通过httpclient的get post方式调用http很常见。一般都是

HttpClient client = new DefaultHttpClient(); HttpPost post = new HttpPost(http://127.0.0.1/login);

但是如果要调用https这个方式就不行了。就要修改DefaultHttpClient

<dependency> <groupId>org.apache.httpcomponents</groupId> <artifactId>httpclient</artifactId> <version>4.5.5</version></dependency><dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.47</version></dependency>

先导入包

然后重写DefaultHttpClient的类

import java.security.cert.CertificateException;import java.security.cert.X509Certificate;import javax.net.ssl.SSLContext;import javax.net.ssl.TrustManager;import javax.net.ssl.X509TrustManager;import org.apache.http.conn.ClientConnectionManager;import org.apache.http.conn.scheme.Scheme;import org.apache.http.conn.scheme.SchemeRegistry;import org.apache.http.conn.ssl.SSLSocketFactory;import org.apache.http.impl.client.DefaultHttpClient;public class SSLClient extends DefaultHttpClient { public SSLClient() throws Exception{ super(); SSLContext ctx = SSLContext.getInstance("TLS"); X509TrustManager tm = new X509TrustManager() { @Override public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException { } @Override public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException { } @Override public X509Certificate[] getAcceptedIssuers() { return null; } }; ctx.init(null, new TrustManager[]{tm}, null); SSLSocketFactory ssf = new SSLSocketFactory(ctx,SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER); ClientConnectionManager ccm = this.getConnectionManager(); SchemeRegistry sr = ccm.getSchemeRegistry(); sr.register(new Scheme("https", 443, ssf)); }}

这时候就可以使用https方式调用了

import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.StatusLine;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.StringEntity;import org.apache.http.message.BasicHeader;import org.apache.http.util.EntityUtils;public class HttpClientUtil { public static String doGet(String url,String charset) throws Exception{ HttpClient httpClient = null; HttpGet Httpget = null; String result = null; httpClient = new SSLClient(); Httpget = new HttpGet(url); Httpget.addHeader("Content-Type", "application/json"); HttpGet.setEntity(se); HttpResponse response = httpClient.execute(Httpget); if(response != null){ HttpEntity resEntity = response.getEntity(); if(resEntity != null){ result = EntityUtils.toString(resEntity,charset); } } return result; } public static String doPost(String url,String json,String charset) throws Exception{ HttpClient httpClient = null; HttpPost HttpPost = null; String result = null; httpClient = new SSLClient(); HttpPost = new HttpPost(url); HttpPost.addHeader("Content-Type", "application/json"); StringEntity se = new StringEntity(json); se.setContentType("text/json"); se.setContentEncoding(new BasicHeader("Content-Type", "application/json")); HttpPost.setEntity(se); HttpResponse response = httpClient.execute(HttpPost); if(response != null){ HttpEntity resEntity = response.getEntity(); if(resEntity != null){ result = EntityUtils.toString(resEntity,charset); } } return result; } }

post调用代码

public static void main(String[] args) throws Exception{ String url = "https://127.0.0.1/getuser"; String json = "{\"id\":1}"; String str = HttpClientUtil.doPost(url, json, "utf-8"); System.out.println(str); }

get调用代码

public static void main(String[] args) throws Exception{ String url = "https://127.0.0.1/getuser?id=1"; String str = HttpClientUtil.doPost(url, "utf-8"); System.out.println(str); }

StringEntity参数说明
se.setContentEncoding(new BasicHeader(“Content-Type”, “application/json”));
使用的是json模式 所以传的格式是json

application/xhtml+xml ：XHTML格式
application/xml ： XML数据格式
application/atom+xml ：Atom XML聚合格式
application/json ： JSON数据格式
application/pdf ：pdf格式
application/msword ： Word文档格式
application/octet-stream ： 二进制流数据（如常见的文件下载）
application/x-ameValuePair("key3","value3"));UrlEncodedFormEntity entity=new UrlEncodedFormEntity(params,"UTF-8");HttpPost.setEntity(entity);

如果要采用表单提交方式就需要修改成上面所描述的方式。

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