spring_mvc 筆記－JoshS的部落格

spring 2.5後有個好用的東西 "@Autowired" 用途就是我們在bean設定的值，可以直接用@Autowired來取

Ex:

(一)

首先xml內要匯入已下資訊

xxx.spring.xml:

<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

<bean id="seasons_list"
class="java.util.ArrayList">
<constructor-arg>
<list>
<value>Spring</value>
<value>Summer</value>
<value>Autumn</value>
<value>Winter</value>
</list>
</constructor-arg>
</bean>

xxx.java

private ArrayList seasons_list;
@Autowired
public void setSeasons_list(ArrayList seasonsList) {
seasons_list = seasonsList;
}

(二)

xxx.spring.xml:

xxx.java:

@Autowired
private Car car;

@RequestParam和@PathVariable？

@RequestParam(value="abc", required=false) int abc

指網頁傳過來的requestParam

@PathVariable取到的值是URI參數ex:?aaa=11

@PathVariable String aaa

第二個範例參考網址:http://java.chinaitlab.com/Spring/951955.html

=================================================================================================================

首先:

webconfig:

<servlet>
<servlet-name>SpringFrontCtrler</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/configs/*.spring.xml</param-value> (也就是一開始會跑這裡的相關.spring.xml)
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

*.spring.xml 共三支

1.app-config.spring.xml

2.mvc-config.spring.xml

3.service-config.spring.xml

app-config.spring.xml:

<bean id="appConfig"
class="duke.soccer.config.AppConfig">
<property name="dataDirectory">
<value>D:\workspace\private\gjun\edu_materials\WebAppTechCamp-Spring\solution\Spring3\lab05\DukeSoccerLeague\WebContent\WEB-INF\data</value>
</property>
</bean>

先解釋這段:

也就是說會跑去"duke.soccer.config.AppConfig" 這個class

然後並傳直給對應的dataDirectory內值就是<value>內的 D:\workspace\private\gjun\edu_materials\WebAppTec......

duke.soccer.config.AppConfig (AppConfig.java) :

public class AppConfig implements IAppConfig{
private String dataDirectory;

public String getDataDirectory() {
return dataDirectory;
}

public void setDataDirectory(String dataDirectory) {
this.dataDirectory = dataDirectory;
}

}

service-config.spring.xml

<bean id="leagueService"
class="duke.soccer.service.LeagueService"
lazy-init="true">
<constructor-arg>
<value>#{appConfig.dataDirectory}</value>
</constructor-arg>
</bean>

appConfig.dataDirectory 對應到了 app-config.spring.xml 內的bean中Id為appConfig 剛剛有回傳 dataDirectory(還是只model??問一下)

同樣的傳至 duke.soccer.service.LeagueService 內帶值為 appConfig.dataDirectory

duke.soccer.service.LeagueService:

public class LeagueService {

/** The cache of League objects. */
private static final List<League> LEAGUES_CACHE = new LinkedList<League>();

private String dataDirectory;

public LeagueService(String dataDirectory) {
this.dataDirectory = dataDirectory;
// Make sure that the leagues cache has been initialized
synchronized ( LEAGUES_CACHE ) {
if ( LEAGUES_CACHE.isEmpty() ) {
cacheLeagues();
}
}
}

/**
* This method returns a complete set of leagues.
*/
public List<League> getAllLeagues() {
// Return an immutable List; which makes this read-only
return Collections.unmodifiableList(LEAGUES_CACHE);
}

// more code ......

dataDirectory 又對應到LeagueService.java 內的 dataDirectory

於是又繼續往下跑完程式

mvc-config.spring.xml

<bean name="/list_leagues.do"
class="duke.soccer.web.ctrler.spring.ListLeaguesCtrler">
<property name="leagueSvc">
<ref bean="leagueService"/>
</property>
<property name="view">
<value>list_leagues</value>
</property>
</bean>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/jsp/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>

從"/list_leagues.do" 開始看，也就是我們的導頁就由這來控制了

下面的"leagueSvc" 也就是去ListLeaguesCtrler.jsp 設定"leagueSvc"值是去參考 bean="leagueService"

而"view"就是設定 ListLeaguesCtrler.jsp 內的view 設定為"list_leagues"

值得一提的是下方的 InternalResourceViewResolver

先看下方ListLeaguesCtrler.jsp 內

@Override
public ModelAndView handleRequest(HttpServletRequest request,
HttpServletResponse response) throws Exception {
// TODO Auto-generated method stub
List leagueList = leagueSvc.getAllLeagues();
ModelAndView mv = new ModelAndView(view,"leagueList",leagueList);
return mv;

ModelAndView mv = new ModelAndView(view,"leagueList",leagueList); 這段的view

也就是我們所傳的"list_leagues" ，回傳回來後(return mv) 後

<property name="prefix">
<value>/jsp/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>

就會被放入/jsp/ 路徑內

然後變成 XXXX.jsp 而 XXXX也就是view中的"list_leagues" = list_leagues.jsp

============================================================================================

@Controller

也就是controller 另一種更方便的用法:

而在spring.xml內也務必加上下面紅字的部分:

[

<context:component-scan base-package="duke.soccer.web.ctrler.spring"/>

]

接著我們只要正常的使用.do即可

Ex:

index.jsp:

<ul>
<li><a href='add_league_form.do'>Add a new league</a></li>
</ul>

XXX.java:

@Controller
public class AddLeaguesCtrler {
@RequestMapping("/add_league_form")
public ModelAndView input(){
String inputView = "add_league";
Map models = new HashMap();
models.put("seasons_list", seasons_list);
ModelAndView mv = new ModelAndView(inputView,models);
return mv;
}

private ArrayList seasons_list;
@Autowired
public void setSeasons_list(ArrayList seasonsList) {
seasons_list = seasonsList;
}

private LeagueService leagueService;
@Autowired
public void setLeagueService(LeagueService leagueService) {
this.leagueService = leagueService;
}

@RequestMapping("/add_league")
public ModelAndView add(League league){
League pleague = leagueService.createLeague(league.getYear(),
league.getSeason(),
league.getTitle());
String successView = "success";
ModelAndView mv = new ModelAndView(successView,"league",pleague);
return mv;
}

以上程式說明:

首先@Controller部分，類別掛上後可看當所對應的@RequestMapping，也就是xxx.do所對應的

以第一個("/add_league_form")來看，對應的就是add_league_form.do

以上就是spring mvc的一些檔案基本設定方式