繼續沿用代碼。。

1. 修改User.java，修改代碼如下

public class User implements Serializable {

    private String name;
    private String password;
    private Date birthday;

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", password='" + password + '\'' +
                ", birthday=" + birthday +
                '}';
    }
}

2. 在index.jsp中添加如下代碼

<form action="hello/testConvertor" method="post">
    姓名：<input type="text" name="name"/>
    密碼：<input type="text" name="password"/>
    生日：<input type="text" name="birthday"/>

    <input type="submit" value="提交"/>
</form>

3. 在HelloController.java``中添加如下代碼

@RequestMapping(value = "/testConvertor")
    public String testConvertor(User user) {
        System.out.println("testConvertor方法執行了");
        System.out.println(user);
        return "success";
    }

4. 創建如下轉換器目錄

• StringToDate.java

  public class StringToDate implements Converter<String, Date> {
      /**
       * 將字符串按照自己定義的模式進行日期類型轉換
       * @param s 傳入的字符串
       * @return
       */
      @Override
      public Date convert(String s) {
          // 判斷字符串是否為空
          if (s == null || s.trim().equals("")){
              throw new RuntimeException("用戶輸入有誤或未輸入");
          }
          DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
  
          try {
              // 進行日期轉換后返回轉換結果
              return format.parse(s);
          } catch (ParseException e) {
              e.printStackTrace();
              throw new RuntimeException("數據類型轉換出現錯誤");
          }
      }
  }
  

5. 在springmvc.xml文件中添加如下代碼

	<!--配置自定義類型轉換器-->
    <bean class="org.springframework.context.support.ConversionServiceFactoryBean" id="conversionServiceFactoryBean">
        <property name="converters">
            <set>
                <bean class="com.it.Converter.StringToDate"/>
            </set>
        </property>
    </bean>
    <!-- 配置spring開啟注解mvc的支持 -->
    <mvc:annotation-driven conversion-service="conversionServiceFactoryBean"/>
</beans>

6. 啟動tomcat進行測試

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• 注意這樣做后，以前的默認的輸入方式“1777/5/21”則失效