httpURLConnectionUtils

package com.util;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by Administrator on 2017/11/1 0001.
 */
public class httpURLConnectionUtils {
    private static int BUFFER_SIZE = 10240;
    public final static boolean DEBUG = true; // 调试用

    /**
     * 获取字符串 get
     * @param destUrl
     * @return
     */
    public static String httpGetRequest(String destUrl) {
        try {
            // 1. 得到访问地址的URL
            URL url = new URL(destUrl);
            // 2. 得到网络访问对象java.net.HttpURLConnection
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            /* 3. 设置请求参数（过期时间，输入、输出流、访问方式），以流的形式进行连接 */
            // 设置是否向HttpURLConnection输出
            connection.setDoOutput(false);
            // 设置是否从httpUrlConnection读入
            connection.setDoInput(true);
            // 设置请求方式
            connection.setRequestMethod("GET");
            // 设置是否使用缓存
            connection.setUseCaches(true);
            // 设置此 HttpURLConnection 实例是否应该自动执行 HTTP 重定向
            connection.setInstanceFollowRedirects(true);
            // 设置超时时间
            connection.setConnectTimeout(3000);
            // 连接
            connection.connect();
            // 4. 得到响应状态码的返回值 responseCode
            int code = connection.getResponseCode();
            // 5. 如果返回值正常，数据在网络中是以流的形式得到服务端返回的数据
            String msg = "";
            if (code == 200) { // 正常响应
                // 从流中读取响应信息
                BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                String line = null;
                while ((line = reader.readLine()) != null) { // 循环从流中读取
                    msg += line + "\n";
                }
                reader.close(); // 关闭流
            }
            // 6. 断开连接，释放资源
            connection.disconnect();

            // 显示响应结果
            //System.out.println(msg);
            return msg;
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "";
    }
    /**
     * 获取文件流 get
     * @param destUrl
     * @param fileName
     * @return
     */
    public static int httpGetRequest(String destUrl,String fileName) {
        FileOutputStream fos = null;
        BufferedInputStream bis = null;
        HttpURLConnection httpUrl = null;
        URL url = null;
        byte[] buf = new byte[BUFFER_SIZE];
        int size = 0;
        try {
            // 建立链接
            url = new URL(destUrl);
            httpUrl = (HttpURLConnection) url.openConnection();
            // 连接指定的资源
            httpUrl.connect();
            // 获取网络输入流
            bis = new BufferedInputStream(httpUrl.getInputStream());
            // 建立文件
            fos = new FileOutputStream(fileName);

            if (DEBUG)
                System.out.println("正在获取链接[" + destUrl + "]的内容...\n将其保存为文件["+ fileName + "]");
            // 保存文件
            while ((size = bis.read(buf)) != -1)
                fos.write(buf, 0, size);

            fos.close();
            bis.close();
            httpUrl.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return 1;
    }
    public static String httpPoetRequest(String destUrl,Map
 
   params) {
        URL url = null;
        StringBuffer paramsStr = new StringBuffer();
        for (Map.Entry
  
    param : params.entrySet()) { paramsStr.append(param.getKey()); paramsStr.append("&"); paramsStr.append(String.valueOf(param.getValue())); } try { url = new URL(destUrl); HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(); httpURLConnection.setRequestMethod("POST");// 提交模式 // conn.setConnectTimeout(10000);//连接超时 单位毫秒 // conn.setReadTimeout(2000);//读取超时 单位毫秒 // 发送POST请求必须设置如下两行 httpURLConnection.setDoOutput(true); httpURLConnection.setDoInput(true); // 获取URLConnection对象对应的输出流 PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream()); // 发送请求参数 printWriter.write(paramsStr.toString());//post的参数 xx=xx&yy=yy // flush输出流的缓冲 printWriter.flush(); //开始获取数据 BufferedInputStream bis = new BufferedInputStream(httpURLConnection.getInputStream()); ByteArrayOutputStream bos = new ByteArrayOutputStream(); int len; byte[] arr = new byte[1024]; while((len=bis.read(arr))!= -1){ bos.write(arr,0,len); bos.flush(); } bos.close(); return bos.toString("utf-8"); } catch (Exception e) { e.printStackTrace(); } return ""; } /** * 获取文件流 Poet * @param destUrl * @param fileName * @return */ public static int httpPoetRequest(String destUrl,Map
   
     params,String fileName) { FileOutputStream fos = null; BufferedInputStream bis = null; URL url = null; byte[] buf = new byte[BUFFER_SIZE]; int size = 0; StringBuffer paramsStr = new StringBuffer(); for (Map.Entry
    
      param : params.entrySet()) { paramsStr.append(param.getKey()); paramsStr.append("&"); paramsStr.append(String.valueOf(param.getValue())); } try { url = new URL(destUrl); HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection(); httpURLConnection.setRequestMethod("POST"); httpURLConnection.setDoOutput(true); httpURLConnection.setDoInput(true); // 获取URLConnection对象对应的输出流 PrintWriter printWriter = new PrintWriter(httpURLConnection.getOutputStream()); // 发送请求参数 printWriter.write(paramsStr.toString());//post的参数 xx=xx&yy=yy // flush输出流的缓冲 printWriter.flush(); //开始获取数据 bis = new BufferedInputStream(httpURLConnection.getInputStream()); // 建立文件 fos = new FileOutputStream(fileName); if (DEBUG) System.out.println("正在获取链接[" + destUrl + "]的内容...\n将其保存为文件["+ fileName + "]"); // 保存文件 while ((size = bis.read(buf)) != -1) fos.write(buf, 0, size); fos.close(); bis.close(); httpURLConnection.disconnect(); } catch (Exception e) { e.printStackTrace(); } return 1; } public static void main(String[] args) { String destUrl = "http://localhost:8075/WebReport/ReportServer?reportlet=WorkBook1.cpt&format=pdf&aa=12"; String fileName = "D:/aa.pdf"; // int i = httpURLConnectionUtils.httpGetRequest(destUrl, fileName); Map
     
       map = new HashMap
      
       (); map.put("aa","qwe"); int s = httpURLConnectionUtils.httpPoetRequest(destUrl,map,fileName); System.out.println("httpURLConnectionUtils.httpGetRequest:"+s); } }