spring @ExceptionHandler注解方式实现异常统一处理

   首先，在我们的工程中新建BaseController父类，内容如下：

import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.log4j.Logger;
import org.springframework.web.bind.annotation.ExceptionHandler;

/**
* 2015-11-06
*
* @author djw 统一异常处理，所有controler继承此类
*/
public abstract class BaseController {
@ExceptionHandler
public String handleException(HttpServletRequest request,
HttpServletResponse response, Exception e) {

printException(e);// log4j打印错误级别堆栈日志信息，时间
// json格式的ajax请求
if (request.getHeader("accept").indexOf("application/json") > -1
|| (request.getHeader("X-Requested-With") != null && request
.getHeader("X-Requested-With")
.indexOf("XMLHttpRequest") > -1)) {
response.setStatus(500);
response.setContentType("application/json;charset=utf-8");
try {
PrintWriter writer = response.getWriter();
if (e instanceof RuntimeException) {// 运行时异常
writer.write("系统内部异常！");
} else {// 非运行时异常
writer.write(e.getMessage());// 此处待细化异常处理给提示 ？？？
}
writer.flush();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
return null;
} else {// URL普通请求
if (e instanceof RuntimeException) {// 运行时异常
request.setAttribute("exceptionMessage", "系统内部异常！");
} else {
request.setAttribute("exceptionMessage", e.getMessage());// 此处待细化异常处理给显示 ？？？
}
try {// 跳转统一异常处理界面
request.getRequestDispatcher("../error.jsp").forward(
request, response);
} catch (ServletException | IOException e1) {
e1.printStackTrace();
}
return null;
}
}

public void printException(Exception e) {
StringWriter sw = null;
PrintWriter pw = null;
try {
sw = new StringWriter();
pw = new PrintWriter(sw);
// 将出错的栈信息输出到printWriter中
e.printStackTrace(pw);
pw.flush();
sw.flush();
} finally {
if (sw != null) {
try {
sw.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
if (pw != null) {
pw.close();
}
}
Logger.getLogger(BaseController.class).error(
new Date() + ":" + sw.toString());
}

}

所有controler类继承此类实现异常统一处理；