javaWeb：通用网站的字符集编码过滤器

package com.it.demo6;

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get和post请求 全部乱码
 * 
 * @author 店小二的酒
 * 
 */
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;

    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<String, String[]> parameterMap = request.getParameterMap();
            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
                            if(values[i] != null){
                                values[i] = new String(values[i].getBytes("ISO-8859-1"), "utf-8");
                            }
                        } catch (UnsupportedEncodingException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
            return parameterMap;
        }

        return super.getParameterMap();
    }

    @Override
    public String getParameter(String name) {
        String method = request.getMethod();
        if("get".equalsIgnoreCase(method)){
            String value = request.getParameter(name);
            if (value != null) {
                try {
                    value = new String(value.getBytes("ISO-8859-1"), "UTF-8");
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                }
            }
            return value;
        }else if("post".equalsIgnoreCase(method)){
            try {
                request.setCharacterEncoding("UTF-8");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
        }
        return super.getParameter(name);
    }

    @Override
    public String[] getParameterValues(String name) {
        Map<String, String[]> parameterMap = getParameterMap();
        String[] values = parameterMap.get(name);
        return values;
    }

}
 　　　　稍微测试了下,没有错误!具体怎么样不知道!