[文件] HttpDownloader.java
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import java.io.BufferedReader;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.net.HttpURLConnection;
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import java.net.MalformedURLException;
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import java.net.URL;
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/***
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* 通过http协议下载文件
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* ***/
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public class HttpDownloader {
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private URL url = null;
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public InputStream getInputStreamFormUrl(String urlStr)
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throws MalformedURLException,IOException{
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url = new URL(urlStr);
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HttpURLConnection httpc = (HttpURLConnection)url.openConnection();
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return httpc.getInputStream();
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}
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public String downloadText(String urlStr){
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StringBuffer sb = new StringBuffer();
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String line = null;
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BufferedReader breader = null;
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try{
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url = new URL(urlStr);
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HttpURLConnection httpc = (HttpURLConnection)url.openConnection();
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InputStream inputs = httpc.getInputStream();
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breader = new BufferedReader(new InputStreamReader(inputs));
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while((line=breader.readLine())!=null){
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sb.append(line);
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}
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}catch(Exception e){
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e.printStackTrace();
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}finally{
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try {
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breader.close();
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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return sb.toString();
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}
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public int downloadFile(String urlStr,String path,String name){
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InputStream input = null;
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try{
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FileUtils fu = new FileUtils();
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if(fu.isFileExist(path+name)){// 是否存在文件，如果存在返回1
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return 1;
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}else{
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input = getInputStreamFormUrl(urlStr);
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File f = fu.inputStream2File(path, name, input);软件开发
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if(f==null){
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return -1;// 数据有异常的时候返回-1
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}
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input.close();
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}
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}catch(Exception e){
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e.printStackTrace();
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return -1;
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}
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return 0;// 数据正常的时候返回0
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}
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}
