初学者-原生Json解析详解

-原生json解析- Stringjson1=name:张三,age:20,sex:男;Stringjson3=bookname:Java速成,price:18.6;JSONObjectjsonobj=newJSONObject(json1);Personperson=newPerson();Bookbooks=newBook();-解析Object-解析完成后放入实体类中-Stringname=jsonobj.getString(name);intage=jsonobj.getInt(age);Stringsex=jsonobj.getString(sex);person.setName(name);person.setAge(age);person.setSex(sex);JSONObjectjsonobj1=newJSONObject(json3);Stringbookname=jsonobj1.getString(bookname);doubleprice=jsonobj1.getDouble(price);books.setBookname(bookname);books.setPrice(price);person.setBooks(books);System.out.println(books);System.out.println(person);/*Stringjson2=苹果,栗子,西瓜;-解析JsonArray-JSONArrayjsonarray=newJSONArray(json2);Listlist=newArrayList();for(inti=0;ijsonarray.length();i+)Stringstr=jsonarray.getString(i);list.add(str);System.out.println(list);*/-JsonObject 和JsonArray 的结合解析Stringjson4=name:李雷,age:16,books:bookname:Java入门到放弃,price:18.9,bookname:C+领进门，从后门跑了,price:18.9,bookname:android这个坑有多深,price:18.9;JSONObjectjsonObject=newJSONObject(json4);Studentstudent=newStudent();Stringname=jsonObject.getString(name);intage=jsonObject.getInt(age);Listbook=newArrayList();JSONArrayjsonArray=jsonObject.getJSONArray(books);for(inti=0;ijsonArray.length();i+)Bookbooks=newBook();JSONObjectjsonObject2=jsonArray.getJSONObject(i);Stringbookname=jsonObject2.getString(bookname);doublepirce=jsonObject2.getDouble(price);books.setBookname(bookname);books.setPicer(pirce);book.add(books);student.setName(name);student.setAge(age);student.setList(book);System.out.println(student);-下载Url到String-从接口中下载数据存到一个String类型的变量中/解析Url为StringpublicstaticStringgetJSONByURL(StringurlStr)InputStreamin=null;ByteArrayOutputStreamout=null;tryURLurl=newURL(urlStr);HttpURLConnectionconn=(HttpURLConnection)url.openConnection();in=conn.getInputStream();out=newByteArrayOutputStream();bytebuffer=newbyte1024;intlen=0;while(len=in.read(buffer)!=-1)out.write(buffer,0,len);bytebs=out.toByteArray();returnnewString(bs);catch(Exceptione)e.printStackTrace();finallyif(in!=null)tryin.close();catch(IOExceptione)e.printStackTrace();returnnull;-用Gson解析首先要创建一个实体类，按照接口里面的格式来创建Stringjson1=name:张三,age:20,sex:男;/PersonStringjson2=苹果,梨子,香蕉;/ListStringjson3=bookname:Java速成,price:18.6;/解析json1Personps=newGson().fromJson(json1,Person.class);System.out.println(ps);/解析json2TypeTokenListtt=newTypeTokenList();Listlist=newGson().fromJson(json2,tt.getType();System.out.println(list);/解析json3Bookbook=newGson().fromJson(json3,Book.class);System.out.println(book);Stringjson4=name:李雷,age:16,books:bookname:Java入门到放弃,price:18.9,bookname:C+领进门，从后门跑了,price:18.9,bookname:android这个坑有多深,price:18.9;Studentstudnent=newGson().fromJson(json4,Student.class);System.out.println(studnent);-一个Gson 和json结合的例子：荔枝新闻解析-荔枝新闻的接口，首先要用URl下载这个接口的数据到String 的json中publicstaticfinalStringURL=/api/GetFeeds?column=0&PageSize=10&pageIndex=1&val=100511D3BE5301280E0992C73A9DEC41;publicstaticvoidmain(Stringargs)throwsJSONException/下载JSONStringjson=HttpUtil.getJSONByURL(URL);/解析JSON-ListListnewsList=newArrayList();JSONObjectjsonObject=newJSONObject(json);Stringisok=jsonObject.getString(status);if(isok.equals(ok)/数据请求成功JSONArraynewsJsonArray=jsonObject.getJSONObject(paramz).getJSONArray(feeds);-先用Json解析，下面再用Gson解析-实体类一定要按照对应格式创建for(inti=0;inewsJsonArray.length();i+)NewsEntitynewsEntity=newNewsEntity();JSONObjectnewObject=newsJsonArray.getJSONObject(i);/解析IDnewsEntity.setId(newObject.getInt(id);/解析标题Stringsubject=newObject.getJSONObject(data).getString(subject);newsEntity.setSubject(subject);/解析简介Stringsummary=newObject.getJSONObject(data).getString(summary);newsEntity.setSummary(summary);/解析图片Stringcover=newObject.getJSONObject(data).getString(cover);newsEntity.setCover(cover);/解析时间Stringchanged=newObject.getJSONObject(data).getString(changed);newsEntity.setChanged(changed);newsList.add(newsEntity);-下面是荔枝新闻的实体类，按照对应格式，然后选取需要的数据来创建 privateintid;/新闻idprivateStringsubject;/新闻标题privateStringsummary;/新闻简介privateStringcover;/新闻图片urlprivateStringchanged;/新闻的最后修改时间publicintgetId()returnid;publicvoidsetId(intid)this.id=id;publicStringgetSubject()returnsubject;publicvoidsetSubject(Stringsubject)this.subject=subject;publicStringgetSummary()returnsummary;publicvoidsetSummary(Stringsummary)this.summary=summary;publicStringgetCover()returncover;publicvoidsetCover(Stringcover)this.cov