setencodefilter.java

自己编写的一个JSP+SERVER的框架, 实际项目已经运用多次,效率很好.

package com.aptech.util.filter;

import javax.servlet.Filter;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.FilterChain;
import java.io.IOException;

/**
 * 作用：过滤编码，即重新编码
 * 
 * @author 缪伟其
 * @since 2006-11-13
 */
public class SetEncodeFilter 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)) {

			// 取得编码
			encoding = selectEncoding(request);

			if (encoding != null)
				// 设定编码
				request.setCharacterEncoding(encoding);
		}

		chain.doFilter(request, response);

	}

	public void init(FilterConfig filterConfig) throws ServletException {

		this.filterConfig = filterConfig;
		this.encoding = filterConfig.getInitParameter("encoding");// 取得初始化参数值
		String value = filterConfig.getInitParameter("ignore"); // 取得初始化参数值

		if (value == null)
			this.ignore = true;
		else if (value.equalsIgnoreCase("true"))// 执行忽略大小写的比较
			this.ignore = true;
		else if (value.equalsIgnoreCase("yes"))// 执行忽略大小写的比较
			this.ignore = true;
		else
			this.ignore = false;

	}

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

}