{"id":4623,"date":"2019-09-14T22:02:53","date_gmt":"2019-09-14T14:02:53","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=4623"},"modified":"2019-09-14T22:02:53","modified_gmt":"2019-09-14T14:02:53","slug":"%e5%a6%82%e4%bd%95%e7%94%a8java%e4%b8%8b%e8%bd%bdbinary%e6%96%87%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/4623.html","title":{"rendered":"\u5982\u4f55\u7528Java\u4e0b\u8f7dbinary\u6587\u4ef6"},"content":{"rendered":"\n

=Start=<\/p>\n\n\n\n

\u7f18\u7531\uff1a<\/h4>\n\n\n\n

\u672c\u6587\u4e3b\u8981\u662f\u5bf9\u4e4b\u524d\u8bb0\u5f55\u7684\u300cJava\u4e2d\u5982\u4f55\u53d1\u8d77HTTP\u8bf7\u6c42<\/a>\u300d\u4e00\u6587\u7684\u8865\u5145\/\u4fee\u6b63\uff0c\u5f53\u65f6\u53ea\u8003\u8651\u4e86\u7528Java\u53d1\u8d77GET\/POST\u8bf7\u6c42\uff0c\u7136\u540e\u8bfb\u53d6\u8fd4\u56de\u7684\u6587\u672c\u683c\u5f0f\u7684response\u4fe1\u606f\uff0c\u5728\u4e0b\u8f7d\u6587\u672c\u683c\u5f0f\u7684\u6587\u4ef6\u65f6\u6ca1\u5565\u95ee\u9898\uff0c\u4f46\u662f\u5bf9\u4e8ebinary\u7b49\u975e\u6587\u672c\u683c\u5f0f\u7684\u6587\u4ef6\u65f6\u5c31\u6709\u95ee\u9898\u4e86\uff0c\u8fd9\u91cc\u8bb0\u5f55\u4e00\u4e0b\u89e3\u51b3\u529e\u6cd5\u4ee5\u53ca\u4ea7\u751f\u8fd9\u4e2a\u95ee\u9898\u7684\u539f\u56e0\uff0c\u65b9\u4fbf\u4ee5\u540e\u53c2\u8003\u3002<\/p>\n\n\n\n

\u6b63\u6587\uff1a<\/h4>\n\n\n\n
\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n\n\n\n

\u5f53\u4f60\u60f3\u4e0b\u8f7d\u4e00\u4e2a\u4e8c\u8fdb\u5236\u6587\u4ef6\u65f6\uff0c\u4e0d\u8981\u5c06 InputStream \u5d4c\u5165\u4efb\u4f55\u7684 Reader \u7c7b\u578b\u53d8\u91cf\u4e2d\uff0c\u800c\u5e94\u8be5\u662f stream \u683c\u5f0f\u8bfb\u5165\uff0c\uff08\u53ef\u4ee5\u501f\u52a9\u4e8e\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u4f5c\u4e3a\u7f13\u51b2\u533a\uff09\u7136\u540e stream \u683c\u5f0f\u5199\u51fa\u3002<\/strong><\/p>\n\n\n\n

\u5982\u679c\u4f60\u5728\u8fd9\u4e2d\u95f4\u4f7f\u7528\u4e86\u4efb\u4f55\u7c7b\u578b\u7684 Reader \u53d8\u91cf\uff0c\u5c06\u5185\u5bb9\u5148\u8f6c\u6362\u6210\u4e86 \u5b57\u7b26\/\u5b57\u7b26\u4e32 \u518d\u5199\u51fa\u81f3\u6587\u4ef6\uff0c\uff08\u5927\u6982\u7387\uff09\u5c31\u4f1a\u53d7\u5230\u5e73\u53f0\u7f16\u7801\u65b9\u5f0f\u7684\u5f71\u54cd\uff0c\u6700\u540e\u7684\u7ed3\u679c\u53ef\u80fd\u5c31\u548c\u4f60\u9884\u671f\u7684\u4e0d\u4e00\u81f4\u4e86\u3002<\/p>\n\n\n\n

If you are trying to read a binary stream, you should NOT wrap the InputStream in a Reader of any kind.Read the data into a byte array buffer using the InputStream.read(byte[], int, int) method. Then write from the buffer to a FileOutputStream.<\/p><\/blockquote>\n\n\n\n

\u4f7f\u7528 HttpClient \u548c FileUtils.copyInputStreamToFile \u4ee5\u53ca FileOutputStream \u7684\u65b9\u5f0f\uff1a<\/p>\n\n\n\n

package com.ixyzero.learn.utils;

import org.apache.commons.io.FileUtils;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;

\/**
 * Created by ixyzero on 2019\/9\/14.
 *\/
public class DownloadBinaryFile {

    \/\/ HttpURLConnection download from remote url to local file
    public static void httpGetBinary2(String url, File file) {
        URL obj = null;
        HttpURLConnection con = null;
        try {
            obj = new URL(url);
            con = (HttpURLConnection) obj.openConnection();

            con.setRequestMethod(\"GET\");
            con.setRequestProperty(\"User-Agent\", \"Mozilla\/5.0\");

            int responseCode = con.getResponseCode();
            System.out.println(\"\\nSending 'GET' request to URL : \" + url);
            System.out.println(\"Response Code : \" + responseCode);

            InputStream inputStream = con.getInputStream();
            byte[] buffer = new byte[4096];
            int n;

            OutputStream output = new FileOutputStream( file );
            while ((n = inputStream.read(buffer)) != -1) {
                output.write(buffer, 0, n);
            }
            output.close();

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (ProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    \/\/ HttpClient download from remote url to local file
    public static void httpGetBinary(String url, File file) {
        HttpClient client = HttpClientBuilder.create().build();
        \/\/ code below adds HTTP REDIRECT support to GET and POST methods
        \/\/ HttpClient client = HttpClientBuilder.create().setRedirectStrategy(new LaxRedirectStrategy()).build();

        HttpGet request = new HttpGet(url);
        request.addHeader(\"User-Agent\", \"Mozilla\/5.0\");

        try {
            HttpResponse response = client.execute(request);
            System.out.println(\"Response Code : \" + response.getStatusLine().getStatusCode());

            InputStream inputStream = response.getEntity().getContent();

            FileUtils.copyInputStreamToFile(inputStream, file);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            \/\/
        }

    }

    public static void main(String[] args) {
        DownloadBinaryFile downloader = new DownloadBinaryFile();
        String url1 = \"https:\/\/www.cnblogs.com\/images\/logo_small.gif\";
        String filepath1 = \"\/path\/to\/logo.gif\";
        String filepath2 = \"\/path\/to\/logo2.gif\";

        downloader.httpGetBinary(url1, new File(filepath1));
        downloader.httpGetBinary2(url1, new File(filepath2));
    }
}<\/pre>\n\n\n\n
\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n\n\n\n