spring mvc controller中的异常封装

http://abc08010051.iteye.com/blog/2031992

一直以来都在用spring mvc做mvc框架，我使用的不是基于注解的，还是使用的基于xml的，在controller里一般都会加上一个异常捕捉，能分析出来的异常，提示出具体信息，不能预料的异常，返回一个统一的异常提示信息，未封装前的代码为：

public ModelAndView addBigDeal(HttpServletRequest request, HttpServletResponse response) throws Exception {
JSONObject jsonObject = new JSONObject();
try {
String sessionId = WebUtils.getStringValue(request, "sessionId", true);
String pl_id = WebUtils.getStringValue(request, "pl_id", true);
String vsr_id = WebUtils.getStringValue(request, "vsr_id", true);
String cmnts = WebUtils.getStringValue(request, "cmnts", false);
if (!StringUtils.isBlank(cmnts)) {
cmnts = new String(Base64Utils.decode(cmnts), "UTF-8");
}
JSONObject result = new JSONObject();
result.put("dataId", this.storeVsrService.addBigDeal(pl_id, vsr_id, cmnts));
jsonObject.put("data", result);
jsonObject.put("status", CommonUtils.getSubStatus(" add bigDeal successfully!"));
} catch (GenericException e) {
jsonObject.put("status", CommonUtils.getSubStatus(false, "000001", e.getMsg()));
jsonObject.put("data", "");
logger.error("error !", e);
} catch (Exception e) {
jsonObject.put("status", CommonUtils.getSubStatus(false, "000001", "网络或其他错误，请联系管理员！"));
jsonObject.put("data", "");
logger.error("error !", e);
}
response.getWriter().write(jsonObject.toString());
return null;
}

GenericException为自定义异常的父类，自定义的异常都要继承该类

上面代码的缺点：每写一个方法时，都要重复的写这一段：

try {
} catch (GenericException e) {
jsonObject.put("status", CommonUtils.getSubStatus(false, "000001", e.getMsg()));
jsonObject.put("data", "");
logger.error("error !", e);
} catch (Exception e) {
jsonObject.put("status", CommonUtils.getSubStatus(false, "000001", "网络或其他错误，请联系管理员！"));
jsonObject.put("data", "");
logger.error("error !", e);
}

因为每一个controller都会继承MultiActionController，现在在每一个controller和自己定义的controller里抽象一层，因为所有controller里的方法入口

都是MultiActionController里的handleRequestInternal方法，所以重写该方法，把异常捕捉放到这个统一的入口和出口里，

新增加的类为BaseController，封装后的代码如下：

package com.intel.store.controller;
import com.intel.store.common.CommonUtils;
import com.intel.store.exception.GenericException;
import org.codehaus.jettison.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;
import org.springframework.web.servlet.mvc.multiaction.NoSuchRequestHandlingMethodException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* mvc controller类的基类，用于一般controller的继承，
* 把异常控制模块提取到基类，
* 使开发更加简洁，快速
* Created with IntelliJ IDEA.
* User: malone
* Date: 14-3-17
* Time: 上午10:21
* To change this template use File | Settings | File Templates.
*/
public class BaseController<T extends BaseController<T>> extends MultiActionController {
private Class<T> subclass;
private Logger logger = LoggerFactory.getLogger(subclass);
BaseController() {
subclass = ((Class)((ParameterizedType)(this.getClass().getGenericSuperclass())).getActualTypeArguments()[0]);
logger = LoggerFactory.getLogger(subclass);
}
@Override
protected ModelAndView handleRequestInternal(HttpServletRequest request, HttpServletResponse response)
throws Exception {
JSONObject jsonObject = new JSONObject();
try {
String methodName = this.getMethodNameResolver().getHandlerMethodName(request);
Object obj = invokeNamedMethod(methodName, request, response);
System.out.println(obj.getClass());
return invokeNamedMethod(methodName, request, response);
} catch (NoSuchRequestHandlingMethodException ex) {
return handleNoSuchRequestHandlingMethod(ex, request, response);
} catch (GenericException e) {
jsonObject.put("status", CommonUtils.getSubStatus(false, "000001", e.getMsg()));
jsonObject.put("data", "");
logger.error(e.getMsg(), e);
response.getWriter().write(jsonObject.toString());
return null;
} catch (Exception e) {
jsonObject.put("status", CommonUtils.getSubStatus(false, "000001",
"网络或其他错误，请联系管理员！"));
jsonObject.put("data", "");
logger.error("error !", e);
response.getWriter().write(jsonObject.toString());
return null;
}
}
}

这样以来所有的自定义Controller只需要继承BaseController，然后在每个方法里就需要些try catch异常捕捉模块了，如下所示

public ModelAndView addBigDeal(HttpServletRequest request, HttpServletResponse response) throws Exception {
JSONObject jsonObject = new JSONObject();
String sessionId = WebUtils.getStringValue(request, "sessionId", true);
String pl_id = WebUtils.getStringValue(request, "pl_id", true);
String vsr_id = WebUtils.getStringValue(request, "vsr_id", true);
String cmnts = WebUtils.getStringValue(request, "cmnts", false);
if (!StringUtils.isBlank(cmnts)) {
cmnts = new String(Base64Utils.decode(cmnts), "UTF-8");
}
JSONObject result = new JSONObject();
result.put("dataId", this.storeVsrService.addBigDeal(pl_id, vsr_id, cmnts));
jsonObject.put("data", result);
jsonObject.put("status", CommonUtils.getSubStatus(" add bigDeal successfully!"));
response.getWriter().write(jsonObject.toString());
return null;
}

巴特西

spring mvc controller中的异常封装

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