Json_ 0 Base _008_ Converts a JSON-formatted "array" string to a list collection

Converts a JSON-formatted "array" string to a list collection.

Apply this technique to get a Java-corresponding object from a JSON object string format.
Jsonobject is a "name.values" collection,
The value portion (string) corresponding to key is obtained by the Get (key) method.
A Jsonobject object can be obtained by Getjsonobject (key).
A Jsonarray object can be obtained by Getjsonarray (key).

To import a jar package:

Write: Po (Bean) Class:

Package Com.west.webcourse.po;/** No. 01 Step: Write The Bean class, * next Com.west.webcourse.servlet.JavaBeanToJOSNString.java*/ Public classPersoninfopo {PrivateString name; Private intAge ; PrivateString sex;  PublicPersoninfopo () {} Public intGetage () {returnAge ; }     Public voidSetage (intAge ) {         This. Age =Age ; }     PublicString Getsex () {returnsex; }     Public voidsetsex (String sex) { This. Sex =sex; }     PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }    }

No. 02 Step: Writing The servlet class:

Package Com.west.webcourse.servlet;import Java.io.ioexception;import java.io.printwriter;import Java.util.arraylist;import Java.util.list;import Javax.servlet.servletexception;import Javax.servlet.http.httpservlet;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.httpservletresponse;import Com.west.webcourse.po.personinfopo;import Net.sf.json.JSONArray; Import Net.sf.json.JSONObject; Public classJavabeantojosnstring extends HttpServlet {personinfopo pif=NewPersoninfopo (); Personinfopo pif01=NewPersoninfopo (); /** No. 03 step: Rewrite the Doget () method, Next: Test*/@Overrideprotected voiddoget (httpservletrequest request, httpservletresponse response) throws Servletexception, IOException { Response.setcontenttype ("Text/html;charset=utf-8"); PrintWriter out=Response.getwriter (); System. out. println ("Conversion");  out. Print ("the converted JSON string:<br/>"); /** Send a JSON-formatted string to the browser*/getjsonstringtobeanlist ();  out. Flush ();  out. Close (); }    /** No. 02 Step: Convert the JSON type string to: List Collection Object*/     PublicList<personinfopo>getjsonstringtobeanlist () {String jsonstring="[{\ "name\": \ "zhang3\", \ "sex\": \ "nan\", \ "age\": \ "30\"},{\ "name\": \ "zhang4\", \ "sex\": \ "nan4\", \ "age\": \ "304\ "}]"; System. out. println (jsonstring); /*2.1: Convert to JSON array*/        Try {            /*2.2: Create the list of Personinfopo objects*/List<PersonInfoPo> LP =NewArraylist<personinfopo>(); /**2.3:json string, converted to Jsonarray array*/Jsonarray Pojsonarray=Jsonarray.fromobject (jsonstring); /** 2.4: Iterate through the array, remove the Jsonobject object and convert it to a Personinfopo object, add to the list*/             for(ObjectObject: Pojsonarray) {Personinfopo pif02=NewPersoninfopo (); /**2.4.1: Converting Jsonobject objects to Personinfopo objects*/pif02= (Personinfopo) Jsonobject.tobean ((Jsonobject)Object, Personinfopo.class);                Lp.add (PIF02); System. out. println ("Loading :"+pif02.getname ()); }            returnLP; } Catch(Exception e) {e.printstacktrace (); }        return NULL; }}

To test the servlet:

Package Com.west.webcourse.servlet;/** * Test*/Import Java.util.list;import Org.junit.beforeclass;import org.junit.test;import Com.west.webcourse.po.PersonInfoPo; Public classJavabeantojosnstringtest {Staticjavabeantojosnstring JS; @BeforeClass Public Static voidSetupbeforeclass () throws Exception {JS=Newjavabeantojosnstring (); } @Test Public voidtestgetjsonstringtobeanlist () {List<PersonInfoPo> lp=js.getjsonstringtobeanlist ();  for(Personinfopo person:lp) {System. out. println ("test, loop out:"+person.getname ()); }    }}

Json_ 0 Base _008_ Converts a JSon-formatted "array" string to a list collection