在Struts1的一般方法中，使用ThreadLocal获取response，request，session

1：ThreadLocal 方法

package com.rtt.cppcc.basicinfo.util;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class ServletUtil {

private ServletContext context;
private HttpServletRequest request;
private HttpServletResponse response;
private HttpSession session;

private final static ThreadLocal<ServletUtil> contexts = new ThreadLocal<ServletUtil>();

/**
* 初始化请求上下文
* @param ctx
* @param req
* @param res
*/
public static ServletUtil begin(ServletContext ctx, HttpServletRequest req, HttpServletResponse res) {
  ServletUtil rc = new ServletUtil();
  rc.context = ctx;
  rc.request = req;
  rc.response = res;
  rc.session = req.getSession(false);

  contexts.set(rc);
  return rc;
}

/**
* 获取当前请求的上下文
* @return
*/
public static ServletUtil get(){
  return contexts.get();
}

public void end() {
  this.context = null;
  this.request = null;
  this.response = null;
  this.session = null;
  contexts.remove();
}

public HttpSession getSession() {
return session;
}

public void setSession(HttpSession session) {
this.session = session;
}

public ServletContext getContext() {
return context;
}

public void setContext(ServletContext context) {
this.context = context;
}

public HttpServletRequest getRequest() {
return request;
}

public void setRequest(HttpServletRequest request) {
this.request = request;
}

public HttpServletResponse getResponse() {
return response;
}

public void setResponse(HttpServletResponse response) {
this.response = response;
}
}

2:过滤器

package com.rtt.cppcc.basicinfo.util;

import java.io.IOException;

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.HttpServletResponse;

public class ServletFilter implements Filter {
private ServletContext context;
@Override
public void destroy() {
// TODO Auto-generated method stub
ServletUtil.get().end();//清除线程变量值

}

@Override
public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain chain) throws IOException, ServletException {
  // TODO Auto-generated method stub
  HttpServletRequest req = (HttpServletRequest)request;
  HttpServletResponse res = (HttpServletResponse)response;
  ServletUtil.begin(this.context, req, res);//初始化线程变量值
  chain.doFilter(request, response);
}

@Override
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub

}

}

3：在web.xml 中配置过滤器

<filter>
  <filter-name>Response</filter-name>
  <filter-class>com.rtt.cppcc.basicinfo.util.ServletFilter</filter-class>
</filter>
<filter-mapping>
  <filter-name>Response</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

4::获取对象

HttpServletResponse res = (HttpServletResponse) ServletUtil.get().getResponse();

参考地址：https://my.oschina.net/yyqz/blog/277359

在Struts1的一般方法中，使用ThreadLocal获取response，request，session

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