过滤器解决struts乱码问题

1. 编写过滤器：SetCharacterEncodingFilter.java

 

package com.yang.shop.filter;

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;

public class SetCharacterEncodingFilter implements Filter {
	protected String encoding = null;
	protected FilterConfig filterConfig = null;
	protected boolean ignore = true;

	public void destroy() {
		this.encoding = null;
		this.filterConfig = null;
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		if (ignore || (request.getCharacterEncoding() == null)) {
			String encoding = selectEncoding(request);

			if (encoding != null)
				request.setCharacterEncoding(encoding);
		}
		chain.doFilter(request, response);

	}

	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 String selectEncoding(ServletRequest request) {
		return (this.encoding);
	}

}

 

 2. 在web.xml中添加如下配置：

 

 

<filter>
	<filter-name>SetCharacterEncoding</filter-name>
	<filter-class>
		com.yang.shop.filter.SetCharacterEncodingFilter
	</filter-class>
	<init-param>
		<param-name>encoding</param-name>
		<param-value>utf-8</param-value>
	</init-param>
	<init-param>
		<param-name>ignore</param-name>
		<param-value>true</param-value>
	</init-param>
</filter>
<filter-mapping>
	<filter-name>SetCharacterEncoding</filter-name>
	<servlet-name>action</servlet-name>
</filter-mapping>
<filter-mapping>
	<filter-name>SetCharacterEncoding</filter-name>
	<servlet-name>*.jsp</servlet-name>
</filter-mapping>