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springmvc 基本使用

springmvc 基本使用

作者: 持续进步者 | 来源:发表于2017-02-10 15:20 被阅读47次

web.xml

字符转码
设置DispathcherServlet
配置spring xml
设置对应的url

spring.xml

handlermapping
handleradapter
mvc:annotation-driven
扫描
bean
viewresolver

导入jar

com.springsource.com.mchange.v2.c3p0-0.9.1.2.jar
com.springsource.org.aopalliance-1.0.0.jar
com.springsource.org.apache.commons.logging-1.1.1.jar
com.springsource.org.aspectj.weaver-1.6.8.RELEASE.jar
jstl-1.2.jar
mysql-connector-java-5.1.28-bin.jar
spring-aop-4.3.5.RELEASE.jar
spring-aspects-4.3.5.RELEASE.jar
spring-beans-4.3.5.RELEASE.jar
spring-context-4.3.5.RELEASE.jar
spring-context-support-4.3.5.RELEASE.jar
spring-core-4.3.5.RELEASE.jar
spring-expression-4.3.5.RELEASE.jar
spring-jdbc-4.3.5.RELEASE.jar
spring-orm-4.3.5.RELEASE.jar
spring-test-4.3.5.RELEASE.jar
spring-tx-4.3.5.RELEASE.jar
spring-web-4.3.5.RELEASE.jar
spring-webmvc-4.3.5.RELEASE.jar

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
         http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

<!--post 字符转码-->
<filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>


<!--springmvc servlet-->
<servlet>
    <servlet-name>spmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
     <init-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath:spmvc-servlet.xml</param-value>
     </init-param>
    <load-on-startup>1</load-on-startup>

</servlet>
<servlet-mapping>
    <servlet-name>spmvc</servlet-name>
    <url-pattern>*.do</url-pattern>
</servlet-mapping>


</web-app>

springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:mvc="http://www.springframework.org/schema/mvc"
   xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans.xsd
   http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-4.0.xsd
     http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
   ">

<context:component-scan base-package="com.springmvc.contoller"></context:component-scan>

<mvc:annotation-driven/>

<bean id="myController" name="/hello.do" class="com.springmvc.contoller.HelloWord"></bean>
<bean name="/toadd.do" class="com.springmvc.contoller.ToAdd"></bean>

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <!--<property name="prefix" value="/WEB-INF/jsps/"></property>-->
    <property name="suffix" value=".jsp"></property>

</bean>
</beans>

RestFull 方式

web.xml添加配置

<servlet-mapping>
    <servlet-name>spmvc</servlet-name>
    <url-pattern>/rest/*</url-pattern>
</servlet-mapping>

示例代码

@Controller
@RequestMapping("restfull")
public class RestFullController {
    //http://localhost:8484/springmvc/rest/restfull/update/id/3/name/lihao
    @RequestMapping("/update/id/{id}/name/{name}")
    public String update(Model model,@PathVariable Integer id,@PathVariable     String name){
        User user =  new User();
        user.setId(id);
        user.setUsername("lihao");

        model.addAttribute("name",user);

        return "demo";

    }

    //http://localhost:8484/springmvc/rest/restfull/add/3/lihao
    @RequestMapping("add/{id}/{name}")
    public String add(Model model,@PathVariable Integer id,@PathVariable String name){
        User user =  new User();
        user.setId(id);
        user.setUsername("lihao");
        
        model.addAttribute("name",user);

        return "demo";
    }
}

转发 url地址不改变

@RequestMapping("forward")
public String forward() {
    return "forward:/kuaiyi/param.do";
}

重定向 url地址改变

@RequestMapping("redirect")
public String redirect() {
    return "redirect:/kuaiyi/param.do";
}

springmvc 返回json

添加jar jackson-core-2.5.0.jar

springmvc.xml配置

 <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
    <property name="messageConverters">
        <list >
            <ref bean="mappingJacksonHttpMessageConverter" />
        </list>
    </property>
</bean>
<bean id="mappingJacksonHttpMessageConverter"
      class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
    <property name="supportedMediaTypes">
        <list>
            <value>text/html;charset=UTF-8</value>
        </list>
    </property>
</bean>

示例代码

@RequestMapping("tojson")
@ResponseBody
public User toJson(String name,String sex,String address,String birthday) {
    User user = new User();
    user.setUsername(name);
    user.setSex(sex);
    user.setAddress(address);
    user.setBirthday(birthday);
    System.out.println(user);
    return user;
}

@RequestMapping("mapjson")
@ResponseBody
public Map<String, String> mapJson(String name) {
    HashMap<String, String> map = new HashMap<>();
    map.put("name", name);
    return map;
}    

<script type="text/javascript">
//String name,int age,String address,String birthday
function json() {
    $.ajax({
        type:'POST',
        url:'${pageContext.request.contextPath}/json/tojson.do',
        data:'name=李浩&sex=男&address=北京&birthday=1992-02-08',
        success:function(data){
            console.log(data)
            alert(data.username);
        }
    })
}

</script>

oscache

添加jar

oscache-2.4.1.jar

添加 oscache.properties配置

cache.memory=false
<!-- 缓存文件个数 -->
cache.capacity=1000
cache.persistence.class=com.opensymphony.oscache.plugins.diskpersistence.DiskPersistenceListener
cache.path=/Users/lihao/Downloads/log

