<span style="white-space:pre">  </span>public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("utf-8");response.setContentType("text/html;charset=utf-8");}

但是在这里就存在一个问题，每创建servlet都需要加上这样一段代码，还需要知道是POST提交还是GET提交，这样就显得很繁琐，需要解决这个问题就要用到web开发中另一个重要的知识点-过滤器。

<span style="white-space:pre">    </span><filter><description>全局编码过滤器</description><filter-name>EncodingFilter</filter-name><filter-class>com.ruijie.filter.EncodingFilter</filter-class><init-param><param-name>encode</param-name><param-value>utf-8</param-value></init-param></filter><filter-mapping><filter-name>EncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>

在实现的类中处理乱码，当所有的资源访问时都会通过这个过滤器过滤，从而达到解决乱码的目的。

<span style="white-space:pre">   </span>public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {response.setContentType("text/html;charset="+encode); //解决响应乱码chain.doFilter(new MyHttpServletRequest((HttpServletRequest) request), response);}

上文也说了在解决乱码过程中get方式提交的方式是需要主要解决的，在获取参数过程中通常是通过以下三个方法获取：

<span style="white-space:pre">  </span>getParameterMap()getParameterValues(String name)getParameter(String name)

<span style="white-space:pre">  </span>class MyHttpServletRequest extends HttpServletRequestWrapper{private HttpServletRequest request = null;private boolean isNotEncode = true;public MyHttpServletRequest(HttpServletRequest request) {super(request);this.request = request;}@Overridepublic Map getParameterMap() {try{if(request.getMethod().equalsIgnoreCase("POST")){//--如果是post提交request.setCharacterEncoding(encode);return request.getParameterMap();}else if(request.getMethod().equalsIgnoreCase("GET")){//--如果是get提交Map<String,String[]> map = request.getParameterMap();if(isNotEncode){//只能在第一次解决乱码for(Map.Entry<String, String[]> entry : map.entrySet()){String [] vs = entry.getValue();for(int i=0;i<vs.length;i++){vs[i] = new String(vs[i].getBytes("iso8859-1"),encode);}}isNotEncode = false;//设置为false,第二次就不会再进这个代码块了}return map;}else{return request.getParameterMap();}}catch (Exception e) {e.printStackTrace();throw new RuntimeException(e);}}@Overridepublic String[] getParameterValues(String name) {return (String[]) getParameterMap().get(name);}@Overridepublic String getParameter(String name) {return getParameterValues(name) == null ? null : getParameterValues(name)[0];}}