apatche组件的研究和使用

package cn.com.huawei.opensource.common.https.tools;

import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.Header;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.ByteArrayRequestEntity;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
/**
* 处理远程的请求的方法的应用
* @author bailonggang
* 2009-1-2
* 下午04:38:58
*/
public class HTTPClient {
/**
*
* @param httpurl
* @return
*/
public String  execute(String httpurl)
{
//构建HttpClient的实例的应用
HttpClient httpclient=new HttpClient();
//创建GET方法的实例
GetMethod getmethod=new GetMethod(httpurl);
//创建的POST方法的实例    PostMethod postmethod=new PostMethod(httpurl);

//使用系统提供的默认的恢复策略
getmethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
try {
//执行GET方法的请求的实例
int statusCode=httpclient.executeMethod(getmethod);
//查看响应的编码的方式
String responseEncoding=getmethod.getRequestCharSet();
System.out.println("the response encoding is :"+responseEncoding);
//检测发送是否成功的
if(statusCode!=HttpStatus.SC_OK)
{
System.out.println("Method failure:"+getmethod.getStatusLine());
}
//得到响应的消息体
byte[] responseBody=getmethod.getResponseBody();
return new String(responseBody);
} catch (HttpException e) {
          System.out.println("please check you provided http address！"+e);
}catch(IOException e)
{
//发生网络异常信息
e.printStackTrace();
}finally{
//释放连接
getmethod.releaseConnection();
}
return null;

}
/**
* 使用HttpClient调用远程servlet
* @param httpurl
* @param xmlInfo
* @param map
* @return
*/
@SuppressWarnings("unchecked")
public InputStream executeHttp(String httpurl, String xmlInfo,Map<String ,String> map) {
HttpClient httpclient = new HttpClient();
//使用Post发送消息的方法的应用
PostMethod postmethod = new PostMethod(httpurl);
ByteArrayRequestEntity  requestEntity=new ByteArrayRequestEntity(xmlInfo.getBytes(),"text/html; charset=UTF-8");
InputStream inputstream=null;
//设置请求的实体
postmethod.setRequestEntity(requestEntity);
//设置请求的格式
try {
//设置消息头信息
for (Iterator it =map.entrySet().iterator(); it.hasNext();)
{
Entry<String,String> header = (Entry<String,String>) it.next();
String key=header.getKey();
String value=header.getValue();
postmethod.setRequestHeader(key, value);
}
//发送消息的方法的
httpclient.executeMethod(postmethod);

//发送成功接受请求的信息
if(postmethod.getStatusCode()==HttpStatus.SC_OK)
{
inputstream=postmethod.getResponseBodyAsStream();
}else{
System.out.println("unexpected failure:"+postmethod.getStatusLine());
}

} catch (HttpException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
postmethod.releaseConnection();
}
return inputstream;
}
/**
* 使用HttpClient调用远程servlet
* @param httpurl
* @param xmlInfo
* @param map
* @return
*/
@SuppressWarnings("unchecked")
public InputStream executeHttp(String httpurl, Map<String,String> paramMaps,Map<String ,String> map) {
HttpClient httpclient = new HttpClient();
//使用Post发送消息的方法的应用
PostMethod postmethod = new PostMethod(httpurl);
InputStream inputstream=null;
//设置请求的填入各个表单域的值
List<NameValuePair> paramList=new ArrayList<NameValuePair>();
NameValuePair[] params=new NameValuePair[paramMaps.size()];
for (Iterator it =map.entrySet().iterator(); it.hasNext();)
{
Entry<String,String> header = (Entry<String,String>) it.next();
String key=header.getKey();
String value=header.getValue();
            NameValuePair  param=new NameValuePair();
            param.setName(key);
            param.setValue(value);
            paramList.add(param);
}
paramList.toArray(params);
postmethod.setRequestBody(params);
//设置请求的格式
try {
//设置消息头信息
for (Iterator it =map.entrySet().iterator(); it.hasNext();)
{
Entry<String,String> header = (Entry<String,String>) it.next();
String key=header.getKey();
String value=header.getValue();
postmethod.setRequestHeader(key, value);
}
//发送消息的方法的
  int statusCode=httpclient.executeMethod(postmethod);
  //自动转向的方式的应用
  //HttpClient对于要求接受后继服务的请求，象POST和PUT等不能自动处理转发301或者302
if(statusCode==HttpStatus.SC_MOVED_PERMANENTLY||statusCode==HttpStatus.SC_MOVED_TEMPORARILY)
{
Header locationHeader=postmethod.getRequestHeader("location");
String location=null;
if(locationHeader!=null)
{
location=locationHeader.getValue();
    System.out.println("the page was redirected to:"+location);
   
}else{
System.out.println("Location field value is null！");
}
}
//发送成功接受请求的信息
if(postmethod.getStatusCode()==HttpStatus.SC_OK)
{
inputstream=postmethod.getResponseBodyAsStream();
}else{
System.out.println("unexpected failure:"+postmethod.getStatusLine());
}
} catch (HttpException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
postmethod.releaseConnection();
}
return inputstream;
}
}


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