httpClient访问远程接口工具类

package xmodule.test;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.util.EntityUtils;

/**
*

 

 * 功能：httpClient访问远程接口工具类 

 * 日期：2015年3月17日 上午11:19:21 

 * 

*/
@SuppressWarnings(“deprecation”)
public class HttpClientUtil {
public static void main(String[] args) {
String url = “ http://wechattest.nbmetro.com:8080/api/appstore/userInfo?accessToken=YJ26Gb5aFle0K7VyGaiMiOCeiu96YE4Q&openId=ffdzfHoUHfo5HHaa“;
String requestMethod = “get”;
String result = httpRequestToString(url, requestMethod, null, null);
System.out.println(result);
}

/**
 * <pre>
 * 方法体说明：向远程接口发起请求，返回字符串类型结果
 * @param url 接口地址
 * @param requestMethod 请求类型
 * @param params 传递参数
 * @return String 返回结果
 * </pre>
 */
public static String httpRequestToString(String url, String requestMethod,
        Map<String, String> params, String ...auth){
    //接口返回结果
    String methodResult = null;
    try {
        String parameters = "";
        boolean hasParams = false;
        //将参数集合拼接成特定格式，如name=zhangsan&age=24
        if(params!=null){
               for(String key : params.keySet()){
                   String value = URLEncoder.encode(params.get(key), "UTF-8");
                   parameters += key +"="+ value +"&";
                   hasParams = true;
               }
        }

        if(hasParams){
            parameters = parameters.substring(0, parameters.length()-1);
        }
        //是否为GET方式请求
        boolean isGet = "get".equalsIgnoreCase(requestMethod);
        boolean isPost = "post".equalsIgnoreCase(requestMethod);
        boolean isPut = "put".equalsIgnoreCase(requestMethod);
        boolean isDelete = "delete".equalsIgnoreCase(requestMethod);

        //创建HttpClient连接对象
        DefaultHttpClient client = new DefaultHttpClient();
        HttpRequestBase method = null;
        if(isGet){
            url += "?" + parameters;
            method = new HttpGet(url);
        }else if(isPost){
            method = new HttpPost(url);
            HttpPost postMethod = (HttpPost) method;
            StringEntity entity = new StringEntity(parameters);
            postMethod.setEntity(entity);
        }else if(isPut){
            method = new HttpPut(url);
            HttpPut putMethod = (HttpPut) method;
            StringEntity entity = new StringEntity(parameters);
            putMethod.setEntity(entity);
        }else if(isDelete){
            url += "?" + parameters;
            method = new HttpDelete(url);
        }
        method.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 6000);
        //设置参数内容类型
        method.addHeader("Content-Type","application/x-www-form-urlencoded");
        //httpClient本地上下文
        HttpClientContext context = null;
        if(!(auth==null || auth.length==0)){
            String username = auth[0];
            String password = auth[1];
            UsernamePasswordCredentials credt = new UsernamePasswordCredentials(username,password);
            //凭据提供器
            CredentialsProvider provider = new BasicCredentialsProvider();
            //凭据的匹配范围
            provider.setCredentials(AuthScope.ANY, credt);
            context = HttpClientContext.create();
            context.setCredentialsProvider(provider);
        }
        //访问接口，返回状态码
        HttpResponse response = client.execute(method, context);
        //返回状态码200，则访问接口成功
        if(response.getStatusLine().getStatusCode()==200){
            methodResult = EntityUtils.toString(response.getEntity());
        }
        client.close();
    }catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }catch (IOException e) {
        e.printStackTrace();
    }
    return methodResult;
}

}