springmvc高級1

1日期類型轉換

1.1 自定義Converter

public class CustomDateConverter implements Converter<String,Date>{

 

              @override

              public Date convert(String source){

                            try{

                               SimpleDateFormat simpleDateFormat

                                          = new SimpleDateFormat("yyy-MM-dd HH-mm-ss");

                         return simpleDateFormat.parse(source);

             

                            }catch(Exception e){

                                          e.printStackTrace();

                            }

                            return null;

              }

}

 

<mvc:annotation-driven conversion-service="conversionService">

</mvc:annotation-driven>

<!-- conversionService -->

       <bean id="conversionService"

              class="org.springframework.format.support.FormattingConversionServiceFactoryBean">

              <!-- 轉換器 -->

              <property name="converters">

                     <list>

                            <bean class="cn.itcast.ssm.controller.converter.CustomDateConverter"/>

                     </list>

              </property>

       </bean>

 

1.2 JsonUtil

@Component

public class JsonUtil {

 

    public static final ObjectMapper mapper;

 

    static {

        SimpleDateFormat dateFormat = new SimpleDateFormat(Constants.YYYY_MM_DD_HH_MM_SS);

        mapper =new ObjectMapper();

       

        Calendar cal = Calendar.getInstance();

        TimeZone tz = cal.getTimeZone();

       

        TimeZone.setDefault(tz);

        mapper.setTimeZone(tz);

        mapper.setDateFormat(dateFormat);

    }

 

    public static String toJson(Object obj) {

        try {

            return mapper.writeValueAsString(obj);

        } catch (Exception e) {

            throw new RuntimeException("轉換json字符失敗!");

        }

    }

 

    public <T extends Object> T toObject(String json, Class<T> clazz) {

       

        try {

            return mapper.readValue(json, clazz);

        } catch (IOException e) {

            throw new RuntimeException("將json字符轉換爲對象時失敗!");

        }catch (Exception e) {

            throw new RuntimeException("轉換json字符失敗!");

1.3 mappingJackson2HttpMessageConverter

              <!-- 使用緩存mvc註解配置 -->

              <mvc:annotation-driven>

                            <mvc:message-converters>

                                          <bean id="mappingJackson2HttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">

                                                        <property name="objectMapper">

                                                                      <bean class="com.fasterxml.jackson.databind.ObjectMapper">

                                                                                    <property name="dateFormat">

                                                                                                  <bean class="java.text.SimpleDateFormat">

                                                                                                                <constructor-arg type="java.lang.String" value="yyyy-MM-dd HH:mm:ss" />

                                                                                                  </bean>

                                                                                    </property>

                                                                      </bean>

                                                        </property>

                                          </bean>

                            </mvc:message-converters>

              </mvc:annotation-driven>

2 集合類

2.1字符串數組

頁面定義以下：

頁面選中多個checkbox向controller方法傳遞

<input type="checkbox" name="item_id" value="001"/>

<input type="checkbox" name="item_id" value="002"/>

<input type="checkbox" name="item_id" value="002"/>

 

傳遞到controller方法中的格式是：001,002,003

 

Controller方法中能夠用String[]接收，定義以下：

public String deleteitem(String[] item_id)throws Exception{

                System.out.println(item_id);

｝

    }

2.2 List

List中存放對象，並將定義的List放在包裝類中，action使用包裝對象接收。

List中對象：

成績對象

Public class QueryVo {

Private List<Items> itemList;//訂單明細

 

  //get/set方法..

}

包裝類中定義List對象，並添加get/set方法以下：

頁面：

 

 

<tr>

<td>

<input type="text" name=" itemList[0].id" value="${item.id}"/>

</td>

<td>

<input type="text" name=" itemList[0].name" value="${item.name }"/>

</td>

<td>

<input type="text" name=" itemList[0].price" value="${item.price}"/>

</td>

</tr>

<tr>

<td>

<input type="text" name=" itemList[1].id" value="${item.id}"/>

</td>

<td>

<input type="text" name=" itemList[1].name" value="${item.name }"/>

</td>

<td>

<input type="text" name=" itemList[1].price" value="${item.price}"/>

</td>

</tr>

Contrller方法定義以下：

 

public String useraddsubmit(Model model,QueryVo queryVo)throws Exception{

System.out.println(queryVo.getItemList());

}

2.3 Map

在包裝類中定義Map對象，並添加get/set方法，action使用包裝對象接收。

包裝類中定義Map對象以下：

Public class QueryVo {

private Map<String, Object> itemInfo = new HashMap<String, Object>();

  //get/set方法..

}

 

頁面定義以下：

 

<tr>

<td>學生信息：</td>

<td>

姓名：<inputtype="text"name="itemInfo['name']"/>

年齡：<inputtype="text"name="itemInfo['price']"/>

.. .. ..

</td>

</tr>

 

Contrller方法定義以下：

 

public String useraddsubmit(Model model,QueryVo queryVo)throws Exception{

System.out.println(queryVo.getStudentinfo());

}

 

3.1 上傳圖片

<bean

id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

                            <property name="defaultEncoding">

                                          <value>UTF-8</value>

                            </property>

                            <property name="maxUploadSize">

                                          <value>800000000</value>

                            </property>

</bean>

 

 

}