包装设计模式实现全站乱码过滤器

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郭先生

2 主题	1 听众	16 金钱

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电梯直达

楼主

发表于 2016-09-14 00:13:45 |只看该作者 |正序浏览

package cn.onecool.filter;

import java.io.IOException;
import java.util.Map;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class EncodingFilte implements Filter {
private FilterConfig config = null;
private ServletContext context = null;
private String encode = null;

public void init(FilterConfig filterConfig) throws ServletException {
this.config = filterConfig;
this.context = filterConfig.getServletContext();
this.encode = context.getInitParameter("encoding")==null? "utf-8" : context.getInitParameter("encoding");
}

public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {

// --响应乱码解决
response.setCharacterEncoding(encode);
response.setContentType("text/html;charset=" + encode);
// --利用装饰设计模式改变request对象和获取请求参数相关的方法,从而解决请求参数乱码问题
chain.doFilter(new MyHttpServletRequest((HttpServletRequest) request),
response);
}

public void destroy() {

}

private class MyHttpServletRequest extends HttpServletRequestWrapper {
private HttpServletRequest request = null;
private boolean isNotEncode = true;

public MyHttpServletRequest(HttpServletRequest request) {
super(request);
this.request = request;
}

@Override
public Map<String, String[]> getParameterMap() {
try {
if (request.getMethod().equalsIgnoreCase("POST")) {
request.setCharacterEncoding(encode);
return request.getParameterMap();
} else if (request.getMethod().equalsIgnoreCase("GET")) {
Map<String, String[]> map = request.getParameterMap();
if (isNotEncode) {
for (Map.Entry<String, String[]> entry : map.entrySet()) {
String[] vs = entry.getValue();
for (int i = 0; i < vs.length; i++) {
vs[i] = new String(vs[i].getBytes("iso8859-1"),
encode);
}
}
isNotEncode = false;
}
return map;
} else {
return request.getParameterMap();
}
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}

@Override
public String[] getParameterValues(String name) {
return getParameterMap().get(name);
}

@Override
public String getParameter(String name) {
return getParameterValues(name) == null ? null
: getParameterValues(name)[0];
}

}
}

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