这篇文章给大家介绍Java中怎么发送HTTP请求,内容非常详细,感兴趣的小伙伴们可以参考借鉴,希望对大家能有所帮助。
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;
}
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