changecharsetfilter.java

来自「Struts入门的一个好例子 Struts入门的一个好例子」· Java 代码 · 共 42 行

package bily.notebook.util;

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 ChangeCharsetFilter implements Filter {
	protected String encoding = null;//要制定的编码，在web.xml中配
	protected FilterConfig filterConfig = null;
	
	public void destroy() {
		this.encoding = null;
		this.filterConfig = null;
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		if (request.getCharacterEncoding() == null) {
			String encoding = getEncoding();//得到指定的编码名
			if (encoding != null)
				request.setCharacterEncoding(encoding);//设置request的编码
		}
		chain.doFilter(request, response);//有机会执行下一个filter
	}

	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;
		this.encoding = filterConfig.getInitParameter("encoding");
		//得到在web.xml中配置的编码
	}

	protected String getEncoding() {
		return (this.encoding);//得到指定的编码
	}

}