java设置头部的post请求接口

这是一个工具类,在此做记录可以直接拿去使用的

import java.net.SocketTimeoutException;
import java.nio.charset.Charset;
import java.util.Map;

import net.sf.json.JSONObject;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.util.EntityUtils;

//import com.alibaba.fastjson.JSONObject;

public class HttpPost2 {
	public static String getResult(String url,Map<String, Object> params){
        String returnValue = null;  //返回的数值
        HttpClient httpclient = new DefaultHttpClient();
        httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 15000);
        try {
             HttpPost httppost = new HttpPost(url);
             httppost.addHeader("Content-type","application/x-www-form-urlencoded; charset=utf-8");  
             httppost.setHeader("Accept", "application/json");
             
             StringEntity entity = new StringEntity(JSONObject.fromObject(params).toString());    
             httppost.setEntity(entity);
             
             HttpResponse resp = httpclient.execute(httppost);
             if(resp.getStatusLine().getStatusCode() == 200) {
                HttpEntity he = resp.getEntity();
                String   respContent = EntityUtils.toString(he,"UTF-8");
                returnValue =  respContent;
             }
        }
        catch (SocketTimeoutException e) {
             e.printStackTrace();
             returnValue = "timeout";
        }catch (Exception e) {
            e.printStackTrace();
        }finally {
           // 关闭连接,释放资源
            httpclient.getConnectionManager().shutdown();
       }
       return  returnValue;
    }

}