防止出现乱码，J2EE项目统一使用UTF-8编码设置方法
1.数据库建立为UTF-8格式
2.项目右键属性为UTF-8格式
3.所有页面申明为UTF-8
4.JDBC URL设为：UTF-8
jdbc:mysql://localhost:3306/company?useUnicode=true&characterEncoding=utf-8
5.数据库Driver选择UTF-8格式
6.Tomcat编码改成UTF-8
在server.xml里面增加URIEncoding="UTF-8"

<Connector port="8080" maxHttpHeaderSize="8192" maxThreads="150" minSpareThreads="25" maxSpareThreads="75" enableLookups="false" redirectPort="8443" acceptCount="100" connectionTimeout="20000" disableUploadTimeout="true" URIEncoding="UTF-8" />

7.加编码过滤器SetCharacterEncodingFilter.java 
注意：根据所在包名确定具体使用哪个包

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 SetCharacterEncodingFilter implements Filter {

	protected String encoding = null;

	protected FilterConfig filterConfig = null;

	protected boolean ignore = true;

	public void init(FilterConfig filterConfig) throws ServletException {

		this.filterConfig = filterConfig;

		this.encoding = filterConfig.getInitParameter("encoding");

		String value = filterConfig.getInitParameter("ignore");

		if (value == null)

			this.ignore = true;

		else if (value.equalsIgnoreCase("true"))

			this.ignore = true;

		else if (value.equalsIgnoreCase("yes"))

			this.ignore = true;

		else

			this.ignore = false;

	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {

		// TODO 自动生成方法存根

		if (ignore || (request.getCharacterEncoding() == null)) {

			String encoding = selectEncoding(request);

			if (encoding != null)

				request.setCharacterEncoding(encoding);

		}

		chain.doFilter(request, response);

	}

	public void destroy() {

		// TODO 自动生成方法存根

		this.encoding = null;

		this.filterConfig = null;

	}

	protected String selectEncoding(ServletRequest request) {

		return (this.encoding);

	}

}

在web.xml里面映射配置

  <filter>
    <filter-name>Set Character Encoding</filter-name>
    <filter-class>com.yourcompany.util.SetCharacterEncodingFilter</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>

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