通過httpclient的get post方式調用http很常見。一般都是

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

但是如果要調用https這個方式就不行了。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>先導入包

然后重寫DefaultHttpClient的類

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)); }}

這時候就可以使用https方式調用了

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調用代碼

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調用代碼

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參數說明se.setContentEncoding(new BasicHeader(“Content-Type”, “application/json”));使用的是json模式 所以傳的格式是json

application/xhtml+xml ：XHTML格式application/xml ： XML數據格式application/atom+xml ：Atom XML聚合格式application/json ： JSON數據格式application/pdf ：pdf格式application/msword ： Word文檔格式application/octet-stream ： 二進制流數據（如常見的文件下載）application/x-www-form-urlencoded ： 中默認的encType，form表單數據被編碼為key/value格式發送到服務器（表單默認的提交數據的格式）

HttpPost.addHeader('Content-Type', ' application/x-www-form-urlencoded');List<NameValuePair> params=new ArrayList<>();params.add(new BasicNameValuePair('key1','value1'));params.add(new BasicNameValuePair('key2','value2'));params.add(new BasicNameValuePair('key3','value3'));UrlEncodedFormEntity entity=new UrlEncodedFormEntity(params,'UTF-8');HttpPost.setEntity(entity);

如果要采用表單提交方式就需要修改成上面所描述的方式。

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