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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