Java利用httpclient通过get、post方式调用https接口的方法

Java利用httpclient通过get、post方式调用https接口的方法

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

org.apache.httpcomponents

httpclient

4.5.5

com.alibaba

fastjson

1.2.47

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_ALLfAOhhjnQ_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fAOhhjnQ式）

HttpPost.addHeader("Content-Type", " application/x-www-form-urlencoded");

List 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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