package cn.org.du.Encode;

import java.io.IOException;

import java.util.Map;

import java.util.Set;

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.HttpServletResponse;

public class EncodeFilter implements Filter {

private FilterConfig filterConfig = null;

public void destroy() {

this.filterConfig = null;

}

@SuppressWarnings("unchecked")

public void doFilter(ServletRequest req, ServletResponse response,

FilterChain chain) throws IOException, ServletException {

String encoding = this.filterConfig.getInitParameter("encoding");

HttpServletRequest request = (HttpServletRequest) req;

HttpServletResponse resp = (HttpServletResponse) response;

request.setCharacterEncoding(encoding);

resp.setContentType("text/html;charset="+encoding);

// System.out.println(request.getQueryString());

// 处理GET参数

if (request.getMethod().equalsIgnoreCase("get")) {

Map paramMap = req.getParameterMap();

String[] queryStringArray = { "" };

if (request.getQueryString() != null) {

queryStringArray = request.getQueryString().split("&");

}

for (int i = 0; i < queryStringArray.length; i++) {

queryStringArray[i] = queryStringArray[i].replaceAll("(.*)=(.*)", "$1");

}

Set<String> keySet = paramMap.keySet();

for (String key : keySet) {

// check where param from

boolean isFromGet = false;

for (String paramFromGet : queryStringArray) {

if (key.equals(paramFromGet)) {

isFromGet = true;

}

}

if (!isFromGet) {

continue;

}

String[] paramArray = (String[]) paramMap.get(key);

for (int i = 0; i < paramArray.length; i++) {

paramArray[i] = new String(paramArray[i].getBytes("iso-8859-1"), encoding);

}

}

}

chain.doFilter(req, resp);

}

public void init(FilterConfig filterConfig) throws ServletException {

this.filterConfig = filterConfig;

}

}

 

-----------------web.xml配置---------------------

<filter>

<filter-name>encodeFilter</filter-name>

<filter-class>cn.org.du.Encode.EncodeFilter</filter-class>

<init-param>

<param-name>encoding</param-name>

<param-value>utf-8</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>encodeFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>