httpclient工具类

最新推荐文章于 2025-02-17 16:45:13 发布

albert1828

最新推荐文章于 2025-02-17 16:45:13 发布

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分类专栏： js前端 jfinal J2EE 文章标签： js跨域请求 httpclient

本文链接：https://blog.youkuaiyun.com/zhangyaping123/article/details/53009182

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本文介绍了一个实用的HTTP请求工具类，包括GET和POST请求的实现。该工具类使用Apache HttpClient进行HTTP通信，并展示了如何通过Java代码构造请求、处理响应等关键步骤。

引用自> https://my.oschina.net/u/873047/blog/204634
代码如下：
`
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

public class HttpRequestUtils {

private static final CloseableHttpClient httpClient;
public static final String CHARSET = "UTF-8";

static {
    RequestConfig config = RequestConfig.custom().setConnectTimeout(60000).setSocketTimeout(15000).build();
    httpClient = HttpClientBuilder.create().setDefaultRequestConfig(config).build();
}

public static String doGet(String url, Map<String, String> params){
    return doGet(url, params,CHARSET);
}
public static String doPost(String url, Map<String, String> params){
    return doPost(url, params,CHARSET);
}
/**
 * HTTP Get 获取内容
 * @param url  请求的url地址 ?之前的地址
 * @param params    请求的参数
 * @param charset   编码格式
 * @return  页面内容
 */
public static String doGet(String url,Map<String,String> params,String charset){
    if(url==null||"".equals(url)){
        return null;
    }
    try {
        if(params != null && !params.isEmpty()){
            List<NameValuePair> pairs = new ArrayList<NameValuePair>(params.size());
            for(Map.Entry<String,String> entry : params.entrySet()){
                String value = entry.getValue();
                if(value != null){
                    pairs.add(new BasicNameValuePair(entry.getKey(),value));
                }
            }
            url += "?" + EntityUtils.toString(new UrlEncodedFormEntity(pairs, charset));
        }
        HttpGet httpGet = new HttpGet(url);
        CloseableHttpResponse response = httpClient.execute(httpGet);
        int statusCode = response.getStatusLine().getStatusCode();
        if (statusCode != 200) {
            httpGet.abort();
            throw new RuntimeException("HttpClient,error status code :" + statusCode);
        }
        HttpEntity entity = response.getEntity();
        String result = null;
        if (entity != null){
            result = EntityUtils.toString(entity, "utf-8");
        }
        EntityUtils.consume(entity);
        response.close();
        return result;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

/**
 * HTTP Post 获取内容
 * @param url  请求的url地址 ?之前的地址
 * @param params    请求的参数
 * @param charset   编码格式
 * @return  页面内容
 */
public static String doPost(String url,Map<String,String> params,String charset){
    if(url==null||"".equals(url)){
        return null;
    }
    try {
        List<NameValuePair> pairs = null;
        if(params != null && !params.isEmpty()){
            pairs = new ArrayList<NameValuePair>(params.size());
            for(Map.Entry<String,String> entry : params.entrySet()){
                String value = entry.getValue();
                if(value != null){
                    pairs.add(new BasicNameValuePair(entry.getKey(),value));
                }
            }
        }
        HttpPost httpPost = new HttpPost(url);
        if(pairs != null && pairs.size() > 0){
            httpPost.setEntity(new UrlEncodedFormEntity(pairs,CHARSET));
        }
        CloseableHttpResponse response = httpClient.execute(httpPost);
        int statusCode = response.getStatusLine().getStatusCode();
        if (statusCode != 200) {
            httpPost.abort();
            throw new RuntimeException("HttpClient,error status code :" + statusCode);
        }
        HttpEntity entity = response.getEntity();
        String result = null;
        if (entity != null){
            result = EntityUtils.toString(entity, "utf-8");
        }
        EntityUtils.consume(entity);
        response.close();
        return result;
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}
public static void main(String []args){
    String getData = doGet("http://www.baidu.com/",null);
    System.out.println(getData);
    System.out.println("----------------------分割线-----------------------");
    String postData = doPost("http://www.baidu.com/",null);
    System.out.println(postData);
}

}

`
所需jar包：