如何通过过滤器技术防止中文乱码现象？_通过过滤器实现提交数据的编码为utf-8,防止乱码的发生javaweb-优快云博客

本文介绍了一个使用JSP获取HTTP请求参数的具体实例，包括用户信息与兴趣爱好等多值参数，并通过自定义过滤器实现了对请求数据的统一编码处理。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

MyJsp.jsp

<body>
  <%
  			String user=request.getParameter("user");
  			out.print("user"+user);
  			String password=request.getParameter("password");
  			out.print("password"+password);
  			String [] interest=request.getParameterValues("interest");
  			
  			%>
  			爱好：<%
  			for(String i: interest){
  				out.println(i);
  		    }%>
  		
  
   
    
  </body>

  SetCharFilter.java

package com.kgc.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;

public class SetCharFilter implements Filter {

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		//执行的过滤功能
		request.setCharacterEncoding("utf-8");
		response.setCharacterEncoding("utf-8");
		chain.doFilter(request, response);
	}

	@Override
	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		
	}

}

web.xml

 <filter>
  	<filter-name>SetCharFilter</filter-name>
  	<filter-class>com.kgc.filter.SetCharFilter</filter-class>
  </filter>
  
  <filter-mapping>
  	<filter-name>SetCharFilter</filter-name>
 <!--  	过滤拦截url -->
  	<url-pattern>/*</url-pattern>
  </filter-mapping>

DoMyJsp.jsp

 
  <body>
  <%
  			String user=request.getParameter("user");
  			out.print("user"+user);
  			String password=request.getParameter("password");
  			out.print("password"+password);
  			String [] interest=request.getParameterValues("interest");
  			
  			%>
  			爱好：<%
  			for(String i: interest){
  				out.println(i);
  		    }%>
  		
  
   
    
  </body>