httpclient post 表单参数请求

 httpclient post带参数请求的步骤：

1、声明NameValuePair列表对象，把相关的参数添加到此列表中

 List<NameValuePair> parameters = new ArrayList<NameValuePair>(0);

2、初始化BasicNameValuePair对象，就是参数

 parameters.add(new BasicNameValuePair("scope", "project"));

 parameters.add(new BasicNameValuePair("q", "java"));

3、构造一个form表单式的实体UrlEncodedFormEntity，并把List<NameValuePair>参数列表添加到该表单中

UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters);

4、将请求实体设置到httpPost对象中

httpPost.setEntity(formEntity);

示例：

package com._656463.httpclient;
  
import java.util.ArrayList;
import java.util.List;
  
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
  
public class DoPOSTParam {
    public static void main(String[] args) throws Exception {
        // 创建Httpclient对象
        CloseableHttpClient httpclient = HttpClients.createDefault();
  
        // 创建http POST请求
        HttpPost httpPost = new HttpPost("http://www.oschina.net/search");
  
        // 设置2个post参数，一个是scope、一个是q
        List<NameValuePair> parameters = new ArrayList<NameValuePair>(0);
        parameters.add(new BasicNameValuePair("scope", "project"));
        parameters.add(new BasicNameValuePair("q", "java"));
        // 构造一个form表单式的实体
        UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(parameters);
        // 将请求实体设置到httpPost对象中
        httpPost.setEntity(formEntity);
  
        httpPost.setHeader(
                "User-Agent",
                "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.118 Safari/537.36");
  
        CloseableHttpResponse response = null;
        try {
            // 执行请求
            response = httpclient.execute(httpPost);
            // 判断返回状态是否为200
            if (response.getStatusLine().getStatusCode() == 200) {
                String content = EntityUtils.toString(response.getEntity(),
                        "UTF-8");
                System.out.println(content);
            }
        } finally {
            if (response != null) {
                response.close();
            }
            httpclient.close();
        }
    }
}

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