Filter拦截器解决中文乱码问题

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创建拦截器类,需要实现javax.servlet.Filter接口

public class FilterDemo1 implements Filter {    @Override    public void init(FilterConfig arg0) throws ServletException {        System.err.println("服务器启动时调用此方法,只调用一次,用来初始化");    }    @Override    public void destroy() {        System.err.println("服务器退出时调用此方法,只调用一次");    }    @Override    public void doFilter(ServletRequest arg0, ServletResponse arg1,        HttpServletRequest request = (HttpServletRequest) arg0;        HttpServletResponse response = (HttpServletResponse) arg1;        MyRequest request1 = new MyRequest(request);        //设置request的编码方式        request1.setCharacterEncoding("utf-8");        //解除拦截        chain.doFilter(request1, response);    }

自定义内部类,继承HttpServletRequestWrapper类
注:HttpServletRequestWrapper类实现了HttpServletRequest接口,重写了接口方法

class MyRequest extends HttpServletRequestWrapper{        private HttpServletRequest request ;        public MyRequest(HttpServletRequest request) {            super(request);            this.request = request;        }        @Override        public String getParameter(String name) {            String value = request.getParameter(name);            //判Null空            if(value==null){                return null;            }            //判请求方式            if(request.getMethod().equalsIgnoreCase("POST")){                return value;            }            try {                //转换编码方式                value = new String(value.getBytes("ISO-8859-1"),"utf-8");            } catch (UnsupportedEncodingException e) {                throw new RuntimeException(e);            }            return value;        }    }

在web.xml配置文件中加载Filter拦截器

    <filter>        <filter-name>FilterDemo1</filter-name>        <filter-class>filter.demo.FilterDemo1</filter-class>    </filter>    <filter-mapping>        <filter-name>FilterDemo1</filter-name>        <!-- /*为拦截所有请求 -->        <url-pattern>/*</url-pattern>    </filter-mapping>

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