学习SpringMVC(十七)之自定义类型转换器

Posted 2020-07-11 奔跑着的国风

本节的主要内容就是将表单提交的字符串转化为对象

在index.jsp中：

<span style="font-size:18px;"><h2>SpringMVC 自定义转换器</h2>
  <form action="springmvc/testConversion">
  Employee:<input type="text" name="employee">
  <input type="submit" value="提交">
  </form></span>

在Controller中：

<span style="font-family:SimSun;font-size:18px;">package com.cgf.springmvc.handlers;
import java.util.Map;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import com.cgf.springmvc.crud.dao.EmployeeDao;
import com.cgf.springmvc.crud.entities.Employee;

@RequestMapping(value="/springmvc")
@Controller
public class MyConversion {	
	@Autowired
	private EmployeeDao employeeDao;
	
	@RequestMapping(value="/testConversion")
	public String testConversion(@RequestParam(value="employee")Employee employee,
			Map<String,Object> map){
		employeeDao.save(employee);
		//map.put("emplists", employeeDao.getAll());
		return "redirect:list";
	}

}</span>

之后要自定义一个类型转换器，该类要实现Converter接口

package com.cgf.springmvc.conversion;
import org.springframework.core.convert.converter.Converter;
import org.springframework.stereotype.Component;
import com.cgf.springmvc.crud.entities.Department;
import com.cgf.springmvc.crud.entities.Employee;

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

	public Employee convert(String source) {
		// TODO Auto-generated method stub
		//[email protected]
		if(source!=null){
			String []args=source.split("-");
			if(args!=null&&args.length==4){
			String lastName=args[0];
			String email=args[1];
			int gender=Integer.parseInt(args[2]);
			Department department=new Department();
			department.setId(Integer.parseInt(args[3]));
			Employee e=new Employee(null, lastName, email, gender, department);
			System.out.println(source+"--conversion--"+e);
			return e;
		}
	}
		return null;
  }
}

最后要在springmvc.xml中配置一个ConversionServiceFactoryBean

<bean name="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
<property name="converters">
<set>
	<ref bean="myConversionService"></ref>
</set>
</property>

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