工作中会遇到远程调用接口，需要编写Http请求的共通类
以下是自己总结的Http请求代码
package com.gomecar.index.common.utils; import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils; 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.nio.charset.Charset;
import java.util.*; public class HttpUtils { /**
* 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。
* @param timeout 连接超时时间 /单位毫秒
* @return URL 所代表远程资源的响应结果
*/
public static String sendGet(String url, String param,int timeout) {
StringBuffer resultBuf = new StringBuffer(); 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("Content-Type", "application/x-www-form-urlencoded");
connection.setConnectTimeout(timeout);
// 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(), Charset.forName("UTF-8")));
String line;
while ((line = in.readLine()) != null) {
resultBuf.append(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 resultBuf.toString();
} public static String assemParam(Map<String, Object> param) {
Set<String> keys = param.keySet();
StringBuffer sb = new StringBuffer();
for (Iterator<String> iter = keys.iterator(); iter.hasNext();) {
String key = iter.next();
sb.append(key);
sb.append("=");
sb.append(param.get(key));
if (iter.hasNext()) {
sb.append("&");
}
}
return sb.toString();
} /**
* 向指定 URL 发送POST方法的请求
*
* @param url
* 发送请求的 URL
* @param req
* 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
* @param timeout 连接超时时间 /单位毫秒
* @return 所代表远程资源的响应结果
*/
public static String sendPost(String url, Map req,int timeout) {
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)");
conn.setRequestProperty("content-type", "text/json");
conn.setRequestProperty("method","POST");
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setConnectTimeout(timeout);//连接超时时间
// 获取URLConnection对象对应的输出流
StringBuilder sb=new StringBuilder();
Iterator<String> iterator = req.keySet().iterator();
while (iterator.hasNext()) {
String key=iterator.next().toString();
String val=req.get(key).toString();
sb.append(key);
sb.append("=");
sb.append(val);
if (iterator.hasNext()) {
sb.append("&");
}
} out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(sb);
// 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(),Charset.forName("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+" url="+url+" param="+req+" time="+timeout);
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;
} /**
* 向指定 URL 发送POST方法的请求
*
* @param url 发送请求的 URL
* @param req 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 json) {
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)");
conn.setRequestProperty("content-type", "text/json");
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setConnectTimeout(5000);//连接超时时间
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(json);
// 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(), Charset.forName("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+" url="+url);
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;
} public static void main(String[] args) {
// http://10.144.48.82/mobile_api/serviceApi?method=product.ProductService.getGoodsInfo&skuNo=8001019816 String re = new HttpUtils().sendGet("http://10.144.48.82/serviceApi",
"method=product.getGoodsInfo&skuNo=8001019816",60);
// System.out.println(re);
} public String post(String url, String encoding, Map<String,String> map){
boolean checkFlag = false; HttpPost post = null;
DefaultHttpClient httpClient = new DefaultHttpClient();
try { //String url = "http://localhost:8081/batchCates";//Constant.PERMISSION_URL; post = new HttpPost(url);
List<BasicNameValuePair> postData = new ArrayList<BasicNameValuePair>();
for (Map.Entry<String, String> entry : map.entrySet()) {
postData.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
//LOG.info(entry.getValue());
}
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(postData,encoding);
post.setEntity(entity);
HttpResponse response = httpClient.execute(post);
//LOG.info(System.currentTimeMillis() - startTime);
HttpEntity resEntiy = response.getEntity();
String result = EntityUtils.toString(resEntiy);
return result; } catch (Exception e) {
e.printStackTrace();
} return ""; } }