Java tutorial
/* * Copyright (c) 2013. lim (lim@gmail.com) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.example.base.http; import java.io.BufferedInputStream; import java.io.BufferedReader; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.Locale; import org.apache.http.HttpResponse; import org.apache.http.protocol.HTTP; /** * ?? * @author lim * */ public class ResponseStream extends InputStream { private HttpResponse baseResponse; private InputStream baseStream; private String charset; private String requestUrl; private long expiry; public ResponseStream(HttpResponse baseResponse, String requestUrl, long expiry) throws IOException { this(baseResponse, HTTP.UTF_8, requestUrl, expiry); } public ResponseStream(HttpResponse baseResponse, String charset, String requestUrl, long expiry) throws IOException { if (baseResponse == null) { throw new IllegalArgumentException("baseResponse may not be null"); } this.baseResponse = baseResponse; this.baseStream = baseResponse.getEntity().getContent(); this.charset = charset; this.requestUrl = requestUrl; this.expiry = expiry; } private String directResult; public ResponseStream(String result) throws IOException { if (result == null) { throw new IllegalArgumentException("result may not be null"); } directResult = result; } public String getRequestUrl() { return requestUrl; } public InputStream getBaseStream() { return baseStream; } public HttpResponse getBaseResponse() { return baseResponse; } public int getStatusCode() { if (directResult != null) return 200; return baseResponse.getStatusLine().getStatusCode(); } public Locale getLocale() { if (directResult != null) return Locale.getDefault(); return baseResponse.getLocale(); } public String getReasonPhrase() { if (directResult != null) return ""; return baseResponse.getStatusLine().getReasonPhrase(); } public String readString() throws IOException { if (directResult != null) return directResult; if (baseStream == null) return null; try { BufferedReader reader = new BufferedReader(new InputStreamReader(baseStream, charset)); StringBuilder sb = new StringBuilder(); String line = ""; while ((line = reader.readLine()) != null) { sb.append(line); } directResult = sb.toString(); if (requestUrl != null) { //?? AppHttpClient.mHttpGetCache.put(requestUrl, directResult, expiry); } return directResult; } finally { if (baseStream != null) { try { baseStream.close(); } catch (Throwable e) { e.fillInStackTrace(); } } } } public void readFile(String savePath) throws IOException { if (directResult != null) return; if (baseStream == null) return; FileOutputStream out = null; try { out = new FileOutputStream(savePath); BufferedInputStream ins = new BufferedInputStream(baseStream); byte[] buffer = new byte[4096]; int len = 0; while ((len = ins.read(buffer)) != -1) { out.write(buffer, 0, len); } out.flush(); } finally { if (out != null) { try { out.close(); } catch (Throwable e) { } } if (baseStream != null) { try { baseStream.close(); } catch (Throwable e) { } } } } @Override public int read() throws IOException { if (baseStream == null) return -1; return baseStream.read(); } @Override public int available() throws IOException { if (baseStream == null) return 0; return baseStream.available(); } @Override public void close() throws IOException { if (baseStream == null) return; baseStream.close(); } @Override public void mark(int readLimit) { if (baseStream == null) return; baseStream.mark(readLimit); } @Override public boolean markSupported() { if (baseStream == null) return false; return baseStream.markSupported(); } @Override public int read(byte[] buffer) throws IOException { if (baseStream == null) return -1; return baseStream.read(buffer); } @Override public int read(byte[] buffer, int offset, int length) throws IOException { if (baseStream == null) return -1; return baseStream.read(buffer, offset, length); } @Override public synchronized void reset() throws IOException { if (baseStream == null) return; baseStream.reset(); } @Override public long skip(long byteCount) throws IOException { if (baseStream == null) return 0; return baseStream.skip(byteCount); } }