网络连接工具类

来源:互联网 发布:大型3d网络手游 编辑:程序博客网 时间:2024/06/10 00:47
package com.lt.an20_utils;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.ByteArrayOutputStream;import java.io.DataOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLEncoder;import java.util.Map;/** * Created by 风情万种冷哥哥 on 2016. * */public class HttpURLConnHelper {    /**     * 作用:实现网络访问文件,将获取到数据储存在文件流中     *      * @param url     *            :访问网络的url地址     * @return inputstream     */    public static InputStream loadFileFromURL(String urlString) {        BufferedInputStream bis = null;        HttpURLConnection httpConn = null;        try {            // 创建url对象            URL urlObj = new URL(urlString);            // 创建HttpURLConnection对象,通过这个对象打开跟远程服务器之间的连接            httpConn = (HttpURLConnection) urlObj.openConnection();            httpConn.setDoInput(true);            httpConn.setRequestMethod("GET");            httpConn.setConnectTimeout(5000);            httpConn.connect();            // 判断跟服务器的连接状态。如果是200,则说明连接正常,服务器有响应            if (httpConn.getResponseCode() == 200) {                // 服务器有响应后,会将访问的url页面中的内容放进inputStream中,使用httpConn就可以获取到这个字节流                bis = new BufferedInputStream(httpConn.getInputStream());                return bis;            }        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                // 对流对象进行关闭,对Http连接对象进行关闭。以便释放资源。                bis.close();            } catch (IOException e) {                e.printStackTrace();            }        }        return null;    }    /**     * 作用:实现网络访问文件,将获取到的数据存在字节数组中     *      * @param url     *            :访问网络的url地址     * @return byte[]     */    public static byte[] loadByteFromURL(String url) {        HttpURLConnection httpConn = null;        BufferedInputStream bis = null;        try {            URL urlObj = new URL(url);            httpConn = (HttpURLConnection) urlObj.openConnection();            httpConn.setRequestMethod("GET");            httpConn.setDoInput(true);            httpConn.setConnectTimeout(5000);            httpConn.connect();            if (httpConn.getResponseCode() == 200) {                bis = new BufferedInputStream(httpConn.getInputStream());                return streamToByte(bis);            }        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                if (bis != null) {                    bis.close();                }            } catch (IOException e) {                e.printStackTrace();            }        }        return null;    }    /**     * 作用:实现网络访问文件,将获取到的数据保存在指定目录中     *      * @param url     *            :访问网络的url地址     * @return byte[]     */    public static boolean saveFileFromURL(String url, File destFile) {        HttpURLConnection httpConn = null;        BufferedInputStream bis = null;        BufferedOutputStream bos = null;        try {            bos = new BufferedOutputStream(new FileOutputStream(destFile));            URL urlObj = new URL(url);            httpConn = (HttpURLConnection) urlObj.openConnection();            httpConn.setRequestMethod("GET");            httpConn.setDoInput(true);            httpConn.setConnectTimeout(5000);            httpConn.connect();            if (httpConn.getResponseCode() == 200) {                bis = new BufferedInputStream(httpConn.getInputStream());                int c = 0;                byte[] buffer = new byte[8 * 1024];                while ((c = bis.read(buffer)) != -1) {                    bos.write(buffer, 0, c);                    bos.flush();                }            }            return true;        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                if (bis != null) {                    bis.close();                }                if (bos != null) {                    bos.close();                }            } catch (IOException e) {                e.printStackTrace();            }        }        return false;    }    /**     * 作用:实现网络访问文件,先给服务器通过“POST”方式提交数据,再返回相应的数据     *      * @param url     *            :访问网络的url地址     * @param params     *            :访问url时,需要传递给服务器的参数。格式为:username=wangxiangjun&password=abcde&     *            qq=32432432     *            为了防止传中文参数时出现编码问题。采用URLEncoder.encode()对含中文的字符串进行编码处理。     *            服务器端会自动对进行过编码的字符串进行decode()解码。     * @return byte[]     */    public static byte[] doPostSubmit(String url, String params) {        BufferedOutputStream bos = null;        BufferedInputStream bis = null;        HttpURLConnection httpConn = null;        try {            URL urlObj = new URL(url);            httpConn = (HttpURLConnection) urlObj.openConnection();            // 如果通过post方式给服务器传递数据,那么setDoOutput()必须设置为true。否则会异常。            // 默认情况下setDoOutput()为false。            // 其实也应该设置setDoInput(),但是因为setDoInput()默认为true。所以不一定要写。            httpConn.setDoInput(true);            httpConn.setDoOutput(true);            httpConn.setRequestMethod("POST");            httpConn.setConnectTimeout(5 * 1000);            // 设置请求方式。请求方式有两种:POST/GET。注意要全大写。            // POST传递数据量大,数据更安全,地址栏中不会显示传输数据。            // 而GET会将传输的数据暴露在地址栏中,传输的数据量大小有限制,相对POST不够安全。但是GET操作灵活简便。            // 判断是否要往服务器传递参数。如果不传递参数,那么就没有必要使用输出流了。            