java下載圖片,java下載圖片保存到指定目錄下,返回url

本文目錄一覽：

• 1、Java編寫一下圖片下載程序？
• 2、能不能用JAVA編寫一個程序從網上下載一張圖片呢？求完整程序！
• 3、java如何從數據庫中下載以二進制存儲的圖片
• 4、java從服務器下載圖片怎麼講圖片保存到本地的sdcard上
• 5、java關於下載圖片。
• 6、java中怎麼把當前項目中images文件夾中的圖片下載到本地磁盤中？？

Java編寫一下圖片下載程序？

樓上的寫的沒錯，不過感覺太麻煩了，用hutool工具包來寫個方法

HttpUtil.downloadFile(“”, new File(“F://demo4/baidu_logo.png”));

第一個參數為百度logo圖片，第二個為我本地下載位置，下載結果如圖

能不能用JAVA編寫一個程序從網上下載一張圖片呢？求完整程序！

package com.capinfotech.net; 

import java.io.ByteArrayOutputStream; 

import java.io.File; 

import java.io.FileOutputStream; 

import java.io.IOException; 

import java.io.InputStream; 

import java.net.HttpURLConnection; 

import java.net.URL; 

public class ImageRequest { 

    public static void main(String[] args) throws IOException { 

        URL url = new URL(“”); 

        HttpURLConnection conn = (HttpURLConnection)url.openConnection(); 

        InputStream inputStream = conn.getInputStream();   //通過輸入流獲得圖片數據 

        byte[] getData = readInputStream(inputStream);     //獲得圖片的二進制數據 

        File imageFile = new File(“tupian.jpg”);   

        FileOutputStream fos = new FileOutputStream(imageFile);    

        fos.write(getData); 

        fos.close(); 

        System.out.println(” read picture success”); 

    } 

    public static  byte[] readInputStream(InputStream inputStream) throws IOException { 

        byte[] buffer = new byte[1024]; 

        int len = 0; 

        ByteArrayOutputStream bos = new ByteArrayOutputStream(); 

        while((len = inputStream.read(buffer)) != -1) { 

            bos.write(buffer, 0, len); 

        } 

        bos.close(); 

        return bos.toByteArray(); 

    } 

}

java如何從數據庫中下載以二進制存儲的圖片

/**

* Created by IntelliJ IDEA.

* User: ljt

* Date: 2003-3-31

* Time: 18:51:38

* To change this template use Options | File Templates.

*/

import oracle.jdbc.driver.OraclePreparedStatement;

import oracle.jdbc.driver.OracleResultSet;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.Statement;

import java.sql.Clob;

public class TestOpenDoc {

public OracleResultSet ors = null; //**這裡rs一定要用Oracle提供的

public OraclePreparedStatement opst = null; //**PreparedStatement用

public Connection conn = null;

public Statement stmt = null;

public TestOpenDoc() {

}

public boolean getConnect() {

//這是我的數據庫所在

String serverName = “prosrv”;

try {

Class.forName(“oracle.jdbc.driver.OracleDriver”);

String url = “jdbc:oracle:thin:@” + serverName + “:1521:BOHDATA”;

conn = DriverManager.getConnection(url, “appuser”, “appuser”);

}

catch (Exception e) {

System.out.println(e);

return false;

}

return true;

}

public static void main(String[] args) {

TestOpenDoc test = new TestOpenDoc();

if (!test.getConnect()) {

System.out.println(“數據庫連結錯誤”);

return ;

}

try{

test.conn.setAutoCommit(false);

byte a[] = null; //**將測試文件test.doc讀入此字節數組

java.io.FileInputStream fin = null;

java.io.FileOutputStream fout = null;

//Oracle提供的

try {

java.io.File f1 = new java.io.File(“c:/test.doc”);

java.io.File f2 = new java.io.File(“d:/testout.doc”); //**從BLOB讀出的信息寫

//入該文 件，和源文件對比測試用

fin = new java.io.FileInputStream(f1);

fout = new java.io.FileOutputStream(f2);

int flength = (int) f1.length(); //**讀入文件的字節長度

System.out.println(“file length::” + flength);

a = new byte[flength];

int i = 0;

int itotal = 0;

