encodeFilter
         
     
      com.glut.web.filter.GenericEncodingFilter
       
      
        
     
      encodeFilter
         
     
      /*
       
    

package com.glut.web.filter;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.util.Map;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.HttpServletRequestWrapper;/** * 解决乱码显示 * @author qichunlin * */public class GenericEncodingFilter implements Filter {    @Override    public void destroy() {    }    @Override    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)            throws IOException, ServletException {        // 转型为与协议相关对象        HttpServletRequest httpServletRequest = (HttpServletRequest) request;        // 对request包装增强        HttpServletRequest myrequest = new MyRequest(httpServletRequest);        chain.doFilter(myrequest, response);    }    @Override    public void init(FilterConfig filterConfig) throws ServletException {    }}// 自定义request对象class MyRequest extends HttpServletRequestWrapper {    private HttpServletRequest request;    private boolean hasEncode;    public MyRequest(HttpServletRequest request) {        super(request);// super必须写        this.request = request;    }    // 对需要增强方法 进行覆盖    @Override    public Map getParameterMap() {        // 先获得请求方式        String method = request.getMethod();        if (method.equalsIgnoreCase("post")) {            // post请求            try {                // 处理post乱码                request.setCharacterEncoding("utf-8");                return request.getParameterMap();            } catch (UnsupportedEncodingException e) {                e.printStackTrace();            }        } else if (method.equalsIgnoreCase("get")) {            // get请求            Map
    
      parameterMap = request.getParameterMap();            if (!hasEncode) { // 确保get手动编码逻辑只运行一次                for (String parameterName : parameterMap.keySet()) {                    String[] values = parameterMap.get(parameterName);                    if (values != null) {                        for (int i = 0; i < values.length; i++) {                            try {                                // 处理get乱码                                values[i] = new String(values[i].getBytes("ISO-8859-1"), "utf-8");                            } catch (UnsupportedEncodingException e) {                                e.printStackTrace();                            }                        }                    }                }                hasEncode = true;            }            return parameterMap;        }        return super.getParameterMap();    }    @Override    public String getParameter(String name) {        Map
     
       parameterMap = getParameterMap();        String[] values = parameterMap.get(name);        if (values == null) {            return null;        }        return values[0]; // 取回参数的第一个值    }    @Override    public String[] getParameterValues(String name) {        Map
      
        parameterMap = getParameterMap();        String[] values = parameterMap.get(name);        return values;    }}