文章目录
1. 使用 URIBuilder来构建请求URI2. 使用 NameValuePair 来拼接URI3. 根据 HttpGet反向获取键值对列表使用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：
<dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpcore</artifactId><version>4.4.3</version></dependency><dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.5.1</version></dependency>
import mon.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<String, String> para)throws URISyntaxException {URIBuilder builder = new URIBuilder(url);Set<String> 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<NameValuePair> 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("/?var=1&var=2");URIBuilder newBuilder = new URIBuilder(request.getURI());//获取键值对列表List<NameValuePair> params = newBuilder.getQueryParams();//转换为键值对字符串String str = EntityUtils.toString(new UrlEncodedFormEntity(params, Consts.UTF_8));
