使用HttpClient发送Post Http请求

最近需要使用java对Rest接口进行调用，也就是直接使用java直接发送Post, Get, Put, Delete等请求。

印象中可以使用Apache Common下的HttpClient来做，结果HttpClient已经独立成了HttpComponent，编码方式也有所改变。

Google出来的很多文章多数是common-httpclient的方式，在新版本中不怎么适用。经过一番研究自己做了一下封装:

package cn.com.dayang.auth;  
  
import java.io.IOException;  
import java.io.UnsupportedEncodingException;  
import java.util.ArrayList;  
import java.util.List;  
import java.util.Map;  
import java.util.Set;  
  
import org.apache.http.HttpEntity;  
import org.apache.http.HttpResponse;  
import org.apache.http.NameValuePair;  
import org.apache.http.ParseException;  
import org.apache.http.client.ClientProtocolException;  
import org.apache.http.client.entity.UrlEncodedFormEntity;  
import org.apache.http.client.methods.HttpGet;  
import org.apache.http.client.methods.HttpPost;  
import org.apache.http.client.methods.HttpUriRequest;  
import org.apache.http.impl.client.DefaultHttpClient;  
import org.apache.http.message.BasicNameValuePair;  
import org.apache.http.protocol.HTTP;  
import org.apache.http.util.EntityUtils;  
import org.apache.log4j.Logger;  
  
  
public class HttpXmlClient {  
    private static Logger log = Logger.getLogger(HttpXmlClient.class);  
      
    public static String post(String url, Map<String, String> params) {  
        DefaultHttpClient httpclient = new DefaultHttpClient();  
        String body = null;  
          
        log.info("create httppost:" + url);  
        HttpPost post = postForm(url, params);  
          
        body = invoke(httpclient, post);  
          
        httpclient.getConnectionManager().shutdown();  
          
        return body;  
    }  
      
    public static String get(String url) {  
        DefaultHttpClient httpclient = new DefaultHttpClient();  
        String body = null;  
          
        log.info("create httppost:" + url);  
        HttpGet get = new HttpGet(url);  
        body = invoke(httpclient, get);  
          
        httpclient.getConnectionManager().shutdown();  
          
        return body;  
    }  
          
      
    private static String invoke(DefaultHttpClient httpclient,  
            HttpUriRequest httpost) {  
          
        HttpResponse response = sendRequest(httpclient, httpost);  
        String body = paseResponse(response);  
          
        return body;  
    }  
  
    private static String paseResponse(HttpResponse response) {  
        log.info("get response from http server..");  
        HttpEntity entity = response.getEntity();  
          
        log.info("response status: " + response.getStatusLine());  
        String charset = EntityUtils.getContentCharSet(entity);  
        log.info(charset);  
          
        String body = null;  
        try {  
            body = EntityUtils.toString(entity);  
            log.info(body);  
        } catch (ParseException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
          
        return body;  
    }  
  
    private static HttpResponse sendRequest(DefaultHttpClient httpclient,  
            HttpUriRequest httpost) {  
        log.info("execute post...");  
        HttpResponse response = null;  
          
        try {  
            response = httpclient.execute(httpost);  
        } catch (ClientProtocolException e) {  
            e.printStackTrace();  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
        return response;  
    }  
  
    private static HttpPost postForm(String url, Map<String, String> params){  
          
        HttpPost httpost = new HttpPost(url);  
        List<NameValuePair> nvps = new ArrayList <NameValuePair>();  
          
        Set<String> keySet = params.keySet();  
        for(String key : keySet) {  
            nvps.add(new BasicNameValuePair(key, params.get(key)));  
        }  
          
        try {  
            log.info("set utf-8 form entity to httppost");  
            httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));  
        } catch (UnsupportedEncodingException e) {  
            e.printStackTrace();  
        }  
          
        return httpost;  
    }  
}  

package cn.com.dayang.auth;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.apache.log4j.Logger;


public class HttpXmlClient {
	private static Logger log = Logger.getLogger(HttpXmlClient.class);
	
	public static String post(String url, Map<String, String> params) {
		DefaultHttpClient httpclient = new DefaultHttpClient();
		String body = null;
		
		log.info("create httppost:" + url);
		HttpPost post = postForm(url, params);
		
		body = invoke(httpclient, post);
		
		httpclient.getConnectionManager().shutdown();
		
		return body;
	}
	
	public static String get(String url) {
		DefaultHttpClient httpclient = new DefaultHttpClient();
		String body = null;
		
		log.info("create httppost:" + url);
		HttpGet get = new HttpGet(url);
		body = invoke(httpclient, get);
		
		httpclient.getConnectionManager().shutdown();
		
		return body;
	}
		
	
	private static String invoke(DefaultHttpClient httpclient,
			HttpUriRequest httpost) {
		
		HttpResponse response = sendRequest(httpclient, httpost);
		String body = paseResponse(response);
		
		return body;
	}

	private static String paseResponse(HttpResponse response) {
		log.info("get response from http server..");
		HttpEntity entity = response.getEntity();
		
		log.info("response status: " + response.getStatusLine());
		String charset = EntityUtils.getContentCharSet(entity);
		log.info(charset);
		
		String body = null;
		try {
			body = EntityUtils.toString(entity);
			log.info(body);
		} catch (ParseException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		return body;
	}

	private static HttpResponse sendRequest(DefaultHttpClient httpclient,
			HttpUriRequest httpost) {
		log.info("execute post...");
		HttpResponse response = null;
		
		try {
			response = httpclient.execute(httpost);
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return response;
	}

	private static HttpPost postForm(String url, Map<String, String> params){
		
		HttpPost httpost = new HttpPost(url);
		List<NameValuePair> nvps = new ArrayList <NameValuePair>();
		
		Set<String> keySet = params.keySet();
		for(String key : keySet) {
			nvps.add(new BasicNameValuePair(key, params.get(key)));
		}
		
		try {
			log.info("set utf-8 form entity to httppost");
			httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		
		return httpost;
	}
}

如何调用:

Map<String, String> params = new HashMap<String, String>();  
params.put("name", name);  
params.put("password", password);  
      
String xml = HttpXmlClient.post(loginUrl, params);  
log.info(xml);