URL对象连接url并获取值

xly1981

新老系统同时运行，在请求发往新系统时，通过filter方式吧request中的参数转发到老系统中，老系统返回的页面中的token被找出并保留，在提交form并再转发到老系统时重新写入。
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.UnknownHostException;

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

public class ConnectUrlTool {
private HttpServletRequest request;
private HttpServletResponse response;
private HttpURLConnection urlconn;
private String address;
private int timeOut=3000000;
private String sessionId;
private String tokenId;
private String params;


public ConnectUrlTool(){

}

public void setInfo(HttpServletRequest request,HttpServletResponse response,boolean addToken){
this.request=request;
this.response=response;
ParamTools paramTools = new ParamTools();
    paramTools.initParam(request);
      if(!addToken){
      this.tokenId=null;
      }
      else if(null!=this.tokenId && addToken){
      paramTools.addParam("org.apache.struts.taglib.html.TOKEN", this.tokenId);
      }
    this.params=paramTools.getUrlValue();
}


/**
* 发送参数params (like a=ds&b=asd&),地址为:address(like http://www.sina.com.cn)
* @param address
* @throws IOException
*/
public void sendToOld(String address)throws IOException{
this.address=address;
BufferedInputStream   bis =sendRequest(params);
byte[] buffer = new byte[8092];
StringBuffer sb=new StringBuffer("");
int bytesRead = 0;
    while ((bytesRead = bis.read(buffer)) != -1) {
      String chunk = new String(buffer, 0, bytesRead);
//      System.out.print(chunk);
      sb.append(chunk);
    }
getTokenId(sb.toString(),"org.apache.struts.taglib.html.TOKEN");
if(bis!=null)
   {
   bis.close();  
   }
   urlconn.disconnect();
}
/**
* 返回的数据在BufferedInputStream
* @param params
* @return
* @throws IOException
*/
private BufferedInputStream sendRequest(String params) throws IOException
{
URL url = new URL(address);     
urlconn= this.getHttpConnect(address);
urlconn.setDoOutput(true);   
urlconn.setRequestMethod("POST");
urlconn.connect();
BufferedInputStream   bis   =   null;     
OutputStream os = urlconn.getOutputStream();      
os.write(params.toString().getBytes("utf-8"));      
os.flush();
os.close();   
int   code   =   urlconn.getResponseCode();
System.out.println("error   code   "+   code);
    if(code == HttpURLConnection.HTTP_OK)   
    {   
       bis = new BufferedInputStream(urlconn.getInputStream());  
}
    return bis;
}
/**
* 创建连接对象
* @param url
* @return
* @throws UnknownHostException
*/
private HttpURLConnection getHttpConnect(String url) throws UnknownHostException
{
try
{
urlconn = (HttpURLConnection)new URL(url).openConnection();
urlconn.setConnectTimeout(timeOut);
urlconn.setReadTimeout(timeOut);
}
catch (MalformedURLException e)
{
e.printStackTrace();

}
catch (IOException e)
{
e.printStackTrace();
}
if (urlconn == null)
throw new UnknownHostException();

return urlconn;
}
/**
* 从返回的页面中找到input 的name对应的value的值
* @param str
* @param name
*/
private  void getTokenId(String str,String name){
String tokenId="";
String[] splitStr=str.split("<");
boolean find=false;
for(int i=0;i<splitStr.length;i++){
delKg(splitStr[i]);
String[] temp=splitStr[i].split(" ");
int len=0;
if(temp[0].equalsIgnoreCase("input")){
for(int j=0;j<temp.length;j++){
String[] temp1=temp[j].split("=");
for(int k=0;k<temp1.length;k++){
if(temp1[0].length()==4 && temp1[0].substring(0, 4).equalsIgnoreCase("name")){
String[] temp2=temp1[1].split("\"");
if(temp2[1].equalsIgnoreCase(name)){
len=i;
}
}
if(len==i)break;
}
if(len==i)break;
}
if(len==0)continue;
for(int j=0;j<temp.length;j++){
String[] temp1=temp[j].split("=");
for(int k=0;k<temp1.length;k++){
if(temp1[0].length()==5 && temp1[0].substring(0, 5).equalsIgnoreCase("value")){
String[] temp2=temp1[1].split("\"");
this.tokenId=temp2[1];
break;
}
}
}
if(len==i)break;
}
}
}

private  String delKg(String  a){
    a = a.trim();
    while(a.startsWith(" ")){
       a = a.substring(1,a.length()).trim();
    }
    while(a.endsWith(" ")){
       a = a.substring(0,a.length()-1).trim();
    }
    return a;
  }
}