Java利用httpclient通过get、post方式调用https接口的方法
通过httpclient的getpost方式调用http很常见。一般都是
HttpClientclient=newDefaultHttpClient(); HttpPostpost=newHttpPost(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
org.apache.httpcomponents httpclient 4.5.5 com.alibaba fastjson 1.2.47
先导入包
然后重写DefaultHttpClient的类
importjava.security.cert.CertificateException;
importjava.security.cert.X509Certificate;
importjavax.net.ssl.SSLContext;
importjavax.net.ssl.TrustManager;
importjavax.net.ssl.X509TrustManager;
importorg.apache.http.conn.ClientConnectionManager;
importorg.apache.http.conn.scheme.Scheme;
importorg.apache.http.conn.scheme.SchemeRegistry;
importorg.apache.http.conn.ssl.SSLSocketFactory;
importorg.apache.http.impl.client.DefaultHttpClient;
publicclassSSLClientextendsDefaultHttpClient{
publicSSLClient()throwsException{
super();
SSLContextctx=SSLContext.getInstance("TLS");
X509TrustManagertm=newX509TrustManager(){
@Override
publicvoidcheckClientTrusted(X509Certificate[]chain,
StringauthType)throwsCertificateException{
}
@Override
publicvoidcheckServerTrusted(X509Certificate[]chain,
StringauthType)throwsCertificateException{
}
@Override
publicX509Certificate[]getAcceptedIssuers(){
returnnull;
}
};
ctx.init(null,newTrustManager[]{tm},null);
SSLSocketFactoryssf=newSSLSocketFactory(ctx,SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
ClientConnectionManagerccm=this.getConnectionManager();
SchemeRegistrysr=ccm.getSchemeRegistry();
sr.register(newScheme("https",443,ssf));
}
}
这时候就可以使用https方式调用了
importorg.apache.http.HttpEntity;
importorg.apache.http.HttpResponse;
importorg.apache.http.StatusLine;
importorg.apache.http.client.HttpClient;
importorg.apache.http.client.methods.HttpGet;
importorg.apache.http.client.methods.HttpPost;
importorg.apache.http.entity.StringEntity;
importorg.apache.http.message.BasicHeader;
importorg.apache.http.util.EntityUtils;
publicclassHttpClientUtil{
publicstaticStringdoGet(Stringurl,Stringcharset)throwsException{
HttpClienthttpClient=null;
HttpGetHttpget=null;
Stringresult=null;
httpClient=newSSLClient();
Httpget=newHttpGet(url);
Httpget.addHeader("Content-Type","application/json");
HttpGet.setEntity(se);
HttpResponseresponse=httpClient.execute(Httpget);
if(response!=null){
HttpEntityresEntity=response.getEntity();
if(resEntity!=null){
result=EntityUtils.toString(resEntity,charset);
}
}
returnresult;
}
publicstaticStringdoPost(Stringurl,Stringjson,Stringcharset)throwsException{
HttpClienthttpClient=null;
HttpPostHttpPost=null;
Stringresult=null;
httpClient=newSSLClient();
HttpPost=newHttpPost(url);
HttpPost.addHeader("Content-Type","application/json");
StringEntityse=newStringEntity(json);
se.setContentType("text/json");
se.setContentEncoding(newBasicHeader("Content-Type","application/json"));
HttpPost.setEntity(se);
HttpResponseresponse=httpClient.execute(HttpPost);
if(response!=null){
HttpEntityresEntity=response.getEntity();
if(resEntity!=null){
result=EntityUtils.toString(resEntity,charset);
}
}
returnresult;
}
}
post调用代码
publicstaticvoidmain(String[]args)throwsException{
Stringurl="https://127.0.0.1/getuser";
Stringjson="{\"id\":1}";
Stringstr=HttpClientUtil.doPost(url,json,"utf-8");
System.out.println(str);
}
get调用代码
publicstaticvoidmain(String[]args)throwsException{
Stringurl="https://127.0.0.1/getuser?id=1";
Stringstr=HttpClientUtil.doPost(url,"utf-8");
System.out.println(str);
}
StringEntity参数说明
se.setContentEncoding(newBasicHeader(“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：AtomXML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-www-form-urlencoded：中默认的encType，form表单数据被编码为key/value格式发送到服务器（表单默认的提交数据的格式）
HttpPost.addHeader("Content-Type","application/x-www-form-urlencoded");
Listparams=newArrayList<>();
params.add(newBasicNameValuePair("key1","value1"));
params.add(newBasicNameValuePair("key2","value2"));
params.add(newBasicNameValuePair("key3","value3"));
UrlEncodedFormEntityentity=newUrlEncodedFormEntity(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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