Some small questions about the use of Fastjson for Jsoup crawl data after spring consolidates velocity

1. Import Jar Package

<project xmlns= "http://maven.apache.org/POM/4.0.0" xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance" xsi: schemalocation= "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" > < Modelversion>4.0.0</modelversion> <groupId>com.zdf.jsoup</groupId> <artifactId>  Zdfjsoup</artifactid> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <dependencies> <dependency> <groupId>org.jsoup</groupId> <artifactid>jsoup</ artifactid> <version>1.11.2</version> </dependency> <dependency> <groupId>  Com.alibaba</groupid> <artifactId>fastjson</artifactId> <version>1.2.45</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId> spring-core</artifactid> <version>4.3.8.RELEASE</version> </dependency> <dependenCy> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.3.8.RELEASE</version> </dependency> <dependency> <groupId> Org.springframework</groupid> <artifactId>spring-webmvc</artifactId> <version>4.3.8.  release</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>4.3.8.RELEASE</version> </ dependency> <dependency> <groupId>org.apache.velocity</groupId> <artifactid>velocity </artifactId> <version>1.6.3</version> </dependency> <dependency> <groupId> Org.apache.velocity</groupid> <artifactId>velocity-tools</artifactId> <version>2.0</ version> </dependency> <dependency> <groupId>log4j</groupId> &LT;ARTIFACtid>log4j</artifactid> <version>1.2.11</version> </dependency> </dependencies> </project>

　　

2. Code writing

Package Com.zdf.jsoup;import Java.io.ioexception;import Java.util.arraylist;import java.util.list;import Org.jsoup.connection;import Org.jsoup.jsoup;import Org.jsoup.nodes.document;import Org.jsoup.nodes.Element;import Org.jsoup.select.elements;import Org.springframework.stereotype.controller;import Org.springframework.web.bind.annotation.requestmapping;import Org.springframework.web.bind.annotation.responsebody;import Com.alibaba.fastjson.json;import Com.zdf.jsoup.domain.Ticket; @Controllerpublic class Jsouptest {@RequestMapping ("/jsouptest") public @ResponseBody List<ticket> jsouptest () {String URL = "Http://dynamic.12306.cn/otn/board/boardMore"; Connection connect = jsoup.connect (URL), try {list<ticket> arr = new arraylist<ticket> ();D ocument Document = C Onnect.get (); Element table = document.getElementById ("Table_board_more"); Elements tr = Table.getelementsbytag ("tr"), for (element Element:tr) {element td = Element.child (0), if (Td.val (). Equals (" Shanghai ")) {System.out.printlN ("Departure:" +td.val () + "terminus:" +element.child (1). Val ()); Ticket Ticket = new Ticket () ticket.setstartplace ("Shanghai"); Ticket.setendplace (Element.child (1). Val ()); Arr.add (Ticket) ;}} return arr;} catch (IOException e) {//TODO auto-generated catch Blocke.printstacktrace ();} return null;} Jump page @requestmapping ("/") public String Tovm () {return "Velocity/ticket";}}

Mistakes made:

1, although import Fastjson.jar but did not configure the conversion in Web. XML, so report no converter found for return value of Type:class java.util.ArrayList

Solution:

<!--processor adapter--><bean class= " Org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter "><property name=" Messageconverters "><list><ref bean=" Mappingfastjsonhttpmessageconverter "/></list></ property></bean><!--View parser--><!--Velocity parser, replacing the original JSP--<bean id= " Mappingfastjsonhttpmessageconverter "          class=" Com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter ">        <property name=" Supportedmediatypes ">            <list>                <value>application/json;charset=UTF-8</value>            </list>        </property>    </bean>

2, just start using JSP to represent the page is the source code, because it is configured by the velocity of the view resolver, so this error will occur

Workaround: Use the VM to import the file

Two ways: Use # include ("ticket.jsp") is the current position to insert the entire ticket.jsp page, adjust as needed.

Some small questions about the use of Fastjson for Jsoup crawl data after spring consolidates velocity