同事遇到编码问题时想做一个解决全站的字符编码过滤器,过滤器类和配置如下:
过滤器类:
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< span style = "font-size:12px;" >package com.chaoxing.newspaper.web.filter; import java.io.IOException; import java.lang.reflect.InvocationHandler; import java.lang.reflect.Method; import java.lang.reflect.Proxy; 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; import javax.servlet.http.HttpServletResponse; public class CharacterEncodingFilter implements Filter { public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException { System.out.println("过滤器执行"); final HttpServletRequest request = (HttpServletRequest) req; HttpServletResponse response = (HttpServletResponse) res; //解决post请求的中文乱码 request.setCharacterEncoding("UTF-8"); response.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=UTF-8"); chain.doFilter((ServletRequest) Proxy.newProxyInstance(this.getClass().getClassLoader(), request.getClass().getInterfaces(), new InvocationHandler(){ @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { String methodname = method.getName(); //拿到当前的方法 if(methodname.equals("getParameter")){ //执行request.getparameter获取结果 String value = (String) method.invoke(request, args); if(value==null){ return null; } if(!request.getMethod().equalsIgnoreCase("get")){ //判断是为get请求 return value; } System.out.println(value+"|||||"); //转换编码返回 value = new String(value.getBytes("UTF-8"),"UTF-8"); System.out.println(value+"======="); return value; } //交给request执行请求 return method.invoke(request, args); } } ), res); } public void init(FilterConfig fConfig) throws ServletException { System.out.println("过滤器初始化"); } @Override public void destroy() { System.out.println("过滤器完成"); } }</ span > |
过滤器配置:
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< span style = "font-size:12px;" > <!--解决全站乱码的filter --> < filter > < filter-name >CharacterEncoding</ filter-name > < filter-class >com.XXX.web.filter.CharacterEncodingFilter</ filter-class > </ filter > < filter-mapping > < filter-name >CharacterEncoding</ filter-name > < url-pattern >/*</ url-pattern > </ filter-mapping ></ span > |
但是在前端form的提交方式是get的情况下,得到的仍然是乱码。
刚开始一直纠结于过滤器是不是写错了,编码集是不是写错了,但是经过测试,并没有错,过滤器正常运行,
最后把value.getByte("iso-8859-1","utf-8") 改为 value.getByte("utf-8","utf-8")后台就能得到值,不再是乱码了。最后百度了下,
说tomcat8默认的编码集是utf-8,tomcat8之前默认的编码集是iso-8859-1,恍然大悟......
总结:tomcat7及其版本之前默认的编码集是iso-8859-1,tomcat8默认的字符集已经是UTF-8,所以不再需要为request.getParameter()的结果进行转码,不需要编码编码过滤器类了
以上这篇基于tomcat8 编写字符编码Filter过滤器无效问题的解决方法就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:http://blog.csdn.net/fachunfc/article/details/72846439