SpringMVC自定义类型转换器

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本文介绍如何在SpringMVC中实现自定义类型转换器，通过实例演示将请求参数中的字符串转换为Employee对象的过程。具体包括创建JavaBean、Handler、自定义转换器类以及在配置文件中的设置。

转载地址:https://www.cnblogs.com/xkl520xka/p/6934011.html

SpringMVC 自定义类型转换器

先准备一个JavaBean（Employee）一个Handler（SpringMVCTest）一个converters（EmployeeConverter）

要实现的输入一个字符串转换成一个employee的对象

1.写一个jsp

1 <h1>自定义类型的转换器</h1>
2   <form:form action="testConversionServiceConverer">
3     <input type="text" name="employee" />
4     <input type="submit" value="Submit" />      
5   </form:form>

2.写SpringMVCTest

 1 @Controller
 2 public class SpringMVCTest {
 3     
 4     @Autowired
 5     private EmployeeDao employeeDao;
 6     
 7     @RequestMapping(value="/testConversionServiceConverer")
 8     public String testConverter(@RequestParam("employee") Employee employee){
 9         System.out.println("save: "+employee);
10         employeeDao.save(employee);
11         return "redirect:/emps";
12     }
13 }

3.写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.进配置springmvc.xml

 1 <mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven>
 2     
 3     
 4     <!-- 配置conversionService -->
 5     <!-- 
 6         1.先配置conversionService
 7         2.在 mvc:annotation-driven 标签 添加conversion-service="conversionService"
 8      -->
 9     <bean id="conversionService"
10         class="org.springframework.context.support.ConversionServiceFactoryBean">
11         <property name="converters">
12             <set>
13             <!--employeeConverter EmployeeConverter类的 首字母小写即可  -->
14                 <ref bean="employeeConverter"/>
15             </set>
16         </property>
17     </bean>