Java改写HttpServletRequest请求参数

为什么会有这个需求呢? 因为被 casAuthenticationFilter坑了

下一篇再说一下AuthenticationFilter的坑,这里主要说修改请求的参数

代码是从网上找的,找不到具体来源了,直接贴代码吧

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package com.birdzhang.plugin;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
/**
* @author birdzhang
*
*/
public class PrettyFacesWrappedRequest extends HttpServletRequestWrapper
{
private final Map<String, String[]> modifiableParameters;
private Map<String, String[]> allParameters = null;
/**
* Create a new request wrapper that will merge additional parameters into
* the request object without prematurely reading parameters from the
* original request.
*
* @param request
* @param additionalParams
*/
public PrettyFacesWrappedRequest(final HttpServletRequest request,
final Map<String, String[]> additionalParams)
{
super(request);
modifiableParameters = new HashMap<String, String[]>();
modifiableParameters.putAll(additionalParams);
}
@Override
public String getParameter(final String name)
{
String[] strings = getParameterMap().get(name);
if (strings != null)
{
return strings[0];
}
return super.getParameter(name);
}
@Override
public Map<String, String[]> getParameterMap()
{
if (allParameters == null)
{
allParameters = new TreeMap<String, String[]>();
Map<String, String[]> superMap = super.getParameterMap();
// 在这里根据你的需要修改
for (String key : superMap.keySet()) {
if(key.equals("ticket")) {
allParameters.put("token", superMap.get(key));
}else {
allParameters.put(key, superMap.get(key));
}
}
allParameters.putAll(modifiableParameters);
}
//Return an unmodifiable collection because we need to uphold the interface contract.
return Collections.unmodifiableMap(allParameters);
}
@Override
public Enumeration<String> getParameterNames()
{
return Collections.enumeration(getParameterMap().keySet());
}
@Override
public String[] getParameterValues(final String name)
{
return getParameterMap().get(name);
}
}

使用:

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Map<String, String[]> extraParams = new HashMap<String, String[]>();
HttpServletRequest wrappedRequest = new PrettyFacesWrappedRequest(request, extraParams);
request.getRequestDispatcher(request.getRequestURI()).forward(wrappedRequest, response);
return;

完美的将ticket参数替换为token参数