Java Web解决Post和Get混合乱码

最新推荐文章于 2023-11-13 09:03:37 发布

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本文介绍了一种通过DealGetEncodingFilter过滤器处理HTTP GET请求中参数编码的方法。该过滤器能够解析请求中的参数字符串，使用指定的编码方式（如UTF-8）进行解码，并对参数进行统一编码处理，确保客户端传递的参数能够在服务器端正确解析。

主要用两个方法：getQueryString()和getParameterMap()

package com.scjmjd.struts.filter;

import java.io.IOException;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
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;

public class DealGetEncodingFilter implements Filter{

private FilterConfig filterConfig = null;

@Override
public void destroy() {
this.filterConfig = null;
}

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

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

request.setCharacterEncoding(encoding);

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

HttpServletRequest httpRequest = (HttpServletRequest)request;

//获取GET参数字符串
String getParamStr = httpRequest.getQueryString();

//放置GET参数的键和值(存在多个值)
Map<String, List<String>> getParamMap = new HashMap<String, List<String>>();

if(getParamStr != null){

String [] getParamArr = getParamStr.split("&");

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

String [] keyVal = getParamArr[i].split("=");

if(getParamMap.get(keyVal[0]) == null){

List<String> listVal = new ArrayList<String>();

listVal.add(keyVal[1]);

getParamMap.put(keyVal[0], listVal);

}else{

List<String> listVal = getParamMap.get(keyVal[0]);

listVal.add(keyVal[1]);

}
}
}

//获取所有参数
Map<String, Object> paramMap =httpRequest.getParameterMap();

//遍历Get传送的键值
for(String key : getParamMap.keySet()){

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

List<String> getParamVals = getParamMap.get(key);

for(int n=0;n<paramVals.length;n++){

//System.out.println("prep"+paramVals[n]);

for(int m=0;m<getParamVals.size();m++){

//System.out.println("all"+paramVals[n]+"\t"+"only"+getParamVals.get(m));

//尝试将所有参数转码
String paramValEncode = new String(paramVals[n].getBytes("iso-8859-1"),encoding);

//尝试地址栏参数转码
String getParamvalEncode = URLDecoder.decode(getParamVals.get(m),encoding);

//尝试转码后的字符是否一样
if(paramValEncode.equals(getParamvalEncode)){

//System.out.println("prep"+paramVals[n]);
//转换编码
paramVals[n] = new String(paramVals[n].getBytes("iso-8859-1"),encoding);

//System.out.println("next"+paramVals[n]);
}
}
}
}

chain.doFilter(request, response);

}

@Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
this.filterConfig = filterConfig;
}

}

<filter>
<filter-name>CharacterEncoding</filter-name>
<filter-class>com.scjmjd.struts.filter.DealGetEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncoding</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>