }

}
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