httpClient是javaEE语言中用于接口调用的框架，本案例封装好了httpClientUtils工具类，用于发送GET和POST请求，直接将此工具类复制到你的项目中就可以了。
第一步：httpClient jar包可采用maven方式下载，version版本自己改，如下；
javax.servlet.jsp
jsp-api
2.2
commons-httpclient
commons-httpclient
3.1
第二步：新建httpClientUtils.java工具类，将此内容复制到你的项目中。package cn.com.baidu.util;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHeaders;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
public class HttpClientUtils {
public static String getContentFromUrl(String url) {
CloseableHttpClient httpClient = HttpClients.createDefault();
try {
HttpGet request = new HttpGet(url);
request.setHeader(HttpHeaders.USER_AGENT,
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36");
request.setHeader(HttpHeaders.ACCEPT, "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
request.setHeader(HttpHeaders.ACCEPT_ENCODING, "gzip, deflate, sdch");
request.setHeader(HttpHeaders.CONNECTION, "keep-alive");
CloseableHttpResponse httpResponse = null;
httpResponse = httpClient.execute(request);
try {
HttpEntity entity = httpResponse.getEntity();
if (null != entity) {
return EntityUtils.toString(entity);
}
} finally {
httpResponse.close();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (httpClient != null) {
httpClient.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
public static InputStream getStreamFromUrl(String url) {
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpGet request = new HttpGet(url);
request.setHeader(HttpHeaders.USER_AGENT,
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36");
request.setHeader(HttpHeaders.ACCEPT,
"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
request.setHeader(HttpHeaders.ACCEPT_ENCODING, "gzip, deflate, sdch");
request.setHeader(HttpHeaders.CONNECTION, "keep-alive");
CloseableHttpResponse httpResponse = null;
try {
httpResponse = httpClient.execute(request);
HttpEntity entity = httpResponse.getEntity();
if (null != entity) {
return entity.getContent();
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public static String doPost(String url,Map map,String charset){
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(url);;
String result = null;
try{
//设置参数
List list = new ArrayList();
//遍历map集合
for(Map.Entry entry :map.entrySet()){
list.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
}
if(list.size() > 0){
//charset=utf-8或者gbk2312
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,charset);
httpPost.setEntity(entity);
}
HttpResponse response = httpClient.execute(httpPost);
if(response != null){
HttpEntity resEntity = response.getEntity();
if(resEntity != null){
result = EntityUtils.toString(resEntity,charset);
}
}
}catch(Exception ex){
ex.printStackTrace();
}finally {
if (httpClient != null) {
try {
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return result;
}
}
第三步：使用httpClientUtils工具类发送get，post请求案例。public class TestMain {
//发送get请求,拼接参数
public void testPost(){
String url = "https://192.168.1.101/login?username=xxx&password=xxxx";
String result = httpClientUtils.getContentFromUrl(url);
System.out.println("get登录结果:"+result);
}
//发送post请求,form表单参数
public void testPost(){
String url = "http://192.168.1.101/login";
String charset = "utf-8";
Map loginMap = new HashMap();
loginMap.put("username","*****");
loginMap.put("password","*****");
String result = httpClientUtils.doPost(url,loginMap,charset);
System.out.println("post登录结果:"+result);
}
public static void main(String[] args){
testPost();
testPost();
}
}
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