java解决post和get的乱码问题---配置全局的过滤器

最新推荐文章于 2020-05-23 16:53:34 发布

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博客介绍了Java过滤器的实现与配置。首先建立一个类并实现Filter接口，需将ServletRequest和ServletResponse转为HttpServletRequest和HttpServletResponse；接着配置web.xml，过滤器要写在拦截器之后、servlet之前，完成配置后可正常使用中文。

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1.建立一个类，然后实现Filter接口

重点在于：将ServletRequest和ServletResponse转为HttpServletRequest和HttpServletResponse

package com.lxb.view.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 javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CharSetFilter implements Filter{
	
	private String charset;
	
	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		HttpServletResponse res = (HttpServletResponse) response;
		HttpServletRequest req = (HttpServletRequest) request;
		res.setCharacterEncoding(charset);
		req.setCharacterEncoding(charset);
		
		chain.doFilter(request, response);
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		
		charset = arg0.getInitParameter("charset");
		
	}

}

2.配置web.xml

过滤器要写在拦截器之后，servlet之前

<filter>
		<filter-name>charsetFilter</filter-name>
		<filter-class>com.lxb.view.filter.CharSetFilter</filter-class>
		<init-param>
			<param-name>charset</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>charsetFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

然后就可以放心的使用中文啦！