1这个豆瓣的api

https://api.douban.com/v2/book/isbn/:9787549208869

可以以json的形式返回书籍的所有信息

2最开始的时候是我自己写的用代码模拟http请求(参考的是https://www.jb51.net/article/47070.htm)

但不知道为何会有乱码问题 有乱码不怕 怕的就是并不是所有的中文都是乱码 例如在返回出版社信息的时候 长江出版社 这几个字 长江出版可以显示 但是那个社就是两个问号 头疼了好长时间

3 写这个的时候 还碰到一个问题 就是关于字符替换 replace 与replaceAll 后者使用的是正则表达式 而且把/变成/ 着实让我头疼了一下

最后的效果

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);          /**          * 执行一个HTTP GET请求，返回请求响应的HTML          *          * @param url                 请求的URL地址          * @param queryString 请求的查询参数,可以为null          * @param charset         字符集          * @param pretty            是否美化          * @return 返回请求响应的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)                                 //对get请求参数做了http请求默认编码，好像没有任何问题，汉字编码后，就成为%式样的字符串                                 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("执行HTTP Get请求时，编码查询字符串“" + queryString + "”发生异常！", e);                 } catch (IOException e) {                         log.error("执行HTTP Get请求" + url + "时，发生异常！", e);                 } finally {                         method.releaseConnection();                 }                 return response.toString();         }          /**          * 执行一个HTTP POST请求，返回请求响应的HTML          *          * @param url         请求的URL地址          * @param params    请求的查询参数,可以为null          * @param charset 字符集          * @param pretty    是否美化          * @return 返回请求响应的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);                 //设置Http Post数据                 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("执行HTTP Post请求" + url + "时，发生异常！", e);                 } finally {                         method.releaseConnection();                 }                 return response.toString();         }                  /***          * 将json转换为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数据中的双引号改为单引号                                  y=y.replaceAll("////","/");   //以下步骤将/改为/(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("解析错误");                     e.printStackTrace();                 }                                  iteator(map);                 print(map);                }          /***          * 打印书的所有信息          * @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);              }         }                           /***          * 打印书的关键信息          * @param map          */         public static  void print(Map<String, String> map){             System.out.println("*********");             System.out.println("书名  "+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("原价格  "+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"));                      } }

参考资料

//https://lavasoft.blog.51cto.com/62575/175911/
//https://www.cnblogs.com/lanxuezaipiao/archive/2013/05/24/3096437.html