javaWeb：通用网站的字符集编码过滤器

  1 package com.it.demo6;
  2 
  3 import java.io.IOException;
  4 import java.io.UnsupportedEncodingException;
  5 import java.util.Map;
  6 import javax.servlet.Filter;
  7 import javax.servlet.FilterChain;
  8 import javax.servlet.FilterConfig;
  9 import javax.servlet.ServletException;
 10 import javax.servlet.ServletRequest;
 11 import javax.servlet.ServletResponse;
 12 import javax.servlet.http.HttpServletRequest;
 13 import javax.servlet.http.HttpServletRequestWrapper;
 14 
 15 /**
 16  * 解决get和post请求 全部乱码
 17  * 
 18  * @author 店小二的酒
 19  * 
 20  */
 21 public class GenericEncodingFilter implements Filter {
 22 
 23     @Override
 24     public void destroy() {
 25     }
 26 
 27     @Override
 28     public void doFilter(ServletRequest request, ServletResponse response,
 29             FilterChain chain) throws IOException, ServletException {
 30         // 转型为与协议相关对象
 31         HttpServletRequest httpServletRequest = (HttpServletRequest) request;
 32         // 对request包装增强
 33         HttpServletRequest myrequest = new MyRequest(httpServletRequest);
 34         chain.doFilter(myrequest, response);
 35     }
 36 
 37     @Override
 38     public void init(FilterConfig filterConfig) throws ServletException {
 39     }
 40 
 41 }
 42 
 43 // 自定义request对象
 44 class MyRequest extends HttpServletRequestWrapper {
 45 
 46     private HttpServletRequest request;
 47 
 48     public MyRequest(HttpServletRequest request) {
 49         super(request);// super必须写
 50         this.request = request;
 51     }
 52 
 53     // 对需要增强方法 进行覆盖
 54     @Override
 55     public Map getParameterMap() {
 56         // 先获得请求方式
 57         String method = request.getMethod();
 58         if (method.equalsIgnoreCase("post")) {
 59             // post请求
 60             try {
 61                 // 处理post乱码
 62                 request.setCharacterEncoding("utf-8");
 63                 return request.getParameterMap();
 64             } catch (UnsupportedEncodingException e) {
 65                 e.printStackTrace();
 66             }
 67         } else if (method.equalsIgnoreCase("get")) {
 68             // get请求
 69             Map<String, String[]> parameterMap = request.getParameterMap();
 70             for (String parameterName : parameterMap.keySet()) {
 71                 String[] values = parameterMap.get(parameterName);
 72                 if (values != null) {
 73                     for (int i = 0; i < values.length; i++) {
 74                         try {
 75                             // 处理get乱码
 76                             if(values[i] != null){
 77                                 values[i] = new String(values[i].getBytes("ISO-8859-1"), "utf-8");
 78                             }
 79                         } catch (UnsupportedEncodingException e) {
 80                             e.printStackTrace();
 81                         }
 82                     }
 83                 }
 84             }
 85             return parameterMap;
 86         }
 87 
 88         return super.getParameterMap();
 89     }
 90 
 91     @Override
 92     public String getParameter(String name) {
 93         String method = request.getMethod();
 94         if("get".equalsIgnoreCase(method)){
 95             String value = request.getParameter(name);
 96             if (value != null) {
 97                 try {
 98                     value = new String(value.getBytes("ISO-8859-1"), "UTF-8");
 99                 } catch (UnsupportedEncodingException e) {
100                     e.printStackTrace();
101                 }
102             }
103             return value;
104         }else if("post".equalsIgnoreCase(method)){
105             try {
106                 request.setCharacterEncoding("UTF-8");
107             } catch (UnsupportedEncodingException e) {
108                 e.printStackTrace();
109             }
110         }
111         return super.getParameter(name);
112     }
113 
114     @Override
115     public String[] getParameterValues(String name) {
116         Map<String, String[]> parameterMap = getParameterMap();
117         String[] values = parameterMap.get(name);
118         return values;
119     }
120 
121 }
 　　　　稍微测试了下,没有错误!具体怎么样不知道!