搞了半天的工具类，已测试，可直接使用
1.pom文件
<dependencies>
<!-- httpclient -->
<!-- https://mvnrepository.com/artifact/commons-httpclient/commons-httpclient -->
<dependency>
<groupId>commons-httpclient</groupId>
<artifactId>commons-httpclient</artifactId>
<version>3.0.1</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.2</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient-cache</artifactId>
<version>4.5</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpmime</artifactId>
<version>4.3.2</version>
</dependency>2.工具类，四种方法及传参返回值
package com.wind.okhttp;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.DeleteMethod;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
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.client.methods.HttpPut;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;
import org.apache.log4j.Logger;
/**
* @author hhb
* @date
* HttpClient工具类
*/
public class httpClientUtils {
private static Logger logger = Logger.getLogger(httpClientUtils.class);
/**
* get请求
* @return
* @throws Exception
*/
public static String doGet(String url,Map<String,String> map) throws Exception {
url+="?";
//拼装参数
Set<Entry<String, String>> entrySet = map.entrySet();
for (Entry<String, String> entry : entrySet) {
url += entry.getKey() + "=" + URLEncoder.encode(entry.getValue(), "utf-8") + "&";
}
// 1.使用默认的配置的httpclient
CloseableHttpClient client = HttpClients.createDefault();
// 2.使用get方法
HttpGet httpGet = new HttpGet(url);
httpGet.setHeader("Content-type", "application/json");
CloseableHttpResponse response = null;
try
{
// 3.执行请求，获取响应
response = client.execute(httpGet);
// 看请求是否成功，这儿打印的是http状态码
System.out.println(response.getStatusLine().getStatusCode());
// 4.获取响应的实体内容，就是我们所要抓取得网页内容
HttpEntity entity = response.getEntity();
// 5.将其打印到控制台上面
// 方法一：使用EntityUtils
if (entity != null)
{
String json_String = EntityUtils.toString(entity, "utf-8");
return json_String;
}
EntityUtils.consume(entity);
}
catch (Exception e)
{
e.printStackTrace();
}
return null;
}
/**
* post请求(用于key-value格式的参数)
* @param url
* @param params
* @return
*/
public static String doPost(String url, Map params){
BufferedReader in = null;
try {
// 定义HttpClient
CloseableHttpClient client = HttpClients.createDefault();
// 实例化HTTP方法
HttpPost request = new HttpPost();
request.setURI(new URI(url));
request.setHeader("Content-type", "application/json");
//设置参数
List<NameValuePair> nvps = new ArrayList<NameValuePair>();
for (Iterator iter = params.keySet().iterator(); iter.hasNext();) {
String name = (String) iter.next();
String value = String.valueOf(params.get(name));
nvps.add(new BasicNameValuePair(name, value));
//System.out.println(name +"-"+value);
}
request.setEntity(new UrlEncodedFormEntity(nvps,HTTP.UTF_8));
HttpResponse response = client.execute(request);
int code = response.getStatusLine().getStatusCode();
if(code == 200){ //请求成功
in = new BufferedReader(new InputStreamReader(response.getEntity()
.getContent(),"utf-8"));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
in.close();
return sb.toString();
}
else{ //
System.out.println("状态码：" + code);
return null;
}
}
catch(Exception e){
e.printStackTrace();
return null;
}
}
/**
* put map传参
* @param url
* @param params
* @return
*/
public static String doput(String url,Map params){
BufferedReader in = null;
try {
// 定义HttpClient
CloseableHttpClient client = HttpClients.createDefault();
// 实例化HTTP方法
HttpPut request = new HttpPut();
request.setURI(new URI(url));
request.setHeader("Content-type", "application/json");
//设置参数
List<NameValuePair> nvps = new ArrayList<NameValuePair>();
for (Iterator iter = params.keySet().iterator(); iter.hasNext();) {
String name = (String) iter.next();
String value = String.valueOf(params.get(name));
nvps.add(new BasicNameValuePair(name, value));
//System.out.println(name +"-"+value);
}
request.setEntity(new UrlEncodedFormEntity(nvps,HTTP.UTF_8));
HttpResponse response = client.execute(request);
int code = response.getStatusLine().getStatusCode();
if(code == 200){ //请求成功
in = new BufferedReader(new InputStreamReader(response.getEntity()
.getContent(),"utf-8"));
StringBuffer sb = new StringBuffer("");
String line = "";
String NL = System.getProperty("line.separator");
while ((line = in.readLine()) != null) {
sb.append(line + NL);
}
in.close();
return sb.toString();
}
else{ //
System.out.println("状态码：" + code);
return null;
}
}
catch(Exception e){
e.printStackTrace();
return null;
}
}
/**
* 删除
* @param url
* @param dataForm
* @return
*/
public static String DELETE(String url,Map<String,String> dataForm){
HttpClient httpClient = new HttpClient();
DeleteMethod deleteMethod = new DeleteMethod(url);
List<org.apache.commons.httpclient.NameValuePair> data = new ArrayList<org.apache.commons.httpclient.NameValuePair>();
if(dataForm!=null){
Set<String> keys = dataForm.keySet();
for(String key:keys){
org.apache.commons.httpclient.NameValuePair nameValuePair = new org.apache.commons.httpclient.NameValuePair(key, (String) dataForm.get(key));
data.add(nameValuePair);
}
}
deleteMethod.setQueryString(data.toArray(new org.apache.commons.httpclient.NameValuePair[0]));
try {
int statusCode = httpClient.executeMethod(deleteMethod);
if (statusCode != HttpStatus.SC_OK) {
return "Method failed: " + deleteMethod.getStatusLine();
}
// Read the response body.
byte[] responseBody = deleteMethod.getResponseBody();
// Deal with the response.
// Use caution: ensure correct character encoding and is not binary data
return new String(responseBody);
} catch (IOException e) {
e.printStackTrace();
}finally {
deleteMethod.releaseConnection();
}
return null;
}
public static void main(String[] args) throws Exception {
//测试put传参方法 (map)
Map<String,String> map=new HashMap<>();
map.put("aaa", "111");
map.put("ccc", "111");
map.put("sss", "111");
map.put("fff", "111");
String get = doGet("http://localhost:8080/get", map);
System.out.println("测试get map 2 "+get);
String post = doPost("http://localhost:8080/post", map);
System.out.println("测试post map 2 "+post);
String mapS = doput("http://localhost:8080/put", map);
System.out.println("测试put map 2 "+mapS);
//delete测试
String delete = DELETE("http://localhost:8080/delete", map);
System.out.println("测试delete map 2 "+delete);
}
}