怀化新站优化,wordpress nginx安装目录,wordpress 404跳转首页,建站培训班本文介绍了JAVA通过HttpURLConnection 上传和下载文件的方法#xff0c;分享给大家#xff0c;具体如下#xff1a;HttpURLConnection文件上传HttpURLConnection采用模拟浏览器上传的数据格式#xff0c;上传给服务器上传代码如下#xff1a;package com.util;import java…本文介绍了JAVA通过HttpURLConnection 上传和下载文件的方法分享给大家具体如下HttpURLConnection文件上传HttpURLConnection采用模拟浏览器上传的数据格式上传给服务器上传代码如下package com.util;import java.io.BufferedInputStream;import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import java.util.Iterator;import java.util.Map;/*** Java原生的API可用于发送HTTP请求即java.net.URL、java.net.URLConnection这些API很好用、很常用* 但不够简便** 1.通过统一资源定位器(java.net.URL)获取连接器(java.net.URLConnection) 2.设置请求的参数 3.发送请求* 4.以输入流的形式获取返回内容 5.关闭输入流** author H__D**/public class HttpConnectionUtil {/*** 多文件上传的方法** param actionUrl上传的路径* param uploadFilePaths需要上传的文件路径数组* return*/SuppressWarnings(finally)public static String uploadFile(String actionUrl, String[] uploadFilePaths) {String end \r\n;String twoHyphens --;String boundary *****;DataOutputStream ds null;InputStream inputStream null;InputStreamReader inputStreamReader null;BufferedReader reader null;StringBuffer resultBuffer new StringBuffer();String tempLine null;try {// 统一资源URL url new URL(actionUrl);// 连接类的父类抽象类URLConnection urlConnection url.openConnection();// http的连接类HttpURLConnection httpURLConnection (HttpURLConnection) urlConnection;// 设置是否从httpUrlConnection读入默认情况下是true;httpURLConnection.setDoInput(true);// 设置是否向httpUrlConnection输出httpURLConnection.setDoOutput(true);// Post 请求不能使用缓存httpURLConnection.setUseCaches(false);// 设定请求的方法默认是GEThttpURLConnection.setRequestMethod(POST);// 设置字符编码连接参数httpURLConnection.setRequestProperty(Connection, Keep-Alive);// 设置字符编码httpURLConnection.setRequestProperty(Charset, UTF-8);// 设置请求内容类型httpURLConnection.setRequestProperty(Content-Type, multipart/form-data;boundary boundary);// 设置DataOutputStreamds new DataOutputStream(httpURLConnection.getOutputStream());for (int i 0; i uploadFilePaths.length; i) {String uploadFile uploadFilePaths[i];String filename uploadFile.substring(uploadFile.lastIndexOf(//) 1);ds.writeBytes(twoHyphens boundary end);ds.writeBytes(Content-Disposition: form-data; name\file i \;filename\ filename \ end);ds.writeBytes(end);FileInputStream fStream new FileInputStream(uploadFile);int bufferSize 1024;byte[] buffer new byte[bufferSize];int length -1;while ((length fStream.read(buffer)) ! -1) {ds.write(buffer, 0, length);}ds.writeBytes(end);/* close streams */fStream.close();}ds.writeBytes(twoHyphens boundary twoHyphens end);/* close streams */ds.flush();if (httpURLConnection.getResponseCode() 300) {throw new Exception(HTTP Request is not success, Response code is httpURLConnection.getResponseCode());}if (httpURLConnection.getResponseCode() HttpURLConnection.HTTP_OK) {inputStream httpURLConnection.getInputStream();inputStreamReader new InputStreamReader(inputStream);reader new BufferedReader(inputStreamReader);tempLine null;resultBuffer new StringBuffer();while ((tempLine reader.readLine()) ! null) {resultBuffer.append(tempLine);resultBuffer.append(\n);}}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {if (ds ! null) {try {ds.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if (reader ! null) {try {reader.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if (inputStreamReader ! null) {try {inputStreamReader.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}if (inputStream ! null) {try {inputStream.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}return resultBuffer.toString();}}public static void main(String[] args) {// 上传文件测试String str uploadFile(http://127.0.0.1:8080/image/image.do,new String[] { /Users//H__D/Desktop//1.png,//Users/H__D/Desktop/2.png });System.out.println(str);}}HttpURLConnection文件下载下载代码如下package com.util;import java.io.BufferedInputStream;import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.net.URLConnection;import java.util.Iterator;import java.util.Map;/*** Java原生的API可用于发送HTTP请求即java.net.URL、java.net.URLConnection这些API很好用、很常用* 但不够简便** 1.通过统一资源定位器(java.net.URL)获取连接器(java.net.URLConnection) 2.设置请求的参数 3.发送请求* 4.以输入流的形式获取返回内容 5.关闭输入流** author H__D**/public class HttpConnectionUtil {/**** param urlPath* 下载路径* param downloadDir* 下载存放目录* return 返回下载文件*/public static File downloadFile(String urlPath, String downloadDir) {File file null;try {// 统一资源URL url new URL(urlPath);// 连接类的父类抽象类URLConnection urlConnection url.openConnection();// http的连接类HttpURLConnection httpURLConnection (HttpURLConnection) urlConnection;// 设定请求的方法默认是GEThttpURLConnection.setRequestMethod(POST);// 设置字符编码httpURLConnection.setRequestProperty(Charset, UTF-8);// 打开到此 URL 引用的资源的通信链接(如果尚未建立这样的连接)。httpURLConnection.connect();// 文件大小int fileLength httpURLConnection.getContentLength();// 文件名String filePathUrl httpURLConnection.getURL().getFile();String fileFullName filePathUrl.substring(filePathUrl.lastIndexOf(File.separatorChar) 1);System.out.println(file length---- fileLength);URLConnection con url.openConnection();BufferedInputStream bin new BufferedInputStream(httpURLConnection.getInputStream());String path downloadDir File.separatorChar fileFullName;file new File(path);if (!file.getParentFile().exists()) {file.getParentFile().mkdirs();}OutputStream out new FileOutputStream(file);int size 0;int len 0;byte[] buf new byte[1024];while ((size bin.read(buf)) ! -1) {len size;out.write(buf, 0, size);// 打印下载百分比// System.out.println(下载了------- len * 100 / fileLength // %\n);}bin.close();out.close();} catch (MalformedURLException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {return file;}}public static void main(String[] args) {// 下载文件测试downloadFile(http://localhost:8080/images/1467523487190.png, /Users/H__D/Desktop);}}以上就是本文的全部内容希望对大家的学习有所帮助也希望大家多多支持脚本之家。
