J2EE中文乱码怎么解决

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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;
/**
* 过滤器
*
* @author Administrator
*
*/
public class EncodingFilter implements Filter {
private String targetEncoding = "ASCII"; // 初始值是ASCII编码
public void destroy() {
}
public void init(FilterConfig config) throws ServletException {
this.targetEncoding = config.getInitParameter("Encoding");
}
public void doFilter(ServletRequest srequest, ServletResponse sresponse,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) srequest;
request.setCharacterEncoding(targetEncoding);
chain.doFilter(srequest, sresponse);
}
}