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向指定url发送Get/Post请求
1、向指定url发送Get/Post请求
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;
public class HTTPRequest {
/**
* 向指定URL发送GET方法的请求
*
* @param url
* 发送请求的URL
* @param param
* 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
* @return URL 所代表远程资源的响应结果
*/
public static String sendGet(String url, String param) {
String result = "";
BufferedReader in = null;
try {
String urlNameString = url + "?" + param;
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) {
System.out.println("发送GET请求出现异常！" + 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;
}
/**
* 向指定 URL 发送POST方法的请求
*
* @param url
* 发送请求的 URL
* @param param
* 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
* @return 所代表远程资源的响应结果
*/
public static String sendPost(String url, String param) throws Exception{
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(new OutputStreamWriter(conn.getOutputStream(), "utf-8"));
// 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(), "utf-8"));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常！"+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;
}
}
2、HttpUtil
import java.io.IOException
import java.util
import org.apache.http.client.ClientProtocolException
import org.apache.http.client.entity.UrlEncodedFormEntity
import org.apache.http.client.methods.{HttpGet, HttpPost}
import org.apache.http.impl.client.{DefaultHttpClient, HttpClients}
import org.apache.http.message.BasicNameValuePair
import org.apache.http.util.EntityUtils
import org.slf4j.LoggerFactory
import scala.collection.JavaConversions._
import scala.reflect.macros.ParseException
object HttpClientUtils {
val logger = LoggerFactory.getLogger("out")
def get(url: String): String = {
val httpclient = new DefaultHttpClient()
try {
// 创建httpget.
val httpget = new HttpGet(url)
// 执行get请求.
val response = httpclient.execute(httpget)
try {
// 获取响应实体
val entity = response.getEntity()
EntityUtils.toString(entity, "utf-8")
} finally {
response.close()
}
} catch {
case ex: ClientProtocolException => {logger.error(ex.getMessage);null}
case ex: ParseException => {logger.error(ex.getMessage);null}
case ex: IOException => {logger.error(ex.getMessage);null}
} finally {
// 关闭连接,释放资源
httpclient.close()
}
}
def post(url: String, map: Map[String,String]): String = {
//创建httpclient对象
val client = HttpClients.createDefault
try {
//创建post方式请求对象
val httpPost = new HttpPost(url)
//装填参数
val nvps:util.ArrayList[BasicNameValuePair] = new util.ArrayList[BasicNameValuePair]
if (map != null) {
for (entry <- map.entrySet) {
nvps.add(new BasicNameValuePair(entry.getKey, entry.getValue))
}
}
//设置参数到请求对象中
httpPost.setEntity(new UrlEncodedFormEntity(nvps, "UTF-8"))
//执行请求操作，并拿到结果（同步阻塞）
val response = client.execute(httpPost)
//获取结果实体
val entity = response.getEntity
var body = ""
if (entity != null) { //按指定编码转换结果实体为String类型
body = EntityUtils.toString(entity, "UTF-8")
}
//释放链接
response.close()
body
} finally {
client.close()
}
}
}