SpringMVC 自定義類型轉換器

先准備一個JavaBean（Employee） 一個Handler（SpringMVCTest） 一個converters（EmployeeConverter）

要實現的輸入一個字符串轉換成一個employee的對象

1.寫一個jsp

<h1>自定義類型的轉換器</h1>
  <form:form action="testConversionServiceConverer">
    <input type="text" name="employee" />
    <input type="submit" value="Submit" />      
  </form:form>

2.寫SpringMVCTest

@Controller
public class SpringMVCTest {
    
    @Autowired
    private EmployeeDao employeeDao;
    
    @RequestMapping(value="/testConversionServiceConverer")
    public String testConverter(@RequestParam("employee") Employee employee){
        System.out.println("save: "+employee);
        employeeDao.save(employee);
        return "redirect:/emps";
    }
}

3.寫EmployeeConverter

@Component
public class EmployeeConverter implements Converter<String, Employee>{

    @Override
    public Employee convert(String source) {
        if(source != null){
            String [] vals = source.split("-");
            if(vals !=null && vals.length==4){
                String lastName = vals[0];
                String email = vals[1];
                Integer gender = Integer.parseInt(vals[2]);
                Department department = new Department();
                department.setId(Integer.parseInt(vals[3]));
                
                Employee employee = new Employee(null, lastName, email, gender, department);
                System.out.println(source+"-convert-"+employee);
                return employee;
            }
        }
        return null;
    }

}

4.進行配置springmvc.xml

<mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven>
    
    
    <!-- 配置conversionService -->
    <!-- 
        1.先配置conversionService
        2.在 mvc:annotation-driven 標簽 添加conversion-service="conversionService"
     -->
    <bean id="conversionService"
        class="org.springframework.context.support.ConversionServiceFactoryBean">
        <property name="converters">
            <set>
            <!--employeeConverter EmployeeConverter類的 首字母小寫即可  -->
                <ref bean="employeeConverter"/>
            </set>
        </property>
    </bean>