Filter设置统一字符集

1.Filter设置统一字符集类：CharsetEncodingFilter.java

 

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;

/**
 * 统一设置字符集
 *
 */
public class CharsetEncodingFilter implements Filter {
 
 private String encoding;
 
 public void destroy() {
 }

 public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
   FilterChain filterChain) throws IOException, ServletException {
  
  //设置字符集
  servletRequest.setCharacterEncoding(encoding);
    filterChain.doFilter(servletRequest, servletResponse);
 }

 public void init(FilterConfig filterConfig) throws ServletException {
  //取得初始化参数
  this.encoding = filterConfig.getInitParameter("encoding");
  }
}

2.在web.xml增加以下内容

<filter>
  <filter-name>CharsetEncodingFilter</filter-name>
  <filter-class>com.lx.filter.CharsetEncodingFilter</filter-class>
  <init-param>
   <param-name>encoding</param-name>
   <param-value>GB18030</param-value>
  </init-param>
 </filter>
 
 <filter-mapping>
  <filter-name>CharsetEncodingFilter</filter-name>
  <url-pattern>*.jsp</url-pattern>
 </filter-mapping>