笔记：springmvc自定义类型转换器和异常处理器

3.自定义类型转换器开发及配置。

java转换器代码：

public class MyStringToDateConverter implements Converter<String, Date> {
     
    @Override
    public Date convert(String s) {
     
        if (s==null) {
     
            throw new RuntimeException("请您传入数据");
        }
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
        SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy/mm/dd");
        try {
     
            if (s.charAt(4) == '-') {
     
                return sdf.parse(s);
            } else {
     
                return sdf2.parse(s);
            }
        } catch (Exception e) {
     
            throw new RuntimeException("数据格式有误！！！");
        }
    }
}

配置自定义类型转换器：

    
    <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
        <property name="converters">
            <set>
                <bean class="com.lz.utils.MyStringToDateConverter"/>
            set>
        property>
    bean>

   
    <mvc:annotation-driven enable-matrix-variables="true" conversion-service="conversionService">
        <mvc:async-support default-timeout="10"/>
    mvc:annotation-driven>

9.自定义异常处理器

1.自定义异常

/**
 * 自定义异常
 * @author lz先生
 */
public class MyException extends Exception {
     
    private String message;

    @Override
    public String getMessage() {
     
        return message;
    }

    public void setMessage(String message) {
     
        this.message = message;
    }

    public MyException(String message) {
     
        this.message = message;
    }
}

2.异常处理

/**
 * 异常处理跳转到自定义myError页面
 * @author lz先生
 */
public class MyExceptionResolver implements HandlerExceptionResolver {
     

    /**
     * 异常处理器
     * @param request
     * @param response
     * @param o
     * @param e
     * @return
     */
    @Override
    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object o, Exception e) {
     
        /*获取异常*/
        MyException myException = null;
        if (e instanceof MyException) {
     
            myException = (MyException) e;
        } else {
     
            myException = new MyException("系统正在维护...");
        }
        ModelAndView view = new ModelAndView();
        view.addObject("errorMsg", myException.getMessage());
        view.setViewName("myError");
        return view;
    }
}

3.配置自定义异常处理器

    
    <bean id="myExceptionResolver" class="com.lz.exception.MyExceptionResolver"/>

4.异常模拟

    /**
     * 模拟异常
     * @return
     * @throws Exception
     */
    @RequestMapping("/testException")
    public String testException() throws Exception {
     
        System.out.println("testException执行了....");

        try {
     
            /*模拟异常*/
            int a = 10 / 0;
        } catch (Exception e) {
     
            e.printStackTrace();
            throw new MyException("模拟异常出错");
        }
        return "good";
    }