Json_ 0 Base _005_ to convert the PO (Bean) Object Collection list to a JSON-formatted object string, returned to the interface

Source: Internet
Author: User

Converts a list of PO (Bean) objects to a JSON-formatted object string, which is returned to the interface

To import a jar package:

Write: Po (bean) Code:

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 the servlet code:

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; 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*/         out. Print (getbeanstojsonstring ());  out. Flush ();  out. Close (); }    /** No. 02 Step: Create a JSON format string conversion method: Convert a collection of PO objects to a JSON type string*/     PublicString getbeanstojsonstring () {Pif.setage (1); Pif.setname ("name"); Pif.setsex ("Sex"); Pif01.setage (101); Pif01.setname ("name01"); Pif01.setsex ("sex01"); List LP=NewArrayList ();        Lp.add (PIF);        Lp.add (PIF01); Jsonarray Beantojsonarray=NewJsonarray (). FROMOBJECT (LP); System. out. println (Beantojsonarray); returnbeantojsonarray.tostring (); }}

To test the servlet code:

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 voidtesttojsonstring () {js.getbeanstojsonstring (); }}

Configure Web. XML:

<?xml version="1.0"encoding="UTF-8"? ><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="Http://java.sun.com/xml/ns/javaee"xsi:schemalocation="Http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"version="2.5"> <display-name></display-name> <servlet> <description>This</description> <dis Play-name>this</display-name> <servlet-name>JavaBeanToJOSNString</servlet-name> < servlet-class>com.west.webcourse.servlet.javabeantojosnstring</servlet-class> </servlet> <servlet-mapping> <servlet-name>JavaBeanToJOSNString</servlet-name> <ur L-pattern>/javabeantojosnstring</url-pattern> </servlet-mapping> <welcome-file-list> < Welcome-file>personinfo.jsp</welcome-file> </welcome-file-list></web-app>

Authoring Interface: personinfo.jsp

<%@ page language="Java"import="java.util.*"pageencoding="UTF-8"%><%String Path=Request.getcontextpath (); String BasePath= Request.getscheme () +"://"+ request.getservername () +":"+Request.getserverport ()+ Path +"/";%><! DOCTYPE HTML Public"-//w3c//dtd HTML 4.01 transitional//en">Basehref="<%=basePath%>"><title>my JSP'personinfo.jsp'Starting Page</title><meta http-equiv="pragma"Content="No-cache"><meta http-equiv="Cache-control"Content="No-cache"><meta http-equiv="Expires"Content="0"><meta http-equiv="keywords"Content="Keyword1,keyword2,keyword3"><meta http-equiv="Description"Content="This is my page"><!--<link rel="stylesheet"Type="Text/css"href="Styles.css">-->dynamically get the directory for the current project's ContextPath: ${pagecontext.request.contextpath}<br> <a href="javabeantojosnstring"> Send request to servlet </a> <br></body>

Json_ 0 Base _005_ to convert the PO (Bean) Object Collection list to a JSON-formatted object string, returned to the interface

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