JAVA 项目 - http 实战篇（get）-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_43269407/article/details/105378741

本文介绍如何使用Java通过GET请求从本地服务器下载图片并保存到本地磁盘。示例代码展示了如何建立HTTP连接，读取服务器响应，并将图片数据写入文件。

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前提：已经搭建了一个本地服务器

-URL_PATH为服务器地址-

建立连接

url(aim) -> httpurlconnection(to get) ->inputstream(content)

public static InputStream getInputStream(){
    InputStream inputStream=null;

    URL url= null;
    HttpURLConnection httpURLConnection=null;

    try {
        url = new URL(URL_PATH);
        if(url!=null){
            try {
                httpURLConnection=(HttpURLConnection)url.openConnection();
                httpURLConnection.setConnectTimeout(3000);
                httpURLConnection.setDoInput(true);
                httpURLConnection.setRequestMethod("GET");

                int responseCode=httpURLConnection.getResponseCode();
                if(responseCode==200){
                    inputStream=httpURLConnection.getInputStream();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    } catch (MalformedURLException e) {
        e.printStackTrace();
    }
    return inputStream;
}

下载到本地

Inputstream-> byte类型data数组[1024](中转站) -> fileoutstream(data,0,len) ->注意inputstream、fileoutputstream的关闭 finally

package com.http.get;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

// code
public class HttpUtils {
    private static String URL_PATH = "http://192.168.2.210:8080/pro1.png";

    HttpUtils() {
    }

    public static void saveImageToDisk() {
        InputStream inputStream = getInputStream();
        byte[] data = new byte[1024];
        int len = 0;

        FileOutputStream fileOutputStream = null;
        try {
            fileOutputStream = new FileOutputStream("D:\\test.png");
            while ((len = inputStream.read(data)) != -1) {
                fileOutputStream.write(data, 0, len);
            }
            System.out.println("finish!");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (inputStream != null)
                    inputStream.close();
                if (fileOutputStream != null)
                    fileOutputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    // the input stream
    public static InputStream getInputStream() {
        InputStream inputStream = null;

        URL url = null;
        HttpURLConnection httpURLConnection = null;

        try {
            url = new URL(URL_PATH);
            if (url != null) {
                try {
                    httpURLConnection = (HttpURLConnection) url.openConnection();
                    httpURLConnection.setConnectTimeout(3000);
                    httpURLConnection.setDoInput(true);
                    httpURLConnection.setRequestMethod("GET");

                    int responseCode = httpURLConnection.getResponseCode();
                    if (responseCode == 200) {
                        inputStream = httpURLConnection.getInputStream();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        return inputStream;
    }

    public static void main(String[] args) {
        saveImageToDisk();
    }
}