Android 调用百度识图工具

最近对百度的炮轰不断，我却要写一个跟百度相关的应用工具，简直毫无违和感。不过，秉承着技术无罪的崇高理念，我还是说一些我的实现过程。

最近帮一个朋友写一个Android图像处理的应用，我主要实现功能是调用百度识图对图片进行识别，并从网页提取到返回结果。功能其实很简单，可怜百度公司并没有提供百度识图的API，导致智能通过模拟网页请求的方式实现。

当然在实现的过程中参考了很多大神的博客，然而都被我消化道代码中了，在此不一一列出了。实现的功能主要是：给定图片的路径，可以直接上传文件获取；如果是网络图片，需要给定图片链接。话不多说，直接上代码。

package com.example.baidushitutest;

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;

import android.util.Log;

public class ShituUtils {
private static final String TAG = "ShituUtils";
private static final int TIME_OUT = 10 * 1000; // 超时时间
private static final String CHARSET = "utf-8"; // 设置编码
public static String resolvePostResponse(String postResponseUrl){
String requestUri = "http://image.baidu.com" + postResponseUrl;
HttpGet httpRequest = new HttpGet(requestUri);
String strResult = null;
try {

HttpResponse httpResponse = new DefaultHttpClient()
.execute(httpRequest);

if (httpResponse.getStatusLine().getStatusCode() == 200) {

strResult = EntityUtils.toString(httpResponse
.getEntity());

Document document = Jsoup.parseBodyFragment(strResult);
strResult = document.getElementsByClass("guess-info-not-found-title").text();
if (strResult == ""){
strResult = document.getElementsByClass("guess-info-text").text();
if(strResult == ""){
strResult = document.getElementsByClass("error-msg").text();
}
}
return strResult;
} else {
strResult = "Error Response";
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return strResult;
}

public static String postFile(String filePath, String requestURL) {
int res=0;
String result = null;
String BOUNDARY = UUID.randomUUID().toString(); // 边界标识 随机生成
String PREFIX = "--", LINE_END = "\r\n";
String CONTENT_TYPE = "multipart/form-data"; // 内容类型
File file = new File(filePath);
try {

URL url = new URL(requestURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setReadTimeout(TIME_OUT);
conn.setConnectTimeout(TIME_OUT);
conn.setChunkedStreamingMode(1024 * 1024);// 1024K
conn.setDoInput(true); // 允许输入流
conn.setDoOutput(true); // 允许输出流
conn.setUseCaches(false); // 不允许使用缓存
conn.setRequestMethod("POST"); // 请求方式
conn.setRequestProperty("Charset", CHARSET); // 设置编码
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary="+ BOUNDARY);
if (file != null) {
/**
* 当文件不为空时执行上传
*/
OutputStream outputSteam=conn.getOutputStream();
DataOutputStream dos = new DataOutputStream(outputSteam);

StringBuffer sb = new StringBuffer();
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINE_END);
/**
* 这里重点注意： name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件
* filename是文件的名字，包含后缀名
*/

sb.append("Content-Disposition: form-data; name=\"filedata\"; filename=\""
+ file.getName() + "\"" + LINE_END);
sb.append("Content-Type: application/octet-stream; charset="
+ CHARSET + LINE_END);
sb.append(LINE_END);
dos.write(sb.toString().getBytes());
InputStream is = new FileInputStream(file);

byte[] bytes = new byte[1024];
int len = 0;
while ((len = is.read(bytes)) != -1) {
dos.write(bytes, 0, len);
}
is.close();
dos.write(LINE_END.getBytes());
byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END)
.getBytes();
dos.write(end_data);
dos.flush();
/**
* 获取响应码 200=成功 当响应成功，获取响应的流
*/

res = conn.getResponseCode();

Log.e(TAG, "response code:" + res);
if (res == 200) {
Log.e(TAG, "request success");
InputStream input = conn.getInputStream();
StringBuffer sb1 = new StringBuffer();
int ss;
while ((ss = input.read()) != -1) {
sb1.append((char) ss);
}
result = sb1.toString();
Log.e(TAG, "result : " + result);
} else {
Log.e(TAG, "request error");
}
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return result;
}
public static String baiduShitu(String imageUrl){
String uriAPI = null;
try {
uriAPI = "http://image.baidu.com/n/pc_search?queryImageUrl="+URLEncoder.encode(imageUrl,"utf-8")+"&fm=result&pos=&uptype=paste";
} catch (UnsupportedEncodingException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
HttpGet httpRequest = new HttpGet(uriAPI);
String strResult = null;
try {

HttpResponse httpResponse = new DefaultHttpClient()
.execute(httpRequest);

if (httpResponse.getStatusLine().getStatusCode() == 200) {

strResult = EntityUtils.toString(httpResponse
.getEntity());

Document document = Jsoup.parseBodyFragment(strResult);
strResult = document.getElementsByClass("guess-info-not-found-title").text();
if (strResult == ""){
strResult = document.getElementsByClass("guess-info-text").text();
if(strResult == ""){
strResult = document.getElementsByClass("error-msg").text();
}
}
return strResult;
} else {
strResult = "Error Response";
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return strResult;
}
}

提取网页内容用的工具jsoup，可以从网上下载。这里是实现的一个demo。