Servlet 中文乱码解决

Filter类：

package com.agr.common.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;
import javax.servlet.UnavailableException;

public class EncodingFilter implements Filter {
	protected String encoding = null;
	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 {
		// Select and set (if needed) the character encoding to be used
		String encoding = selectEncoding(request);
		if (encoding != null) {
			request.setCharacterEncoding(encoding);
		}
		// Pass control on to the next filter
		chain.doFilter(request, response);
	}

	public void init(FilterConfig filterConfig) throws ServletException {
		this.filterConfig = filterConfig;
		this.encoding = filterConfig.getInitParameter("encoding");
	}

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

在网站webapp/WEB-INF/web.xml中添加:

<filter>
		<filter-name>Set Character Encoding</filter-name>
		<filter-class>com.agr.common.util.EncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>UTF-8</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>Set Character Encoding</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

链接数据库时编码设置：

Connection conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/agriculture?characterEncoding=utf-8", "root", "");