全局配置 缓存页面 web.xml

 <filter>
    <filter-name>oscache</filter-name>
    <filter-class>com.opensymphony.oscache.web.filter.CacheFilter</filter-class>
    <init-param>
        <param-name>time</param-name>
        <param-value>3600</param-value>
    </init-param>
    <init-param>
        <param-name>scope</param-name>
        <param-value>application</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>oscache</filter-name>
    <url-pattern>/items/*</url-pattern>
</filter-mapping>

oscache 标签使用

<%@ taglib prefix="oscache" uri="http://www.opensymphony.com/oscache" %>  

现在时间:<%=new Date()%>
<br/>
<oscache:cache >
  缓存时间:<%= new Date()%>
</oscache:cache>


<p>session</p>
现在时间:<%=new Date()%>
<br/>
<oscache:cache scope="session">
  缓存时间:<%= new Date()%>
</oscache:cache>


<p>key</p>
现在时间:<%=new Date()%>
<br/>
<oscache:cache key="cace">
  缓存时间:<%= new Date()%>
</oscache:cache>


现在时间:<%=new Date()%>
<br/>
<oscache:cache  time="4">
  缓存时间:<%= new Date()%>
</oscache:cache>

缓存对象

public class BaseCache extends GeneralCacheAdministrator {

    //过期时间单位(秒)
    private int refreshPeriod;
    //key 缓存前缀
    private String keyPrefix;
    
    
    public BaseCache(String keyPrefix,int refreshPeriod) {
        super();
        this.keyPrefix = keyPrefix;
        this.refreshPeriod = refreshPeriod;
    }

    public void put(String key,Object value) {
        putInCache(keyPrefix+"_"+key,value);
    }


    //expiredTime 单位秒
    public void put(String key,Object value,int expiredTime) {
        putInCache(keyPrefix+"_"+key,value,new ExpiresRefreshPolicy(expiredTime));
    }

    public void remove(String key){
        flushEntry(keyPrefix+"_"+key);
    }

    public void removeAll() {
        flushAll();
    }

    public Object get(String key) throws Exception{
        try {
            return getFromCache(keyPrefix+"_"+key,refreshPeriod);
        } catch (NeedsRefreshException e){
            cancelUpdate(keyPrefix+"_"+key);
            throw e;
        }
    }

    public Object getExpired(String key) throws Exception {
        try {
            return getFromCache(keyPrefix+"_"+key);
        } catch (NeedsRefreshException e){
            cancelUpdate(keyPrefix+"_"+key);
            throw e;
        }

    }


}

public class CacheManager {
    private BaseCache baseCache;

    private static CacheManager instance;
    private static Object lock = new Object();

    private CacheManager () {
        //缓存20秒
        baseCache = new BaseCache("cache",20);
    }

    public static CacheManager getInstance() {
        if(instance == null) {
            synchronized (lock){
                if(instance == null) {
                    instance = new CacheManager();
                }
            }
        }

        return instance;
    }

    public BaseCache getBaseCache() {
        return baseCache;
    }

}

   @Override
public User getUserById(int id)  {
    User user = null;
    try {
        user = (User) CacheManager.getInstance().getBaseCache().get("id:"+id);
    } catch (Exception e) {
        e.printStackTrace();
    }

    if(user == null) {
        user = userMapper.findUserById(id);
        CacheManager.getInstance().getBaseCache().put("id:"+id,user);
    } else{
    }

    return  user;
}

日期类型转换

局部转换

@RequestMapping("submit")
public String submit(String name, Date birthday) {
    System.out.println();
    return "xxx.jsp";
}

@InitBinder
public void initBinder(WebDataBinder binder, WebRequest request) {
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    binder.registerCustomEditor(Date.class,new CustomDateEditor(dateFormat,true));

    SimpleDateFormat dateFormat2 = new SimpleDateFormat("yyyy-MM-dd");
    binder.registerCustomEditor(Date.class,new CustomDateEditor(dateFormat2,true));
}
  • 使用InitBinder注解方法
  • WebDataBinder 通过registerCustomEditor来注册要转换的类型

整体转换

自定义时间转换器
/**
 * Created by lihao on 17/2/17.
 * 日期自定义转换器
 */
public class BindingInitializer implements WebBindingInitializer {
    
    @Override
    public void initBinder(WebDataBinder binder, WebRequest request) {
        //可以写多种日期格式

        //格式1
        DateFormat dateFormat1 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        binder.registerCustomEditor(Date.class,new CustomDateEditor(    dateFormat1,true));

        //格式2
        DateFormat dateFormat2 = new SimpleDateFormat("yyyy-MM-dd ");
        binder.registerCustomEditor(Date.class,new CustomDateEditor(    dateFormat2,true));

        //格式3
        DateFormat dateFormat3 = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
        binder.registerCustomEditor(Date.class,new CustomDateEditor(    dateFormat3,true));

        //格式4
        DateFormat dateFormat4 = new SimpleDateFormat("yyyy/MM/dd");
        binder.registerCustomEditor(Date.class,new CustomDateEditor(    dateFormat4,true));

    }
}
配置spring

<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">

<property name="webBindingInitializer">
<bean class="com.lihao.shangcheng.web.BindingInitializer"/>
</property>
</bean>

2017.2.10

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