java get请求参数拼接_HttpClient4.X发送Get请求的url参数拼接

HttpClient4.X发送Get请求的参数拼接

使用httpClient发送get请求时，请求参数可以以？key=val&key1=val1的拼接到url后面。

但是请求参数较多时，这种方法比较麻烦，也不太优雅；研究了一下发现HttpClient4.X本身

是支持处理参数的。

1. 使用 URIBuilder来构建请求URI

httpclient相关的jar包mvn依赖：

org.apache.httpcomponents

httpcore

4.4.3

org.apache.httpcomponents

httpclient

4.5.1

import com.google.common.collect.Lists;

import org.apache.http.Consts;

import org.apache.http.HttpEntity;

import org.apache.http.HttpStatus;

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.utils.URIBuilder;

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;

private HttpGet buildHttpGet(String url, Map para)

throws URISyntaxException {

URIBuilder builder = new URIBuilder(url);

Set set = para.keySet();

for(String key: set){

builder.setParameter(key, para.get(key));

}

HttpGet request = new HttpGet(builder.build());

RequestConfig requestConfig = RequestConfig.custom()

.setSocketTimeout(6000)

.setConnectTimeout(6000)

.setConnectionRequestTimeout(6000).build();

request.setConfig(requestConfig);

System.out.println(request.getURI().toString());

return request;

}

2. 使用 NameValuePair 来拼接URI

List params = Lists.newArrayList();

params.add(new BasicNameValuePair("cityEname", "henan"));

String str = "";

//转换为键值对

str = EntityUtils.toString(new UrlEncodedFormEntity(params, Consts.UTF_8));

System.out.println(str);

HttpGet httpGet = new HttpGet(url + "?" + str);

3. 根据 HttpGet反向获取键值对列表

HttpGet request = new HttpGet("http://example.com/?var=1&var=2");

URIBuilder newBuilder = new URIBuilder(request.getURI());

//获取键值对列表

List params = newBuilder.getQueryParams();

//转换为键值对字符串

String str = EntityUtils.toString(new UrlEncodedFormEntity(params, Consts.UTF_8));