Struts中解决汉字编码问题

1.修改web.xml文件,在＜web-app＞标签后增加如下内容. 

<filter>
  <filter-name>Set Character Encoding</filter-name>
  <filter-class>xx.xx.SetEncodingFilter</filter-class>
  <init-param>
   <param-name>encoding</param-name>
   <param-value>gb2312</param-value>
  </init-param>
 </filter>
 <filter-mapping>
  <filter-name>Set Character Encoding</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>

 2.创建类文件(SetEncodingFilter.java)

package xx.xx;

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;

/**
 * Set All HttpRequest Encoding
 *
 */
public class SetEncodingFilter 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 {
  if (ignore || (request.getCharacterEncoding() == null)) {
   request.setCharacterEncoding(selectEncoding(request));
  }
  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")
    || 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
  * ＜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);
 }

 /**
  * Returns the filterConfig.
  *
  * @return FilterConfig
  */
 public FilterConfig getFilterConfig() {
  return filterConfig;
 }

 /**
  * Sets the filterConfig.
  *
  * @param filterConfig
  *            The filterConfig to set
  */
 public void setFilterConfig(FilterConfig filterConfig) {
  this.filterConfig = filterConfig;
 }