Jfilter统一编码工具类

来源：互联网发布：淘宝1块包邮的有什么编辑：程序博客网时间：2024/06/09 14:14
package cn.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;import javax.servlet.http.HttpServletResponse;/** * 统一编码 * @author Administrator * */public class EncodingFilter implements Filter {    @Override    public void init(FilterConfig filterConfig) throws ServletException {        // TODO Auto-generated method stub    }    @Override    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {        //1.强转        HttpServletRequest request=(HttpServletRequest) req;        HttpServletResponse response=(HttpServletResponse) resp;        //2.放行        chain.doFilter(new MyRequest(request), response);    }    @Override    public void destroy() {        // TODO Auto-generated method stub    }}class MyRequest extends HttpServletRequestWrapper{    private HttpServletRequest request;    private boolean flag=true;    public MyRequest(HttpServletRequest request) {        super(request);        this.request=request;    }    @Override    public String getParameter(String name) {          if(name==null || name.trim().length()==0){            return null;        }        String[] values = getParameterValues(name);        if(values==null || values.length==0){            return null;        }        return values[0];    }    @Override    /**     * hobby=[eat,drink]     */    public String[] getParameterValues(String name) {        if(name==null || name.trim().length()==0){            return null;        }        Map<String, String[]> map = getParameterMap();        if(map==null || map.size()==0){            return null;        }        return map.get(name);    }    @Override    /**     * map{ username=[tom],password=[123],hobby=[eat,drink]}     */    public Map<String,String[]> getParameterMap() {          /**         * 首先判断请求方式         * 若为post  request.setchar...(utf-8)         * 若为get 将map中的值遍历编码就可以了         */        String method = request.getMethod();        if("post".equalsIgnoreCase(method)){            try {                request.setCharacterEncoding("utf-8");                return request.getParameterMap();            } catch (UnsupportedEncodingException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }        }else if("get".equalsIgnoreCase(method)){            Map<String,String[]> map = request.getParameterMap();            if(flag){                for (String key:map.keySet()) {                    String[] arr = map.get(key);                    //继续遍历数组                    for(int i=0;i<arr.length;i++){                        //编码                        try {                            arr[i]=new String(arr[i].getBytes("iso8859-1"),"utf-8");                        } catch (UnsupportedEncodingException e) {                            e.printStackTrace();                        }                    }                }                flag=false;            }            //需要遍历map 修改value的每一个数据的编码            return map;        }        return super.getParameterMap();    }}
阅读全文
0 0