java调用rest接口

package com.boco.gaia.service.mockalarm.util;

import java.io.IOException;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
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.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/** 
 * @Description 
 * @author 许凯勋
 * @date 2016年10月14日 下午4:04:11 
 */
/**
 * 分装一个http请求的工具类
 */
public class HttpClientUtil {
    
    private static final Logger log = LoggerFactory.getLogger(HttpClientUtil.class);
    
    /**
     * 初始化HttpClient
     */
    private CloseableHttpClient httpClient = HttpClients.createDefault();
    
    /**
     * POST方式调用
     * 
     * @param url
     * @param params 参数为NameValuePair键值对对象
     * @return 响应字符串
     * @throws java.io.UnsupportedEncodingException
     */
    public String executeByPOST(String url, List params) {
        HttpPost post = new HttpPost(url);
        
        ResponseHandler responseHandler = new BasicResponseHandler();
        String responseJson = null;
        try {
            if (params != null) {
                post.setEntity(new UrlEncodedFormEntity(params));
            }
            responseJson = httpClient.execute(post, responseHandler);
            log.info("HttpClient POST请求结果：" + responseJson);
        }
        catch (ClientProtocolException e) {
            e.printStackTrace();
            log.info("HttpClient POST请求异常：" + e.getMessage());
        }
        catch (IOException e) {
            e.printStackTrace();
        }
        finally {
            httpClient.getConnectionManager().closeExpiredConnections();
            httpClient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);
        }
        return responseJson;
    }
    
    /**
     * Get方式请求
     * 
     * @param url 带参数占位符的URL，例：http://ip/User/user/center.aspx?_action=GetSimpleUserInfo&codes={0}&email={1}
     * @param params 参数值数组，需要与url中占位符顺序对应
     * @return 响应字符串
     * @throws java.io.UnsupportedEncodingException
     */
    public String executeByGET(String url, Object[] params) {
        String messages = MessageFormat.format(url, params);
        HttpGet get = new HttpGet(messages);
        ResponseHandler responseHandler = new BasicResponseHandler();
        String responseJson = null;
        try {
            responseJson = httpClient.execute(get, responseHandler);
            log.info("HttpClient GET请求结果：" + responseJson);
        }
        catch (ClientProtocolException e) {
            e.printStackTrace();
            log.error("HttpClient GET请求异常：" + e.getMessage());
        }
        catch (IOException e) {
            e.printStackTrace();
            log.error("HttpClient GET请求异常：" + e.getMessage());
        }
        finally {
            httpClient.getConnectionManager().closeExpiredConnections();
            httpClient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);
        }
        return responseJson;
    }
    
    /**
     * @param url
     * @return
     */
    public String executeByGET(String url) {
        HttpGet get = new HttpGet(url);
        ResponseHandler responseHandler = new BasicResponseHandler();
        String responseJson = null;
        try {
            responseJson = httpClient.execute(get, responseHandler);
            log.info("HttpClient GET请求结果：" + responseJson);
        }
        catch (ClientProtocolException e) {
            e.printStackTrace();
            log.error("HttpClient GET请求异常：" + e.getMessage());
        }
        catch (IOException e) {
            e.printStackTrace();
            log.error("HttpClient GET请求异常：" + e.getMessage());
        }
        finally {
            httpClient.getConnectionManager().closeExpiredConnections();
            httpClient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);
        }
        return responseJson;
    }

    /**
     * PUT方式调用
     * 
     * @param url
     * @param params 参数为NameValuePair键值对对象
     * @return 响应字符串
     * @throws java.io.UnsupportedEncodingException
     */
    public String executeByPUT(String url, List params) {
        HttpPut put = new HttpPut(url);
        
        ResponseHandler responseHandler = new BasicResponseHandler();
        String responseJson = null;
        try {
            if (params != null) {
                put.setEntity(new UrlEncodedFormEntity(params));
            }
            responseJson = httpClient.execute(put, responseHandler);
            log.debug("HttpClient PUT请求结果：" + responseJson);
        }
        catch (Exception e) {
            log.error("HttpClient PUT请求异常：", e);
        }
        finally {
            httpClient.getConnectionManager().closeExpiredConnections();
            httpClient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);
        }
        return responseJson;
    }
    
    /**
     * DEL方式调用
     * 
     * @param url
     * @param params 参数为NameValuePair键值对对象
     * @return 响应字符串
     * @throws java.io.UnsupportedEncodingException
     */
    public String executeByDEL(String url, List params) {
        HttpDeleteWithBody del = new HttpDeleteWithBody(url);
        
        ResponseHandler responseHandler = new BasicResponseHandler();
        String responseJson = null;
        try {
            if (params != null) {
                del.setEntity(new UrlEncodedFormEntity(params));;
            }
            responseJson = httpClient.execute(del, responseHandler);
            log.debug("HttpClient DEL请求结果：" + responseJson);
        }
        catch (Exception e) {
            log.error("HttpClient DEL请求异常：", e);
        }
        finally {
            httpClient.getConnectionManager().closeExpiredConnections();
            httpClient.getConnectionManager().closeIdleConnections(30, TimeUnit.SECONDS);
        }
        return responseJson;
    }

}


class HttpDeleteWithBody  extends HttpEntityEnclosingRequestBase{

    @Override
    public String getMethod(){
        // TODO Auto-generated method stub
        return null;
    }
    public HttpDeleteWithBody(final String uri) {
        super();
        setURI(URI.create(uri));
    }
 
    public HttpDeleteWithBody(final URI uri) {
        super();
        setURI(uri);
    }
 
    public HttpDeleteWithBody() {
        super();
    }

}