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

<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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原文链接：https://blog.csdn.net/terry711/article/details/112471780