struts1.3设置编码三种方法

本文所写涉及的struts的版本是1.3x.
一、改写struts的ActionServlet. 重写process()方法：

package com.soft.struts.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionServlet;

public class MyActionServlet extends ActionServlet {
	protected void process(HttpServletRequest request,
			HttpServletResponse response) throws java.io.IOException,
			javax.servlet.ServletException {
		/** @todo Override this org.apache.struts.action.ActionServlet method */
		request.setCharacterEncoding("GB2312");
		super.process(request, response);
	}
}

配置相应的web.xml文件

<servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>com.soft.struts.action.MyActionServlet</servlet-class>
    ......
</servlet>

二、写一个过滤器类EncodingFilter.class，执行相关路径之前执行这个过滤器类。

package com.soft.struts.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;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * class EncodingFilter
 * 
 * @author xiaoqing.yu
 */
public class EncodingFilter implements Filter {

	/** encoding */
	protected String encoding = null;

	/** config */
	protected FilterConfig config;

	/** log */
	protected static final Log log = LogFactory.getLog(EncodingFilter.class);

	/**
	 * Mehtod destroy
	 */
	public void destroy() {
		this.config = null;
		this.encoding = null;
	}

	/**
	 * Method doFilter
	 * 
	 * @param request
	 *            ServletRequest
	 * @param response
	 *            ServletResponse
	 * @param filterChain
	 *            FilterChain
	 */
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain filterChain) throws IOException, ServletException {

		log.info("Before excuted the body of method EncodingFilter.doFilter(), Character Encoding is : "
						+ request.getCharacterEncoding());
		log.info("Excuting the body of method EncodingFilter.doFilter()...");
		if (request.getCharacterEncoding() == null) {
			if (this.getEncoding() != null) {
				request.setCharacterEncoding(this.getEncoding());
			}
		}
		log.info("After excuted the body of method EncodingFilter.doFilter(), Character Encoding is : "
						+ request.getCharacterEncoding());
		filterChain.doFilter(request, response);
	}

	/**
	 * Method init
	 * 
	 * @param filterConfig
	 *            FilterConfig
	 */
	public void init(FilterConfig filterConfig) throws ServletException {
		this.config = filterConfig;
		this.encoding = this.config.getInitParameter("Encoding");
		log.info("Init Parameter Encoding : " + this.encoding);
	}

	/**
	 * Method getEncoding
	 * 
	 * @return String
	 */
	public String getEncoding() {
		return encoding;
	}
}

配置相应web.xml文件：

<filter>
<filter>
	<filter-name>encodingFilter</filter-name>
	<filter-class>com.soft.struts.filter.EncodingFilter</filter-class>
	<init-param>
		<param-name>Encoding</param-name>
		<param-value>GB2312</param-value>
	</init-param>
</filter>
<filter-mapping>
	<filter-name>encodingFilter</filter-name>
	<url-pattern>/*</url-pattern>
</filter-mapping>

三、通过Chain来处理：
使用chain的方法来处理的前提是，struts用org.apache.struts.chain.ComposableRequestProcessor类来处理用户提交的请求。不是RequestProcessor类。
写一个custom-chain-config.xml：

<?xml version="1.0" ?>
<catalog name="struts">
    <chain name="servlet-standard-preprocess">
        <command className="com.soft.struts.action.chain.EncodingChain"/>
    </chain>
</catalog>

EncodingChain.java实现org.apache.commons.chain.Command：

package com.soft.struts.action.chain;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.chain.Command;
import org.apache.commons.chain.Context;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.chain.contexts.ServletActionContext;

/**
 * class EncodingChain
 * @author xiaoqing.yu
 */
public class EncodingChain implements Command {

	/** log */
	protected static final Log log = LogFactory.getLog(TestChain.class);
	
	public boolean execute(Context context) throws Exception {
		ServletActionContext sacontext = (ServletActionContext) context;
		
		HttpServletRequest request = sacontext.getRequest();
		request.setCharacterEncoding("GB2312");
		log.info("Character Encoding : " + request.getCharacterEncoding());
		log.info("Chain test successfully...");
		return false;
	}
}

配置相应web.xml文件：

<servlet>
	......
	<init-param>
		<param-name>chainConfig</param-name>
		<param-value>
			org/apache/struts/chain/chain-config.xml,
			/WEB-INF/custom-chain-config.xml
		</param-value>
	</init-param>
	......
</servlet>