一、获取jar
实现任何功能肯定是先获取相应工具类，即jar包。可以使用复制的方式或者maven获取。项目中已导入jar，可以直接使用。
需要的jar入图：
项目地址：svn://www.kittybunny.cn/kitty/2%E3%80%81code/httpdemo 用户名密码：reader/reader
maven地址：
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| <dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.2</version>
</dependency>
<!--fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.32</version>
</dependency>
|
二、编写工具类
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| package club.kittybunny.httpclient;
import java.util.HashMap;
import java.util.Map;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import com.alibaba.fastjson.JSON;
/**
* 除了使用项目提供的jar也可以使用maven下载，参考地址如下
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5.2</version>
</dependency>
<!--fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.32</version>
</dependency>
* @author bunny～～我是兔子我会喵，我叫喵星兔。
*
*/
public class HttpUtil {
/** 请求编码 */
private static final String DEFAULT_CHARSET = "UTF-8";
/**
* 执行HTTP POST请求
*
* @param url
* url
* @param param
* 参数
* @return
*/
public static String httpPostWithJSON(String url, Map<String, ?> param) {
CloseableHttpClient client = null;
try {
if (url == null || url.trim().length() == 0) {
throw new Exception("URL is null");
}
HttpPost httpPost = new HttpPost(url);
client = HttpClients.createDefault();
if (param != null) {
StringEntity entity = new StringEntity(JSON.toJSONString(param), DEFAULT_CHARSET);// 解决中文乱码问题
entity.setContentEncoding(DEFAULT_CHARSET);
entity.setContentType("application/json");
httpPost.setEntity(entity);
}
HttpResponse resp = client.execute(httpPost);
if (resp.getStatusLine().getStatusCode() == 200) {
return EntityUtils.toString(resp.getEntity(), DEFAULT_CHARSET);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
close(client);
}
return null;
}
/**
* 执行HTTP GET请求
*
* @param url
* url
* @param param
* 参数
* @return
*/
public static String httpGetWithJSON(String url, Map<String, ?> param) {
CloseableHttpClient client = null;
try {
if (url == null || url.trim().length() == 0) {
throw new Exception("URL is null");
}
client = HttpClients.createDefault();
if (param != null) {
StringBuffer sb = new StringBuffer("?");
for (String key : param.keySet()) {
sb.append(key).append("=").append(param.get(key)).append("&");
}
url = url.concat(sb.toString());
url = url.substring(0, url.length() - 1);
}
HttpGet httpGet = new HttpGet(url);
HttpResponse resp = client.execute(httpGet);
if (resp.getStatusLine().getStatusCode() == 200) {
return EntityUtils.toString(resp.getEntity(), DEFAULT_CHARSET);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
close(client);
}
return null;
}
/**
* 关闭HTTP请求
*
* @param client
*/
private static void close(CloseableHttpClient client) {
if (client == null) {
return;
}
try {
client.close();
} catch (Exception e) {
}
}
}
|
三、编写测试类
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| public static void main(String[] args) {
Map<String, String> param = new HashMap<>();
param.put("name", "hehe");
String result = httpGetWithJSON("http://127.0.0.1:9999/hello", param);
System.out.println("result:" + result);
}
|
执行结果如下：
