关于HTTP调用接口的四种方式（post,get,delete,put）

package Utils;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.DeleteMethod;

public class smsUtils {
//POST请求
public static String httpURLConnectionPOST (String parm,String Url) {
try {
URL url = new URL(Url);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 此时cnnection只是为一个连接对象,待连接中
connection.setDoOutput(true); // 设置连接输出流为true,默认false (post 请求是以流的方式隐式的传递参数)
connection.setDoInput(true); // 设置连接输入流为true
connection.setRequestMethod(“POST”); // 设置请求方式为post
connection.setUseCaches(false); // post请求缓存设为false
connection.setInstanceFollowRedirects(true); // 设置该HttpURLConnection实例是否自动执行重定向
connection.setRequestProperty(“Content-Type”, “application/x-www-form-urlencoded;charset=utf-8”);
connection.connect(); // 建立连接
// 创建输入输出流,用于往连接里面输出携带的参数,(输出内容为?后面的内容)
DataOutputStream dataout = new DataOutputStream(connection.getOutputStream());
dataout.writeBytes(parm);
// 输出完成后刷新并关闭流
dataout.flush();
dataout.close(); // 重要且易忽略步骤 (关闭流,切记!)
// 连接发起请求,处理服务器响应 (从连接获取到输入流并包装为bufferedReader)
BufferedReader bf = new BufferedReader(new InputStreamReader(connection.getInputStream(), “utf-8”));
String line;
StringBuilder sb = new StringBuilder(); // 用来存储响应数据
// 循环读取流,若不到结尾处
while ((line = bf.readLine()) != null) {
sb.append(line).append(System.getProperty(“line.separator”));
}
bf.close();
connection.disconnect(); // 销毁连接
return sb.toString();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

//GET请求 public static String httpURLConectionGET(String URLParam) {          try {              URL url = new URL(URLParam);    // 把字符串转换为URL请求地址              HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 打开连接              connection.connect();// 连接会话              // 获取输入流              BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));              String line;              StringBuilder sb = new StringBuilder();              while ((line = br.readLine()) != null) {// 循环读取流                  sb.append(line);              }              br.close();// 关闭流              connection.disconnect();// 断开连接             return sb.toString();          } catch (Exception e) {              e.printStackTrace();              System.out.println("失败!");          }          return null;    }   //delete请求 public static String DELETE(String url,Map<String,String> dataForm){          HttpClient httpClient = new HttpClient();          DeleteMethod deleteMethod = new DeleteMethod(url);          List<NameValuePair> data = new ArrayList<NameValuePair>();          if(dataForm!=null){              Set<String> keys = dataForm.keySet();              for(String key:keys){                  NameValuePair nameValuePair = new NameValuePair(key, (String) dataForm.get(key));                  data.add(nameValuePair);              }          }          deleteMethod.setQueryString(data.toArray(new NameValuePair[0]));          try {              int statusCode = httpClient.executeMethod(deleteMethod);              if (statusCode != HttpStatus.SC_OK) {                  return "Method failed: " + deleteMethod.getStatusLine();              }              byte[] responseBody = deleteMethod.getResponseBody();              return new String(responseBody);          } catch (IOException e) {              e.printStackTrace();          }finally {              deleteMethod.releaseConnection();          }          return null;      }  //put 请求 public static String httpURLConnectionPut (String parm,String Url) {          try {              URL url = new URL(Url);            HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 此时cnnection只是为一个连接对象,待连接中              connection.setDoOutput(true);  // 设置连接输出流为true,默认false (post 请求是以流的方式隐式的传递参数)              connection.setDoInput(true);  // 设置连接输入流为true             connection.setRequestMethod("PUT");  // 设置请求方式为post             connection.setUseCaches(false);   // post请求缓存设为false              connection.setInstanceFollowRedirects(true);   // 设置该HttpURLConnection实例是否自动执行重定向              connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");                 connection.connect();  // 建立连接             // 创建输入输出流,用于往连接里面输出携带的参数,(输出内容为?后面的内容)              DataOutputStream dataout = new DataOutputStream(connection.getOutputStream());              dataout.writeBytes(parm);              // 输出完成后刷新并关闭流              dataout.flush();              dataout.close(); // 重要且易忽略步骤 (关闭流,切记!)               // 连接发起请求,处理服务器响应  (从连接获取到输入流并包装为bufferedReader)              BufferedReader bf = new BufferedReader(new InputStreamReader(connection.getInputStream(), "utf-8"));               String line;              StringBuilder sb = new StringBuilder(); // 用来存储响应数据              // 循环读取流,若不到结尾处              while ((line = bf.readLine()) != null) {                  sb.append(line).append(System.getProperty("line.separator"));              }              bf.close();              connection.disconnect(); // 销毁连接              return sb.toString();        } catch (Exception e) {              e.printStackTrace();          }        return null;      }  

}