HttpUtils は外部インターフェイスを呼び出します

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * HTTPS工具类.
 * 
 */
public class HttpUtils {
    
    
    
    private static Logger logger = LoggerFactory.getLogger(HttpUtils.class);
    
    private final static int HTTP_ERROR_CODE = 400;

    /**
     * 发送GET请求.
     * 
     * @param url
     * @param param
     * @return
     */
    public static String sendGet(String url, Map<String, String> paramMap, Map<String, String> headerMap) {
    
    
        String result = "";// 结果内容
        // 绑定参数
        if(paramMap != null && !paramMap.isEmpty()){
    
    
            url = url + "?" + createLinkString(paramMap);
        }
        try{
    
    
            // 获取连接
            HttpURLConnection httpConn = getHttpURLConnection(url, "GET", headerMap);
            // 获取返回结果
            if (httpConn.getResponseCode() >= HTTP_ERROR_CODE) {
    
    
                result = getResultFromStream(httpConn.getErrorStream());
            } else {
    
    
                result = getResultFromStream(httpConn.getInputStream());
            }
        }catch(Exception e){
    
    
            logger.error(url + paramMap.toString() + "发送GET请求出现异常！", e);
        }

        return result;
    }

    /**
     * 发送POST请求.
     * 
     * @param url
     * @param param
     * @param token 
     * @return
     */
    public static String sendPost(String url, String param, Map<String, String> headerMap) {
    
    
        String result = "";// 结果内容
        try{
    
    
            // 获取连接
            HttpURLConnection httpConn = getHttpURLConnection(url, "POST", headerMap);
            // 设置文件长度
            httpConn.setRequestProperty("Content-Length", StringUtils.isEmpty(param) ? "0" : String.valueOf(param.getBytes().length));
            // 添加参数信息
            setParamToStream(httpConn.getOutputStream(), StringUtils.isEmpty(param) ? "" : param);
            // 获取返回结果
            if (httpConn.getResponseCode() >= HTTP_ERROR_CODE) {
    
    
                result = getResultFromStream(httpConn.getErrorStream());
            } else {
    
    
                result = getResultFromStream(httpConn.getInputStream());
            }
        }catch(Exception e){
    
    
            logger.error(url + param + "发送POST请求出现异常！", e);
        }
        
        return result;
    }

    /**
     * 获取请求连接.
     * 
     * @param url
     * @param method
     * @param token
     * @return
     * @throws IOException
     */
    private static HttpURLConnection getHttpURLConnection(String url, String method, Map<String, String> headerMap) throws IOException {
    
    
        URL httpUrl = new URL(url);
        HttpURLConnection httpConn = (HttpURLConnection) httpUrl.openConnection();
        httpConn.setRequestMethod(method);
        // post请求参数
        if("POST".equals(method.toUpperCase())){
    
    
            httpConn.setDoInput(true);
            httpConn.setDoOutput(true);
        }
        httpConn.setRequestProperty("accept", "*/*");
        httpConn.setRequestProperty("connection", "Keep-Alive");
        httpConn.setRequestProperty("Content-Type", "application/json;charset=UTF-8");
        // header中添加的内容
        if(headerMap != null && !headerMap.isEmpty()){
    
    
            for (String key : headerMap.keySet()) {
    
    
                httpConn.setRequestProperty(key, headerMap.get(key));
            }
        }
        return httpConn;
    }
    
    /**
     * 从输入流中获取结果信息.
     * 
     * @param is
     * @return
     * @throws IOException
     */
    private static String getResultFromStream(InputStream is){
    
    
        String result = "";
        BufferedReader in = null;
        
        try{
    
    
            // 定义BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(is,"utf-8"));//防止乱码
            String line;
            while ((line = in.readLine()) != null) {
    
    
                result += line;
            }
        } catch (Exception e) {
    
    
            logger.error("从输入流中获取结果信息出现异常！", e);
        }
        
        // 使用finally块来关闭输出流
        finally{
    
    
            try{
    
    
                if(in != null){
    
    
                    in.close();
                }
            }
            catch(Exception ex){
    
    
                logger.error("关闭输入流出现异常！", ex);
            }
        }
        
        return result;
    }
    
    /**
     * 向输出流中添加参数内容.
     * 
     * @param os
     * @param param
     * @throws IOException
     */
    private static void setParamToStream(OutputStream os, String param){
    
    
        OutputStreamWriter out = null;
        try {
    
    
            // 获取URLConnection对象对应的输出流
            out = new OutputStreamWriter(os, "UTF-8");
            // 发送请求参数
            out.write(param);
            // flush输出流的缓冲
            out.flush();
        } catch (Exception e) {
    
    
            logger.error(param + "向输出流中添加参数内容出现异常！", e);
        }
        
        // 使用finally块来关闭输出流
        finally{
    
    
            try{
    
    
                if(out != null){
    
    
                    out.close();
                }
            }
            catch(Exception ex){
    
    
                logger.error(param + "关闭输出流出现异常！", ex);
            }
        }
    }
    
    /**
     * 把数组所有元素排序，并按照“参数=参数值”的模式用“&”字符拼接成字符串
     * 
     * @param params
     *            需要排序并参与字符拼接的参数组
     * @return 拼接后字符串
     */
    private static String createLinkString(Map<String, String> params) {
    
    
        List<String> keys = new ArrayList<String>(params.keySet());
        Collections.sort(keys);

        StringBuffer prestr = new StringBuffer();
        for (int i = 0; i < keys.size(); i++) {
    
    
            String key = keys.get(i);
            String value = params.get(key);

            if (i == keys.size() - 1) {
    
    // 拼接时，不包括最后一个&字符
                prestr.append(key).append("=").append(value);
            } else {
    
    
                prestr.append(key).append("=").append(value).append("&");
            }
        }
        return prestr.toString();
    }
}