if (params != null) {                byte[] data = params.getBytes();                bos = new BufferedOutputStream(httpConn.getOutputStream());                bos.write(data);                bos.flush();            }            // 判断访问网络的连接状态            if (httpConn.getResponseCode() == 200) {                bis = new BufferedInputStream(httpConn.getInputStream());                // 将获取到的输入流转成字节数组                return streamToByte(bis);            }        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                if (bis != null) {                    bis.close();                }                if (bos != null) {                    bos.close();                }                httpConn.disconnect();            } catch (IOException e) {                e.printStackTrace();            }        }        return null;    }    /**     * 网络访问,上传附件 五个参数: 1、String url:指定表单提交的url地址 2、Map<String, String>     * map:将上传控件之外的其他控件的数据信息存入map对象 3、String filePath:指定要上传到服务器的文件的客户端路径     * 4、byte[] body_data:获取到要上传的文件的输入流信息,通过ByteArrayOutputStream流转成byte[]     * 5、String charset:设置字符集     */    public static String doPostSubmitBody(String url, Map<String, String> map,            String filePath, byte[] body_data, String charset) {        // 设置三个常用字符串常量:换行、前缀、分界线(NEWLINE、PREFIX、BOUNDARY);        final String NEWLINE = "\r\n";        final String PREFIX = "--";        final String BOUNDARY = "#";// 取代---------------------------7df3a01e37070c        HttpURLConnection httpConn = null;        BufferedInputStream bis = null;        DataOutputStream dos = null;        ByteArrayOutputStream baos = new ByteArrayOutputStream();        try {            // 实例化URL对象。调用URL有参构造方法,参数是一个url地址;            URL urlObj = new URL(url);            // 调用URL对象的openConnection()方法,创建HttpURLConnection对象;            httpConn = (HttpURLConnection) urlObj.openConnection();            // 调用HttpURLConnection对象setDoOutput(true)、setDoInput(true)、setRequestMethod("POST");            httpConn.setDoInput(true);            httpConn.setDoOutput(true);            httpConn.setRequestMethod("POST");            // 设置Http请求头信息;(Accept、Connection、Accept-Encoding、Cache-Control、Content-Type、User-Agent)            httpConn.setUseCaches(false);            httpConn.setRequestProperty("Connection", "Keep-Alive");            httpConn.setRequestProperty("Accept", "*/*");            httpConn.setRequestProperty("Accept-Encoding", "gzip, deflate");            httpConn.setRequestProperty("Cache-Control", "no-cache");            httpConn.setRequestProperty("Content-Type",                    "multipart/form-data; boundary=" + BOUNDARY);            httpConn.setRequestProperty(                    "User-Agent",                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30)");            // 调用HttpURLConnection对象的connect()方法,建立与服务器的真实连接;            httpConn.connect();            // 调用HttpURLConnection对象的getOutputStream()方法构建输出流对象;            dos = new DataOutputStream(httpConn.getOutputStream());            // 获取表单中上传控件之外的控件数据,写入到输出流对象(根据HttpWatch提示的流信息拼凑字符串);            if (map != null && !map.isEmpty()) {                for (Map.Entry<String, String> entry : map.entrySet()) {                    String key = entry.getKey();                    String value = map.get(key);                    dos.writeBytes(PREFIX + BOUNDARY + NEWLINE);                    dos.writeBytes("Content-Disposition: form-data; "                            + "name=\"" + key + "\"" + NEWLINE);                    dos.writeBytes(NEWLINE);                    dos.writeBytes(URLEncoder.encode(value.toString(), charset));                    // 或者写成:dos.write(value.toString().getBytes(charset));                    dos.writeBytes(NEWLINE);                }            }            // 获取表单中上传控件的数据,写入到输出流对象(根据HttpWatch提示的流信息拼凑字符串);            if (body_data != null && body_data.length > 0) {                dos.writeBytes(PREFIX + BOUNDARY + NEWLINE);                String fileName = filePath.substring(filePath                        .lastIndexOf(File.separatorChar) + 1);                dos.writeBytes("Content-Disposition: form-data; " + "name=\""                        + "uploadFile" + "\"" + "; filename=\"" + fileName                        + "\"" + NEWLINE);                dos.writeBytes(NEWLINE);                dos.write(body_data);                dos.writeBytes(NEWLINE);            }            dos.writeBytes(PREFIX + BOUNDARY + PREFIX + NEWLINE);            dos.flush();            // 调用HttpURLConnection对象的getInputStream()方法构建输入流对象;            byte[] buffer = new byte[8 * 1024];            int c = 0;            // 调用HttpURLConnection对象的getResponseCode()获取客户端与服务器端的连接状态码。如果是200,则执行以下操作,否则返回null;            if (httpConn.getResponseCode() == 200) {                bis = new BufferedInputStream(httpConn.getInputStream());                while ((c = bis.read(buffer)) != -1) {                    baos.write(buffer, 0, c);                    baos.flush();                }            }            // 将输入流转成字节数组,返回给客户端。            return new String(baos.toByteArray(), charset);        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                if (dos != null) {                    dos.close();                }                if (bis != null) {                    bis.close();                }                if (baos != null) {                    baos.close();                }                httpConn.disconnect();            } catch (Exception e) {                e.printStackTrace();            }        }        return null;    }    public static byte[] streamToByte(InputStream is) {        ByteArrayOutputStream baos = new ByteArrayOutputStream();        int c = 0;        byte[] buffer = new byte[8 * 1024];        try {            while ((c = is.read(buffer)) != -1) {                baos.write(buffer, 0, c);                baos.flush();            }            return baos.toByteArray();        } catch (IOException e) {            e.printStackTrace();        } finally {            try {                if (baos != null) {                    baos.close();                }            } catch (IOException e) {                e.printStackTrace();            }        }        return null;    }}
0 0