http请求工具
package com.util.http;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;
import net.sf.json.JSONObject;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
/**
* http请求工具
* @author lijx
* 2018-07-24
*/
public class HttpUtil {
public static final String httpClientPost(String url) {
String result = "";
HttpClient client = new HttpClient();
GetMethod getMethod = new GetMethod(url);
try {
client.executeMethod(getMethod);
result = getMethod.getResponseBodyAsString();
} catch (Exception e) {
e.printStackTrace();
} finally {
getMethod.releaseConnection();
}
return result;
}
public static final String httpClientPost(String url, List<NameValuePair> list)
{
String result = "";
HttpClient client = new HttpClient();
PostMethod postMethod = new PostMethod(url);
try {
NameValuePair[] params = new NameValuePair[list.size()];
for (int i = 0; i < list.size(); i++) {
params[i] = list.get(i);
}
postMethod.addParameters(params);
postMethod.addRequestHeader("", "");
client.executeMethod(postMethod);
result = postMethod.getResponseBodyAsString();
} catch (Exception e) {
e.printStackTrace();
} finally {
postMethod.releaseConnection();
}
return result;
}
@SuppressWarnings("deprecation")
public static final String httpClientPost(String url,JSONObject json) {
String result = "";
HttpClient client = new HttpClient();
PostMethod postMethod = new PostMethod(url);
try {
postMethod.setRequestHeader("Content-
Type","application/json;charset=UTF-8");
postMethod.setRequestBody(json.toString());
client.executeMethod(postMethod);
result = postMethod.getResponseBodyAsString();
} catch (Exception e) {
e.printStackTrace();
} finally {
postMethod.releaseConnection();
}
return result;
}
@SuppressWarnings("deprecation")
public static final String jsonPost(String url,String json) {
String result = "";
HttpClient client = new HttpClient();
PostMethod postMethod = new PostMethod(url);
try {
postMethod.setRequestHeader("Content-
Type","application/json;charset=UTF-8");
postMethod.setRequestBody(json);
client.executeMethod(postMethod);
result = postMethod.getResponseBodyAsString();
} catch (Exception e) {
e.printStackTrace();
} finally {
postMethod.releaseConnection();
}
return result;
}
public static String sendGet(String url) {
String result = "";
BufferedReader in = null;
try {
String urlNameString = url ;
URL realUrl = new URL(urlNameString);
// 打开和URL之间的连接
URLConnection connection = realUrl.openConnection();
// 设置通用的请求属性
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 建立实际的连接
connection.connect();
// 获取所有响应头字段
Map<String, List<String>> map = connection.getHeaderFields();
// 遍历所有的响应头字段
for (String key : map.keySet()) {
System.out.println(key + "--->" + map.get(key));
}
// 定义 BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(
connection.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
}
// 使用finally块来关闭输入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
return result;
}
/*public static String sendPut(String url,String data) {
String result = "";
BufferedReader in = null;
try {
CloseableHttpClient closeableHttpClient = HttpClients.createDefault();
HttpPut httpput = new HttpPut(url);
httpput.setHeader("username","111");
httpput.addHeader("password","111");
//组织请求参数
StringEntity stringEntity = new StringEntity(data, "UTF-8");
httpput.setEntity(stringEntity);
CloseableHttpResponse httpResponse = null;
try {
//响应信息
httpResponse = closeableHttpClient.execute(httpput);
HttpEntity entity = httpResponse.getEntity();
result = EntityUtils.toString(entity, "UTF-8");
} catch (Exception e) {
e.printStackTrace();
}
}
// 使用finally块来关闭输入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
return result;
}*/
public static String sendPost(String url, String param) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(param);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
e.printStackTrace();
}
//使用finally块来关闭输出流、输入流
finally{
try{
if(out!=null){
out.close();
}
if(in!=null){
in.close();
}
}catch(IOException ex){
ex.printStackTrace();
}
}
return result;
}
}
