利用过滤器实现不雅字符的过滤_JAVA_编程开发_程序员俱乐部

1.在项目中的WEB-INF目录下建立一个properties文件,文件名随意，我的是str.properties如图

2.str.properties里面添加name是要被和谐的字符,value是和谐后应该显示的字符如：

?3.贴上过滤器代码：

class="java" name="code">package com.filter;

import java.io.IOException;
import java.io.InputStream;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import java.util.Properties;
// java中用于读写 properties 文件的工具类


public class StrFilter  implements Filter{
	private Properties pro =null;
	
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		HttpServletRequest hrequest = (HttpServletRequest)request;
		HttpServletResponse hresponse = (HttpServletResponse)response;
		
		java.util.Enumeration names= hrequest.getParameterNames();
		while(names.hasMoreElements()){
			String name = names.nextElement().toString();
			String values[] = request.getParameterValues(name);
			for(int i = 0;i<values.length;i++){
				if(pro.getProperty(values[i])!=null){
					values[i]=pro.getProperty(values[i]);
					//将不雅字符替换为配置文件中对应的值
				}
			}
		}
		
		//实现模糊匹配？
		
		chain.doFilter(request, response);
	}

	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub
		//加载Properties文件
		 pro = new Properties();
		//1.获得ServletContext
		ServletContext context = filterConfig.getServletContext();
		//2.获得WEB-inf下配置文件的内容 IO 流
		InputStream is= context.getResourceAsStream("/WEB-INF/str.properties");
		//3.加载配置文件
		try {
			pro.load(is);
			//循环获取配置文件里所有的内容
			java.util.Enumeration names= pro.propertyNames();
			while(names.hasMoreElements()){
				String name = names.nextElement().toString();
				String value= pro.getProperty(name);
				System.out.println(name+" "+value);
			}

			
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

}

?

4.web.xml中配置

  <filter>
  	<filter-name>StrFilter</filter-name>
  	<filter-class>com.filter.StrFilter</filter-class>
  </filter>
   <filter-mapping>
  	<filter-name>StrFilter</filter-name>
  	<url-pattern>*</url-pattern>
   </filter-mapping>

?

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