详解Java发送HTTP请求
前言请求http的demo是个人亲测过，目前该方式已经在线上运行着。因为是http请求，所有发送post 和get 请求的demo都有在下方贴出，包括怎么测试，大家可直接 copy到自己的项目中使用。
正文
使用须知
为了避免大家引错包我把依赖和涉及到包路径给大家
import java.net.httpurlconnection;
import java.net.uri;
import org.apache.http.httpresponse;
import org.apache.http.httpstatus;
import org.apache.http.client.methods.httpget;
import org.apache.http.client.methods.httppost;
import org.apache.http.client.utils.uribuilder;
import org.apache.http.entity.stringentity;
import org.apache.http.impl.client.closeablehttpclient;
import org.apache.http.impl.client.defaulthttpclient;
import org.apache.http.impl.client.httpclients;
import org.apache.http.util.entityutils;
import com.fasterxml.jackson.databind.objectmapper;
<dependency>
<groupid>org.apache.httpcomponents</groupid>
<artifactid>httpcore</artifactid>
<version>4.4.8</version>
</dependency>
<dependency>
<groupid>org.apache.httpcomponents</groupid>
<artifactid>httpclient</artifactid>
<version>4.5.3</version>
</dependency>
http 发送 get 请求
首先我们引入两个包
发送get请求的工具类，可直接 copy 使用即可
另外，我抛出异常的代码大家改成自己业务的异常，不需要就删除掉。
参数说明：
host：ip
servuri：url
restring：参数
public static string gethttpdata(string host, string servuri, string restring) throws exception {
stringbuffer sb = new stringbuffer();
sb.append("gethttpdata:host:" + host + ",servuri:" + servuri + ",restring:" + restring);
string strresp = null;
try {
uri uri = new uribuilder().setscheme("http").sethost(host).setpath(servuri)
.setparameter("strinfo", restring).build();
httpget httpget = new httpget(uri);
closeablehttpclient client3 = httpclients.createdefault();
httpresponse resp;
resp = client3.execute(httpget);
if (resp.getstatusline().getstatuscode() == httpurlconnection.http_ok) {
strresp = entityutils.tostring(resp.getentity());
logger.info("the return result:{}", strresp);
} else {
logger.info("error response:", resp.getstatusline().tostring());
throw new commonbusinessexception(commonconstants.task_release_wcf,
commonconstants.task_release_wcf_desc);
}
} catch (exception e) {
logger.error(sb.tostring() + ":" + e.getmessage(), e.getcause());
throw new commonbusinessexception(commonconstants.task_release_wcf, commonconstants.task_release_wcf_desc);
}
return strresp;
}
http 发送 post 请求
发送post分两种,我分两种的原因是为了让大家方便，想传对象和 json 可以直接复制过用就可以用，不用你们在转了。
第一种是直接接收json
参数明说：
url：url
json：参数
public static string dopostdata(string url, string json) throws exception {
defaulthttpclient client = new defaulthttpclient();
httppost post = new httppost(url);
string result = "";
httpresponse res = null;
try {
stringentity s = new stringentity(json.tostring(), "utf-8");
s.setcontenttype("application/json");
post.setheader("accept", "application/json");
post.setheader("content-type", "application/json; charset=utf-8");
post.setentity(s);
res = client.execute(post);
if (res.getstatusline().getstatuscode() == httpstatus.sc_ok) {
result = entityutils.tostring(res.getentity());
return httpstatus.sc_ok + "";
}
} catch (exception e) {
if(res == null) {
return "httpresponse 为 null!";
}
throw new runtimeexception(e);
}
if(res == null || res.getstatusline() == null) {
return "无响应";
}
return res.getstatusline().getstatuscode() + "";
}
@test
public void test12() throws exception {
string host = "http://eipwcf.aspirecn.com/svcef/service1.svc/wcf_ef_msa_getdatainfo_p";
httpclient client = new httpclient();
jsonobject json = new jsonobject();
json.put("msgid", msgid);
string reslut=client.dopostdata(host, json);
}
第二种是参数是对象
参数说明：
url：url
tram：对象
public static string dohttppostdata(string url, taskreleaseapprovalmodel tram)
throws exception {
stringbuffer sb = new stringbuffer();
sb.append("dohttppostdata:url:" + url + ",tram:" + tram.tostring() + ",contenttype:" + contenttype);
logger.info(sb.tostring());
string tmpstring = "";
httppost request = new httppost(url);
request.setheader("accept", "application/json");
request.setheader("content-type", "application/json");
objectmapper mapper = new objectmapper();
string jsonstring;
try {
jsonstring = mapper.writevalueasstring(tram);
stringentity entity = new stringentity(jsonstring, "utf-8");
request.setentity(entity);
closeablehttpclient client = httpclients.createdefault();
httpresponse response = client.execute(request);
if (response.getstatusline().getstatuscode() == httpurlconnection.http_ok) {
tmpstring = entityutils.tostring(response.getentity());
logger.info("the post result:tmpstring:{}", tmpstring);
} else {
logger.info("the post failure:tmpstring:", tmpstring);
throw new commonbusinessexception(commonconstants.task_release_wcf,
commonconstants.task_release_wcf_desc);
}
} catch (exception e) {
logger.error(sb.tostring() + ":" + e.getmessage(), e.getcause());
throw new commonbusinessexception(commonconstants.task_release_postwcf,
commonconstants.task_release_postwcf_desc);
}
return tmpstring;
}
这个方法我想不用写测试类大家也会用，传过去对象和地址就可以了，很方便很简单。
以上所述是小编给大家介绍的java发送http请求详解整合，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对CodeAE代码之家网站的支持！
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