java在request中添加或者修改header_太空守望者

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java在request中添加或者修改header

(2014-01-24 22:58:12)

分类： java

可以在Filter对Request做包装

上代码:

Filter部分

package test;

import java.io.IOException;

import java.util.Enumeration;

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 TestFilter implements Filter{

public void destroy() {

}

public void doFilter(ServletRequest request, ServletResponse response,

FilterChain fc) throws IOException, ServletException {

HttpServletRequest oldRequest = (HttpServletRequest) request;

// 打印原始数据

System.out.println("OLD REQUEST HEADER:");

Enumeration enumeration = oldRequest.getHeaderNames();

while(enumeration.hasMoreElements()) {

String name = (String) enumeration.nextElement();

System.out.println(name + "=" + oldRequest.getHeader(name));

}

// 包装新的客户化Request

ChangedRequest newRequest = new ChangedRequest(oldRequest);

// 添加新的HEADER

newRequest.addHeader("TestMyHeader", "This is a test");

fc.doFilter(newRequest, response);

}

public void init(FilterConfig arg0) throws ServletException {

}

Request包装类:

package test;

import java.util.Enumeration;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletRequestWrapper;

public class ChangedRequest extends HttpServletRequestWrapper implements Enumeration{

private Map headerMap;

public ChangedRequest(HttpServletRequest request) {

super(request);

// 提取原本的HEADER内容

Enumeration enumeration = request.getHeaderNames();

headerMap = new HashMap();

while(enumeration.hasMoreElements()) {

String name = (String) enumeration.nextElement();

headerMap.put(name, request.getHeader(name));

}

public Map getHeaderMap() {

return headerMap;

}

public void setHeaderMap(Map headerMap) {

this.headerMap = headerMap;

}

public void addHeader(String name,String value) {

headerMap.put(name, value);

}

@Override

public String getHeader(String name) {

return headerMap.get(name);

}

@Override

public Enumeration getHeaderNames() {

return this;

}

@Override

public Enumeration getHeaders(String name) {

return null;

};

Set mapKeySet;

Iterator mapKeySetIt;

public boolean hasMoreElements() {

if(mapKeySet == null) {

mapKeySet = headerMap.keySet();

mapKeySetIt = mapKeySet.iterator();

}

return mapKeySetIt.hasNext();

}

public String nextElement() {

return mapKeySetIt.next();

}

servlet测试代码:

package test;

import java.io.IOException;

import java.util.Enumeration;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class Test extends HttpServlet {

public void service(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

System.out.println();

System.out.println("CHANGED REQUEST HEADER:");

Enumeration enumeration = request.getHeaderNames();

while(enumeration.hasMoreElements()) {

String name = (String) enumeration.nextElement();

System.out.println(name + "=" + request.getHeader(name));

}

在你的servlet上采用这个Filter,就可以自己去添加Header部分

以下是测试打印内容

OLD REQUEST HEADER:

accept=text/html, application/xhtml+xml, **

user-agent=Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)

accept-encoding=gzip, deflate

TestMyHeader=This is a test

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