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 >
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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 >
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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