SpringMVC 类型转换错误自定义返回

在SpringMVC捕获异常只需要实现接口org.springframework.web.servlet.HandlerExceptionResolver，即可自定义返回异常，如：属性转换异常

    @RequestMapping("/test")
	@ResponseBody
	public String str(Integer age) throws Exception {
		return "test:" + age;
	}

package com.cml.mvc.exception;

import java.io.IOException;
import java.io.Writer;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.TypeMismatchException;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import com.cml.mvc.beans.Result;
import com.google.gson.Gson;

public class MyExceptionHandler implements HandlerExceptionResolver {

	private static Log log = LogFactory.getLog(MyExceptionHandler.class);

	@Override
	public ModelAndView resolveException(HttpServletRequest request,
			HttpServletResponse response, Object handler, Exception ex) {
		log.info("异常捕获=======>" + ex);
		log.info("异常捕获=======>" + handler);

		Result result = new Result();

		// 返回错误信息不为空
		if (ex instanceof TypeMismatchException && null != ex.getMessage()) {
			result.setResult(ex.getMessage());
		} else {
			result.setResult("500 服务器异常！");
		}

		response.setHeader("content-type", "application/json");
		response.setCharacterEncoding("UTF-8");
		try {
			Writer writer = response.getWriter();
			writer.write(new Gson().toJson(result));
			writer.close();
		} catch (IOException e1) {
			e1.printStackTrace();
		}
		return null;
	}

}

设想：如果可以获取到所有类型转换错误信息，那是多perfect啊，研究中。。。。