Java利用httpclient通过get、post方式调用https接口的方法
作者：godliu711
这篇文章主要介绍了Java利用httpclient通过get、post方式调用https接口的方法,本文给大家介绍的非常详细，对大家的学习或工作具有一定的参考借鉴价值，需要的朋友可以参考下
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-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");
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);
如果要采用表单提交方式就需要修改成上面所描述的方式。
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