Json_ 0 Base _006_ Converts a JSON-formatted string into a Java object

Demand:
Converts a JSON-formatted string into a Java object.

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).

The jar package that needs to be imported:

Write the 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; }    }

To write a servlet:

Package Com.west.webcourse.servlet;import Java.io.ioexception;import java.io.printwriter;import Java.util.arraylist;import java.util.hashmap;import java.util.hashset;import Java.util.list;import java.util.Map; Import Java.util.set;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*/Getjsonstringtobean ();  out. Flush ();  out. Close (); }        /** No. 02 Step: Convert the JSON type string to: Po class*/     Public voidGetjsonstringtobean () {String jsonstring="{\ "name\": \ "zhang3\", \ "sex\": \ "nan\", \ "age\": \ "30\"}"; Jsonobject Jsonobject=Jsonobject.fromobject (jsonstring); Pif01= (Personinfopo) Jsonobject.tobean (Jsonobject,personinfopo.class); System. out. println ("Name:"+pif01.getname () +": Gender:"+pif01.getsex () +": Age:"+pif01.getage ()); }}

To write a test class:

Package Com.west.webcourse.servlet;/** No. 04 Step: Test * Next: Configure Web. XML*/import Org.junit.beforeclass;import org.junit.Test; Public classJavabeantojosnstringtest {Staticjavabeantojosnstring JS; @BeforeClass Public Static voidSetupbeforeclass () throws Exception {JS=Newjavabeantojosnstring (); } @Test Public voidJsonstringtobean () {Js.getjsonstringtobean (); }}

Json_ 0 Base _006_ Converts a JSON-formatted string into a Java object