防止sql注入

<filter>
      <filter-name>XssSqlFilter</filter-name>
    <filter-class>com.thundersoft.metadata.utils.filter.XssFilter</filter-class>
  </filter>
  <filter-mapping>
      <filter-name>XssSqlFilter</filter-name>
    <url-pattern>/*</url-pattern>
      <dispatcher>REQUEST</dispatcher>

  </filter-mapping>

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package com.thundersoft.metadata.utils.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;


public class XssFilter implements Filter {
    FilterConfig filterConfig = null;


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


    public void destroy() {
        this.filterConfig = null;
    }


    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        chain.doFilter(new XssHttpServletRequestWrapper(
                (HttpServletRequest) request), response);
    }
}

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package com.thundersoft.metadata.utils.filter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;


public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper {  
    public XssHttpServletRequestWrapper(HttpServletRequest servletRequest) {
        super(servletRequest);
    }
    public String[] getParameterValues(String parameter) {
      String[] values = super.getParameterValues(parameter);
      if (values==null)  {
                  return null;
          }
      int count = values.length;
      String[] encodedValues = new String[count];
      for (int i = 0; i < count; i++) {
                 encodedValues[i] = cleanXSS(values[i]);
       }
      return encodedValues;
    }
    public String getParameter(String parameter) {
          String value = super.getParameter(parameter);
          if (value == null) {
                 return null;
                  }
          return cleanXSS(value);
    }
    public String getHeader(String name) {
        String value = super.getHeader(name);
        if (value == null)
            return null;
        return cleanXSS(value);
    }
    private String cleanXSS(String value) {
                //You'll need to remove the spaces from the html entities below
        value = value.replaceAll("<", "& lt;").replaceAll(">", "& gt;");
        value = value.replaceAll("\\(", "& #40;").replaceAll("\\)", "& #41;");
        value = value.replaceAll("'", "& #39;");
        value = value.replaceAll("eval\\((.*)\\)", "");
        value = value.replaceAll("[\\\"\\\'][\\s]*javascript:(.*)[\\\"\\\']", "\"\"");
        value = value.replaceAll("script", "");
        return value;
    }


}