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Java实现Http工具类的封装操作示例

2019年07月19日  | 移动技术网IT编程  | 我要评论

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本文实例讲述了java实现http工具类的封装操作。分享给大家供大家参考，具体如下：

http工具类的实现：（通过apache包）第一个类

import java.io.ioexception;
import org.apache.http.httpentity;
import org.apache.http.httpresponse;
import org.apache.http.httpstatus;
import org.apache.http.client.clientprotocolexception;
import org.apache.http.client.httpclient;
import org.apache.http.client.methods.httpget;
import org.apache.http.util.entityutils;
import com.gooagoo.stcu.utils.http.httpclientutils;
public class httprequest {
  private string errormessage; // 錯誤信息
  /**
   * http請求字符串資源
   *
   * @param url
   *      url地址
   * @return 字符串資源
   * */
  public string httprequeststring(string url) {
    string result = null;
    try {
      httpentity httpentity = httprequest(url);
      if (httpentity != null) {
        result = entityutils.tostring(httpentity, "urf-8"); // 使用utf-8編碼
      }
    } catch (ioexception e) {
      errormessage = e.getmessage();
    }
    return result;
  }
  /**
   * http請求字節數組資源
   *
   * @param url
   *      url地址
   * @return 字節數組資源
   * */
  public byte[] httprequestbytearray(string url) {
    byte[] result = null;
    try {
      httpentity httpentity = httprequest(url);
      if (httpentity != null) {
        result = entityutils.tobytearray(httpentity);
      }
    } catch (ioexception e) {
      errormessage = e.getmessage();
    }
    return result;
  }
  /**
   * 使用http get方式請求
   *
   * @param url
   *      url地址
   * @return httpentiry對象
   * */
  private httpentity httprequest(string url) {
    httpentity result = null;
    try {
      httpget httpget = new httpget(url);
      httpclient httpclient = httpclientutils.gethttpclient();
      httpresponse httpresponse;
      httpresponse = httpclient.execute(httpget);
      int httpstatuscode = httpresponse.getstatusline().getstatuscode();
      /*
       * 判斷http狀態碼是否為200
       */
      if (httpstatuscode == httpstatus.sc_ok) {
        result = httpresponse.getentity();
      } else {
        errormessage = "http: " + httpstatuscode;
      }
    } catch (clientprotocolexception e) {
      errormessage = e.getmessage();
    } catch (ioexception e) {
      errormessage = e.getmessage();
    }
    return result;
  }
  /**
   * 返回錯誤消息
   *
   * @return 錯誤信息
   * */
  public string geterrormessage() {
    return this.errormessage;
  }
}

第二个类的实现：

package com.demo.http;
import java.net.unknownhostexception;
import java.util.arraylist;
import java.util.hashmap;
import java.util.iterator;
import java.util.list;
import java.util.map;
import java.util.map.entry;
import org.apache.http.httpresponse;
import org.apache.http.httpstatus;
import org.apache.http.namevaluepair;
import org.apache.http.client.httpclient;
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.params.basichttpparams;
import org.apache.http.params.httpconnectionparams;
import org.apache.http.protocol.http;
import org.apache.http.util.entityutils;
public class httpclientutils {
  private static final int request_timeout = 5 * 1000;// 设置请求超时10秒钟
  private static final int so_timeout = 10 * 1000; // 设置等待数据超时时间10秒钟
  // static parsexml parsexml = new parsexml();
  // 初始化httpclient，并设置超时
  public static httpclient gethttpclient() {
    basichttpparams httpparams = new basichttpparams();
    httpconnectionparams.setconnectiontimeout(httpparams, request_timeout);
    httpconnectionparams.setsotimeout(httpparams, so_timeout);
    httpclient client = new defaulthttpclient(httpparams);
    return client;
  }
  public static boolean dopost(string url) throws exception {
    httpclient client = gethttpclient();
    httppost httppost = new httppost(url);
    httpresponse response;
    response = client.execute(httppost);
    if (httpstatus.sc_ok == response.getstatusline().getstatuscode()) {
      return true;
    }
    client.getconnectionmanager().shutdown();
    return false;
  }
  /**
   * 与远程交互的返回值post方式
   *
   * @param hashmap
   * @param url
   * @return
   */
  public static string gethttpxml(hashmap<string, string> hashmap, string url) {
    string responsemsg = "";
    httppost request = new httppost(url);
    list<namevaluepair> params = new arraylist<namevaluepair>();
    iterator<map.entry<string, string>> iter = hashmap.entryset()
        .iterator();
    while (iter.hasnext()) {
      entry<string, string> entry = iter.next();
      params.add(new basicnamevaluepair(entry.getkey(), entry.getvalue()));
    }
    try {
      request.setentity(new urlencodedformentity(params, http.utf_8));
      httpclient client = httpclientutils.gethttpclient();
      httpresponse response = client.execute(request);
      if (response.getstatusline().getstatuscode() == 200) {
        responsemsg = entityutils.tostring(response.getentity());
      }
    } catch (unknownhostexception e) {
      e.printstacktrace();
    } catch (exception e) {
      e.printstacktrace();
    }
    return responsemsg;
  }
  /**
   * map转字符串 拼接参数
   *
   * @param hashmap
   * @return
   */
  public static string maptostring(hashmap<string, string> hashmap) {
    string paramestr = "";
    iterator<map.entry<string, string>> iter = hashmap.entryset()
        .iterator();
    while (iter.hasnext()) {
      entry<string, string> entry = iter.next();
      paramestr += "&" + entry.getkey() + "=" + entry.getvalue();
    }
    if (paramestr.contains("&")) {
      paramestr = paramestr.replacefirst("&", "?");
    }
    return paramestr;
  }
}

更多关于java相关内容感兴趣的读者可查看本站专题：《java socket编程技巧总结》、《java文件与目录操作技巧汇总》、《java数据结构与算法教程》、《java操作dom节点技巧总结》和《java缓存操作技巧汇总》

希望本文所述对大家java程序设计有所帮助。

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