幾點說明
1這個豆瓣的api
https://api.douban.com/v2/book/isbn/:9787549208869
可以以json的形式傳回書籍的所有資訊
2最開始的時候是我自己寫的用代碼模拟http請求(參考的是http://www.jb51.net/article/47070.htm)
但不知道為何會有亂碼問題 有亂碼不怕 怕的就是并不是所有的中文都是亂碼 例如在傳回出版社資訊的時候 長江出版社 這幾個字 長江出版可以顯示 但是那個社就是兩個問号 頭疼了好長時間
3 寫這個的時候 還碰到一個問題 就是關于字元替換 replace 與replaceAll 後者使用的是正規表達式 而且把\變成/ 着實讓我頭疼了一下
最後的效果
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.URIException;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.apache.commons.httpclient.util.URIUtil;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* HTTP工具箱
*
* @author leizhimin 2009-6-19 16:36:18
* @author dlf 2014 12 20 00:19
*/
public final class HttpTookit {
private static Log log = LogFactory.getLog(HttpTookit.class);
/**
* 執行一個HTTP GET請求，傳回請求響應的HTML
*
* @param url 請求的URL位址
* @param queryString 請求的查詢參數,可以為null
* @param charset 字元集
* @param pretty 是否美化
* @return 傳回請求響應的HTML
*/
public static String doGet(String url, String queryString, String charset, boolean pretty) {
StringBuffer response = new StringBuffer();
HttpClient client = new HttpClient();
HttpMethod method = new GetMethod(url);
try {
if (queryString!=null)
//對get請求參數做了http請求預設編碼，好像沒有任何問題，漢字編碼後，就成為%式樣的字元串
method.setQueryString(URIUtil.encodeQuery(queryString));
client.executeMethod(method);
if (method.getStatusCode() == HttpStatus.SC_OK) {
BufferedReader reader = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream(), charset));
String line;
while ((line = reader.readLine()) != null) {
if (pretty)
response.append(line).append(System.getProperty("line.separator"));
else
response.append(line);
}
reader.close();
}
} catch (URIException e) {
log.error("執行HTTP Get請求時，編碼查詢字元串“" + queryString + "”發生異常！", e);
} catch (IOException e) {
log.error("執行HTTP Get請求" + url + "時，發生異常！", e);
} finally {
method.releaseConnection();
}
return response.toString();
}
/**
* 執行一個HTTP POST請求，傳回請求響應的HTML
*
* @param url 請求的URL位址
* @param params 請求的查詢參數,可以為null
* @param charset 字元集
* @param pretty 是否美化
* @return 傳回請求響應的HTML
*/
public static String doPost(String url, Map<String, String> params, String charset, boolean pretty) {
StringBuffer response = new StringBuffer();
HttpClient client = new HttpClient();
HttpMethod method = new PostMethod(url);
//設定Http Post資料
if (params != null) {
HttpMethodParams p = new HttpMethodParams();
for (Map.Entry<String, String> entry : params.entrySet()) {
p.setParameter(entry.getKey(), entry.getValue());
}
method.setParams(p);
}
try {
client.executeMethod(method);
if (method.getStatusCode() == HttpStatus.SC_OK) {
BufferedReader reader = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream(), charset));
String line;
while ((line = reader.readLine()) != null) {
if (pretty)
response.append(line).append(System.getProperty("line.separator"));
else
response.append(line);
}
reader.close();
}
} catch (IOException e) {
log.error("執行HTTP Post請求" + url + "時，發生異常！", e);
} finally {
method.releaseConnection();
}
return response.toString();
}
/***
* 将json轉換為map
* @param jsonString
* @return
* @throws JSONException
*/
public static Map<String, String> toMap(String jsonString) throws JSONException {
JSONObject jsonObject = new JSONObject(jsonString);
Map<String, String> result = new HashMap<String, String>();
Iterator<?> iterator = jsonObject.keys();
String key = null;
String value = null;
while (iterator.hasNext()) {
key = (String) iterator.next();
value = jsonObject.getString(key);
result.put(key, value);
}
return result;
}
public static void main(String[] args) {
String isbn="9787560612850";
String uri="https://api.douban.com/v2/book/isbn/:"+isbn;
parse(uri);
}
public static void parse(String uri) {
String y = doGet(uri, null, "UTF-8", true);
// System.out.println(y);
y=y.replace("\"", "'"); //将得到的json資料中的雙引号改為單引号
y=y.replaceAll("\\\\","/"); //以下步驟将\改為/(url有用)
y=y.replaceAll("//","/");
// System.out.println(y);
Map<String, String> map=null;
try {
map = toMap(y);
} catch (JSONException e) {
// TODO Auto-generated catch block
System.out.println("解析錯誤");
e.printStackTrace();
}
iteator(map);
print(map);
}
/***
* 列印書的所有資訊
* @param map
*/
public static void iteator(Map<String, String> map){
Iterator<?> iter = map.entrySet().iterator();
String key,value;
while(iter.hasNext()) {
Map.Entry entry = (Map.Entry)iter.next();
key = (String)entry.getKey();
value = (String)entry.getValue();
System.out.println(key+" "+value);
}
}
/***
* 列印書的關鍵資訊
* @param map
*/
public static void print(Map<String, String> map){
System.out.println("*********");
System.out.println("書名 "+map.get("title"));
String author=map.get("author").toString();
author=author.replace("[", "");
author=author.replace("]", "");
author=author.replace("\"", "");
System.out.println("作者 "+author);
System.out.println("原價格 "+map.get("price"));
System.out.println("出版社 "+map.get("publisher"));
System.out.println("出版日期 "+map.get("pubdate"));
System.out.println("isbn "+map.get("isbn10"));
Map<String, String> map2=null;
try {
map2=toMap(map.get("images").toString().replace("\"", "'"));
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("small images "+map2.get("small"));
System.out.println("medium images "+map2.get("medium"));
System.out.println("small large "+map2.get("large"));
}
} 參考資料
http://lavasoft.blog.51cto.com/62575/175911
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