//* 將文件讀入字節數組

for (; itotal flength; itotal = i + itotal) {

i = fin.read(a, itotal, flength – itotal);

}

fin.close();

System.out.println(“read itotal::” + itotal);

//**注意Oracle的 BLOB一定要用EMPTY_BLOB()初始化

String mysql =

“insert into filelist (FileName,FileSize,FileBody) values (?,?,EMPTY_BLOB())”;

OraclePreparedStatement opst = (OraclePreparedStatement) test.conn.

prepareStatement(mysql);

opst.setString(1, “wordtemplate2”);

opst.setInt(2, flength);

opst.executeUpdate();

opst.clearParameters();

// /**插入其它數據後，定位BLOB字段

mysql = “select filebody from filelist where filename=?”;

opst = (OraclePreparedStatement) test.conn.prepareStatement(mysql);

opst.setString(1, “wordtemplate2”);

OracleResultSet ors = (OracleResultSet) opst.executeQuery();

if (ors.next()) {

oracle.sql.BLOB blob = ors.getBLOB(1); //**得到BLOB字段

int j = blob.putBytes(1, a); //**將字節數組寫入BLOB字段

System.out.println(“j:” + j);

test.conn.commit();

ors.close();

Clob clob;

clob = ors.getClob(“”);

String str;

str = clob.toString();

str = clob.getSubString(0L,(int)clob.length());

System.out.println(str);

}

System.out.println(“insert into ok”);

byte b[] = null; //**保存從BLOB讀出的字節

opst.clearParameters();

mysql = “select filebody from filelist where filename=?”;

opst = (OraclePreparedStatement) test.conn.

prepareStatement(mysql);

opst.setString(1, “wordtemplate2”);

ors = (OracleResultSet) opst.executeQuery();

if (ors.next()) {

oracle.sql.BLOB blob2 = ors.getBLOB(1);

System.out.println(“blob2 length:” + blob2.length());

b = blob2.getBytes(1, flength); //**從BLOB取出字節流數據

System.out.println(“b length::” + b.length);

test.conn.commit();

}

ors.close();

// 將從BLOB讀出的字節寫入文件

fout.write(b, 0, b.length);

fout.close();

System.out.println(“write itotal::” + b.length);

}

catch (Exception e) {

System.out.println(“errror :” + e.toString());

e.printStackTrace();

}

finally { //**關閉所有數據聯接

test.conn.commit();

}

}

catch(Exception e){

System.out.println(e);

}

}

}

java從服務器下載圖片怎麼講圖片保存到本地的sdcard上

ublic HttpServletResponse download(String path, HttpServletResponse response) {

try {

// path是指欲下載的文件的路徑。

File file = new File(path);

// 取得文件名。

String filename = file.getName();

// 取得文件的後綴名。

String ext = filename.substring(filename.lastIndexOf(“.”) + 1).toUpperCase();

// 以流的形式下載文件。

InputStream fis = new BufferedInputStream(new FileInputStream(path));

byte[] buffer = new byte[fis.available()];

fis.read(buffer);

fis.close();

// 清空response

response.reset();

// 設置response的Header

response.addHeader(“Content-Disposition”, “attachment;filename=” + new String(filename.getBytes()));

response.addHeader(“Content-Length”, “” + file.length());

OutputStream toClient = new BufferedOutputStream(response.getOutputStream());

response.setContentType(“application/octet-stream”);

toClient.write(buffer);

toClient.flush();

toClient.close();

} catch (IOException ex) {

ex.printStackTrace();

}

return response;

}

java關於下載圖片。

URL url = new URL(“圖片地址”);

File outFile = new File(“圖片保存到本地路徑”);

OutputStream os = new FileOutputStream(outFile);

InputStream is = url.openStream();

byte[] buff = new byte[1024];

while(true) {

int readed = is.read(buff);

if(readed == -1) {

break;

}

byte[] temp = new byte[readed];

System.arraycopy(buff, 0, temp, 0, readed);

os.write(temp);

}

is.close();

os.close();

java中怎麼把當前項目中images文件夾中的圖片下載到本地磁盤中？？

將項目中images文件夾中文件的絕對路徑作為超鏈接，點擊鏈接就可以下載了。至於下載到本地那個磁盤就是用戶自己選擇了。