HttpClient (POST GET PUT)请求

package com.curender.web.server.http;

import java.io.IOException;
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.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.PutMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.curender.dal.util.ConstantsDal;

/**
* HttpClient GET POST PUT 请求
* @author huang
* @date 2013-4-10
*/
public class HttpRequest
{

protected static Log log = LogFactory.getLog(HttpRequest.class);
private static HttpRequest httpRequst=null;
private HttpRequest(){}
public static HttpRequest getInstance(){
if(httpRequst==null){
synchronized(HttpRequest.class){
if(httpRequst == null){
httpRequst=new HttpRequest();
}
}
}
return httpRequst;
}

/**
* HttpClient GET请求
* @author huang
* @date 2013-4-9
* @param uri
* @return resStr 请求返回的JSON数据
*/
public String doGet(String uri){
String resStr = null;
HttpClient htpClient = new HttpClient();
GetMethod getMethod = new GetMethod(ConstantsDal.SERVER_URL+uri);
getMethod.getParams().setParameter( HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
try{
int statusCode = htpClient.executeMethod( getMethod );
// log.info(statusCode);
if(statusCode != HttpStatus.SC_OK){
log.error("Method failed: "+getMethod.getStatusLine());
return resStr;
}
byte[] responseBody = getMethod.getResponseBody();
resStr = new String(responseBody,HttpConstants.ENCODED);
} catch (HttpException e) {
log.error("Please check your provided http address!"); //发生致命的异常，可能是协议不对或者返回的内容有问题
} catch (IOException e) {
log.error( "Network anomaly" ); //发生网络异常
}finally{
getMethod.releaseConnection(); //释放连接
}
return resStr;
}

/**
* HttpClient POST请求
* @author huang
* @date 2013-4-9
* @param s_user
* @return resStr 请求返回的JSON数据
*/
@SuppressWarnings( "deprecation" )
public String doPost(String uri,String jsonObj){
String resStr = null;
HttpClient htpClient = new HttpClient();
PostMethod postMethod = new PostMethod(ConstantsDal.SERVER_URL+uri);
postMethod.addRequestHeader( "Content-Type","application/json" );
postMethod.getParams().setParameter( HttpMethodParams.HTTP_CONTENT_CHARSET, HttpConstants.ENCODED );
postMethod.setRequestBody( jsonObj );
try{
int statusCode = htpClient.executeMethod( postMethod );
// log.info(statusCode);
if(statusCode != HttpStatus.SC_OK){
//post和put不能自动处理转发 301：永久重定向，告诉客户端以后应从新地址访问 302：Moved Temporarily
if(statusCode == HttpStatus.SC_MOVED_PERMANENTLY||statusCode == HttpStatus.SC_MOVED_TEMPORARILY){
Header locationHeader = postMethod.getResponseHeader( "location" );
String location = null;
if(locationHeader!=null){
location = locationHeader.getValue();
log.info("The page was redirected to :"+location);
}else{
log.info("Location field value is null");
}
}else{
log.error("Method failed: "+postMethod.getStatusLine());
}
return resStr;
}
byte[] responseBody = postMethod.getResponseBody();
resStr = new String(responseBody,HttpConstants.ENCODED);
}catch(Exception e){
e.printStackTrace();
}finally{
postMethod.releaseConnection();
}
return resStr;
}

/**
* HttpClient PUT请求
* @author huang
* @date 2013-4-10
* @return
*/
@SuppressWarnings( "deprecation" )
public String doPut(String uri,String jsonObj){
String resStr = null;
HttpClient htpClient = new HttpClient();
PutMethod putMethod = new PutMethod(ConstantsDal.SERVER_URL+uri);
putMethod.addRequestHeader( "Content-Type","application/json" );
putMethod.getParams().setParameter( HttpMethodParams.HTTP_CONTENT_CHARSET, HttpConstants.ENCODED );
putMethod.setRequestBody( jsonObj );
try{
int statusCode = htpClient.executeMethod( putMethod );
// log.info(statusCode);
if(statusCode != HttpStatus.SC_OK){
log.error("Method failed: "+putMethod.getStatusLine());
return null;
}
byte[] responseBody = putMethod.getResponseBody();
resStr = new String(responseBody,HttpConstants.ENCODED);
}catch(Exception e){
e.printStackTrace();
}finally{
putMethod.releaseConnection();
}
return resStr;
}
}