http（post）接口调用工具类

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;

public class HttpSessionUtils {

    public static String readString(InputStream input) throws IOException {

        StringBuilder result = new StringBuilder();

        InputStreamReader reader = new InputStreamReader(input, "utf-8");
        char[] buffer = new char[1024];
        int len = 0;
        while ((len = reader.read(buffer)) != -1) {
            result.append(buffer, 0, len);
        }
        return result.toString();
    }

    public static String sendRequest(String url, Map<String, String> params) {

        HttpClient httpclient = new DefaultHttpClient();
        String resturl = url;
        HttpPost httpPost = new HttpPost(resturl);
        List<NameValuePair> postParams = new ArrayList<NameValuePair>();
        StringBuilder result = new StringBuilder();
        for (String key : params.keySet()) {
            postParams.add(new BasicNameValuePair(key, params.get(key)));
        }
        try {
            httpPost.setEntity(new UrlEncodedFormEntity(postParams, "utf-8"));
            HttpResponse response = httpclient.execute(httpPost);
            java.io.InputStream input = response.getEntity().getContent();
            result.append(readString(input));
            input.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result.toString();
    }
}