springboot通用异常处理

需要关注的点:

1. 异常捕获
2. 请求参数回放
3. 统一异常处理

异常捕获

对于控制层controller可以忽略部分异常处理

请求参数回放

因为是在异常发生时serveletrequest已经被拆包一次,所以需要考虑怎么把请求参数保留起来

Servlet提供了Filter可以在请求到达时进行参数处理.

自定义Fliter

import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

@Component
@WebFilter(urlPatterns = "/*",filterName = "customFilter")
public class CustomFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        ServletRequest requestWrapper = null;
        if(servletRequest instanceof HttpServletRequest) {
            requestWrapper = new CustomRequestWrapper((HttpServletRequest) servletRequest);
        }
        if(requestWrapper == null) {
            filterChain.doFilter(servletRequest, servletResponse);
        } else {
            filterChain.doFilter(requestWrapper, servletResponse);
        }
    }

    @Override
    public void destroy() {

    }
}

自定义请求包装类

import com.alibaba.fastjson.JSON;
import org.apache.commons.io.IOUtils;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

public class CustomRequestWrapper extends HttpServletRequestWrapper {
    private String body;
    public CustomRequestWrapper(HttpServletRequest request) {
        super(request);
        try {
            String requestBody = "";
            if ("POST".equals(request.getMethod())){
                if (request.getParameterMap() == null || request.getParameterMap().isEmpty()){
                    requestBody = IOUtils.toString(request.getReader());
                    setBody(requestBody);
                }else{
                    requestBody = JSON.toJSONString(request.getParameterMap());
                    setBody(requestBody);
                }

            }else{
                requestBody = JSON.toJSONString(request.getParameterMap());
                setBody(requestBody);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    public ServletInputStream getInputStream() {
        //String requestBodyStr = getBody();
        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(getBody().getBytes());
        ServletInputStream servletInputStream = new ServletInputStream() {
            @Override
            public boolean isFinished() {
                return false;
            }

            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setReadListener(ReadListener readListener) {

            }

            @Override
            public int read(){
                return byteArrayInputStream.read();
            }
        };
        return servletInputStream;
    }
    @Override
    public BufferedReader getReader() {
        return new BufferedReader(new InputStreamReader(this.getInputStream()));
    }

    public String getBody() {
        return this.body;
    }

    public void setBody(String body) {
        this.body = body;
    }
}

统一异常处理

spring提供了controlleradvice对controller层进行基于异常及非200状态码的切面监控

import org.springframework.ui.Model;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.*;

import java.util.HashMap;
import java.util.Map;

/**
 * controller 增强器
 */
@ControllerAdvice
public class MyControllerAdvice {

    /**
     * 全局异常捕捉处理
     * @param ex
     * @return
     */
    @ResponseBody
    @ExceptionHandler(value = Exception.class)
    public Map errorHandler(Exception ex,WebRequest request) {
        {
      ServletWebRequest servletWebRequest = (ServletWebRequest) request;
      if (servletWebRequest.getRequest().getClass().equals(CustomRequestWrapper.class)){
          CustomRequestWrapper servletRequest = (CustomRequestWrapper) servletWebRequest.getRequest();
          String requestURI = servletRequest.getRequestURI();
          String remoteAddr = servletRequest.getRemoteAddr();
          String method = servletRequest.getMethod();
          String statusCode = status.value() + "";
          String requestBody = servletRequest.getBody();
          String errorMessage = e.getMessage();
          DateTime now = new DateTime();
          String timeLocal = now.toString("yyyy-MM-dd")+"T"+now.toString("HH:mm:ss")+"+08:00";
          //.....此处省略千言万语
       }
        Map map = new HashMap();
        map.put("code", 100);
        map.put("msg", ex.getMessage());
        return map;
    }
}

 

本文地址：https://blog.csdn.net/*nggui10000/article/details/107700219