HTTP网络通信工具

HttpUtil

package com.xyy.utils;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

public class HttpUtil {

  /**
    * http请求的get方式
    *
    * @param http
    * @return
    */
  public static String get(String http) {
      String result = null;
      try {
        URL url = new URL(http);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        if (conn.getResponseCode() == 200) {
            // 获取服务器端返回内容的输入流
            InputStream in = conn.getInputStream();
            // 创建内容输出流(作用是临时存储内容然后转为byte数组)
            ByteArrayOutputStream dataOut = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int num;
            while ((num = in.read(buffer)) != -1) {
              dataOut.write(buffer, 0, num);
            }
            dataOut.flush();
            result = new String(dataOut.toByteArray());
            dataOut.close();
            in.close();
        }
        conn.disconnect();
      } catch (Exception e) {

      }
      return result;
  }

  /**
    * http的post请求
    *
    * @param http 请求地址
    * @param map 请求参数列表
    * @return
    */
  public static String post(String http, Map<String, String> map) {
      String result = null;
      try {
        URL url = new URL(http);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setDoInput(true);
        conn.setDoOutput(true);
        conn.setConnectTimeout(30000);
        // 设置请求方式为post
        conn.setRequestMethod("POST");
        conn.connect();
        if (map != null) {
            // 提交参数
            StringBuffer sb = new StringBuffer();
            Iterator<Entry<String, String>> it = map.entrySet().iterator();
            while (it.hasNext()) {
              Entry<String, String> entry = it.next();
              sb.append(entry.getKey()).append("=")
                    .append(entry.getValue()).append("&");
            }
            // 将最后一个&去掉
            sb.delete(sb.length() - 1, sb.length());
            String par = sb.toString();
            OutputStreamWriter out = new OutputStreamWriter(
                  conn.getOutputStream(), "UTF-8");
            out.write(par);
            out.flush();
            out.close();
        }
        // 判断是否连接成功
        if (conn.getResponseCode() == 200) {
            InputStream in = conn.getInputStream();
            ByteArrayOutputStream dataOut = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int num;
            while ((num = in.read(buffer)) != -1) {
              dataOut.write(buffer, 0, num);
            }
            dataOut.flush();
            result = new String(dataOut.toByteArray());
            in.close();
            dataOut.close();
        }
        conn.disconnect();
      } catch (Exception e) {

      }
      return result;
  }

  public static String post(String actionUrl, Map<String, String> params,
                      Map<String, File> files) {
      return post(actionUrl, params, files, null);
  }

  // 上传代码，第一个参数，为要使用的URL，第二个参数，为表单内容，第三个参数为要上传的文件，可以上传多个文件
  public static String post(String actionUrl, Map<String, String> params,
                      Map<String, File> files, OnUploadListener l) {
      if (null == files) {
        return post(actionUrl, params);
      }
      String result = null;
      try {
        // 将内容以二进制流形式提交到服务器(需要服务器单独解析)
        String BOUNDARY = java.util.UUID.randomUUID().toString();
        String PREFIX = "--", LINEND = "\r\n";
        String MULTIPART_FROM_DATA = "multipart/form-data";
        String CHARSET = "UTF-8";
        URL uri = new URL(actionUrl);
        HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
        // 读取超时的设置
        conn.setReadTimeout(5 * 1000);
        conn.setDoInput(true);// 允许输入
        conn.setDoOutput(true);// 允许输出
        conn.setUseCaches(false);
        conn.setRequestMethod("POST"); // Post方式
        conn.setRequestProperty("connection", "keep-alive");
        conn.setRequestProperty("Charsert", "UTF-8");
        conn.setRequestProperty("Content-Type", MULTIPART_FROM_DATA
              + ";boundary=" + BOUNDARY);
        // 组装文本类型参数列表
        StringBuilder sb = new StringBuilder();
        if (null != params) {
            for (Map.Entry<String, String> entry : params.entrySet()) {
              sb.append(PREFIX);
              sb.append(BOUNDARY);
              sb.append(LINEND);
              // 传递文本参数的key部分
              sb.append("Content-Disposition: form-data; name=\""
                    + entry.getKey() + "\"" + LINEND);
              sb.append("Content-Type: text/plain; charset=" + CHARSET
                    + LINEND);
              sb.append("Content-Transfer-Encoding: 8bit" + LINEND);
              sb.append(LINEND);
              // 传递文本参数的value部分
              sb.append(entry.getValue());
              sb.append(LINEND);
            }
        }
        DataOutputStream outStream = new DataOutputStream(
              conn.getOutputStream());
        outStream.write(sb.toString().getBytes());
        // 发送文件数据
        if (files != null) {
            int totalSize = 0;
            int currentSize = 0;
            for (Map.Entry<String, File> file : files.entrySet()) {
              totalSize += file.getValue().length();
            }
            for (Map.Entry<String, File> file : files.entrySet()) {
              StringBuilder sb1 = new StringBuilder();
              sb1.append(PREFIX);
              sb1.append(BOUNDARY);
              sb1.append(LINEND);
              sb1.append("Content-Disposition: form-data; name=\"file\"; filename=\""
                    + file.getKey() + "\"" + LINEND);
              sb1.append("Content-Type: multipart/form-data; charset="
                    + CHARSET + LINEND);
              sb1.append(LINEND);
              outStream.write(sb1.toString().getBytes());
              InputStream is = new FileInputStream(file.getValue());
              byte[] buffer = new byte[1024];
              int len = 0;
              while ((len = is.read(buffer)) != -1) {
                  outStream.write(buffer, 0, len);
                  // 上传进度的计算
                  currentSize += len;
                  if (null != l) {
                    l.onProgress(currentSize, totalSize);
                  }
              }
              is.close();
              outStream.write(LINEND.getBytes());
            }
        }
        // 请求结束标志
        byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINEND).getBytes();
        outStream.write(end_data);
        outStream.flush();
        // 判断是否连接成功
        if (conn.getResponseCode() == 200) {
            InputStream in = conn.getInputStream();
            ByteArrayOutputStream dataOut = new ByteArrayOutputStream();
            byte[] buffer = new byte[1024];
            int num;
            while ((num = in.read(buffer)) != -1) {
              dataOut.write(buffer, 0, num);
            }
            dataOut.flush();
            result = new String(dataOut.toByteArray());
            in.close();
            dataOut.close();
        }
        conn.disconnect();
      } catch (Exception e) {
        e.printStackTrace();
      }
      return result;
  }

  public interface OnUploadListener {
      void onProgress(int current, int total);
  }

}